Graded sand high-strength reactive powder concrete and preparation method thereof

A technology of active powder and graded sand, applied in the fields of civil engineering materials and concrete, can solve the problems of high cost of RPC, reduced fluidity of RPC, and little improvement of compressive strength, and achieve uniform material properties, convenient material selection, and less variety. Effect

Active Publication Date: 2017-10-13
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, steel fiber is the main reason for the high cost of RPC; on the other hand, if the amount of steel fiber is too much, ...

Method used

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  • Graded sand high-strength reactive powder concrete and preparation method thereof
  • Graded sand high-strength reactive powder concrete and preparation method thereof

Examples

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Embodiment 1

[0045] A high-strength active powder concrete with graded sand cured at room temperature, each component is weighed according to the following parts by weight:

[0046] Cement: 1 part; Quartz sand: coarse sand 0.2 part, medium sand 0.8 part, fine sand 0.2 part; silica fume: 0.3 part; water reducing agent: 0.02 part; water: 0.23 part; steel fiber volume is the volume of all the above materials 0.075%.

[0047] Among them, the cement uses a certain 42.5 ordinary Portland cement; the quartz sand adopts three particle sizes, the particle size range is 0-1.25mm, of which the fine sand is 0.16-0.315mm, and the medium sand is 0.30-0.60mm. Coarse sand is 0.60 ~ 1.25mm; silica fume composition is silicon dioxide (SiO 2 ), the average particle size is 0.31μm; the water reducing agent is a white powder high-performance polycarboxylate water reducing agent, the water reducing rate is 30.5%, and the density is 1.09±0.02g / m; the steel fiber is made of copper-plated smooth flat steel The f...

Embodiment 2

[0051] A kind of high-temperature curing graded sand high-strength reactive powder concrete, each component is weighed according to the following mass parts:

[0052] Cement: 1 part; Quartz sand: 0.2 part of coarse sand, 0.8 part of medium sand, 0.2 part of fine sand; silica fume: 0.3 part; water reducing agent: 0.02 part; water: 0.23 part; steel fiber volume is the volume of all the above materials 0.02%.

[0053] Among them, the cement uses a certain 42.5 ordinary Portland cement; the quartz sand adopts three particle sizes, the particle size range is 0-1.25mm, of which the fine sand is 0.16-0.315mm, the medium sand is 0.30-0.60mm, and the coarse sand is 0.60~1.25mm; the silica fume component is silicon dioxide (SiO 2 ), the average particle size is about 0.31μm; the water reducing agent is a white powder high-performance polycarboxylate water reducing agent, the water reducing rate is 30.5%, the density: 1.09±0.02g / m; the amount of steel fiber is the volume fraction, using...

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Abstract

The invention discloses graded sand high-strength reactive powder concrete and a preparation method thereof. The reactive powder concrete is prepared from the following raw material components in parts by weight: 1 part of cement, 0.2 part of crude quartz sand, 0.8 part of medium sand, 0.2 part of fine sand, 0.3 part of silica fume, 0.02 part of a water reducing agent, 0.23 part of water, 0.0075 part of normal-temperature steel fibers and 0.02 part of high-temperature steel fibers, wherein the particle size of the fine sand is 0.16 to 0.315 mm, the particle size of the medium sand is 0.30 to 0.60 mm, the particle size of the crude sand is 0.60 to 1.25 mm, and the volume of the steel fibers is 0.075 percent or 2 percent of that of all the materials. According to the preparation method disclosed by the invention, quart sand with three particle sizes is selected to increase the aggregate packing degree; specific optimized gradation is provided, and a proper amount of steel fibers are doped to improve the tensile strength of a matrix; the proper amount of a cementing material is optimized, so that the workability of the reactive powder concrete is improved; the prepared reactive powder concrete has excellent performance; and the preparation method is simple.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a graded sand high-strength reactive powder concrete and a preparation method thereof, belonging to the technical field of civil engineering materials. Background technique [0002] (Reactive Powder Concrete) is a kind of ultra-high performance concrete, which has the characteristics of ultra-high strength, high toughness, high durability, and good volume stability. Its research began in 1993 in the French Bouygues laboratory. [0003] The preparation principle of active powder concrete is based on the solid suspension model of the maximum compactness theory, so as to optimize the internal pore structure, reduce porosity and increase compactness. In order to make the particles of different materials better wrap and embed each other, and enrich the entire concrete structure, it is necessary to remove the coarse aggregate and improve the aggregate density by optimizing the gradati...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B40/00
CPCC04B28/04C04B40/0028C04B2201/50C04B2201/52C04B14/06C04B20/0076C04B18/146C04B2103/302C04B14/48C04B40/0263C04B40/02
Inventor 金凌志陈璇李豫华王龙梁曦
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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