Low-viscosity and easy-pumping ultrahigh performance concrete and preparation method thereof

An ultra-high-performance concrete technology, applied in the field of building materials, can solve problems such as high viscosity, poor pumping performance, and difficult large-scale construction, and achieve the effects of high fluidity, reduced cement consumption, and reduced pumping resistance

Active Publication Date: 2019-08-16
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the conventional ultra-high performance concrete has high viscosity, poor pumpability, and difficulty in large-

Method used

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  • Low-viscosity and easy-pumping ultrahigh performance concrete and preparation method thereof
  • Low-viscosity and easy-pumping ultrahigh performance concrete and preparation method thereof
  • Low-viscosity and easy-pumping ultrahigh performance concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0103] In Example 1, the admixture components are microsilica powder, microbeads and fillers mixed in a mass ratio of 80:70:300; the filler components and the mass ratio of each component are fly ash: finely ground ore powder: quartz powder= 80:120:100; thixotropic enhancer is inorganic thixotropic enhancer, organic thixotropic enhancer is mixed in a ratio of 10:5 by mass, organic thixotropic enhancer is propylene glycol alginate; water reducing agent is PCE1; fiber is Straight steel fibers and end hook fibers are mixed in a mass ratio of 2:1.

Example Embodiment

[0104] In Example 2, the admixture components are microsilica powder, microbeads and fillers mixed in a mass ratio of 80:70:300; the filler components and the mass ratio of each component are fly ash: finely ground ore powder: quartz powder= 80:120:100; thixotropic enhancer is inorganic thixotropic enhancer, organic thixotropic enhancer is mixed in a ratio of 10:5 by mass, organic thixotropic enhancer is starch ether; water reducing agent is PCE2; fiber is straight Steel fibers and end hook fibers are mixed in a mass ratio of 2:1.

Example Embodiment

[0105] In Example 3, the admixture components are microsilica powder, microbeads and fillers mixed in a mass ratio of 100:100:250; the filler components and the mass ratio of each component are fly ash: finely ground ore powder: quartz powder = 70:80:100; thixotropic enhancer is inorganic thixotropic enhancer; water reducing agent is PCE3; fiber is end hook type steel fiber.

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Abstract

The invention discloses a low-viscosity and easy-pumping ultrahigh performance concrete and a preparation method thereof. The concrete comprises, by mass, 300-500 parts of cement, 100-200 parts of silica fume, 300-600 parts of an admixture, 400-800 parts of sands, 300-700 parts of crushed stones, 80-240 parts of fibers, 5-30 parts of a thixotropic enhancer, 15-30 parts of a water reducer, 0.1-0.3part of an antifoaming agent and 140-180 parts of water. The low-viscosity and easy-pumping ultrahigh performance concrete of the invention has a high fluidity and a low viscosity, the pumping resistance is only 0.015-0.025 MPa/m, and the compressive strength after 28 d standard curing is 180 MPa or above. In addition, the low-viscosity and easy-pumping ultrahigh performance concrete of the present invention has a typical low cement content, so the shrinkage of the ultrahigh performance concrete is significantly reduced, the use amount of the cement is significantly reduced, and the environmental pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to an ultra-high performance concrete, in particular to a low-viscosity and easy-to-pump ultra-high performance concrete and a preparation method thereof. Background technique [0002] Ultra-high performance concrete (UHPC) has excellent properties such as ultra-high strength, high toughness, high impermeability, high corrosion resistance and high explosion resistance, which can well meet the needs of lightweight, high-rise, large-scale civil engineering structures. The requirements of spanning and high durability have important strategic significance and broad application prospects in major or special projects such as long-span bridges, thin-walled structures, national defense projects, and deep-water offshore platforms. Reactive Powder Concrete (RPC) is the main representative of ultra-high-performance concrete, which mainly improves the compactness through a large amount ...

Claims

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Application Information

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IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/52C04B18/146C04B18/141C04B18/08C04B14/06C04B14/24C04B14/02C04B14/48C04B2103/0085C04B2103/302C04B2103/50
Inventor 张倩倩舒鑫杨勇王秀梅张建纲李申桐赵红霞
Owner JIANGSU SOBUTE NEW MATERIALS
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