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CN1043219C - A kind of lime soil stabilizer - Google Patents

A kind of lime soil stabilizer Download PDF

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Publication number
CN1043219C
CN1043219C CN95112495A CN95112495A CN1043219C CN 1043219 C CN1043219 C CN 1043219C CN 95112495 A CN95112495 A CN 95112495A CN 95112495 A CN95112495 A CN 95112495A CN 1043219 C CN1043219 C CN 1043219C
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CN
China
Prior art keywords
soil
lime
anhydrite
sodium sulfate
solidifying agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN95112495A
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Chinese (zh)
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CN1125702A (en
Inventor
林宗寿
刘顺妮
陈云波
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Wuhan Polytechnic University
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Wuhan Polytechnic University
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Publication date
Application filed by Wuhan Polytechnic University filed Critical Wuhan Polytechnic University
Priority to CN95112495A priority Critical patent/CN1043219C/en
Publication of CN1125702A publication Critical patent/CN1125702A/en
Application granted granted Critical
Publication of CN1043219C publication Critical patent/CN1043219C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0042—Powdery mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

将生石灰、硬石膏、硫酸钠和硫酸铝混合粉磨，即得一种石灰类土壤固化剂。该固化剂适用于固化含水率25%(占干土比例)以下的土壤，它所固化的土壤强度比用生石灰所固化的土壤强度有较大幅度的提高，甚至高于相同掺量的325＃矿渣水泥。Mix and grind quicklime, anhydrite, sodium sulfate and aluminum sulfate to obtain a lime soil stabilizer. This solidifying agent is suitable for solidifying soil with a moisture content below 25% (accounting for dry soil). The strength of the soil solidified by it is much higher than that solidified by quicklime, even higher than that of 325# with the same dosage. Slag cement.

Description

A kind of lime firming agent for soil
The invention belongs to material of construction lime class.
The ground of various buildingss and the basic unit of road and subbase often need to add lime class solidifying agent to improve its intensity.But existing lime firming agent for soil institute solidified resistance of soil is on the low side, strengthen its consumption, though the solidified resistance of soil improves, intensity reduced on the contrary after consumption surpassed certain limit, still can not satisfy the requirement of modern structures such as Highrise buildings and motorway to intensity.
The objective of the invention is to improve the intensity of Lime Stabilization soil, propose in unslaked lime, to add anhydrite, sodium sulfate and Tai-Ace S 150, produce a kind of lime firming agent for soil, make it can adapt to of the requirement of modern structures such as Highrise buildings and motorway intensity.
Advantage of the present invention is to produce a kind of lime firming agent for soil, this solidifying agent is applicable to that solidifying water ratio accounts in the soil of native ratio below 25%, its institute solidified resistance of soil is than the improve that has with unslaked lime solidified resistance of soil by a relatively large margin, even is higher than 325# slag cement solidified resistance of soil.
The present invention is described in detail as follows:
Unslaked lime compacted soil (abbreviation limestone soil) mainly is to utilize unslaked lime and soil that chemical reaction takes place, and makes the variation of the clay composition generation matter in the soil, and its intensity is mainly derived from four aspects:
(1) heating of the aquation of unslaked lime and expansion:
(2) soil and lime carry out ion exchange reaction and make the particulate clay condense granulating group;
(3) native CLAY MINERALS AND THEIR SIGNIFICANCE and colloid SiO 2And Al 2O 3With lime hard the coagulating of chemistry being taken place and react, generates silicic acid lime hydration thing (CaO-SiO 2-H 2O) and aluminic acid lime hydration thing (CaO-Al 2O 3-H 2O) etc., these resultants make soil particle produce cementation.
(4) CO in lime and the soil 2Carbonation reaction takes place produce CaCO 3Precipitation.
Wherein the hard of the 3rd step coagulates the major cause that reaction is a unslaked lime compacted soil generation intensity, and unslaked lime aquation liberated heat can promote this reaction.Anhydrite is the retardant of unslaked lime, and it can make the steady heat release of unslaked lime.This is because the CaSO in the anhydrite 4Can form complex compound with CaO, at CaSO 4The surface generates unsettled complicated hydrate (salt mCaSO 4NH 2O), this hydrate is decomposed into moisture salt and CaSO again then 42H 2O.This just decomposition reaction makes the CaSO of generation 42H 2The continuous crystallization of O overlaps soil particle:
Sodium sulfate (Na 2SO 4) and Tai-Ace S 150 (Al 2(SO 4) 3) and CaSO 4Also above-mentioned reaction can take place.In addition, Na 2SO 4Can also with Ca (OH) 2Reaction generates CaSO 4And NaOH, CaSO 4Can get up early again and pretend usefulness, NaOH can dissolve the layered silicate on soil particle surface, generates diffluent water glass and sodium aluminate, and they are with the Ca in the compound (OH) 2, CaSO 42H 2The easy water generation reaction Calucium Silicate powder of O, drated calcium aluminate gel, ettringite and NaOH, newly-generated NaOH again with clay mineral generation solubilizing reaction, go round and begin again like this, improved institute's solidified resistance of soil greatly.Al 2(SO 4) 3Also can same Ca (OH) 2Reaction generates ettringite and CaSO 4, CaSO wherein 4Can function as described above again, the further filling pore of ettringite, thus further improved the intensity of the soil body.
With unslaked lime, anhydrite, sodium sulfate and Tai-Ace S 150 combined grinding to specific surface area 250～900m 2/ kg, best 300～500m 2/ kg can produce the lime class solidifying agent that is applicable to low water content soil.Used unslaked lime refers to commercially available various unslaked limes among the present invention, anhydrite be natural anhydrite or with dihydrate gypsum through 600～1100 ℃ the calcining gained dehydrated gyp-s, its main component is CaSO 4, sodium sulfate and Tai-Ace S 150 are commercially available Chemicals.The volume of anhydrite accounts for 0.5～15% in solidifying agent, the optimum mix amount 3～9%, volume very little, DeGrain, volume can make strength of lime soil reduce too much.The volume of sodium sulfate accounts for 0.5～10% in solidifying agent, the optimum mix amount 1～6%, volume very little, DeGrain, volume can make strength of lime soil reduce too much.The base of mixing of Tai-Ace S 150 accounts for 1～15% in solidifying agent, the optimum mix amount 4～10%, volume very little, DeGrain, volume is too many, and strength of lime soil is reduced.
Example
Raw materials used chemical ingredients sees Table 1.
Table 1
Raw material SiO 2 Al 2O 3 Fe 2O 3 CaO MgO SO 3 IL
Unslaked lime 0.020 0.012 0.004 93.98 0.020 0 0
The 325# slag cement 29.18 9.04 2.31 50.04 5.22 2.58 2.40
Soil 68.42 13.85 4.85 2.52 2.00 / 4.38
Anhydrite 10.29 2.46 0.91 33.30 2.97 41.9 6.06
The pH value of soil is 7.4.
The prescription of soil-solidified-agent of the present invention and existing soil-solidified-agent sees Table 2.
Table 2
Technology Numbering Unslaked lime Anhydrite Sodium sulfate Tai-Ace S 150 The 325# slag cement
The present invention A1 86.5 0.5 5 8 /
The present invention A2 84 3 5 8 /
The present invention A3 81 6 5 8 /
The present invention A4 72 15 5 8 /
The present invention A5 88.50 3 0.5 8 /
The present invention A6 86 3 3 8 /
The present invention A7 79 3 10 8 /
The present invention A8 91 3 5 1 /
The present invention A9 88 3 5 4 /
The present invention A10 77 3 5 15 /
Existing A11 100 / / / /
Existing A12 / / / / 100
Press the proportioning of table 2, with unslaked lime, anhydrite, sodium sulfate and Tai-Ace S 150 combined grinding to specific surface area 400 ± 20m 2/ kg makes each number soil-solidified-agent, and they are mixed respectively in the soil, and the transportation industry standard TJT057-94 that issues according to the Ministry of Communications carries out ruggedness test.The soil sample water ratio is 16%, and the soil-solidified-agent volume is 8%, design unit dry weight 1.89g/cm 3Gained the results are shown in Table 3.
Table 3
Sample 7 days intensity 28 days intensity
A1 1.98 3.85
A2 2.73 4.85
A3 2.12 4.15
A4 1.92 3.98
A5 2.00 4.10
A6 2.25 4.35
A7 1.95 3.80
A8 2.27 4.17
A9 2.55 4.54
A10 1.96 4.08
A11 1.76 3.06
A12 1.94 4.04
According to the A2 proportioning in the table 2, unslaked lime, anhydrite, sodium sulfate and Tai-Ace S 150 combined grinding to different fineness, to be mixed the solidifying agent of gained different fineness respectively and to carry out ruggedness test in the soil, the method for inspection is the same, and experiment condition is the same, and gained the results are shown in Table 4.
Table 4
Sample Specific surface area m 2/kg 7 days intensity 28 days intensity
A2 250 1.98 3.77
A2 401 2.73 4.85
A2 611 3.01 4.94
A2 900 3.12 4.98
When soil moisture content not simultaneously, mix the solidifying agent that makes by the A2 proportioning in the table 2 and carry out ruggedness test again, the method for inspection is the same.Except that soil sample water ratio difference, all the other experiment conditions are the same.Gained the results are shown in Table 5.
Table 5
Sample Soil moisture content % 7 days intensity MPa 28 days intensity MPa
A2 8 4.00 5.51
A2 12 3.51 5.02
A2 16 2.73 4.85
A2 20 2.24 3.82
A2 25 1.66 3.16

Claims (2)

1、一种石灰类土壤固化剂，其特征在于所述的固化剂是由生石灰、硬石膏、硫酸钠和硫酸铝组成，各原料组成(重量％)为：1, a kind of lime soil solidifying agent, it is characterized in that described solidifying agent is made up of unslaked lime, anhydrite, sodium sulfate and aluminum sulfate, and each raw material forms (weight %) as:     生石灰    60-98Quicklime 60-98     硬石膏    0、5-15Anhydrite 0, 5-15     硫酸钠    0、5-10Sodium sulfate 0, 5-10     硫酸铝    1-15  Aluminum Sulfate 1-15 将上述生石灰、硬石膏、硫酸钠和硫酸铝混合磨至比表面积250-900m2/kg。Mix and grind the above-mentioned quicklime, anhydrite, sodium sulfate and aluminum sulfate until the specific surface area is 250-900m 2 /kg. 2、根据权利要求1所述的石灰类土壤固化剂，其特征在于所述固化剂的原料组成(重量％)最佳为：2. The lime soil solidifying agent according to claim 1, characterized in that the raw material composition (% by weight) of the solidifying agent is optimally:     生石灰    75-92  Quicklime   75-92     硬石膏    3-9Anhydrite 3-9     硫酸钠    1-6Sodium sulfate 1-6     硫酸铝    4-10  Aluminum Sulfate 4-10 粉磨后各原料的最佳比表积为300-500m2/kg。The optimum specific surface area of each raw material after grinding is 300-500m 2 /kg.
CN95112495A 1995-10-20 1995-10-20 A kind of lime soil stabilizer Expired - Fee Related CN1043219C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN95112495A CN1043219C (en) 1995-10-20 1995-10-20 A kind of lime soil stabilizer

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Application Number Priority Date Filing Date Title
CN95112495A CN1043219C (en) 1995-10-20 1995-10-20 A kind of lime soil stabilizer

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CN1043219C true CN1043219C (en) 1999-05-05

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RS49668B (en) * 1998-04-15 2007-09-21 Road Building International (Barbados) Limited, PROCEDURE FOR IMPROVING SOIL ENGINEERING PROPERTIES
CN1067663C (en) * 1998-06-12 2001-06-27 武汉水利电力大学 Soil solidifying agent
CN103161110B (en) * 2011-12-15 2015-12-02 洛阳路世丰土壤固化科技有限公司 The long-lived environmental protection of a kind of water-proofing anticracking is built the road new method
CN102887677B (en) * 2012-10-12 2014-06-25 金川集团股份有限公司 Method for producing gravity cementing filler from secondary quenched slag after nickel residue iron extraction
CN105236788A (en) * 2015-09-09 2016-01-13 济南大学 Additive agent suitable for calcium silicate board
CN106747154B (en) * 2016-11-22 2018-03-02 西南科技大学 A kind of application of travertine geology healant, repair liquid and its repair liquid
CN107033912B (en) * 2017-04-28 2020-05-22 华南理工大学 Heavy metal passivator and preparation method thereof
CN116124104A (en) * 2023-03-03 2023-05-16 生态环境部南京环境科学研究所 Method and device for measuring landscape plaque change space process

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1033374A (en) * 1988-01-19 1989-06-14 浙江工学院 The prescription of sintering-free clay brick

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1033374A (en) * 1988-01-19 1989-06-14 浙江工学院 The prescription of sintering-free clay brick

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
硅酸盐建筑制品(86.NO6) 1984.6.22 石灰固化粘土制品及其机理的研究 *
硅酸盐建筑制品(86.NO6) 1984.6.22 石灰固化粘土制品及其机理的研究;硅酸盐建筑制品(87.NO4) 1987.4.22 海南岛非烧结粘土砖工业性实验 *
硅酸盐建筑制品(87.NO4) 1987.4.22 海南岛非烧结粘土砖工业性实验 *

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