Ecological cement gelling material with high content of waste glass powder and preparation method thereof

Abstract

The present invention provides an ecological cement cementitious material with a large amount of waste glass powder and a preparation method thereof. The ecological cement cementitious material with a large amount of waste glass powder of the present invention comprises the following components in parts by volume: 40-50 parts of cement and 50-60 parts of waste glass powder; wherein, the proportion of components in each particle size range in the waste glass powder is as follows: the proportion of components <6μm is 30-35%, the proportion of components 6-12μm is 20-25%, the proportion of components 12-24μm is 5-10%, the proportion of components 24-45μm is 15-20%, and the proportion of components 45-80μm is 15-20%. The ecological cement cementitious material of the present invention can be added with waste glass powder in a large amount, and has the advantages of low preparation cost, simple process, and convenient construction. It can meet the compressive strength and flexural strength requirements of the cementitious material without using other chemical additives, and is of great significance to energy conservation and emission reduction in the cement industry and the recycling of waste glass materials.

Description

Technical Field

[0001] The invention relates to the technical field of cementitious materials, in particular to an ecological cement cementitious material with a large amount of waste glass powder and a preparation method thereof. Background Art

[0002] The production process of Portland cement is generally plagued by high energy consumption, heavy pollution, and greenhouse effects and air pollution caused by the emission of gases such as carbon dioxide. Using supplementary cementitious materials to partially replace cement can alleviate these issues in the cement production process. Meanwhile, glass, due to its aesthetics and chemical stability, is widely used in building materials and production. However, waste glass is non-biodegradable, and traditional landfill disposal results in significant land occupation and environmental pollution. If waste glass could be crushed and used as a supplementary cementitious material to partially replace cement clinker, cement usage could be reduced while fully utilizing solid waste materials such as waste glass.

[0003] However, existing research indicates that the addition of waste glass powder reduces the compressive and flexural strengths of concrete, with an ideal addition level of only around 20%, hindering the full utilization of waste glass. Furthermore, while research has explored adjusting the molecular weight of glass materials using various chemicals, catalysts, and initiators, this approach increases the risk of unpredictable chemical reactions. Therefore, a method for incorporating large amounts of waste glass powder without the use of other chemical additives is highly sought after.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an ecological cement cementitious material with a large amount of waste glass powder and a preparation method thereof. The ecological cement cementitious material can be added with a large amount of waste glass powder and can meet the compressive strength and flexural strength requirements of the cementitious material without using other chemical additives.

[0006] The present invention provides an ecological cement cementitious material with a large amount of waste glass powder, comprising the following components by volume: 40-50 parts of cement and 50-60 parts of waste glass powder; wherein the proportions of components in each particle size range in the waste glass powder are as follows: the proportion of components less than 6 μm is 30-35%, the proportion of components between 6 and 12 μm is 20-25%, the proportion of components between 12 and 24 μm is 5-10%, the proportion of components between 24 and 45 μm is 15-20%, and the proportion of components between 45 and 80 μm is 15-20%.

[0007] Furthermore, the proportion of components in each particle size range in the waste glass powder is as follows: the proportion of components less than 6μm is 31-32%, the proportion of components between 6-12μm is 23-24%, the proportion of components between 12-24μm is 8-9%, the proportion of components between 24-45μm is 17-18%, and the proportion of components between 45-80μm is 18-19%.

[0008] Furthermore, the cement is silicate cement, such as PPⅠ42.5 silicate cement or PPⅡ42.5 silicate cement; in addition, the cement can be cement obtained by passing through a 45 μm square hole sieve.

[0009] The present invention also provides a method for preparing the above-mentioned ecological cement gelling material with a large amount of waste glass powder, comprising the following steps:

[0010] S1: Washing, air-drying, grinding, and sieving the waste glass, and mixing the components of each particle size range in proportion to obtain waste glass powder;

[0011] S2: Evenly mix cement and waste glass powder according to volume, and then mechanically stir, shape, and cure to obtain an ecological cement gelling material with a large amount of waste glass powder.

[0012] In step S1, the source of the waste glass is not strictly limited, and can be, for example, waste beer bottles, glass containers, flat glass, etc. In addition, there is no strict limit on the grinding time, as long as the desired particle size composition can be obtained, and the grinding time can be 50-70 minutes.

[0013] In step S2, the cement is first passed through a 45 μm square mesh sieve before mixing; in addition, the cement can be cured at a temperature of 18-22° C. and a relative humidity exceeding 98%.

[0014] The ecological cement cementitious material with a large amount of waste glass powder added according to the present invention has a 7-day compressive strength of >28 MPa, for example, 28-36 MPa; a 28-day compressive strength of >36 MPa, for example, 36-46 MPa; a 7-day flexural strength of >9 MPa, for example, 9-11 MPa; and a 28-day flexural strength of >10 MPa, for example, 10.5-12 MPa.

[0015] The present 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, avoiding the environmental pollution and land occupation problems caused by traditional landfill, stacking and other treatment methods. The ecological cement cementitious material can be added with waste glass powder in large quantities, has the advantages of low preparation cost, simple process, good fluidity of the mixture, and convenient construction. It can meet the compressive strength and flexural strength requirements of the cementitious material without using other chemical additives. The material volume is stable and has high compressive strength and flexural strength at 7 days and 28 days. It is of great significance to energy conservation and emission reduction in the cement industry and the recycling of waste glass materials, and is suitable for industrial promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 The present invention is a flow chart of a process for preparing waste glass powder according to one embodiment. DETAILED DESCRIPTION

[0018] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0019] 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, unless the context clearly indicates otherwise, the singular also includes the plural. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1

[0022] The preparation method of the ecological cement gelling material with a large amount of waste glass powder in this embodiment comprises the following steps:

[0023] 1. Cement pretreatment

[0024] The PPⅠ42.5 silicate cement was passed through a 45μm square hole sieve. The sieved part was used as cement raw material, and the coarser particle size part was further ground and sieved before use.

[0025] 2. Preparation of waste glass powder

[0026] Combine Figure 1 As shown, the waste glass (waste beer bottles, glass containers, flat glass, etc.) is cleaned and the labels are removed, then air-dried, and then preliminarily crushed and ground using a ball mill for about 60 minutes.

[0027] The ground glass powder is screened using an air flow separator, and the particle size distribution of the waste glass powder is detected by a laser particle size analyzer. The ground glass powder is screened into the following particle size ranges: <6μm component, 6-12μm component, 12-24μm component, 24-45μm component, and 45-80μm component; the coarser glass powder can be ground again and screened at the same time as the next batch.

[0028] The components in each particle size range were mixed 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.

[0029] Table 1 Particle size range and proportion of waste glass powder

[0030] Particle size range <6μm 6-12μm 12-24μm 24-45μm 45-80μm Proportion (%) 31.72 23.88 8.44 17.34 18.62

[0031] 3. Preparation of ecological cement gelling materials with large amounts of waste glass powder

[0032] 50 parts of cement in step 1 and 50 parts of waste glass powder in step 2 were fully mixed in a mixer at a water-cement ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with GB / T 17671. After mechanical stirring, the mixture was formed using a vibration table. After being covered with a film for 24 hours, the mixture was demoulded and moved to a standard curing box with a temperature of (20±2)°C and a relative humidity exceeding 98% for curing. After curing for 7 days and 28 days, compression and flexural tests were performed on an MTS hydraulic servo testing machine. The test results are shown in Table 2.

[0033] Example 2

[0034] 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 at a water-binder ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with GB / T 17671. After mechanical stirring, the mixture was formed using a vibration table, and the mixture was demolded after being covered with a film for 24 hours. The mixture was moved to a standard curing box with a temperature of (20±2)°C and a relative humidity exceeding 98% for curing. After curing for 7 days and 28 days, compression and flexural tests were performed on an MTS hydraulic servo testing machine. The test results are shown in Table 2.

[0035] Example 3

[0036] 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 at a water-cement ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with GB / T 17671. After mechanical stirring, the mixture was formed using a vibration table, and the mixture was demolded after being covered with a film for 24 hours. The mixture was moved to a standard curing box with a temperature of (20±2)°C and a relative humidity exceeding 98% for curing. After curing for 7 days and 28 days, compression and flexural tests were performed on an MTS hydraulic servo testing machine. The test results are shown in Table 2.

[0037] Comparative Example 1

[0038] 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 of this control example.

[0039] The above cement was fully mixed in a mixer at a water-binder ratio of 0.4, and then mechanically stirred using a mortar mixer according to GB / T17671 standard. After mechanical stirring, it was formed using a vibration table. After being covered with a film for 24 hours, it was demoulded and moved to a standard curing box with a temperature of (20±2)°C and a relative humidity of more than 98% for curing. After curing for 7 days and 28 days, compression and flexural tests were carried out on an MTS hydraulic servo testing machine. The test results are shown in Table 2.

[0040] Comparative Example 2

[0041] The waste glass powder prepared in Example 1 of CN 115196917 A (i.e., the waste glass was cleaned, the labels were removed, and then air-dried, initially crushed, ground in a ball mill for about 30 minutes, and the sieved portion was passed through an 80 μm square mesh sieve) was used as a control.

[0042] 50 parts of cement in step 1 of Example 1 and 50 parts of the above-mentioned waste glass powder were fully mixed in a mixer at a water-binder ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with GB / T 17671. After mechanical stirring, the mixture was formed using a vibration compaction table. After being covered with a film for 24 hours, the mixture was demolded and moved to a standard curing box with a temperature of (20±2)°C and a relative humidity exceeding 98% for curing. After curing for 7 days and 28 days, compression and flexural tests were performed on an MTS hydraulic servo testing machine. The test results are shown in Table 2.

[0043] Comparative Example 3

[0044] The waste glass powder with a component of less than 6 μm prepared in Example 1 was used as a control.

[0045] 50 parts of the cement in step 1 of Example 1 and 50 parts of the above-mentioned waste glass powder (component <6 μm) were fully mixed in a mixer at a water-binder ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with GB / T 17671. After mechanical stirring, the mixture was formed using a vibration compaction table, and the mixture was demolded after being covered with a film for 24 hours. The mixture was moved to a standard curing box with a temperature of (20±2)°C and a relative humidity exceeding 98% for curing. After curing for 7 days and 28 days, compression and flexural tests were performed on an MTS hydraulic servo testing machine. The test results are shown in Table 2.

[0046] Comparative Example 4

[0047] The waste glass powder with a component of 45-80 μm prepared in Example 1 was used as a control.

[0048] 50 parts of the 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 at a water-cement ratio of 0.4, and then mechanically stirred using a mortar mixer in accordance with GB / T 17671. After mechanical stirring, the mixture was formed using a vibration table, and the mixture was demolded after being covered with a film for 24 hours. The mixture was moved to a standard curing box with a temperature of (20±2)°C and a relative humidity exceeding 98% for curing. After curing for 7 days and 28 days, compression and flexural tests were performed on an MTS hydraulic servo testing machine. The test results are shown in Table 2.

[0049] Table 2 Proportions of cementitious materials and test results

[0050]

[0051] The results in Table 2 show that:

[0052] When the volume content of the waste glass powder ecological cement cementitious material in this embodiment is 50% and 55%, the 28-day compressive strength and flexural strength can be equivalent to those of cement with a strength grade of 42.5; when the volume content of the waste glass powder is 60%, the 28-day compressive strength can reach the strength level of 32.5-grade cement; it can be seen that the ecological cement cementitious material in this embodiment can be added with a large amount of waste glass powder, and can meet the compressive strength and flexural strength requirements of the cementitious material without using other chemical additives.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-volume waste glass powder ecological cement gelling material, characterized in that: The invention is composed of the following components in parts by volume: 40-50 parts of cement and 50-60 parts of waste glass powder; wherein, the proportions of components in each particle size range in the waste glass powder are as follows: the proportion of components less than 6 μm is 31-32%, the proportion of components between 6 and 12 μm is 23-24%, the proportion of components between 12 and 24 μm is 8-9%, the proportion of components between 24 and 45 μm is 17-18%, and the proportion of components between 45 and 80 μm is 18-19%.

2. The ecological cement gelling material with a large amount of waste glass powder according to claim 1, wherein the cement is silicate cement.

3. The ecological cement gelling material with a large amount of waste glass powder according to claim 2 is characterized in that: The cement is P·Ⅰ42.5 silicate cement or P·Ⅱ42.5 silicate cement.

4. The ecological cement gelling material with a large amount of waste glass powder according to claim 1 is characterized in that: The cement was obtained by passing through a 45 μm square hole sieve.

5. The method for preparing the ecological cement gelling material with a large amount of waste glass powder according to any one of claims 1 to 4, characterized in that: The steps include: S1: Washing, air-drying, grinding, and sieving the waste glass, and mixing the components of each particle size range in proportion to obtain waste glass powder; S2: Evenly mix cement and waste glass powder according to volume, and then mechanically stir, shape, and cure to obtain an ecological cement gelling material with a large amount of waste glass powder.

6. The preparation method according to claim 5, characterized in that In step S1, the source of the waste glass is at least one of waste beer bottles, glass containers and flat glass.

7. The preparation method according to claim 5, characterized in that In step S1, the grinding time is 50-70 min.

8. The preparation method according to claim 5, characterized in that In step S2, the cement is first passed through a 45 μm square mesh sieve before mixing.

9. The preparation method according to claim 5, characterized in that In step S2, curing is performed at a temperature of 18-22° C. and a relative humidity exceeding 98%.

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