High-strength anti-crack concrete and preparation method thereof

A concrete and high-strength technology, applied in the field of high-strength crack-resistant concrete and its preparation, can solve problems such as low bonding strength and insufficient hydration, improve crack resistance and overall strength, increase overall strength, and reduce the risk of cracking Effect

Active Publication Date: 2020-04-03
中建商品混凝土江西有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relevant studies have shown that at the interface between plastic particles and cement stone, the hydration is insufficient and the bonding strength is low.

Method used

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  • High-strength anti-crack concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The invention provides a lightweight ultra-high-strength concrete and a preparation method thereof.

[0049] A high-strength crack-resistant concrete, in parts by weight, comprising the following raw materials:

[0050] General portland cement, 460 parts;

[0051] Fly ash, 50 parts;

[0052] Silica fume, 40 parts;

[0053] Coarse aggregate, 1050 parts;

[0054] Fine aggregate, 580 parts;

[0055] Modified waste ABS plastic particles, 140 parts;

[0056] Modified zeolite powder, 50 parts

[0057] Polypropylene fiber, 0.6 part;

[0058] Polycarboxylate superplasticizer, 15.5 parts;

[0059] Water-binder ratio, 0.25.

[0060] in:

[0061] Portland cement is ordinary Portland cement with a strength of 42.5 MPa.

[0062] Fly ash is superfine fly ash with an average particle size of 2.7 μm.

[0063] The specific surface area of ​​silica fume is ≥20000m 2 / kg, average particle size 0.14μm.

[0064] Coarse aggregate is 5-25mm continuous graded crushed stone.

[0065...

Embodiment 2

[0076] Provided are a lightweight ultra-high-strength concrete and a preparation method thereof.

[0077] A high-strength crack-resistant concrete, in parts by weight, comprising the following raw materials:

[0078] General portland cement, 480 parts;

[0079] Fly ash, 60 parts;

[0080] Silica fume, 50 parts;

[0081] Coarse aggregate, 1050 parts;

[0082] Fine aggregate, 590 parts;

[0083] Modified waste ABS plastic particles, 150 parts;

[0084] Modified zeolite powder, 60 parts

[0085] Polypropylene fiber, 0.7 part;

[0086] Polycarboxylate superplasticizer, 16.2 parts;

[0087] Water-binder ratio, 0.23.

[0088] in:

[0089] Portland cement is ordinary Portland cement with a strength of 42.5 MPa.

[0090] Fly ash is superfine fly ash with an average particle size of 2.9 μm.

[0091] The specific surface area of ​​silica fume is ≥20000m 2 / kg, average particle size 0.17μm.

[0092] Coarse aggregate is 5-25mm continuous graded crushed stone.

[0093] Fine a...

Embodiment 3

[0104] The invention provides a lightweight ultra-high-strength concrete and a preparation method thereof.

[0105] A high-strength crack-resistant concrete, in parts by weight, comprising the following raw materials:

[0106] General portland cement, 500 parts;

[0107] Fly ash, 60 parts;

[0108] Silica fume, 50 parts;

[0109] Coarse aggregate, 1150 parts;

[0110] Fine aggregate, 580 parts;

[0111] Modified waste ABS plastic particles, 160 parts;

[0112] Modified zeolite powder, 50 parts

[0113] Polypropylene fiber, 0.8 parts;

[0114] Polycarboxylate superplasticizer, 16.9 parts;

[0115] Water-binder ratio, 0.20.

[0116] in:

[0117] Portland cement is ordinary Portland cement with a strength of 42.5 MPa.

[0118] Fly ash is superfine fly ash with an average particle size of 3.1 μm.

[0119] The specific surface area of ​​silica fume is ≥20000m 2 / kg, with an average particle size of 0.19 μm.

[0120] Coarse aggregate, 5-25mm continuous graded crushed st...

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Abstract

The invention relates to high-strength anti-crack concrete and a preparation method thereof. The high-strength anti-crack concrete comprise, by weight, 450-500 parts of cement, 40-60 parts of fly ash,30-50 parts of silica fume, 1050-1150 parts of coarse aggregate, 580-600 parts of fine aggregate, 140-160 parts of modified waste ABS plastic particles, 40-60 parts of modified zeolite powder, 0.5-0.9 parts of polypropylene fibers and 15.4-17.1 parts of a polycarboxylate superplasticizer, and a water-binder ratio is 0.20 to 0.25. The high-strength anti-cracking concrete provided by the inventionhas the advantages of small internal shrinkage stress, high overall strength, obvious shrinkage reduction effect, excellent anti-cracking performance, simple preparation method, cheap and easily available raw materials, utilization of waste materials and high environmental protection benefit.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-strength crack-resistant concrete and a preparation method thereof. Background technique [0002] High-strength concrete has high compressive strength, high density and low porosity, and is widely used in high-rise building structures, long-span bridge structures and some special structures. However, high-strength concrete has large autogenous shrinkage in the early stage and large drying shrinkage in the later stage, and is easy to crack. In order to reduce the shrinkage of high-strength concrete and maximize the hydration degree of the cementitious material, internal curing agents, expansion agents, and anti-cracking fibers are generally used to solve the problem. , but as an important admixture, the expansion agent needs to adjust the dosage and ratio due to the difference in the development of concrete strength, which is difficult to control. [0003] Shr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2111/343C04B2201/50C04B18/08C04B18/146C04B18/12C04B14/068C04B18/20C04B14/047C04B16/0633C04B24/24
Inventor 黄暑年王军赵日煦张恒春黄汉洋代飞
Owner 中建商品混凝土江西有限公司
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