Green cement-based composite material with low shrinkage and high ductility

A technology of green cement and composite materials, applied in the field of construction engineering materials, can solve the problems of high cost, poor brittleness and ductility, low shrinkage and ductility, etc., and achieve the effect of solving high cost, low shrinkage and high ductility.

Pending Publication Date: 2019-08-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problems of brittleness and poor ductility of traditional concrete materials, and the high cost of traditional ECC. Compared with traditional ECC materials, its material cost and shrinkage resistance have greater advanta

Method used

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  • Green cement-based composite material with low shrinkage and high ductility

Examples

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Effect test

Embodiment 1

[0021] Example 1: 50 parts of cement, 30 parts of fly ash, 15 parts of granulated blast furnace slag, 15 parts of metakaolin, 0.2 part of polycarboxylate superplasticizer, 9 parts of calcium sulfoaluminate expansion agent, dispersible latex 0.3 parts of powder, 0.3 parts of defoamer, 50 parts of sand, 32 parts of water, wherein the hydrophilic polyvinyl alcohol fiber is 0.3% of the total mass. The shrinkage strain of the green cement-based composite material prepared in this example is 1003με, the compressive strength is 54MPa, and the flexural strength is 11.57MPa.

Embodiment 2

[0022] Example 2: 50 parts of cement, 30 parts of fly ash, 15 parts of granulated blast furnace slag, 15 parts of metakaolin, 0.2 part of polycarboxylate superplasticizer, 9 parts of calcium sulfoaluminate expansion agent, dispersible latex 0.3 parts of powder, 0.3 parts of defoamer, 45 parts of sand, 32 parts of water, wherein the hydrophilic polyvinyl alcohol fiber is 0.9% of the total mass. As shown in Tables 1, 2, and 3, the shrinkage strain of the green cement-based composite material prepared in this example is 935με, the compressive strength is 46.1MPa, and the flexural strength is 23.65MPa.

Embodiment 3

[0023] Example 3: 50 parts of cement, 30 parts of fly ash, 15 parts of granulated blast furnace slag, 15 parts of metakaolin, 0.2 part of polycarboxylate superplasticizer, 9 parts of calcium sulfoaluminate expansion agent, dispersible latex 0.3 parts of powder, 0.3 parts of defoamer, 40 parts of sand, 32 parts of water, wherein the hydrophilic polyvinyl alcohol fiber is 1.5% of the total mass. As shown in Tables 1, 2, and 3, the shrinkage strain of the green cement-based composite material prepared in this example is 869με, the compressive strength is 45.86MPa, and the flexural strength is 19.77MPa.

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Abstract

The invention discloses a green cement-based composite material with low shrinkage and high ductility, and the green cement-based composite material mainly comprises cement, fly ash, industrial wasteresidue, metakaolin, machine-made sand, hydrophilic polyvinyl alcohol fiber, additives and water. According to the invention, the green cement-based composite material with shrinkage strain less than1050 mu epsilon, compressive strength greater than 45mpa and flexural strength greater than 10 MPa is prepared by optimizing the basic mixture ratio.

Description

technical field [0001] The invention belongs to the field of building engineering materials, in particular to a green cement-based composite material with low shrinkage and high ductility. Background technique [0002] Due to the shortcomings of ordinary concrete materials such as high brittleness and easy cracking, during the service process of road and bridge engineering, such as expansion joints, wet joints and bridge deck pavement, often due to the poor ductility of concrete materials, the ultimate tensile strain is low, Insufficient impact resistance and poor fatigue performance make the structure or components easy to be damaged under load, seriously affecting the safety and aesthetics of the structure. [0003] Although the incorporation of fibers (or polymers) can improve the toughness of the matrix to a certain extent, the expansion of macroscopic cracks after crack initiation cannot be effectively controlled, and the failure mode of the material still shows obvious...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/08C04B18/141C04B14/106C04B14/06C04B2103/302C04B22/142C04B2103/50C04B2103/0057C04B16/0641
Inventor 黄志义陈文华张伟
Owner ZHEJIANG UNIV
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