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High-toughness hybrid fiber reinforced concrete and a preparing method thereof

A technology of reinforced concrete and mixed fibers, which is applied in the field of building materials, can solve the problems such as the incorporation of nanoparticles and the reduction of concrete toughness, and achieve the effects of microstructure improvement, compactness, bending toughness and fracture toughness

Inactive Publication Date: 2016-12-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the concrete prepared in the above literature cannot solve the problem that the incorporation of nanoparticles reduces the toughness of concrete, and can only be used in concrete projects with low toughness requirements.

Method used

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  • High-toughness hybrid fiber reinforced concrete and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The concrete (in 1 m 3 The method of preparation) is as follows:

[0062] (1) Weigh the following raw materials by weight:

[0063] Cement 390 kg (ordinary Portland cement with a strength grade of P.O 42.5, the same below),

[0064] Coarse aggregate 1140 kg (granite crushed stones with a particle size not greater than 20 mm, and the granite crushed stones are hard and well-graded, the same below),

[0065] Fine aggregate 650 kg (natural river sand with a fineness modulus of 2.76, the same below),

[0066] Fly ash 75 kg ( Grade fly ash with a fineness of 9.2%; manufacturer: Pingdingshan Yaomeng Power Plant, the same below),

[0067] Nano silica 25 kg (particle size less than 30 nm; manufacturer: Hangzhou Wanjing New Material Co., Ltd., the same below),

[0068] Polycarboxylate superplasticizer 5 kg (water reducing rate greater than 22%, manufacturer: Shanxi Huanghe New Chemical Co., Ltd., the same below),

[0069] water 165 kg,

[0070] Polyvinyl alcohol fiber 0....

Embodiment 2

[0088] The concrete (in 1 m 3 The preparation raw materials and weight are as follows:

[0089] 400 kg of cement, 1140 kg of coarse aggregate, 650 kg of fine aggregate, 75 kg of fly ash, 15 kg of nano-silica, 5 kg of polycarboxylate superplasticizer, 165 kg of water, 0.6 kg of polyvinyl alcohol fiber, Steel fiber 75 kg;

[0090] The preparation method is the same as in Example 1.

[0091] Gained concrete is tested, and test method is with embodiment 1, and result is as follows:

[0092] tested,

[0093] The obtained concrete flexural toughness index I 5 , I 10 , I 20 and I 30It can reach 5.4, 10.6, 18.9 and 25.4 respectively, which are 42%, 43%, 54% and 52% higher than ordinary concrete;

[0094] Crack initiation fracture toughness and instability fracture toughness can respectively reach 1040kN / m 3 / 2 and 2788kN / m 3 / 2 , respectively 37% and 31% higher than ordinary concrete;

[0095] The fracture energy can reach 2396N / m, which is 8.5 times higher than that of ordin...

Embodiment 3

[0097] The concrete (in 1 m 3 The preparation raw materials and weight are as follows:

[0098] 380 kg of cement, 1140 kg of coarse aggregate, 650 kg of fine aggregate, 75 kg of fly ash, 35 kg of nano-silica, 5 kg of polycarboxylate superplasticizer, 165 kg of water, 0.7 kg of polyvinyl alcohol fiber, Steel fiber 120 kg;

[0099] The preparation method is the same as in Example 1.

[0100] Gained concrete is tested, and test method is with embodiment 1, and result is as follows:

[0101] tested,

[0102] The obtained concrete flexural toughness index I 5 , I 10 , I 20 and I 30 It can reach 5.8, 11.3, 21.4 and 31.6 respectively, 53%, 53%, 74% and 89% higher than ordinary concrete;

[0103] Crack initiation fracture toughness and instability fracture toughness can respectively reach 1322kN / m 3 / 2 and 3724kN / m 3 / 2 , respectively 74% and 75% higher than ordinary concrete;

[0104] The fracture energy can reach 3185N / m, which is 11.6 times higher than that of ordinary con...

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Abstract

The objective of the invention is to provide high-toughness hybrid fiber reinforced concrete and a preparing method thereof. Nanometer silica and hybrid fiber are added into the concrete. Flexural toughness and fracture toughness are significantly improved. The hybrid fiber reinforced concrete can be used for long-span and high-layer building structure projects having high toughness requirements.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-toughness hybrid fiber-reinforced concrete and a preparation method thereof. Background technique [0002] The concept of "nano" was formed in the early 1980s. Nanomaterials refer to particles with a particle size ranging from 1nm to 100nm. In recent years, with the deepening of research on nanomaterials and the reduction of manufacturing costs, their application fields have become more and more extensive. Many researchers at home and abroad have conducted exploratory research on the application of nanoparticles in cement concrete. Although the incorporation of nanoparticles into concrete improves the compactness and durability of concrete and improves the mechanical properties of concrete, the incorporation of nanoparticles also increases the brittleness of concrete and reduces the toughness of concrete. If concrete is used for In structures an...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B16/06C04B111/34
CPCC04B14/48C04B16/0641C04B28/04C04B2111/343C04B14/048C04B14/068C04B18/08C04B14/06C04B2103/302C04B22/002
Inventor 张鹏李清富常海召张天航高继祥
Owner ZHENGZHOU UNIV
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