Special-shaped polyvinyl alcohol fiber reinforced cement-based composite material and preparation method thereof

A technology of polyvinyl alcohol fibers and composite materials, which is applied in the direction of fiber treatment, fiber chemical characteristics, single-component synthetic polymer rayon, etc., can solve the problems of durability and mechanical properties, and achieve the improvement of spinnability, The effect of good shape retention and small change in shear degree

Pending Publication Date: 2020-05-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a special-shaped polyvinyl alcohol fiber-reinforced cement-based composite material and its preparation method, so as to solve the problem of difficulty in improving the durability and mechanical properties of existing cement-based materials

Method used

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  • Special-shaped polyvinyl alcohol fiber reinforced cement-based composite material and preparation method thereof
  • Special-shaped polyvinyl alcohol fiber reinforced cement-based composite material and preparation method thereof
  • Special-shaped polyvinyl alcohol fiber reinforced cement-based composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The special-shaped polyvinyl alcohol fiber reinforced cement-based composite material of this embodiment includes the following raw materials: cement, quartz sand, water reducing agent, special-shaped polyvinyl alcohol fiber and water, wherein the water-sand ratio is 1:1.8; the water-cement ratio is 0.4:1; Polyalkylene glycol monoacrylate water reducing agent is used, and the mixing amount is 0.1% by weight of water; the volume mixing amount of special-shaped polyvinyl alcohol fiber is 0.5% of the total volume of the composite material.

[0041] Among them, in the preparation of the special-shaped polyvinyl alcohol fiber, the special-shaped spinneret micropores of the spinneret adopt a four-lobe type, and the degree of irregularity is 50%. It includes the following steps:

[0042] (I) The chemically modified polyvinyl alcohol powder is melt-spun on extrusion-spinning equipment, and after melt-extrusion, filtration and metering, it is ejected from the micro-holes of the speci...

Embodiment 2

[0050] The special-shaped polyvinyl alcohol fiber reinforced cement-based composite material of this embodiment includes the following raw materials: cement, quartz sand, water reducing agent, special-shaped polyvinyl alcohol fiber and water, wherein the water-sand ratio is 1:2; the water-cement ratio is 0.45:1; Polyalkylene glycol monomethacrylate water reducing agent is used, and the blending amount is 0.3wt% of water; the volume blending amount of special-shaped polyvinyl alcohol fiber is 1% of the total volume of the composite material.

[0051] Among them, in the preparation of the special-shaped polyvinyl alcohol fiber, the special-shaped spinneret micropores of the spinneret adopt a flat wave shape, and the degree of irregularity is 90%. It includes the following steps:

[0052] (I) The chemically modified polyvinyl alcohol powder is melt-spun on extrusion-spinning equipment, and after melt-extrusion, filtration and metering, it is ejected from the micro-holes of the special...

Embodiment 3

[0060] The special-shaped polyvinyl alcohol fiber reinforced cement-based composite material of this embodiment includes the following raw materials: cement, quartz sand, water reducing agent, special-shaped polyvinyl alcohol fiber and water, wherein the water-sand ratio is 1:2.2; the water-cement ratio is 0.5:1; use maleic anhydride and styrene copolymer water reducing agent, the mixing amount is 0.6wt% of water; the volume mixing amount of special-shaped polyvinyl alcohol fiber is 2% of the total volume of the composite material.

[0061] Among them, in the preparation method of the melt-spun special-shaped polyvinyl alcohol fiber, the special-shaped spinneret micropores of the spinneret adopt a trilobe type, and the degree of irregularity is 75%. It includes the following steps:

[0062] (I) The physically modified polyvinyl alcohol powder is melt-spun on extrusion-spinning equipment, and after melt-extrusion, filtration and metering, it is ejected from the micro-holes of the sp...

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Abstract

The invention discloses a special-shaped polyvinyl alcohol fiber reinforced cement-based composite material and a preparation method thereof, and belongs to the technical field of cement paste materials. The composite material comprises the following raw materials: cement, quartz sand, a water reducing agent, special-shaped polyvinyl alcohol fibers and water, wherein the water-sand ratio is 1: (1.8-2.4), the water-cement ratio is (0.4-0.55): 1, the mixing amount of the water reducing agent is 0.1-0.8 wt% of that of the water, and the volume mixing amount of the special-shaped polyvinyl alcoholfibers is 0.5-3% of the total volume of the composite material. The special-shaped polyvinyl alcohol fibers are high in strength, large in special shape degree and good in special shape retention degree, and the durability and the mechanical property of the cement-based material can be effectively improved.

Description

Technical field [0001] The invention relates to the technical field of cement slurry materials, in particular to a special-shaped polyvinyl alcohol fiber reinforced cement-based composite material and a preparation method thereof. Background technique [0002] Since the advent of Portland Cement in 1824, cement and cement-based materials have become the world's largest man-made materials. In 2019, my country's cumulative cement output was 2.31 billion tons. However, cement is a brittle material, with poor crack resistance, high brittleness, and low tensile strength. In particular, the appearance of fine cracks in cement-based materials under external force will reduce the penetration resistance of buildings and accelerate the carbonization of cement-based materials and steel reinforcement. Corrosion, and the cracks gradually expand and lead to failure, which seriously affects the safety and durability of cement-based material structures. [0003] Fiber reinforcement is an importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B16/06D01F6/14D01D5/253D01D10/02
CPCC04B16/0641C04B28/00C04B2201/50D01D5/253D01D10/02D01F6/14C04B14/06C04B2103/302
Inventor 王琪陈宁王萌李莉
Owner SICHUAN UNIV
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