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Concrete freeze-thaw-resistant composite protective agent and preparation method thereof

A freeze-thaw resistance, protective agent technology, applied in biochemical equipment and methods, microorganism-based methods, immobilized on/in organic carriers, etc., can solve the problem of inability to further improve mechanical strength, general concrete performance, molecular structure Small problems, to achieve good compatibility and chemical stability, improve anti-freeze-thaw effect, prolong the effect of survival

Inactive Publication Date: 2021-04-02
杨华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Osmotic type usually uses organosilicon-type osmotic protective agent, the molecular structure is small and simple, it can penetrate into the concrete capillary wall and cement hydration product to form a layer of air-permeable hydrophobic film through bonding reaction, and then play waterproof and antifreeze However, the penetrating protective agent can only prevent further damage to the concrete, but cannot repair the existing local damage and cracks, and cannot further improve its mechanical strength. The effect is single
[0004] The Chinese patent with the publication number CN111056782A discloses a microbial self-repair method for tunnel lining concrete cracks. The microbial repair agent is added to the concrete raw materials to prepare the tunnel lining concrete, which can be repaired after the concrete cracks, but the repaired The performance of concrete in the freeze-thaw cycle test is average, and the strength drops a lot

Method used

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  • Concrete freeze-thaw-resistant composite protective agent and preparation method thereof
  • Concrete freeze-thaw-resistant composite protective agent and preparation method thereof
  • Concrete freeze-thaw-resistant composite protective agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]A concrete anti-freeze-thaw composite protective agent, weigh 90g of silica sol, 10g of methyltriethoxysilane, 3g of Span S-80 and 2g of SOPE-10, respectively, add them to a conical flask at 26°C, and stir Until the mixture is uniform; weigh 2g of silane coupling agent KH550, add it into the Erlenmeyer flask under stirring, continue to stir for 20min until the solution is uniform, then slowly add 0.2g of n-octylamine dropwise, and stir until a transparent and stable sol is obtained; under stirring Add deionized water at 60°C to the sol, and continue stirring for 1 hour to obtain the primary protective agent.

[0049] Microbial self-healing agents are made by the following steps:

[0050] S1: Weigh the following raw materials: 3g peptone, 2g beef extract, 1g sucrose and 94g urea; add peptone and beef extract to 1L deionized water to prepare medium 1;

[0051] S2: adjust its pH to 7.0, put it in a Erlenmeyer flask, autoclave at 130°C for 30 minutes, take it out and dry it...

Embodiment 2-3

[0056] Examples 2-3 relate to a concrete antifreeze-thaw composite protective agent, all of which are based on Example 1, and the only difference is that the amount of the microbial self-healing agent is different during the preparation process, see Table 2 for details.

[0057] Table 2 Example 2-3

[0058] Example Amount of microbial self-healing agent / g Example 2 20 Example 3 22

Embodiment 4-6

[0060] Examples 4-6 relate to a concrete antifreeze-thaw composite protective agent, all of which are based on Example 1. The only difference lies in the selection of raw materials and the amount of raw materials used in the preparation process. See Table 3 for details.

[0061] Table 3 Example 4-6

[0062]

[0063]

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Abstract

The invention relates to the field of concrete protection, and particularly discloses aconcrete freeze-thaw-resistant composite protective agent and a preparation method of the freeze-thaw-resistant composite protective agent. The concrete freeze-thaw-resistant composite protective agent is prepared from the following raw materials: silica sol, alkyl siloxane, a silane coupling agent, n-octylamine, a nonionic emulsifier and a microbial self-repairing agent. The preparation method comprises the following steps: preparing raw materials in proportion, and uniformly mixing the silica sol, the alkyl siloxane and the nonionic emulsifier to obtain a primary mixed solution; adding the silane coupling agent into the primary mixed solution, uniformly stirring, dropwise adding the catalyst n-octylamine, and continuously stirring until transparent and stable sol is obtained; adding water into the sol in a stirring state, and stirring to obtain an emulsion mixed solution; and mixing the mixed solution with the microbial self-repairing agent, and uniformly stirring to obtain the freeze-thaw-resistant composite protective agent. The composition can be used for freeze-thaw resistance protection ofconcrete, and has the advantages of improving the freeze-thaw resistance of the concrete and repairing the column fraction of the concrete.

Description

technical field [0001] The present application relates to the field of concrete protection, more specifically, it relates to a concrete freeze-thaw anti-composite protective agent and a preparation method thereof. Background technique [0002] Concrete is widely used in civil engineering such as buildings, bridges, and roads because of its low cost, easy pouring, and high compressive strength after hardening. It is one of the most widely used and indispensable building materials in modern society. However, under certain environments, such as seawater erosion in coastal areas, erosion of deicing salt sprinkled on roads after snow in the Three North Areas, freeze-thaw damage, etc., concrete will seriously affect its service life and operational safety. In order to solve this problem and prolong the service life of concrete, the protection of concrete materials is particularly important. [0003] Concrete surface coated with protective paint is the main protective measure of r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/65C09D183/04C09D7/63C09D7/65C12N1/20C12N11/10C12R1/07
CPCC04B41/65C04B41/5089C09D183/04C09D7/63C09D7/65C12N1/20C12N11/10
Inventor 杨华
Owner 杨华
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