CN113264700B - Regenerated cementing material based on subway shield sludge - Google Patents

Regenerated cementing material based on subway shield sludge Download PDF

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Publication number
CN113264700B
CN113264700B CN202110573657.7A CN202110573657A CN113264700B CN 113264700 B CN113264700 B CN 113264700B CN 202110573657 A CN202110573657 A CN 202110573657A CN 113264700 B CN113264700 B CN 113264700B
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parts
mixture
sludge
regenerated
shield sludge
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CN113264700A (en
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王文圣
黄修林
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Shenzhen Hengjun Environmental Protection Technology Co ltd
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Shenzhen Hengjun Environmental Protection Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B11/00Calcium sulfate cements
    • C04B11/28Mixtures thereof with other inorganic cementitious materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B12/00Cements not provided for in groups C04B7/00 - C04B11/00
    • C04B12/005Geopolymer cements, e.g. reaction products of aluminosilicates with alkali metal hydroxides or silicates

Abstract

The invention provides a regenerated cementing material based on subway shield sludge, which is prepared by mixing quicklime, phosphogypsum, metakaolin, sodium hydroxide, water glass, sodium hypochlorite, construction waste and shield sludge, and comprises the following raw materials in parts by mass: 7-20 parts of shield sludge, 3-10 parts of quick lime, 67-88 parts of construction waste, 2-3 parts of phosphogypsum, 3-7 parts of metakaolin, 2-5 parts of sodium hydroxide, 1-3 parts of water glass and 1-3 parts of sodium hypochlorite; the prepared regenerated cementing material can replace cement and fly ash in concrete, not only solves the problem of recycling shield sludge, but also solves the problem of resource unevenness of the cement or the fly ash, and meanwhile, the provided preparation method has the advantages of simple operation, low cost, safety and stability.

Description

Regenerated cementing material based on subway shield sludge
Technical Field
The invention belongs to the field of building materials, and particularly relates to a regenerated cementing material based on subway shield sludge.
Background
With the rapid development of the urban subway industry, the disposal problem of shield sludge as an inevitable byproduct of subway construction becomes severe and urgent. At present, the main treatment method of sludge is to prepare ceramsite after landfill or calcination, but shield sludge generally has high water content and is difficult to stack, land resources are occupied by field airing, and the shield sludge is difficult to transport outside and has great environmental pollution. In addition, the special floc structure and high hydrophilicity of the shield sludge particles make the water contained in the shield sludge particles difficult to remove, and if a dehydration process is adopted, the efficiency is low and the cost is high. Meanwhile, with the increasing use of mineral admixtures in the concrete industry, the demand of fly ash and slag powder is increased, and the problem of obvious insufficient supply of fly ash in many areas is caused by uneven resource distribution of fly ash and slag powder. Therefore, at present, a method for resource utilization of shield sludge needs to be found, and the problem of insufficient resources of fly ash and slag powder also needs to be solved.
Disclosure of Invention
The invention provides a regenerated cementing material based on subway shield sludge, which is prepared by mixing quicklime, phosphogypsum, metakaolin, sodium hydroxide, water glass, sodium hypochlorite, construction waste and shield sludge, and can replace cement and fly ash in concrete, thereby solving the problem of recycling shield sludge and the problem of resource nonuniformity of cement or fly ash.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
a regenerated cementing material based on subway shield sludge is prepared by the following steps: (1) weighing the raw materials according to the following proportion, wherein the raw materials and the parts by mass are as follows: 7-20 parts of shield sludge, 3-10 parts of quick lime, 67-88 parts of construction waste, 2-3 parts of phosphogypsum, 3-7 parts of metakaolin, 2-5 parts of sodium hydroxide, 1-3 parts of water glass and 1-3 parts of sodium hypochlorite;
(2) respectively grinding the quicklime, the phosphogypsum, the metakaolin and the construction waste, sieving by using a screen, and uniformly stirring and mixing the sieved quicklime, the construction waste, the shield sludge, sodium hypochlorite, sodium hydroxide and water glass to obtain a mixture A;
(3) and (3) reacting the mixture A at normal temperature for 20-40 min, reducing the water content of the mixture A to be less than or equal to 35% after the reaction is finished, uniformly stirring and mixing the mixture A with the phosphogypsum and metakaolin which are sieved in the step (2) to obtain a mixture B, heating and reacting the mixture B at 750-850 ℃ for 10-25 h, wherein the water content of a product after the reaction is finished is less than or equal to 1%, and rolling, grinding and inspecting the product to obtain a finished product, namely the regenerated gel material.
The construction waste is one or a mixture of more than two of construction waste fine powder, granite powder and engineering waste slag.
And (3) screening quicklime and construction waste through a 200-mesh sieve in the step (2).
And (4) reacting the mixture A in the step (3) at normal temperature for 30-40 min.
The application of the regenerated cementing material based on the subway shield sludge is used as a substitute for cement and fly ash in concrete.
Compared with the prior art, the beneficial effects of the regenerated cementing material based on the subway shield sludge provided by the invention are as follows: 1. the invention optimally designs the component proportion of each solid waste to shield the silt, the metakaolin, the quicklime and the construction wasteAs a base material, wherein the addition of metakaolin helps to reduce the brittleness of the regenerated cementitious material, the CaSO in phosphogypsum4·2H2O can be mixed with CaO and Al2O3Reacting to generate AFt, increasing the strength of a finished product, wherein the phosphogypsum has fine particles and can play a role of micro-aggregate and increase the compactness of the finished product, sodium hypochlorite is used as a sterilization and deodorization agent to react with microorganisms in shield sludge, and sodium hydroxide and water glass are used as alkali activators to react with the shield sludge and metakaolin, so that hydration reaction and volcanic ash reaction are fully carried out to form cementation strength; the water content of the finished product prepared from the materials is below 1%, so that the problems of large shield sludge amount, high dehydration cost, low consumption rate and low added value of a disposal method are solved, the shield sludge is recycled, the problems of shield sludge pollution, land occupation and difficult transportation are solved, and the problem of recycling other construction wastes is solved; 2. according to the invention, through the reaction between the main materials, the shield sludge can be solidified into the regenerated cementing material, and can replace cement and fly ash, so that resources can be recycled, the cost is saved, and meanwhile, the pollution of construction waste is reduced; 3. according to the invention, acid-base micro-corrosion surface modification and calcium-increasing calcination surface modification are adopted to improve the material performance of the shield sludge with low activity, improve the activity of the shield sludge, relieve the problem of low early strength caused by using a regenerated cementing material as an admixture in concrete, and improve the comprehensive utilization rate.
Drawings
FIG. 1 is a photograph of a finished product of example 1 provided by the present invention;
fig. 2 is a picture of a finished product of example 1 applied to concrete.
Detailed Description
The invention is further illustrated by the following examples and figures.
Example 1
The regenerated cementing material based on the subway shield sludge provided by the embodiment is prepared by the following steps:
(1) weighing the raw materials according to the following proportion, wherein the raw materials and the parts by mass are as follows: 7 parts of shield sludge, 3 parts of quicklime, 88 parts of construction waste and 2 parts of phosphogypsum, wherein the construction waste is construction waste fine powder, 3 parts of metakaolin, 2 parts of sodium hydroxide, 1 part of water glass and 1 part of sodium hypochlorite;
(2) respectively grinding quicklime, phosphogypsum, metakaolin and construction waste into powder and sieving by using a 200-mesh sieve until the surplus of the quicklime is 5 percent and the surplus of the construction waste is 10 percent, and stirring and uniformly mixing the sieved quicklime, construction waste, shield sludge, sodium hypochlorite, sodium hydroxide and water glass to obtain a mixture A;
(3) and (3) reacting the mixture A at normal temperature for 20min, reducing the water content of the mixture A to 30%, uniformly stirring and mixing the mixture A with the phosphogypsum and metakaolin which are sieved in the step (2) to obtain a mixture B, heating the mixture B at 750 ℃ for reacting for 10h to obtain a product with the water content of 1%, and rolling, grinding and inspecting the product to obtain a finished product.
The finished product prepared by the embodiment is in a shape shown in figure 1, is dried, fluffy, uniform and fine, and is added into concrete in a shape shown in figure 2.
Example 2
The regenerated cementing material based on the subway shield sludge provided by the embodiment is prepared by the following steps:
(1) weighing the raw materials according to the following proportion, wherein the raw materials and the parts by mass are as follows: 20 parts of shield sludge, 10 parts of quicklime, 67 parts of construction waste, 3 parts of phosphogypsum, 5 parts of metakaolin, 3 parts of sodium hydroxide, 2 parts of water glass and 2 parts of sodium hypochlorite, wherein the construction waste is granite powder;
(2) respectively grinding quicklime, phosphogypsum, metakaolin and construction waste into powder and sieving by using a 200-mesh sieve until the residue of the quicklime is 8 percent and the residue of the construction waste is 15 percent, and stirring and uniformly mixing the sieved quicklime, construction waste, shield sludge, sodium hypochlorite, sodium hydroxide and water glass to obtain a mixture A;
(3) and (3) reacting the mixture A at normal temperature for 25min, reducing the water content of the mixture A to 35%, uniformly stirring and mixing the mixture A with the phosphogypsum and metakaolin which are sieved in the step (2) to obtain a mixture B, heating the mixture B at 800 ℃ for reacting for 15h to obtain a product with the water content of 1%, and rolling, grinding and inspecting the product to obtain a finished product.
Example 3
The regenerated cementing material based on the subway shield sludge provided by the embodiment is prepared by the following steps:
(1) weighing the raw materials according to the following proportion, wherein the raw materials and the parts by mass are as follows: 12 parts of shield sludge, 5 parts of quicklime, 80 parts of construction waste, 3 parts of phosphogypsum, 7 parts of metakaolin, 5 parts of sodium hydroxide, 3 parts of water glass and 3 parts of sodium hypochlorite, wherein the construction waste is engineering waste slag and granite powder;
(2) respectively grinding quicklime, phosphogypsum, metakaolin and construction waste into powder and sieving by using a 200-mesh sieve until the residue of the quicklime is 10 percent and the residue of the construction waste is 20 percent, and stirring and uniformly mixing the sieved quicklime, construction waste, shield sludge, sodium hypochlorite, sodium hydroxide and water glass to obtain a mixture A;
(3) and (3) reacting the mixture A at normal temperature for 35min, reducing the water content of the mixture A to 35%, uniformly stirring and mixing the mixture A with the phosphogypsum and metakaolin which are sieved in the step (2) to obtain a mixture B, heating the mixture B at 850 ℃ for reacting for 25h to obtain a product with the water content of 1%, and rolling, grinding and inspecting the product to obtain a finished product.
The tests of replacing cement with the finished product of the above example are shown in the table below, and according to the comparison between the examples 1 and 2 and the reference sample, it can be seen that there is no obvious difference in the compressive strength after 28 days of curing by using the finished product of the example to replace cement, and meanwhile, according to the slump data, the larger the proportion of replacing the finished product is, the larger the slump is, the larger the fluidity of concrete is, and the proportion of the finished product can be adjusted according to the concrete requirements of different construction sites so as to meet the slump requirement. The data analysis of the test examples shows that the performance of the concrete doped with the finished product prepared by the invention has no obvious difference with the performance of the concrete prepared by the cement, so that the finished product prepared by the invention can replace the cement in the concrete and has wide application prospect.

Claims (5)

1. The utility model provides a regeneration cementitious material based on subway shield silt which characterized in that: the regenerated cementing material is prepared by adopting the following steps: (1) weighing the raw materials according to the following proportion, wherein the raw materials and the parts by mass are as follows: 7-20 parts of shield sludge, 3-10 parts of quicklime, 67-88 parts of construction waste, 2-3 parts of phosphogypsum, 3-7 parts of metakaolin, 2-5 parts of sodium hydroxide, 1-3 parts of water glass and 1-3 parts of sodium hypochlorite;
(2) respectively grinding quicklime, phosphogypsum, metakaolin and construction waste, sieving by using a screen, and uniformly stirring and mixing the sieved quicklime, construction waste, shield sludge, sodium hypochlorite, sodium hydroxide and water glass to obtain a mixture A;
(3) and (3) reacting the mixture A at normal temperature for 20-40 min, reducing the water content of the mixture A to be less than or equal to 35% after the reaction is finished, uniformly stirring and mixing the mixture A with the phosphogypsum and metakaolin which are sieved in the step (2) to obtain a mixture B, heating and reacting the mixture B at 750-850 ℃ for 10-25 h, wherein the water content of a product after the reaction is finished is less than or equal to 1%, and rolling, grinding and inspecting the product to obtain a finished product, namely the regenerated gel material.
2. The subway shield sludge-based regenerated cementing material as claimed in claim 1, wherein: the construction waste is one or a mixture of more than two of construction waste fine powder, granite powder and engineering waste slag.
3. The subway shield sludge-based regenerated cementing material as claimed in claim 1, wherein: and (3) screening quicklime and construction waste through a 200-mesh sieve in the step (2).
4. The subway shield sludge-based regenerated cementing material as claimed in claim 1, wherein: and (4) reacting the mixture A in the step (3) at normal temperature for 30-40 min.
5. The use of the regenerated cementitious material based on subway shield sludge as claimed in claim 1, characterized in that: it can be used as substitute for cement and flyash in concrete.
CN202110573657.7A 2021-05-25 2021-05-25 Regenerated cementing material based on subway shield sludge Active CN113264700B (en)

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CN103253883A (en) * 2013-04-15 2013-08-21 武汉理工大学 Cement concrete strength promoter and preparation method thereof
CN103319103A (en) * 2013-06-09 2013-09-25 河海大学 Regenerative hardened cement mortar gelling material and preparation method thereof

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CN103253883A (en) * 2013-04-15 2013-08-21 武汉理工大学 Cement concrete strength promoter and preparation method thereof
CN103319103A (en) * 2013-06-09 2013-09-25 河海大学 Regenerative hardened cement mortar gelling material and preparation method thereof

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