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Compound modified cement concrete internal-maintenance material and preparation method thereof

A technology of cement concrete and composite modification, applied in the field of building materials, can solve the problems of unfavorable early strength and impermeability performance of concrete, influence, reduction of concrete strength, etc., and achieves improvement of ion penetration resistance, durability and frost resistance. rising effect

Active Publication Date: 2017-12-08
西安华泽道路材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the curing effect of this method, it is usually necessary to add a large amount of light aggregate. Although the self-shrinkage of concrete will be greatly reduced, the strength of concrete will be reduced due to the addition of a large amount of light aggregate, and the water absorption of light aggregate is not good. The strength of regular concrete has great variation
Among them, the superabsorbent resin in the polymer material is the most concerned object, but because the current technology is limited, it will usually have an adverse effect on the early strength and impermeability of the concrete during use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This example provides a composite modified cement concrete internal curing material, by weight, including the following raw materials: 24% methyl acrylate, 13% aconitic acid, 6% 3-hydroxypropionic acid, 15% carboxylic acid Methyl cellulose, 20% hydrotalcite, 3% alunite powder, 0.006% polyvinyl alcohol, 0.004% glycerin, 0.25% initiator, 18.74% Ca(OH) 2 .

[0041] The preparation method of the composite modified cement concrete internal curing material includes the following steps:

[0042] Step 1: Weigh the above raw materials according to their quality;

[0043] Step 2: Place the weighed hydrotalcite-like material in a drying oven at 102°C for 24 hours.

[0044] Step 3: Put the dried hydrotalcite-like material in a muffle furnace, heat it to 500°C at a heating rate of 3°C / min, and keep it warm for 5 hours before natural cooling.

[0045] Step 4: Place the cooled hydrotalcite-like material in a container, add an appropriate amount of distilled water to prepare a 30% hydrotalcite-...

Embodiment 2

[0054] This example provides a composite modified cement concrete internal curing material, by weight, including the following raw materials: 26% methyl acrylate, 10% aconitic acid, 6% 3-hydroxypropionic acid, 13% carboxylic acid Methyl cellulose, 16% hydrotalcite, 1.5% alunite powder, 0.015% polyvinyl alcohol, 0.005% glycerin, 0.4% initiator, 27.08% Ca(OH) 2 .

[0055] The preparation method of the composite modified cement concrete internal curing material includes the following steps:

[0056] Step 1: Weigh the above raw materials according to their quality;

[0057] Step 2: Place the weighed hydrotalcite-like material in a drying oven at 102°C for 24 hours.

[0058] Step 3: Put the dried hydrotalcite-like material in a muffle furnace, heat it to 500°C at a heating rate of 3°C / min, and keep it warm for 5 hours before natural cooling.

[0059] Step 4: Place the cooled hydrotalcite-like material in a container, add an appropriate amount of distilled water to prepare a 30% hydrotalcite...

Embodiment 3

[0068] This example provides a composite modified cement concrete internal curing material, by weight, including the following raw materials: 25% methyl acrylate, 12% aconitic acid, 5% 3-hydroxypropionic acid, 14% carboxylate Methyl cellulose, 18% hydrotalcite, 2.2% alunite powder, 0.01% polyvinyl alcohol, 0.005% glycerin, 0.32% initiator, 23.465% Ca(OH) 2 .

[0069] The preparation method of the composite modified cement concrete internal curing material includes the following steps:

[0070] Step 1: Weigh the above raw materials according to their quality;

[0071] Step 2: Place the weighed hydrotalcite-like material in a drying oven at 102°C for 24 hours.

[0072] Step 3: Put the dried hydrotalcite-like material in a muffle furnace, heat it to 500°C at a heating rate of 3°C / min, and keep it warm for 5 hours before natural cooling.

[0073] Step 4: Place the cooled hydrotalcite-like material in a container, add an appropriate amount of distilled water to prepare a 30% hydrotalcite-li...

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Abstract

The invention provides a compound modified cement concrete internal-maintenance material and a preparation method thereof. The maintenance material is prepared by compounding inorganic hydrotalcite-like compounds with organic high water-absorbent resin through an intercalation modification technique. The material preparation by virtue of the preparation method has excellent water retention capacity, the shrinkage of concrete is reduced to a great extent, the compressive strengths in the days 7 and 28 are increased by above 10%, the relatively dynamic elasticity modulus after 300 freezing and thawing cycles is above 80%, the anti-freezing property is obviously improvided, and the chloride penetration resistance and sulfate corrosion resistance are remarkably improved.

Description

Technical field [0001] The invention belongs to the field of building materials, relates to a cement concrete internal curing material, in particular to a composite modified cement concrete internal curing material and a preparation method thereof. Background technique [0002] As the most used and irreplaceable building material, concrete is widely used in my country's highway and civil construction projects because of its high compressive strength, good durability and low price. At present, the curing technology used in most of the concrete projects in my country is external curing technology. This technology refers to curing technologies such as covering wet grass bags, plastic film, and direct water spraying on the surface of the concrete. This "outside-in" external curing technology will not only consume a lot of manpower, financial resources, and material resources, but especially for the current high-performance concrete with low water-binder ratio as its typical feature,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
CPCC04B40/0042C04B24/045C04B24/04C04B24/06C04B24/383C04B14/04C04B22/142C04B22/064C04B24/2623C04B24/02C04B22/085
Inventor 何锐谈亚文耿瑶陈华鑫龙景潭张豪
Owner 西安华泽道路材料有限公司
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