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PVA fiber reinforced cement-based composite material

A fiber-reinforced cement and composite material technology, applied in the field of PVA fiber-reinforced cement-based composite materials, can solve problems such as not being effectively utilized, and achieve the effects of being beneficial to long-term durability, improving compactness, and reducing costs

Inactive Publication Date: 2016-08-31
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the annual output of fly ash as an industrial waste exceeds 600 million tons worldwide, but more than 80% of it is discarded in landfill areas and has not been effectively utilized. The rational use of 1 ton of fly ash can replace 0.6-0.8 tons of cement. Save 0.12-0.20t standard coal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A kind of PVA fiber reinforced cement base composite material, is made up of the component of following parts by weight:

[0058] Cement: 11.8 parts;

[0059] Fly ash: 47.2 parts;

[0060] River sand: 21.25 parts;

[0061] Water reducer: 0.54 parts;

[0062] Defoamer: 0.03 parts;

[0063] Thickener: 0.03 parts;

[0064] Fiber: 1.25 parts;

[0065] Water: 17.9 parts.

[0066] The test results of the performances of the test components obtained in this embodiment are shown in Table 1. The test components adopt standard maintenance, and the maintenance age and the test age are 28d, where f cu is the standard value of cubic compressive strength; f f is the flexural strength; fts is the splitting tensile strength; ε tu is the strain rate.

[0067] Table 1: Table of test results of various properties of the test components obtained in Example 1.

[0068] f cu / MPa

Embodiment 2

[0070] A kind of PVA fiber reinforced cement base composite material, is made up of the component of following parts by weight:

[0071] Cement: 19.17 parts;

[0072] Fly ash: 39.7 parts;

[0073] River sand: 21.5 parts;

[0074] Water reducer: 0.53 parts;

[0075] Defoamer: 0.03 parts;

[0076] Thickener: 0.03 parts;

[0077] Fiber: 1.24 parts;

[0078] Water: 17.8 parts.

[0079] The test results of various properties of the test components obtained in this embodiment are shown in Table 2. The test components adopt standard maintenance, and the maintenance age and the test age are 28 days.

[0080] Table 2: The test result table of various properties of the test components obtained in Example 2.

[0081] f cu / MPa

Embodiment 3

[0083] A kind of PVA fiber reinforced cement base composite material, is made up of the component of following parts by weight:

[0084] Cement: 19.6 parts;

[0085] Fly ash: 39.9 parts;

[0086] River sand: 20.8 parts;

[0087] Water reducer: 0.54 parts;

[0088] Defoamer: 0.03 parts;

[0089] Thickener: 0.03 parts;

[0090] Fiber: 1.25 parts;

[0091] Water: 17.85 parts.

[0092] The test results of various properties of the test components obtained in this embodiment are shown in Table 3. The test components adopt standard maintenance, and the maintenance age and the test age are 28 days.

[0093] Table 3: Table of test results of various properties of the test components obtained in Example 3.

[0094] f cu / MPa

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Abstract

The invention discloses a PVA fiber reinforced cement-based composite material, which is composed of the following ingredients (by weight): 11.8-26.8 parts of cement, 32.2-47.2 parts of flyash, 20.8-21.5 parts of river sand, 0.53-0.54 part of a water reducing agent, 0.03 part of an antifoaming agent, 0.03 part of a thickening agent, 1.24-1.25 parts of fiber and 17.7-17.9 parts of water. By replacing cement in the PVA fiber reinforced cement-based composite material with high volume of flyash, wastes are changed into valuable things, cost is reduced, CO2 emission is minimized, and lots of natural resources and energy are saved. In addition, crack width and natural air shrinkage of the PVA fiber reinforced cement-based composite material are reduced, long-term durability of the structure is enhanced, stress concentration degree of crack tip is weakened, fiber crack-retarding mechanism is fully performed, and flexural toughness of the fiber reinforced cement-based composite material is enhanced.

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] Polyvinyl alcohol (PVA) fiber reinforced cementitious composites, also known as engineering cementitious composites, abbreviated as ECC (Engineered Cementitious Composites), was proposed by Professor Victor C.Li of the University of Michigan in 1992. ECC is usually made of cement or cement plus filler, plus fine aggregate of small particle size as the matrix, and fiber as the reinforcing material. ECC composite materials have ultra-high toughness, high tensile strength, and high crack resistance. It can realize steady-state cracking and form multi-crack failure mode. It has strain hardening characteristics. Its ultimate tensile strain rate can reach 3%-5%, which is 300-500 times that of ordinary concrete. It is resistant to impact, tension and shear. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/06C04B16/06C04B18/08C04B24/38
CPCC04B28/04C04B18/08C04B14/068C04B24/383C04B16/0641C04B2103/302C04B2103/50Y02A30/30Y02W30/91
Inventor 何淅淅丁鲁波张博
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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