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High-toughness cement based composite material

A composite material and cement-based technology, applied in the field of building materials, can solve the problems of small size, low tensile strength, low shear strength, and easy cracking, and achieve simple manufacturing process, good earthquake resistance and deformation resistance, and good deformation resistance Effect

Inactive Publication Date: 2017-11-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tensile and shear strength of concrete materials are low, the ultimate tensile strain is small, and it is easy to crack and brittle failure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: The high-toughness cement-based composite material of this embodiment is used to cover the plane seam with a height of 30 cm and a width of 3 cm in the steel structure.

[0013] The components of this example are cement, fly ash, sand, water, water reducing agent and PVA fiber, in terms of mass ratio, cement: fly ash: sand: water: water reducing agent=1:1.0:0.6:0.42 : 0.001; based on the total volume of cement, fly ash, sand and water reducer mixed uniformly, the dosage of PVA fiber is 13kg / m 3 . The cement used is P.O.42.5 Portland cement; the fly ash is the first grade fly ash; the particle size of the sand is 0.2mm~0.4mm; the PVA fiber is the fiber produced in Japan, the length is 12mm, the diameter is 39μm, the tensile strength It is 1620MPa, the elastic modulus is 42.8GPa, the elongation at break is 7%, and Sika polycarboxylate superplasticizer is added.

[0014] The preparation method of this implementation case is: dry mix cement, fly ash, and san...

Embodiment 2

[0016] Embodiment 2: The components of this embodiment are cement, fly ash, sand, water, water reducer and PVA fiber, wherein, by mass ratio, cement: fly ash: sand: water: water reducer=1 : 1.2: 0.72: 0.57: 0.003; based on the total volume of cement, fly ash, sand, and water reducing agent mixed uniformly, the dosage of PVA fiber is 20kg / m 3 . The cement used is P.O.42.5 Portland cement; the fly ash is the first grade fly ash; the particle size of the sand is 0.2mm~0.4mm; the PVA fiber is the fiber produced in Japan, the length is 12mm, the diameter is 39μm, the tensile strength It is 1620MPa, the elastic modulus is 42.8GPa, the elongation at break is 7%, and Sika polycarboxylate superplasticizer is added.

[0017] The preparation method of this implementation case is: dry mix cement, fly ash, and sand for 2 minutes, then add PVA fiber and mix for 12 minutes until uniform; then add water and water reducer and wet mix for 15 minutes until uniform to obtain a high-toughness cem...

Embodiment 3

[0022] Embodiment 3: In this embodiment, a retaining wall is repaired by spraying ECC. The components of this embodiment are cement, fly ash, sand, water, water reducing agent and PVA fiber. Among them, in terms of mass ratio, cement: fly ash: sand: water: water reducing agent = 1: 1.0: 0.8: 0.57: 0.003; the total volume after mixing cement, fly ash, sand and water reducing agent is Base, the dosage of PVA fiber is 18kg / m 3 . The cement used is P.O.42.5 Portland cement; the fly ash is first-class fly ash; the particle size of the sand is 0.2mm~0.4mm; the PVA fiber is a fiber produced in Japan, the length is 12mm, the diameter is 39μm, and the tensile strength It is 1620MPa, the modulus of elasticity is 42.8GPa, the elongation at break is 7%, and Sika polycarboxylate superplasticizer is added.

[0023] The preparation method of this implementation case is: dry mix cement, fly ash, and sand for 2 minutes, then add PVA fiber and mix for 12 minutes until uniform; then add water...

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Abstract

The invention discloses a high-toughness cement based composite material. The high-toughness cement based composite material is prepared from the following components: cement, coal ash, sand, water, a water reducer and PVA fibers, wherein a mass ratio of the cement to the coal ash to the sand to the water to the water reducer is 1 to (1.0 to 1.2) to (0.6 to 0.8) to (0.42 to 0.57) to (0.001 to 0.003); based on the total volume of a mixture obtained by uniformly mixing the cement, coal ash, sand and water reducer, mixing amount of the PVA fibers is 13-20kg / m<3>. The high-toughness cement based composite material has the characteristics of strain-hardening and multi-seam cracking under stretching, bending and shearing load, and a component prepared by the materials shows a high-ductility characteristic. The high-toughness cement based composite material has a good adhesive property with brick masonry and a steel structure, and is an ecological type building material with high toughness, high durability, high energy consumption, high shock resistance and high deformation resistance.

Description

technical field [0001] The invention relates to a building material, in particular to concrete mixed with polyvinyl alcohol (Polyvinyl alcohol, PVA for short) fibers. Background technique [0002] Concrete is an artificial stone formed by mixing cement and other cementitious materials, sand and gravel aggregates, water and admixtures in a certain proportion, and then hardened and cured. With the use of supporting formwork and steel bars, concrete materials have the advantages of good plasticity, abundant raw materials, low price, high strength and good durability, and are widely used in various projects. However, concrete materials have low tensile and shear strengths, small ultimate tensile strain, and are prone to cracking and brittle failure. Contents of the invention [0003] The purpose of the present invention is to provide a high-toughness cement-based composite material with high toughness, high durability, high energy consumption, good shock resistance and deform...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/34
CPCC04B28/04C04B2201/50C04B2111/343C04B18/08C04B14/06C04B2103/302C04B16/0641
Inventor 李晓琴丁祖德杜茜陶毅
Owner KUNMING UNIV OF SCI & TECH
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