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High-performance concrete with low shrinkage

A technology of high-performance concrete and shrinkage, which is applied in the field of building materials, can solve the problems of large self-shrinkage, restricting the development and application of ultra-high performance concrete, etc. The effect of hydration volume shrinkage

Pending Publication Date: 2022-01-28
JIANGSU DONGZHAO CONSTR IND INNOVATION & DEV RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shrinkage and cracking of concrete during pouring and curing still exists in ultra-high-performance concrete, especially ultra-high-performance concrete has the characteristics of large amount of cement and low water-cement ratio, followed by high hydration heat release and autogenous shrinkage. Large, its early shrinkage cracking is more serious than that of ordinary concrete, which greatly restricts the development and application of ultra-high performance concrete

Method used

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  • High-performance concrete with low shrinkage

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Experimental program
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Effect test

Embodiment 1

[0030] The present embodiment provides a low-shrinkage high-performance concrete, comprising: 210 parts of cement clinker; 100 parts of modified metakaolin; 30 parts of anhydrite powder; 400 parts of crushed stone; coal ash powder 150 parts; 600 parts of sand; 75 parts of mixed fiber; 13 parts of polycarboxylate superplasticizer; 100 parts of unsaturated polyester resin, 20 parts of admixture; 200 parts of water;

[0031] Among them, the cement clinker powder is mixed with Portland cement clinker powder and high expansibility Belite sulfoaluminate cement clinker powder in a mass ratio of 3:1, and the Portland cement clinker powder is made of ordinary Portland cement The clinker is ground to a specific surface area of ​​385m 2 / kg, high expansibility Belite sulfoaluminate cement clinker powder is high expansibility Belite sulfoaluminate cement clinker ground to a specific surface area of ​​500m 2 / kg get;

[0032] The crushed stone is made by mixing small crushed stones and l...

Embodiment 2

[0039] This embodiment provides a kind of high-performance concrete with low shrinkage, comprising: 150 parts of cement clinker powder; 150 parts of modified metakaolin; 40 parts of anhydrite powder; 300 parts of crushed stone; coal ash powder 180 parts; 680 parts of sand; 90 parts of mixed fiber; 17 parts of polycarboxylate superplasticizer; 180 parts of unsaturated polyester resin, 26 parts of admixture; 260 parts of water;

[0040] Among them, the cement clinker powder is mixed with Portland cement clinker powder and high expansibility Belite sulfoaluminate cement clinker powder in a mass ratio of 3:1, and the Portland cement clinker powder is made of ordinary Portland cement The clinker is ground to a specific surface area of ​​400m 2 / kg to obtain high expansibility Belit sulfoaluminate cement clinker powder, which is ground to a specific surface area of ​​470m 2 / kg get;

[0041] The crushed stone is made by mixing small crushed stones and large crushed stones of two d...

Embodiment 3

[0048] The present embodiment provides a low-shrinkage high-performance concrete, comprising: 260 parts of cement clinker; 150 parts of modified metakaolin; 50 parts of anhydrite powder; 500 parts of crushed stone; coal ash powder 220 parts; 750 parts of sand; 100 parts of mixed fiber; 22 parts of polycarboxylate superplasticizer; 180 parts of unsaturated polyester resin, 33 parts of admixture; 320 parts of water;

[0049] Among them, the cement clinker powder is mixed with Portland cement clinker powder and high expansibility Belite sulfoaluminate cement clinker powder at a mass ratio of 4:1, and the Portland cement clinker powder is made of ordinary Portland cement The clinker is ground to a specific surface area of ​​410m 2 / kg obtained, high expansibility Belite sulfoaluminate cement clinker powder is high expansibility Belite sulfoaluminate cement clinker ground to a specific surface area of ​​520m 2 / kg get;

[0050] The crushed stone is made by mixing small crushed st...

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Abstract

The invention relates to high-performance concrete with low shrinkage. The high-performance concrete is prepared from the following components in parts by mass: 150-260 parts of cement clinker powder; 100 to 150 parts of modified metakaolin; 30 to 50 parts of anhydrite powder; 300 to 500 parts of broken stone; 150 to 220 parts of coal ash powder; 600 to 750 parts of sand; 75 to 100 parts of mixed fiber; 13-22 parts of a polycarboxylic acid water reducing agent; 100 to 180 parts of unsaturated polyester resin, 20 to 33 parts of an additive; and 150 to 320 parts of water. According to the invention, various mechanical properties of the concrete are improved, the freeze-thaw resistance of the concrete is effectively improved, and the preparation cost of the concrete is reduced.

Description

technical field [0001] The invention relates to the technical field of building materials in civil engineering, in particular to a high-performance concrete with low shrinkage. Background technique [0002] Compared with ordinary concrete, ultra-high performance concrete has made great progress in mechanical properties and durability, but it still has the inherent defects of concrete itself. The shrinkage and cracking of concrete during pouring and curing still exists in ultra-high-performance concrete, especially ultra-high-performance concrete has the characteristics of large amount of cement and low water-cement ratio, followed by high hydration heat release and autogenous shrinkage. Large, its early shrinkage cracking is more serious than that of ordinary concrete, which greatly restricts the development and application of ultra-high performance concrete. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the ...

Claims

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Application Information

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IPC IPC(8): C04B28/16C04B111/34
CPCC04B28/16C04B2201/50C04B2111/343C04B7/02C04B7/32C04B14/106C04B18/08C04B14/06C04B24/283C04B14/48C04B14/46C04B16/0633C04B16/0641C04B14/048
Inventor 孙峰王现伟王恩赐吕新
Owner JIANGSU DONGZHAO CONSTR IND INNOVATION & DEV RES INST CO LTD
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