Iron tailing sand PVA fiber-reinforced-cement-based composite

A fiber-reinforced cement and composite material technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of natural landscape deterioration, resource depletion, water and soil erosion, etc., and achieve excellent tensile strain hardening performance , Excellent energy consumption and reduced processing costs

Inactive Publication Date: 2016-07-20
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the polyvinyl alcohol fiber reinforced cement-based composite materials developed and researched at home and abroad are mainly prepared by natural river sand. Due to the non-renewability of natural river sand, excessive mining and use will lead to resource depletion, soil erosion, deterioration of natural landscape and Natural disasters such as river bed diversions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An iron tailing sand PVA fiber reinforced cement-based composite material, which is composed of the following components in mass percentage: cement: 26.1%; fly ash: 31.3%; iron tailing sand: 20.9%; water: 20%; fiber: 1.24% ; Superplasticizer: 0.4%; Defoamer: 0.03%; Thickener: 0.03%.

[0027] The test results of various properties of the product obtained in this example are shown in Table 1; the components adopt standard maintenance, and the maintenance age and test age are 28 days.

[0028] Table 1: The test result table of each performance of the test component obtained in embodiment 1

[0029] f cu / MPa

f f / MPa

f ts / MPa

ε tu

48.1

10.8

4.9

2.37％

[0030] Among them, the meanings of the parameters in the table are as follows:

[0031] f cu is the standard value of cubic compressive strength;

[0032] f f is the flexural strength;

[0033] f ts is the splitting tensile strength;

[0034] ε tu is the strain...

Embodiment 2

[0036] An iron tailing sand PVA fiber reinforced cement-based composite material, which is composed of the following components in mass percentage: cement: 27.6%; fly ash: 32.9%; iron tailing sand: 21.9%; water: 15.65%; fiber: 1.25% ; Superplasticizer: 0.64%; Defoamer: 0.03%; Thickener: 0.03%.

[0037] The test results of various properties of the product obtained in this example are shown in Table 2; the components adopt standard maintenance, and the maintenance age and test age are 28 days.

[0038] Table 2: The test result table of various performances of the test components obtained in Example 2

[0039] f cu / MPa

Embodiment 3

[0041] An iron tailing sand PVA fiber reinforced cement-based composite material, which is composed of the following components in mass percentage: cement: 26.8%; fly ash: 32.2%; iron tailing sand: 21.5%; water: 17.7%; fiber: 1.24% ; Superplasticizer: 0.50%; Defoamer: 0.03%; Thickener: 0.03%.

[0042] The test results of various properties of the product obtained in this example are shown in Table 3; the components adopt standard maintenance, and the maintenance age and test age are 28 days.

[0043] Table 3: The test result table of each performance of the test component obtained in embodiment 3

[0044] f cu / MPa

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Abstract

The invention discloses an iron tailing sand PVA fiber-reinforced-cement-based composite.The composite is composed of, by mass, 26.1-27.6% of cement, 31.3-33.2% of coal ash, 20.9-22.1% of iron tailing sand, 15.2-20% of water, 1.24-1.25% of fibers, 0.34-0.66% of an efficient water reducing agent, 0.03% of an antifoaming agent and 0.03% of a thickening agent.According to the composite, fine aggregate is used as the iron tailing sand and replaces all natural sand, massive recycling of iron tailings can be achieved, the problems of environmental pollution and ecological hazards caused by the iron tailings are reduced, land resources and natural sand resources are saved, circular economy development of a city and saving type city construction are promoted, and certain social benefits and economic benefits are created; processing cost of the composite is greatly lowered; in addition, the composite can meet the strength requirement in engineering and has excellent tensile strain hardening performance, deformation performance, energy-dissipating capacity and excellent endurance performance.

Description

technical field [0001] The invention relates to the technical field of fiber-reinforced cement-based composite materials, in particular to an iron tailing sand PVA fiber-reinforced cement-based composite material. Background technique [0002] Polyvinyl alcohol (PVA) fiber-reinforced cementitious composites can be called engineering cementitious composites, abbreviated as ECC (Engineered Cementitious Composites), which was proposed by Professor VictorC.Li of the University of Michigan in 1992. ECC is usually cement or cement plus filler, plus fine aggregate with small particle size as the matrix, and fiber as the reinforcing material. The composite material has ultra-high toughness, high tensile strength, and high crack resistance. Steady-state cracking, forming multi-crack failure form, with strain hardening characteristics, its ultimate tensile strain rate can reach 3% to 5%, which is 300 to 500 times that of ordinary concrete, and it has impact resistance, tensile strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/12
CPCC04B18/12C04B28/04C04B2201/50C04B18/08C04B16/0641C04B24/24C04B2103/50C04B24/383Y02W30/91
Inventor 何淅淅丁鲁波刘翔
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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