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Cement concrete modifying agent resistant to sulfate erosion and preparation method thereof

A technology of cement concrete and sulfate resistance, which is applied in the field of building materials to achieve the effects of improving the performance of sulfate corrosion resistance, significant filling effect, and large specific surface area

Inactive Publication Date: 2016-01-20
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a cement concrete sulfate corrosion resistance modifier and its preparation method. The present invention solves the technical problem of how to improve the sulfate corrosion resistance of cement concrete and comprehensively improve the durability of concrete

Method used

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  • Cement concrete modifying agent resistant to sulfate erosion and preparation method thereof
  • Cement concrete modifying agent resistant to sulfate erosion and preparation method thereof
  • Cement concrete modifying agent resistant to sulfate erosion and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention discloses a sulfate corrosion-resistant modifier for cement concrete, which is prepared from metakaolin, calcined hydrotalcite, fly ash and limestone powder. Metakaolin is calcined at 700°C for 4 hours and then cooled and pulverized. Calcined hydrotalcite is calcined at 500°C for 4 hours and then cooled. The ratio of modifiers used to modify the sulfate attack resistance of cement concrete is shown in Table 1.

[0025] Table 1 Proportion of cement concrete anti-sulfate attack modifier

[0026]

[0027] With reference to the provisions of GB / T749-2008 "Test Method for Resistance to Sulfate Erosion of Cement", the present invention uses cement concrete sulfate erosion resistance modifier combined with cement and dihydrate gypsum to prepare cement mortar test blocks, and the experimental water-cement ratio is 0.36 , The size of the test block is 25×25×280 mm. By adding a certain amount of dihydrate gypsum to the cement, the SO in the cement 3 The conten...

Embodiment 2

[0033] The invention discloses a sulfate corrosion-resistant modifier for cement concrete, which is prepared from metakaolin, calcined hydrotalcite, fly ash and limestone powder. Metakaolin is calcined at 700°C for 4 hours and then cooled and pulverized. Calcined hydrotalcite is calcined at 500°C for 4 hours and then cooled. According to numbers 3, 4, and 5 in Table 1, prepare cement concrete sulfate corrosion modifiers, and add them to cement concrete in proportions of 0, 5% and 10%, respectively. The cement concrete proportioning ratio is shown in Table 3.

[0034] Table 3 concrete mix ratio

[0035]

[0036]According to the method of GB / T50080-2002 "General Concrete Mixture Performance Test Method Standard", the slump of the concrete mixture was tested, and the test results are shown in Table 4.

[0037] Table 4 Concrete slump

[0038]

[0039] The test results show that the performance of the concrete mixed with the anti-sulphate corrosion modifier is not significa...

Embodiment 3

[0041] The invention discloses a sulfate corrosion-resistant modifier for cement concrete, which is prepared from metakaolin, calcined hydrotalcite, fly ash and limestone powder. Metakaolin is calcined at 700°C for 4 hours and then cooled and pulverized. Calcined hydrotalcite is calcined at 500°C for 4 hours and then cooled. According to No. 3, 4, and 5 in Table 1, prepare cement concrete sulfate corrosion modifiers, and add them to cement concrete in proportions of 5% and 10%, respectively. The proportion of cement concrete is shown in Table 3.

[0042] According to the method of GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the 3-day, 7-day and 28-day compressive strength of concrete was tested, and the test results are shown in Table 5.

[0043] Table 5 Concrete compressive strength test results

[0044]

[0045] The test results show that the compressive strength of the concrete mixed with the anti-sulfate corrosion modifier ...

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Abstract

The invention discloses a cement concrete modifying agent resistant to sulfate erosion and a preparation method thereof. The cement concrete modifying agent resistant to sulfate erosion is formed by mixing metakaolin, calcined hydrotalcite, fly ash and lime stone powder, wherein the admixture amount of the metakaolin is 50-70%, the admixture amount of the calcined hydrotalcite is 15-30%, the admixture amount of the fly ash is 10-20%, and the admixture amount of the lime stone powder is 0-10%. When metakaolin is doped in cement concrete, the metakaolin reacts with calcium hydroxide in cement hydrated products, a large amount of hydrated calcium silicate and hydrated calcium aluminate are generated, holes in the concrete is filled with the hydrated calcium silicate and the hydrated calcium aluminate, transfer of harmful sulfate ions in the concrete is delayed, and therefore the sulfate erosion resistance of the cement concrete is improved. According to the cement concrete modifying agent resistant to sulfate erosion, the sulfate erosion resistance and the compressive strength of the concrete can be remarkably improved at low admixture amount, and meanwhile the working performance of the concrete is not affected.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement concrete sulfate erosion-resistant modifier and a preparation method thereof. Background technique [0002] In recent years, the durability of cement concrete has been paid more and more attention, and the erosion damage caused by sulfate is one of the important factors affecting the durability of concrete. In my country, Northwest China, South China and coastal areas, there are a lot of saline soil and sulfate soil. At the same time, sea water, acid rain and industrial wastewater have also brought a lot of sulfate ions that are harmful to concrete. Abroad, Germany, Japan, Canada, the United States and other countries also have the phenomenon of sulfate corrosion of concrete structures, which has brought serious economic losses. Based on this, the concrete erosion damage caused by sulfate needs to be solved urgently. [0003] Sulfate attack of concrete is a ...

Claims

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Application Information

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IPC IPC(8): C04B22/10C04B103/61
Inventor 马军涛仝玉萍石艳柯王慧贤刘丽
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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