CN104609814B - Anti-aqueous dispersion synchronous grouting material with large specific gravity and low consistence - Google Patents

Abstract

The invention discloses an anti-aqueous dispersion synchronous grouting material with large specific gravity and low consistence. The anti-aqueous dispersion synchronous grouting material consists of the following components in parts by weight: 100 parts of coal ash, 10-30 parts of slaked lime, 5-20 parts of cement, 10-50 parts of phosphorus gypsum, 0-200 parts of machine-made sand, 200-400 parts of shield mud and sand, 0.1-0.5 part of a water reducing agent, 0.05-0.2 part of a thickening agent and 80-120 parts of water. The shield mud and sand is used for replacing river sand and bentonite in a traditional grouting material, and the shield mud and sand and machine-made sand are taken as fine aggregates, so that the problem of resource shortage for natural sand is solved; moreover, the coal ash discharged at a power station and the phosphorus gypsum produced at a phosphorus chemical plant are reasonably utilized, so that the resource utilization of industrial waste is realized. The grouting material has the characteristics of good filling property, long castable time, large specific gravity, low consistence, anti-aqueous dispersion performance, segment floating prevention and the like, is prominent in environmental protection performance and low in cost, and can be widely applied to the shield segment grouting engineering and the like.

Description

A high specific gravity and low consistency water dispersion resistant synchronous grouting material

technical field

The invention belongs to the field of building materials, in particular to a large specific gravity and low consistency water-resistant dispersion synchronous grouting material and a preparation method thereof.

Background technique

Synchronous grouting is an important process in tunnel shield construction. It plays the role of "controlling the uplift of tunnel segments, reducing ground subsidence, and ensuring structural stability". It is an indispensable link in tunnel excavation. However, ordinary synchronous grouting materials are not easy to fill evenly around the segment, have poor water dispersion resistance, and are easy to segregate and delaminate under high-pressure water-rich conditions, which affect the injectability, strength and durability of the slurry, and are easy to flow. To the bottom of the segment, the vault of the segment is filled and floated up, and the surface settlement cannot be effectively controlled.

During the excavation process of tunnel shield construction, a large amount of sediment is excavated (shield excavation cuts sand). The excavation of sandy soil by shield tunneling not only occupies the construction site and is difficult to handle, but also directly affects the construction progress, which has become a major burden on tunnel construction and environmental protection. How to rationally utilize the sand and soil excavated by shield tunneling will become the focus of future tunnel construction. In recent years, in response to the needs of various infrastructures and the increasing scale of construction, the demand for concrete and mortar has increased sharply, and the amount of sand and gravel aggregates, which account for about 70% of the volume, has continued to grow. The existing natural sand resources are difficult to guarantee my country's infrastructure. building. The natural sand resources in many areas are almost exhausted, and the mining of natural sand has been banned or restricted in many places. The contradiction between the supply and demand of engineering sand is becoming more and more prominent. In some areas, there is even no natural sand available, which directly affects the progress of the project. The emergence of machine-made sand can not only solve the problem of river sand shortage, reduce the cost of the project, but also realize its mechanized production, and control various technical indicators within the ideal range. Therefore, the quality of machine-made sand is easier to control than natural sand. Therefore, the research and application of machine-made sand to replace river sand has become more and more important.

In addition, the amount of industrial waste such as phosphogypsum and fly ash discharged in my country ranks first in the world every year. These wastes not only occupy space and are difficult to handle, but also easily cause pollution to the atmosphere, groundwater and soil environment. The treatment of these industrial wastes It has always been a key issue that scholars have been working hard to solve.

Contents of the invention

The purpose of the present invention is to provide a synchronous grouting material with large specific gravity and low consistency, which is resistant to water dispersion and has the characteristics of high density, low consistency value, resistance to water dispersion and prevention of segment floating, and the preparation method involved is simple and can be Effectively solve the shortage of traditional river sand resources and the recycling and utilization of fly ash, phosphogypsum and other industrial waste residues.

To achieve the above object, the technical solution adopted in the present invention is:

A synchronous grouting material with large specific gravity and low consistency and water resistance, which is composed of the following components in parts by weight: 100 parts of fly ash, 10-50 parts of phosphogypsum, 5-20 parts of cement, 10-30 parts of slaked lime, 200-400 parts of shield mud and sand, 0-200 parts of machine-made sand, 0.1-0.5 parts of water reducing agent, 0.05-0.2 parts of thickener, and 80-120 parts of water.

In the above scheme, the parts by weight of each component are: 100 parts of fly ash, 20-40 parts of phosphogypsum, 5-10 parts of cement, 15-30 parts of slaked lime, 200-400 parts of shield mud sand, 100-200 parts of machine-made sand 0.1-0.3 parts of water reducer, 0.1-0.2 parts of thickener, 90-120 parts of water.

In the above solution, the fly ash is Class II ash, and its Blaine specific surface area is greater than 350m ² /kg.

In the above scheme, the phosphogypsum is the waste residue discharged from the phosphating plant, its purity is not less than 95wt%, the SO3 content is _35-40wt %, the _P2O5 content is less than _2.14wt %, and its Blaine specific surface area is greater ^than 350m2 /kg.

In the above solution, the cement is P.O42.5 ordinary Portland cement, and its Blaine specific surface area is greater than 350m ² /kg.

In the above scheme, the determination method of the Blaine specific surface area is carried out according to GB/T 8074-2008 "Method for Determination of Cement Specific Surface Area Blaine Method".

In the above scheme, the slaked lime is an industrial-grade white powder with a purity greater than 98%.

In the above solution, the shield mud sand has a mud content of 5-20 wt%, a sand content of >70 wt%, and a fineness modulus of 1.6-2.3.

In the above solution, the machine-made sand is crushed river pebble, the stone powder content is less than 4%, the fineness modulus is 2.3-3.0, and the apparent density is greater than 2650kg/m ³ .

In the above scheme, the water reducer is VIVID-500 (C) anti-mud type polycarboxylate high-efficiency water reducer, and its water reducing rate is >20%.

In the above scheme, the thickener is hydroxyethyl cellulose (HEC) or hydroxypropyl methyl cellulose (HPMC), and its molecular weight is not less than 100,000.

The above-mentioned method for preparing a large specific gravity and low consistency water-resistant and dispersed synchronous grouting material, the synchronous grouting material is composed of the following components in parts by weight: 100 parts of fly ash, 10-50 parts of phosphogypsum, 5-50 parts of cement 20 parts, hydrated lime 10-30 parts, shield mud sand 200-400 parts, machine-made sand 0-200 parts, water reducing agent 0.1-0.5 parts, thickener 0.05-0.2 parts, water 80-120 parts, the preparation method includes The following steps:

1) taking raw materials by weight ratio of each component;

2) Mix and stir the weighed slaked lime, fly ash, phosphogypsum, cement, machine-made sand and thickener evenly, then add shield mud and sand, and dry mix together for 1 to 2 minutes to obtain a dry mixture;

3) Add the water reducer to the water and stir evenly, then add it to the dry mixture obtained in step (2), and mix and stir for 2 to 3 minutes to obtain the high specific gravity, low consistency, water resistance, dispersion and environmental protection synchronous grouting material .

In the above scheme, the shield mud and sand need to be tested for moisture content before use, and then dried to measure the mud content and sand content; during the preparation process, the addition in the mix ratio needs to be adjusted according to the water content of the mud and sand. water volume.

According to the above scheme, the prepared synchronous grouting material with large specific gravity, low consistency, water resistance and dispersion environment-friendly has a slump > 20 mm, a fluidity > 200 mm, a consistency < 11 cm, a bleeding rate < 0.5%, and a density > 2.0 g/cm ³ , 7d compressive strength ≥ 1MPa, 28d strength ≥ 1.5MPa, 28d water-land strength ratio ≥ 0.90, can effectively resist water dispersion and prevent segments from floating up, and meet the performance requirements of shield tunneling for slurry.

Principle of the present invention is:

1) The hydration process of the cementitious material in the large specific gravity, low consistency, water-resistant, dispersion-resistant and environmentally friendly synchronous grouting material is as follows: after the cement encounters water, a hydration reaction occurs to generate CSH gel, Ca(OH) ₂ , etc., cement and Slaked lime provides OH ^- together; while the main component of phosphogypsum is undisturbed dihydrate gypsum, which can provide SO ₄ ^2- ; under the excitation of OH ^- and SO ₄ ^2- , the active alumina and silica in fly ash disintegrate, The Si-O bond and the Al-O bond are broken to form ettringite and active precursors, and the reaction equation is:

CaO+Al ₂ O ₃ +3(CaSO ₄ 2H ₂ O)+2Ca(OH) ₂ +24H ₂ O→

3CaO Al ₂ O ₃ 3CaSO ₄ 32H ₂ O

³⁺ Si-O-Si ³⁺ +6OH ^- → 2[SiO(OH) ₃ ] ^-

³⁺ Al-O-Al ³⁺ +8OH ^- → 2[Al(OH) ₄ ] ^-

³⁺ Si-O-Al ³⁺ +7OH ^- →[SiO(OH) ₃ ] ^- +[Al(OH) ₄ ] ^-

After deconstruction, [SiO(OH) ₃ ] ^- and [Al(OH) ₄ ] ^- will continue to increase, and react with free Ca ²⁺ in the slurry to form calcium silicate hydrate, calcium aluminate hydrate and three-dimensional silicon Hydration product of aluminum structure. The hydration products in the gelled material are continuously interwoven and aggregated to form a tight and disordered network structure. During the formation of the network structure, the phenomenon of Al ³⁺ replacing ^{Si 4+} will appear, so that the surroundings of the aluminum ^ions will be negatively charged ^. Sexual ions will be filled in the channels of the gel, so as to obtain a relatively stable gel structure and generate a zeolite-like substance (Na, Ca)-Si-Al-H with good water erosion resistance; in ettringite, Under the action of the skeleton of the zeolite structure and the adhesive filling action of CSH, CASH, etc., a hardened slurry with a dense structure is finally formed.

2) The principle of using shield mud sand to replace river sand and bentonite in traditional grouting materials is as follows:

The main components of shield mud and sand are fine sand and argillaceous clay. The mud and sand used in the experiment have a mud content of 5-20wt%, a sand content of more than 70wt%, and a fineness modulus of 1.6-2.3. The greater the content of muddy components in the shield mud sand, the better the water absorption and swelling, which can reduce the amount of free water, increase the viscosity, and reduce the fluidity. At the same time, it has a columnar structure, and the surface contains a large number of active groups ("OH" and "Si-O"), which has water absorption, thixotropy, expansion, etc. After being incorporated, the viscosity of the slurry increases, hindering Particles sink, and after hydrolysis, they will form a card house structure, so that a large amount of free water will be transformed into bound water in the card house structure, thereby improving cohesion, water retention and stability, and preventing the occurrence of pump and pipe plugging. The fineness modulus of the sandy component in the shield mud sand is 1.6-2.3, and the average particle size is about 0.3mm, which can be compared with the fine sand in the machine-made sand, and is very suitable for fine aggregate in synchronous grouting materials . It can be concluded that the clay component in the shield mud sand has the effect of bentonite, and the sand quality is the same as the fine sand in ordinary river sand, so the machine-made sand and bentonite in traditional synchronous grouting materials can be replaced by shield mud sand.

3) The mechanism of anti-water dispersion is as follows:

The thickener hydroxyethyl cellulose ether (HEC) or hydroxypropyl methyl cellulose (HPMC) is a water-soluble polymer compound with a long chain structure and strong adsorption capacity. It can adsorb cement, fly ash, phosphogypsum particles and fine aggregates together, and improve the cohesion between the particles of synchronous grouting materials; and the hydroxyl on the long chain and the oxygen atom on the ether bond associate with water molecules Hydrogen bonds are formed, and part of the free water is no longer "free", resulting in thickening of the solution; at the same time, the molecular chains of cellulose ether will be entangled with each other to form a three-dimensional network structure, thereby greatly improving the viscosity and water washing resistance of synchronous grouting materials. The encapsulation and homogeneity of the slurry can improve its ability to resist mortar-sand separation and bleeding and segregation; in addition, the surface of shield mud-sand contains a large number of active groups, which have water absorption, thixotropy, and swelling properties, and can be used with thickeners The polymer long chains are interlinked and interpenetrated to further improve the water dispersion resistance and stability of the slurry, and the stone powder in the machine-made sand also has the effect of absorbing water and increasing the viscosity of the mud component in the shield mud sand, so the slurry can In the environment of high pressure and rich water, the gap between the segment and the soil layer is densely and evenly filled without separation of water glue and glue sand.

4) The mechanism of preventing the segments from floating up is as follows:

Since the grouting material mainly plays the role of filling the void, preventing ground subsidence and making the segment uniformly stressed, the requirements for its strength are not high. In order to save costs and prolong the usable time of the slurry, generally the amount of cementitious materials, especially cement, is less, and the setting time of the slurry is longer than 20 hours. In this study, by controlling the consistency and fluidity, the grouting material injected from the grouting hole is prevented from flowing to the bottom of the segment under the action of gravity, forming a large buoyancy and causing the segment to float up; Strong cohesion, cementing material, cementing material and fine aggregate, fine aggregate have obvious friction effect, so that the slurry has a large shear yield strength, can resist a certain degree of deformation, and further improve the hardening of the slurry The ability to prevent the segment from floating up. Subsequently, the cement, slaked lime, fly ash and phosphogypsum system hydrated and hardened to produce strength, and the deformation resistance was improved again, further preventing the tunnel segment from floating.

In addition, in order to ensure that the grouting material still has good injectability and properly increase its strength under the condition of large specific gravity and low consistency, the present invention mixes an appropriate amount of mud-resistant polycarboxylate high-efficiency water-reducing material into the grouting material. This kind of water reducer can effectively overcome the shortcomings of ordinary water reducers that are susceptible to mud adsorption and weaken the water reducing performance, and can improve the working performance of the slurry. When the silt content of the shield machine used is small, the amount of thickener can be appropriately increased and the amount of water can be reduced to ensure low consistency; but when the silt content is large, the amount of shield machine silt can be reduced and increased. The amount of machine-made sand is used to increase the friction and shear resistance between sand particles, so that the slurry has sufficient shear yield strength to resist deformation before hardening.

Compared with prior art, the beneficial effect of the present invention is:

1) The present invention selects the shield mud sand index parameter range suitable for preparing synchronous grouting materials by studying parameters such as shield mud sand moisture content, mud content and sand content; and rationally uses shield mud sand and machine-made sand as Fine aggregate, by adjusting the ratio of fly ash, slaked lime, phosphogypsum and cement to control the setting time and strength of the slurry after molding; by adjusting the ratio of mortar to sand and mud-sand machine-made sand ratio to control the sand content, density and consistency of the slurry and shear yield strength, so that the slurry can resist a certain degree of deformation depending on the viscosity and shear resistance of the slurry itself before hardening; The dosage of the agent is used to further control the working performance, consistency and strength of the slurry, so that the slurry has good injectability, water dispersion resistance, impermeability, water corrosion resistance and the ability to prevent the segment from floating, thus Adapt to the performance requirements of slurry under different construction conditions.

2) The synchronous grouting material according to the present invention has a large specificity: the density can reach 2.06g/cm ³ ; the consistency is low: the consistency value is less than 11cm; 20h; low bleeding rate: bleeding rate <0.5%; excellent water dispersion resistance: 28d water and land strength ratio >90%; 7d compressive strength > 1MPa, 28d compressive strength > 1.5MPa, which can effectively prevent segment Float up to meet the performance requirements of shield tunneling for grouting materials.

3) The large specific gravity, low consistency, water-resistant and dispersed synchronous grouting material of the present invention, the mixing amount of fly ash and phosphogypsum in the cementitious component is greater than 70wt%, and shield mud sand and machine-made sand are used as fine aggregates It can effectively solve the problem of shortage of traditional river sand resources. Due to the rational use of the fly ash discharged from the power plant and the phosphogypsum produced in the production process of the phosphating plant, the resource utilization of industrial waste has been realized, and the use of mud sand and machine-made sand excavated during shield tunneling construction has been reduced The dredging and mining of river sand meets the requirements of the sustainable development strategy.

4) The preparation method involved in the present invention is simple, the raw materials are simple and easy to obtain, the prepared grouting material has excellent comprehensive performance, outstanding environmental protection performance, low cost, can well meet the requirements of on-site construction, and has significant economic and social benefits .

detailed description

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the following examples, the fly ash is grade II ash, and Blaine's specific surface area is greater than 350m ² /kg;

The phosphogypsum is the waste residue discharged from the phosphating plant, its purity is not less than 95wt%, the SO3 content is _37.5wt %, the _P2O5 content is less than _2.14wt %, and its Blaine specific surface area is greater ^than 350m2/kg;

The cement is P.O42.5 ordinary Portland cement, and its Blaine specific surface area is greater than 350m ² /kg;

Described slaked lime is technical grade white powder, and purity is greater than 95%;

The machine-made sand is a river pebble crushing type, the stone powder content is 3.4%, its fineness modulus is 2.8, and the apparent density is 2718kg/m ³ ;

The described water reducer is VIVID-500 (C) anti-mud type polycarboxylate high-efficiency water reducer.

The preparation method of the described large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material comprises the following steps: 1) weighing each raw material according to the ratio of raw materials; 2) weighing hydrated lime, fly ash, phosphogypsum, Add cement, machine-made sand and thickener to the mixer and mix evenly, then add shield mud and sand, and dry mix together for 2 minutes to obtain a dry mix; 3) Add water reducer to water and mix well, then add them to the dry mix together , mixed and stirred for 3 minutes to obtain the high specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material, and the obtained grouting material should be continuously stirred during storage and ready for use at any time.

The performance testing method of the large specific gravity and low consistency anti-water dispersion synchronous grouting material that following embodiment makes is as follows:

1) Determination of mechanical properties: the compressive strength shall be carried out according to GB177-85 "Cement Mortar Strength Test Method";

2) Test of fluidity performance: The fluidity test method is carried out according to GB/T_2419-2005 "Measurement of Fluidity of Cement Mortar Sand", and the slump is the height loss measured after the slurry is inserted into the mold and lifted vertically;

3) Test of bleeding rate: The measurement of bleeding rate shall be carried out with reference to GB/T3183-1997 "Masonry Cement";

4) Density test: measure the mass m ₁ of a fixed-volume glass, measure the total weight m ₂ after filling the slurry, and divide the mass of the slurry (m ₂ -m ₁ ) by the volume of the glass to obtain the slurry Density;

5) Test of consistency and setting time: according to JGJ70-90 "Basic Performance Test Methods of Construction Grout";

6) Test of water dispersion resistance: refer to DL/T5177-2000 "Experimental Regulations for Underwater Non-dispersible Concrete".

Example 1

A water-resistant dispersion synchronous grouting material with large specific gravity and low consistency, which consists of the following components in parts by weight:

100 parts of fly ash, 40 parts of phosphogypsum, 5 parts of cement, 20 parts of slaked lime, 300 parts of shield mud sand, 100 parts of machine-made sand, 0.2 parts of water reducer, 0.1 part of thickener, and 110 parts of water.

The shield silt has a water content of 4.6%, a mud content of 12.6wt%, a sand content of 86.2wt%, and a fineness modulus of 1.8; the thickener is hydroxypropyl methylcellulose (HPMC) , and its molecular weight is 200,000.

Table 1 shows the raw material ratio of the large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material described in this example, and the performance test results are shown in Table 2.

Example 2

A water-resistant dispersion synchronous grouting material with large specific gravity and low consistency, which consists of the following components in parts by weight:

100 parts of fly ash, 35 parts of phosphogypsum, 20 parts of cement, 10 parts of slaked lime, 400 parts of shield mud sand, 0 parts of machine-made sand, 0.5 parts of water reducer, 0.05 parts of thickener, and 110 parts of water.

The slaked lime is industrial-grade white powder with a purity greater than 98%. The shield silt has a water content of 4.6%, a mud content of 12.6wt%, a sand content of 86.2wt%, and a fineness modulus of 1.8; the thickener is hydroxypropyl methylcellulose (HPMC) , and its molecular weight is 200,000.

Table 1 shows the raw material ratio of the large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material described in this example, and the performance test results are shown in Table 2.

Example 3

A water-resistant dispersion synchronous grouting material with large specific gravity and low consistency, which consists of the following components in parts by weight:

100 parts of fly ash, 50 parts of phosphogypsum, 5 parts of cement, 10 parts of hydrated lime, 200 parts of shield mud sand, 200 parts of machine-made sand, 0.2 parts of water reducer, 0.1 part of thickener, and 100 parts of water.

The shield silt has a water content of 5.3%, a mud content of 20wt%, a sand content of 79.1wt%, and a fineness modulus of 1.6; the thickener is hydroxypropyl methylcellulose (HPMC), Its molecular weight is 200,000.

Table 1 shows the raw material ratio of the large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material described in this example, and the performance test results are shown in Table 2.

Example 4

A water-resistant dispersion synchronous grouting material with large specific gravity and low consistency, which consists of the following components in parts by weight:

100 parts of fly ash, 10 parts of phosphogypsum, 15 parts of cement, 30 parts of slaked lime, 200 parts of shield mud sand, 200 parts of machine-made sand, 0.2 parts of water reducer, 0.1 part of thickener, and 100 parts of water.

The shield mud sand has a water content of 5.3%, a mud content of 20wt%, a sand content of 79.1wt%, and a fineness modulus of 1.6; the thickener is hydroxyethyl cellulose (HEC), and its molecular weight is 100,000.

Table 1 shows the raw material ratio of the large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material described in this example, and the performance test results are shown in Table 2.

Example 5

A water-resistant dispersion synchronous grouting material with large specific gravity and low consistency, which consists of the following components in parts by weight:

100 parts of fly ash, 20 parts of phosphogypsum, 10 parts of cement, 30 parts of slaked lime, 400 parts of shield mud sand, 0 parts of machine-made sand, 0.5 parts of water reducer, 0.05 parts of thickener, and 80 parts of water.

The shield silt has a water content of 4.2%, a mud content of 5 wt%, a sand content of 93.6 wt%, and a fineness modulus of 1.9; the thickener is hydroxyethyl cellulose (HEC), and its molecular weight 200,000.

Table 1 shows the raw material ratio of the large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material described in this example, and the performance test results are shown in Table 2.

Example 6

A water-resistant dispersion synchronous grouting material with large specific gravity and low consistency, which consists of the following components in parts by weight:

100 parts of fly ash, 30 parts of phosphogypsum, 15 parts of cement, 20 parts of slaked lime, 300 parts of shield mud sand, 100 parts of machine-made sand, 0.1 part of water reducer, 0.2 part of thickener, and 120 parts of water.

The shield silt has a water content of 4.8%, a mud content of 15.7wt%, a sand content of 83.2wt%, and a fineness modulus of 1.8; the thickener is hydroxypropyl methylcellulose (HPMC) , and its molecular weight is 100,000.

Table 1 shows the raw material ratio of the large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material described in this example, and the performance test results are shown in Table 2.

Example 7

A water-resistant dispersion synchronous grouting material with large specific gravity and low consistency, which consists of the following components in parts by weight:

100 parts of fly ash, 30 parts of phosphogypsum, 10 parts of cement, 20 parts of slaked lime, 300 parts of shield mud sand, 100 parts of machine-made sand, 0.3 parts of water reducer, 0.2 parts of thickener, and 90 parts of water.

The shield silt has a water content of 4.4%, a mud content of 8.5wt%, a sand content of 90.2wt%, and a fineness modulus of 1.9; the thickener is hydroxypropyl methylcellulose (HPMC) , and its molecular weight is 100,000.

Table 1 shows the raw material ratio of the large specific gravity, low consistency, water-resistant and dispersible environment-friendly synchronous grouting material described in this example, and the performance test results are shown in Table 2.

Table 1 Raw material ratio (parts by weight) of the synchronous grouting material described in Examples 1 to 7

Table 2 Performance test results of synchronous grouting materials described in Examples 1 to 7

Table 2 shows that the synchronous grouting material prepared by the method of the present invention has the characteristics of large specific gravity, low consistency, good fluidity, long usable time, and water dispersion resistance. The obtained synchronous grouting material can well prevent the grouting tunnel segment from floating up, reduce ground subsidence, waterproof, make the tunnel segment uniformly stressed, and ensure structural stability.

The upper and lower limits and interval values of the raw materials used in the present invention can realize the present invention, so examples are not enumerated one by one here again. And the above-mentioned embodiments are only examples made for clear illustration, and are not intended to limit the implementation. For those skilled in the art, on the basis of the above description, other changes or changes in different forms can also be made, and these changes or changes are still within the protection scope of the present invention.

Claims (6)

1. a big proportion low denseness water resistant dispersion synchronous grouting material, is made up of the component of following parts by weight: flyash 100 Part, ardealite 10～50 parts, cement 5～20 parts, Calx 10～30 parts, shield silt particle 200～400 parts, Machine-made Sand 0～ 200 parts, water reducer 0.1～0.5 part, thickening agent 0.05～0.2 part, water 80～120 parts；

Described shield silt particle clay content is 5～20wt%, sand content ＞ 70wt%, and modulus of fineness is 1.6～2.3；

Described Machine-made Sand is cobble breaking type, and content of stone powder is less than 4%, and its modulus of fineness is 2.3～3.0, and apparent density is big In 2650kg/m³；

Described water reducer is anti-chamotte mould polycarboxylic acid series high efficiency water reducing agent, its water-reducing rate > 20%.

Synchronous grouting material the most according to claim 1, it is characterised in that described flyash is II level ash, and its Bo Shi compares table Area is more than 350m²/kg。

Synchronous grouting material the most according to claim 1, it is characterised in that described ardealite is the waste residue that phosphatization workshop is discharged, SO₃Content is 35～40wt%, P₂O₅Content is less than 2.14wt%, and its Blain specific surface is more than 350m²/kg。

Synchronous grouting material the most according to claim 1, it is characterised in that described cement is 42.5 grades of Portland cements, Its Blain specific surface is more than 350m²/kg；Described Calx is technical grade white powder, and purity is more than 95%.

Synchronous grouting material the most according to claim 1, it is characterised in that described thickening agent is hydroxyethyl cellulose or hydroxyl Propyl methocel, its molecular weight is not less than 100,000.

6. disperse the preparation method of synchronous grouting material according to the big proportion low denseness water resistant described in any one of Claims 1 to 5, it is special Levying and be, described synchronous grouting material is made up of the component of following parts by weight: 100 parts of flyash, ardealite 10～50 parts, Cement 5～20 parts, Calx 10～30 parts, shield silt particle 200～400 parts, Machine-made Sand 0～200 parts, water reducer 0.1～ 0.5 part, thickening agent 0.05～0.2 part, water 80～120 parts, its preparation method comprises the following steps:

1) raw material is weighed by the weight proportion of each component；

2) by load weighted Calx, flyash, ardealite, cement, Machine-made Sand and thickening agent mixing and stirring, add Shield silt particle, together dry mixing 1～2 minutes, obtain dry blend；

3) water reducer be added to the water and stir, being then added to step 2) in the dry blend of gained, remix stirring 2～ 3 minutes, obtain described big proportion low denseness water resistant dispersion environment-friendly type synchronous grouting material.