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A kind of low heat and high ductility cement-based composite material and preparation method thereof

A composite material, high ductility technology, applied in the direction of climate change adaptation, etc., can solve the problems of large amount of hydration heat release, temperature rise, large temperature difference between inside and outside of components, etc., to achieve low hydration heat release and simple preparation process. Effect

Active Publication Date: 2016-06-15
SINOMA INT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a high-ductility cement-based composite material is used to make a large-volume component, in the early stage of hydration, due to the large amount of material hydration heat release, the internal temperature of the component will rise sharply, resulting in a large temperature difference between the inside and outside of the component.
Since the mechanical properties (especially the tensile properties) of the material have not yet matured at this time, the huge internal and external temperature difference will cause serious cracks on the surface of the component, which will have a negative impact on the durability and mechanical properties of the material and structure.
Although high ductility cement-based composites have excellent tensile properties in the later stage, the above-mentioned early temperature cracks cannot be avoided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The weight ratio of high belite cement, fly ash, quartz stone powder, water, polycarboxylate high-performance water reducer, polyacrylic acid thickener, and polypropylene fiber is 24.97:33.30:24.97:14.98:0.42:0.10 :1.26.

[0030] Add the weighed cement, mineral admixture and fine aggregate into the mixer, dissolve the admixture into the water, then slowly add them into the mixing tank together, and stir for 3 minutes; sprinkle the fiber into the mixing tank, and then stir for 3 minutes. minute.

[0031] The 28-day compressive strength was 40.7MPa, and the 28-day tensile strength and ultimate elongation were 2.8MPa and 2.6%, respectively. The 3-day and 7-day hydration heat release of the present invention is only 75.7% and 72.4% of the hydration heat release of the high-ductility cement-based composite material prepared with ordinary portland cement with the same mix ratio.

Embodiment 2

[0033] The weight ratio of high belite cement, finely ground slag powder, limestone powder, water, polycarboxylate high-performance water reducer, polyacrylic acid thickener, and polyvinyl alcohol fiber is 24.55:24.55:32.74:16.37:0.45 :0.12:1.22.

[0034] Add the weighed cement, mineral admixture and fine aggregate into the mixer, dissolve the admixture into the water, then slowly add them into the mixing bucket together, and stir for 3 minutes; sprinkle the fiber into the mixing bucket, and then stir for 5 minutes. minute.

[0035] The 28-day compressive strength was 42.3MPa, and the 28-day tensile strength and ultimate elongation were 3.6MPa and 2.3%, respectively. The 3-day and 7-day hydration heat release of the present invention is only 77.2% and 75.9% of the hydration heat release of the high-ductility cement-based composite material prepared with ordinary Portland cement and the same mix ratio.

Embodiment 3

[0037] The weight ratio of high belite cement, fly ash, limestone powder, water, polycarboxylate high-performance water reducer, polyacrylic acid thickener, and polyvinyl alcohol fiber is 16.74:37.65:29.29:14.64:0.33: 0.13:1.21.

[0038] Add the weighed cement, mineral admixture and fine aggregate into the mixer, dissolve the admixture into the water, then slowly add them into the mixing bucket together, and stir for 3 minutes; sprinkle the fiber into the mixing bucket, and then stir for 5 minutes. minute.

[0039] The 28-day compressive strength was 31.8MPa, and the 28-day tensile strength and ultimate elongation were 3.1MPa and 3.2%, respectively. The 3-day and 7-day hydration heat release of the present invention is only 73.8% and 72.3% of the hydration heat release of the high-ductility cement-based composite material prepared with ordinary portland cement and the same mix ratio.

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Abstract

The invention provides a low-heat and high-ductility cement-based composite material, which is prepared from the following raw materials in parts by weight: 15-75 parts of cement, 0-80 parts of mineral admixture, 0-50 parts of fine aggregate, 8-25 parts of water, 0.6-2.5 parts of fiber and 0.25-2 parts of an admixture, wherein the cement is high belite cement. The high-ductility cement-based composite material provided by the invention is low in hydration heat and good in tensile property. The invention also provides a preparation method of the high-ductility cement-based composite material.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a cement-based composite material, a low-heat and high-ductility cement-based composite material prepared by using high belite cement, and a preparation method thereof. Background technique [0002] High-ductility cement-based composite material is a fiber-reinforced cement-based composite material, which exhibits high ductility under tensile, bending, and shear loads, and its ultimate elongation is as high as 2%, which is hundreds of times that of ordinary concrete and fiber concrete. Its invention and application have changed the traditional concept that "cement-based materials are quasi-brittle materials". High ductility cementitious composites exhibit multiple-cracking under axial tensile loading. In addition, the crack width of high ductility cement-based composite materials is small, the average crack width is less than 100 μm, and it does not increase with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00
CPCY02A30/30
Inventor 隋同波周健陈智丰张利俊李晋梅刘淼王彬吴晓丽李菁苗振伟
Owner SINOMA INT ENG