Low-shrinkage high-strength concrete and preparation method thereof

A high-strength, low-shrinkage technology, which is applied to clay preparation devices, chemical instruments and methods, and manufacturing tools, can solve problems such as large shrinkage, large shrinkage of ultra-high-strength concrete, and low concrete strength, so as to improve shrinkage resistance and uniformity. Dispersion acceleration, low dosage effect

Active Publication Date: 2020-11-17
深圳市利建新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although ultra-high-strength concrete has many advantages, it also has some disadvantages due to its own characteristics; The shrinkage of high-strength concrete is large, which can reach more than ten thousandths, and it mostly occurs in the early age, resulting in a higher probability of early cracking than ordinary concrete; on the other hand, as the compressive strength of concrete continues to increase, its brittleness gradually increase, which to some extent restricts the application of ultra-high-strength concrete in engineering
[0005] Patent CN107721287B discloses a diatomite modified concrete and its preparation method, which is made by mixing cement, diatomite, water, river sand, gravel, water reducer, etc., although it solves the problem of large early shrinkage of high-strength concrete problems (shrinkage resistance is not excellent), but the strength of concrete is low

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  • Low-shrinkage high-strength concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]A preparation method of low-shrinkage, high-strength concrete, the specific steps are as follows:

[0042] (1) First mix 1kg cement, 1.5kg river sand and 0.3kg petroleum coke powder evenly to obtain mixed dry material;

[0043] (2) Then 0.3kg vermiculite powder and 0.6kg mineral powder are added in 0.8kg water, activated, and ball milled to obtain the premix;

[0044] (3) Then pour the mixed dry material into the premix, stir and mix, then add 0.2kg of fiber gel composite material, 1.8kg of light aggregate and 0.01kg of admixture, and stir to obtain a slurry;

[0045] (4) Finally, inject the slurry into the mold, vibrate and form it, and then maintain it to obtain a low-shrinkage, high-strength concrete;

[0046] Wherein, the fiber gel composite material is prepared from glucono δ-lactone, allylamine and acrylamide through polymerization reaction, and polyethersulfone-polyamide fiber and polyamide fiber are added during the polymerization reaction. Acrylonitrile fibers...

Embodiment 2

[0064] A preparation method of low-shrinkage, high-strength concrete, the specific steps are as follows:

[0065] (1) First mix 1kg cement, 2kg river sand and 0.2kg petroleum coke powder evenly to obtain mixed dry material;

[0066] (2) Then add 0.5kg vermiculite powder and 0.4kg mineral powder into 1kg water, activate, and ball mill to obtain the premix;

[0067] (3) Then pour the mixed dry material into the premix, stir and mix, then add 0.1kg of fiber gel composite material, 2.2kg of light aggregate and 0.008kg of admixture, and stir to obtain a slurry;

[0068] (4) Finally, inject the slurry into the mold, vibrate and form it, and then maintain it to obtain a low-shrinkage, high-strength concrete;

[0069] Wherein, the fiber gel composite material is prepared from glucono δ-lactone, allylamine and acrylamide through polymerization reaction, and polyethersulfone-polyamide fiber and polyamide fiber are added during the polymerization reaction. Acrylonitrile fibers to form ...

Embodiment 3

[0087] A preparation method of low-shrinkage, high-strength concrete, the specific steps are as follows:

[0088] (1) First mix 1kg cement, 1.8kg river sand and 0.25kg petroleum coke powder evenly to obtain mixed dry material;

[0089] (2) Then 0.4kg vermiculite powder and 0.5kg mineral powder are added in 0.9kg water, activated, and ball milled to obtain the premix;

[0090] (3) Then pour the mixed dry material into the premix, stir and mix, then add 0.15kg of fiber gel composite material, 2kg of light aggregate and 0.009kg of admixture, and stir to obtain a slurry;

[0091] (4) Finally, inject the slurry into the mold, vibrate and form it, and then maintain it to obtain a low-shrinkage, high-strength concrete;

[0092] Wherein, the fiber gel composite material is prepared from glucono δ-lactone, allylamine and acrylamide through polymerization reaction, and polyethersulfone-polyamide fiber and polyamide fiber are added during the polymerization reaction. Acrylonitrile fibe...

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Abstract

The invention relates to low-shrinkage high-strength concrete and a preparation method thereof. The method comprises the following steps: uniformly mixing cement, river sand and petroleum coke powderto obtain a mixed dry material; adding vermiculite powder and mineral powder into water, activating and ball-milling to obtain a premix; pouring the mixed dry material into the premix, uniformly stirring and mixing, adding a fiber gel composite material, light aggregate and an additive, and uniformly stirring to obtain slurry; finally, injecting the slurry into a mold, vibrating, forming and curing to obtain the low-shrinkage high-strength concrete. The high strength and the low shrinkage of the product are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a low-shrinkage, high-strength concrete and a preparation method thereof. Background technique [0002] Concrete is widely used in the field of construction as the main building material. In recent years, with the development of modern buildings towards high-rise, long-span, lightweight and harsh environment areas (cold areas, saline-alkali areas), people have higher and higher requirements for concrete strength. Therefore, it is important to develop high-strength and high-performance concrete. Practical significance. [0003] Due to its high strength, high corrosion resistance and durability, high-strength high-performance concrete can reduce the size of the structure, reduce the weight of the structure, save land, reduce energy consumption, reduce structural maintenance costs and reconstruction costs, etc., and its technical development has become the focus of the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04B28B1/04B28B1/52B28C5/40C08F220/56C08F226/02D01F8/12D01F8/16
CPCC04B28/04B28B1/045B28B1/525B28C5/402C08F220/56D01F8/12D01F8/16C04B2201/50C04B14/06C04B14/022C04B14/202C04B14/02C04B24/2688C04B16/0658C04B16/0691C04B16/06C04B16/0675C04B14/106C04B14/365C04B18/0427C04B18/141C04B24/18C04B24/122C04B24/32C08F226/02
Inventor 崔耀春
Owner 深圳市利建新材料有限公司
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