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PVA fiber reinforced cement-based composite material

A fiber-reinforced cement and composite material technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., to achieve high durability, improve tensile strain resistance, and improve connection characteristics

Pending Publication Date: 2021-04-09
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the toughness of cement-based materials, it is still a major technical measure to add fibers to cement mortar and concrete. Traditional fiber concrete alleviates this brittleness to a certain extent, which makes the tensile strength and deformation of concrete The ability to withstand dynamic loads has been greatly improved, but its tensile stress and strain curves still show softening characteristics

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0013] The invention provides the following technical solutions: a PVA fiber reinforced cement-based composite material, in terms of mass percentage: including 18-23% of cement, 60-67% of fly ash, 10-15% of tailings sand, and 1.7-2.1% of PVA fiber , Waterproofing agent 6-7.5%, mastic 0.8-1.0%, water 13-15%, water reducing agent 0.35-0.6%, thickener 0.03-0.05%, defoamer 0.03-0.05%.

[0014] In the above scheme, the following mass percentages are adopted: 20% cement, 65% fly ash, 10% tailings sand, 1.8% PVA fiber, 6% waterproofing agent, 0.8% sand glue, 13% water, 0.4% water reducing agent, Thickener 0.03%, defoamer 0.03%.

[0015] First weigh the water reducer and defoamer and place them in water to dissolve together to obtain the first mixture, then weigh the cement, fly ash and tailings sand and perform dry stirring for 10 minutes to obtain the second mixture. Then add the first mixture to the second mixture and carry out wet stirring for 10 minutes to obtain the third mixtu...

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PUM

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Abstract

The invention discloses a PVA fiber reinforced cement-based composite material, and relates to the technical field of fiber reinforced cement-based composite materials, wherein the PVA fiber reinforced cement-based composite material comprises the used main materials in percentage by mass: 18-23% of cement, 60-67% of fly ash, 10-15% of tailing sand, 1.7-2.1% of PVA fibers, 6-7.5% of a waterproof agent, 0.8-1.0% of sand glue, 13-15% of water, 0.35-0.6% of a water reducer, 0.03-0.05% of a thickening agent, and 0.03-0.05% of a defoaming agent. The fly ash replaces 2 / 3 of cement, so that the mixture has better cohesive force, the surface of the PVA fiber is coated with an oil agent, the tensile strain resistance of the PVA fiber can be improved, the connection characteristic of the matrix strength and the PVA fiber is improved, and a structural member is certainly endowed with higher durability.

Description

technical field [0001] The invention relates to the technical field of fiber-reinforced cement-based composite materials, in particular to a PVA fiber-reinforced cement-based composite material. Background technique [0002] At present, cement-based composite materials are still important building materials used by human society, and expectations for such materials are getting higher and higher, requiring light weight, high strength, high toughness, high durability, and beautiful appearance. [0003] Concrete and cement matrix materials are multi-phase composite materials. Before loading, due to shrinkage, bleeding and aggregate sinking, micro-cracks that are invisible to the naked eye are generated inside. Under the external load, micro-cracks are continuously generated, It expands and merges with other congenital defects such as pores and cavities, resulting in a large stress concentration, which becomes the root cause of concrete failure. Macroscopically, the tensile stre...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B20/10C04B18/08C04B16/06C04B111/20
CPCC04B20/1018C04B28/00C04B2111/20C04B2201/50C04B18/08C04B18/12C04B16/0641C04B2103/65C04B2103/44C04B2103/50Y02W30/91
Inventor 任皓文
Owner WUHAN UNIV OF SCI & TECH
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