Modifier for cement concrete and method for improving performance of cement concrete

A technology of cement concrete and modifier, which is applied in the field of improving the performance of cement concrete. It can solve the problems of poor permeability, reduce the performance of cement or concrete, etc., and achieve the effects of reducing water absorption, inhibiting entry and erosion, and improving flexural resistance.

Inactive Publication Date: 2015-04-01
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silica sol can be prepared by acid catalysis or alkali catalysis, but because there are more alkaline substances in cement or concrete, at present, when silica sol is used to protect cement or concrete, alkali catalysis is used. Form silica sol to prevent acid from reacting with alkaline substances in cement or concrete, reducing the performance of cement or concrete
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Method used

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  • Modifier for cement concrete and method for improving performance of cement concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Mix 20 mL of tetraethyl orthosilicate, 11 mL of water, and 80 mL of ethanol, add acetic acid to adjust the pH of the above solution to 3.8, stir for 1 h, and obtain transparent SiO 2 Sol, that is, modifier.

[0038] Take six identical mortar test blocks with an age of 20 days and a water-cement ratio of 0.6, three of which are not treated as the control group, and the other three as the experimental group, and are treated as follows: soak in the above sol 3 h, take it out.

[0039] The test blocks of the experimental group and the control group were tested for absorption rate and mechanical properties, and the calculated data were averaged. The water absorption test results show that the water absorption of the test block modified by the modifier (experimental group) is 67% lower than that of the untreated (control group) after being placed in water for 150 minutes, indicating that the modifier effectively forms a protective layer , can hinder the erosion of external ...

Embodiment 2

[0041] Mix 20 mL tetrabutyl orthosilicate, 6 mL water, and 110 mL ethanol evenly, add oxalic acid to adjust the pH of the above solution to 3.6, stir for 1 h, and obtain transparent SiO 2 Sol, that is, modifier.

[0042] Take six identical mortar test blocks with an age of 30 days and a water-cement ratio of 0.6, three of which are not treated as the control group, and the other three as the experimental group, and are treated as follows: use the above sol for coating Brush, the frequency of brushing is 8 min / time, the time of brushing is 5 h, take it out.

[0043] The test blocks of the experimental group and the control group were tested for absorption rate and mechanical properties, and the calculated data were averaged. The water absorption test results show that the water absorption of the test block modified by the modifier is 55% lower than that of the untreated test block after being placed in water for 150 minutes, indicating that the modifier effectively forms a pro...

Embodiment 3

[0045] Mix 20 mL tetrapropyl orthosilicate, 1.8 mL water, and 150 mL ethanol evenly, add oxalic acid to adjust the pH of the above solution to 3.4, stir for 2 h, and obtain transparent SiO 2 Sol, that is, modifier.

[0046] Take six identical mortar test blocks with an age of 20 days and a water-cement ratio of 0.6, three of which are not treated as the control group, and the other three as the experimental group, and are treated as follows: soak in the above sol 1.5 h, take it out.

[0047] The test blocks of the experimental group and the control group were tested for absorption rate and mechanical properties, and the calculated data were averaged. The water absorption test results show that after 150 minutes in water, the water absorption of the test block modified by the modifier is 57% lower than that of the untreated block, indicating that the modifier effectively forms a protective layer, which can hinder the erosion of external corrosive media . The test results of ...

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Abstract

The invention discloses a modifier for cement concrete and a method for improving performance of the cement concrete. The modifier is silicon dioxide sol obtained by partial hydrolysis of orthosilicate. The modifier can be coated on the surface of a cement concrete material after molding, thereby modifying and curing the cement concrete. According to the modifier disclosed by the invention, a weak acid is used as a catalyst, thereby realizing partial hydrolysis of orthosilicate to form the network-like transparent sol with a very small size, being very easy to infiltrate into cement, mortar and concrete, simultaneously preventing a strong acid from damaging the cement and the concrete and finally forming a protective layer capable of inhibiting an external corrosive medium from entering and eroding. The sol is simple in preparation process, few in raw materials for composition, convenient to operate, low in cost and significant in effects, can be widely applied to modification of cement, mortar and concrete materials, and has important significance for early prevention and later maintenance of the cement, mortar and concrete.

Description

technical field [0001] The invention relates to a modifier suitable for cement concrete and a method for using the modifier to improve the performance of cement concrete. Background technique [0002] Cement, mortar and concrete are mixtures of various materials with a certain porosity, and are often damaged by the erosion of the external environment during use, such as chloride ion erosion, sulfate damage, and carbonation damage. Treating the surface of cement, mortar and concrete is the most commonly used protective measure, mainly to form a protective layer on the surface to inhibit the entry of external corrosive media and resist erosion. At present, there are some researches on applied technologies at home and abroad, such as patent CN 02136959.3 which discloses a permeable concrete protective agent and its preparation method, which uses sodium silicate hydrate as the main agent, and adds an excitation accelerator, and mixes it. Another example is the patent CN 2006100...

Claims

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Application Information

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IPC IPC(8): C04B41/49
Inventor 程新王丹杨萍
Owner UNIV OF JINAN
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