CN116874206A - Large-doping-amount waste glass powder ecological cement cementing material and preparation method thereof - Google Patents

Abstract

The application provides a large-doping-amount waste glass powder ecological cement cementing material and a preparation method thereof. The ecological cement cementing material with large mixing amount of waste glass powder comprises the following components in parts by volume: 40-50 parts of cement and 50-60 parts of waste glass powder; wherein, the components in each particle size range in the waste glass powder are as follows: the component with the proportion of less than 6 μm is 30-35%, the component with the proportion of 6-12 μm is 20-25%, the component with the proportion of 12-24 μm is 5-10%, the component with the proportion of 24-45 μm is 15-20%, and the component with the proportion of 45-80 μm is 15-20%. The ecological cement cementing material can be added with the waste glass powder in a large mixing amount, has the advantages of low preparation cost, simple process, convenient construction and the like, can meet the compressive strength and breaking strength requirements of the cementing material under the condition of not using other chemical additives, and has great significance for energy conservation and emission reduction in the cement industry and recycling of the waste glass material.

Description

A large amount of waste glass powder ecological cement cementitious material and its preparation method

Technical field

The invention relates to the technical field of cementing materials, and in particular to an ecological cement cementing material with a large amount of waste glass powder and a preparation method thereof.

Background technique

The production process of Portland cement generally suffers from high energy consumption, heavy pollution, greenhouse effect and air pollution caused by the emission of carbon dioxide and other gases. The use of auxiliary cementitious materials to partially replace cement can alleviate the above problems in the cement production process. At the same time, glass materials are widely used in construction materials and production and life because of their beautiful appearance and stable chemical properties. However, waste glass is not biodegradable, and traditional landfill treatment will cause serious land occupation and environmental pollution. If waste glass can be crushed and used as an auxiliary cementing material to partially replace cement clinker, it can reduce the amount of cement used and make full use of waste glass and other solid waste materials.

However, existing research shows that the incorporation of waste glass powder will lead to a reduction in the compressive strength and flexural strength of concrete. The ideal dosage is only about 20%, which is not conducive to the full utilization of waste glass. In addition, although there are studies on adjusting the molecular weight of glass materials by using different chemical agents, catalysts and initiators, this approach increases the risk of unknown chemical reactions. Therefore, a method that can add waste glass powder in large amounts and meet the strength requirements of cementitious materials without using other chemical additives is particularly expected.

In view of this, the present invention is proposed.

Contents of the invention

The object of the present invention is to provide an ecological cement gelling material with a large amount of waste glass powder and a preparation method thereof. The ecological cement gelling material can add waste glass powder in a large amount without using other chemical additives. Meet the compressive strength and flexural strength requirements of cementitious materials.

The invention provides a large amount of waste glass powder ecological cement cementitious material, which includes the following volume parts: 40-50 parts of cement and 50-60 parts of waste glass powder; wherein, the waste glass powder contains The proportion of components is as follows: <6μm components account for 30-35%, 6-12μm components account for 20-25%, 12-24μm components account for 5-10%, 24-45μm components account for The proportion of 45-80μm components is 15-20%.

Furthermore, the proportion of components in each particle size range in the waste glass powder is as follows: the proportion of <6 μm components is 31-32%, the proportion of 6-12 μm components is 23-24%, and the proportion of 12-24 μm components It is 8-9%, the 24-45μm component accounts for 17-18%, and the 45-80μm component accounts for 18-19%.

Further, the cement is Portland cement, such as PPⅠ42.5 Portland cement or PPⅡ42.5 Portland cement; in addition, the cement can be cement obtained by passing through a 45 μm square hole sieve.

The present invention also provides a method for preparing the above-mentioned large-amount waste glass powder ecological cement cementitious material, which includes the following steps:

S1: Wash, air-dry, grind, and sieve the waste glass, and mix the components in each particle size range evenly in proportion to obtain waste glass powder;

S2: Mix cement and waste glass powder evenly by volume, then mechanically stir, shape, and cure to obtain a large amount of waste glass powder ecological cement cementitious material.

In step S1, the source of the waste glass is not strictly limited. For example, it can be waste beer bottles, glass containers, flat glass, etc. In addition, there is no strict limit on the grinding time. As long as the required particle size composition can be obtained, the grinding time can be 50-70 minutes.

In step S2, the cement is passed through a 45 μm square hole sieve before mixing; in addition, curing can be performed at a temperature of 18-22°C and a relative humidity exceeding 98%.

The 7-day compressive strength of the large-amount waste glass powder ecological cement cementitious material of the present invention is >28Mpa, for example, 28-36MPa; the 28-day compressive strength is >36Mpa, for example, 36-46MPa; the 7-day flexural strength is >9Mpa. For example, it is 9-11MPa; the 28-day flexural strength is >10Mpa, for example, it is 10.5-12MPa.

This invention overcomes the limitation that waste glass powder cannot replace cement clinker in large quantities without using other chemical reagents. It not only reduces the emission of greenhouse gases such as _CO2 in the cement ecological process, but also consumes a large amount of solid waste such as waste glass. materials, avoiding environmental pollution and land occupation problems caused by traditional landfill, stacking and other treatment methods. This ecological cement cementitious material can add waste glass powder in large amounts, and has the advantages of low preparation cost, simple process and smooth flow of the mixture. It has the advantages of good stability and convenient construction. It can meet the compressive strength and flexural strength requirements of cementitious materials without using other chemical additives. The material volume is stable and has high compressive strength in 7 days and 28 days. and flexural strength, which is of great significance to energy conservation and emission reduction in the cement industry and recycling of waste glass materials, and is suitable for industrial promotion and application.

Description of the drawings

In order to more clearly explain the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description The drawings illustrate some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting any creative effort.

Figure 1 is a flow chart of the preparation process of waste glass powder according to one embodiment.

Detailed ways

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meanings commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular also includes the plural unless the context clearly dictates otherwise. Furthermore, it will be understood that when the terms "include" and/or "include" are used in this specification, they refer to the presence Features, steps, operations, devices, components and/or combinations thereof.

The technical solution of the present invention will be described clearly and completely below with reference to the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Example 1

The steps for preparing the large-amount waste glass powder ecological cement cementitious material in this embodiment are as follows:

1. Cement pretreatment

Pass PPⅠ42.5 Portland cement through a 45 μm square hole sieve, the sieved part is used as cement raw material, and the coarser particle size part is continued to be ground and sieved for use.

2. Preparation of waste glass powder

As shown in Figure 1, waste glass (waste beer bottles, glass containers, flat glass, etc.) is washed and removed from labels, then sun-dried and air-dried, followed by preliminary crushing, and then ground using a ball mill for about 60 minutes.

Use an airflow separator to sieve the ground glass powder, use a laser particle size analyzer to detect the particle size distribution of the waste glass powder, and sieve the ground glass powder into the following particle size ranges: <6 μm component, 6-12 μm Components, 12-24μm components, 24-45μm components, 45-80μm components; coarser glass powder can be ground again and sieved at the same time as the next batch.

Mix the components in each particle size range evenly into a whole according to the interval ratio of each component. The particle size distribution and proportion of the adjusted waste glass powder are shown in Table 1.

Table 1 Particle size range and proportion of waste glass powder

Particle size range <6μm 6-12μm 12-24μm 24-45μm 45-80μm Proportion (%) 31.72 23.88 8.44 17.34 18.62

3. Preparation of large amounts of waste glass powder ecological cement cementitious materials

Mix 50 parts of cement in step 1 and 50 parts of waste glass powder in step 2 in a mixer with a water-cement ratio of 0.4, and then use a mortar mixer to mechanically stir according to the GB/T 17671 standard. After mechanical stirring, use vibration After molding on the molding machine, cover the film for 24 hours and then remove the mold. Move it to a standard curing box with a temperature of (20±2)℃ and a relative humidity of more than 98% for curing. After curing for 7 days and 28 days, perform compression resistance on the MTS hydraulic servo testing machine. , anti-bending test, the test results are shown in Table 2.

Example 2

45 parts of cement in Step 1 of Example 1 and 55 parts of waste glass powder in Step 2 of Example 1 were fully mixed in a mixer with a water-cement ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with the GB/T 17671 standard. After mechanical stirring, a vibration table is used for molding. After covering with the film for 24 hours, it is demoulded and moved to a standard curing box with a temperature of (20±2)℃ and a relative humidity of more than 98% for curing. After curing for 7 days and 28 days, it is placed in the MTS hydraulic Compression and bending tests were carried out on a servo testing machine. The test results are shown in Table 2.

Example 3

40 parts of cement in Step 1 of Example 1 and 60 parts of waste glass powder in Step 2 of Example 1 were fully mixed in a mixer with a water-cement ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with the GB/T 17671 standard. After mechanical stirring, a vibration table is used for molding. After covering with the film for 24 hours, it is demoulded and moved to a standard curing box with a temperature of (20±2)℃ and a relative humidity of more than 98% for curing. After curing for 7 days and 28 days, it is placed in the MTS hydraulic Compression and bending tests were carried out on a servo testing machine. The test results are shown in Table 2.

Comparative example 1

Commercially available PPO 42.5 grade ordinary Portland cement was used as a control. The PPO 42.5 grade ordinary Portland cement was passed through a 45 μm square hole sieve, and the sieved portion was used as the cement raw material for this comparative example.

Mix the above-mentioned cement thoroughly in a mixer with a water-cement ratio of 0.4, and then use a mortar mixer for mechanical mixing in accordance with the GB/T17671 standard. After mechanical mixing, use a vibrating table to form, cover with the film for 24 hours and demould after 24 hours, and move to a temperature of ( Curing is carried out in a standard curing box at 20±2)℃ and relative humidity exceeding 98%. After 7 days and 28 days of curing, compression and bending tests are carried out on the MTS hydraulic servo testing machine. The test results are shown in Table 2.

Comparative example 2

Use the waste glass powder prepared in Example 1 of CN 115196917 A (that is, wash the waste glass to remove the label, air-dry, and then conduct preliminary crushing, then use a ball mill to grind for about 30 minutes, and pass through the sieved part of an 80 μm square hole sieve) as a control.

Mix 50 parts of cement in step 1 of Example 1 and 50 parts of the above-mentioned waste glass powder in a mixer with a water-cement ratio of 0.4, and then use a mortar mixer to mechanically stir according to the GB/T 17671 standard. After mechanical stirring, use vibration After molding on the molding machine, cover the film for 24 hours and then remove the mold. Move it to a standard curing box with a temperature of (20±2)℃ and a relative humidity of more than 98% for curing. After curing for 7 days and 28 days, perform compression resistance on the MTS hydraulic servo testing machine. , anti-bending test, the test results are shown in Table 2.

Comparative example 3

The waste glass powder with a component of <6 μm prepared in Example 1 was used as a control.

50 parts of cement in step 1 of Example 1 and 50 parts of the above-mentioned waste glass powder (<6 μm component) were fully mixed in a mixer with a water-cement ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with the GB/T 17671 standard. After mechanical stirring, a vibration table is used for molding. After covering with the film for 24 hours, it is demoulded and moved to a standard curing box with a temperature of (20±2)℃ and a relative humidity of more than 98% for curing. After curing for 7 days and 28 days, it is placed in the MTS hydraulic Compression and bending tests were carried out on a servo testing machine. The test results are shown in Table 2.

Comparative Example 4

The waste glass powder with a composition of 45-80 μm prepared in Example 1 was used as a control.

50 parts of cement in step 1 of Example 1 and 50 parts of the above-mentioned waste glass powder (45-80 μm component) were fully mixed in a mixer with a water-cement ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with the GB/T 17671 standard. , use a vibration table to form after mechanical stirring, cover with the film for 24 hours and then demould, move to a standard curing box with a temperature of (20 ± 2) ℃ and a relative humidity of more than 98% for curing. After curing for 7 days and 28 days, place it in MTS Compression and bending tests were carried out on a hydraulic servo testing machine. The test results are shown in Table 2.

Table 2 Proportions and test results of cement cementitious materials

The results in Table 2 show:

The 28-day compressive strength and flexural strength of the waste glass powder ecological cement cementitious material in this embodiment can be equivalent to that of cement with a strength level of 42.5 when the volume of waste glass powder is 50% or 55%; when the volume of waste glass powder is When the dosage is 60%, the 28-day compressive strength can reach the cement strength level of 32.5. It can be seen that the ecological cement cementitious material of this embodiment can add waste glass powder in a large dosage without using other chemical additives. Under the conditions, it can meet the compressive strength and flexural strength requirements of cementitious materials.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. The ecological cement cementing material with large mixing amount of waste glass powder is characterized by comprising the following components in parts by volume: 40-50 parts of cement and 50-60 parts of waste glass powder; wherein, the components in each particle size range in the waste glass powder are as follows: the component with the proportion of less than 6 μm is 30-35%, the component with the proportion of 6-12 μm is 20-25%, the component with the proportion of 12-24 μm is 5-10%, the component with the proportion of 24-45 μm is 15-20%, and the component with the proportion of 45-80 μm is 15-20%.

2. The high-doped waste glass frit ecological cement gel material according to claim 1, wherein the components in the waste glass frit in each particle size range occupy the following ranges: the component with the proportion of less than 6 mu m is 31-32%, the component with the proportion of 6-12 mu m is 23-24%, the component with the proportion of 12-24 mu m is 8-9%, the component with the proportion of 24-45 mu m is 17-18%, and the component with the proportion of 45-80 mu m is 18-19%.

3. The high-doped waste glass frit ecological cement binder according to claim 1, wherein the cement is Portland cement.

4. The high-doped waste glass frit ecological cement binding material according to claim 3, wherein the cement is PP I42.5 Portland cement or PP II 42.5 Portland cement.

5. The high-doped waste glass frit ecological cement binding material according to claim 1, wherein the cement is obtained by sieving with a 45 μm square sieve.

6. The method for preparing the ecological cement cementing material with the large mixing amount of the waste glass powder as claimed in any one of claims 1 to 5, which is characterized by comprising the following steps:

s1: cleaning, air-drying, grinding and screening the waste glass, and uniformly mixing the components in each particle size range according to the ratio to obtain waste glass powder;

s2: and uniformly mixing cement and waste glass powder according to the volume parts, and then mechanically stirring, forming and maintaining to obtain the ecological cement cementing material with large mixing amount of the waste glass powder.

7. The method according to claim 6, wherein in the step S1, the source of the waste glass is at least one of a waste beer bottle, a glass container and a flat glass.

8. The method according to claim 6, wherein the grinding time is 50-70min in step S1.

9. The method according to claim 6, wherein in step S2, the cement is sieved through a 45 μm square sieve before mixing.

10. The method according to claim 6, wherein in step S2, curing is performed at a temperature of 18 to 22℃and a relative humidity of more than 98%.