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Ultra-high performance cement base composite material

An ultra-high performance, composite material technology, applied in the field of concrete, can solve the problems of not reaching ultra-high strength, weakening the compressive strength of concrete, and improving

Inactive Publication Date: 2014-07-16
SHANGHAI LUOYANG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water reducing agent in the chemical additive can effectively disperse the cementitious material to prevent the flocculation of the cementitious material and improve the fluidity of the concrete, but excessive addition of the water reducing agent will greatly increase the air content in the concrete mixture, weakening the compressive strength of the concrete, That is, when the workability of concrete is obtained, the performance of ultra-high strength is not achieved

Method used

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  • Ultra-high performance cement base composite material
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  • Ultra-high performance cement base composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Ultra-high performance cement-based composite material, including cementitious material, water and water reducer, the volume of cement accounts for 20%, the cement is P·I cement with a strength grade of 52.5, and the mineral admixture is silica fume and powder Coal ash accounts for 52.2% by volume.

[0087] The ratio fraction of cement, silica fume and fly ash is numerically analyzed and calculated through the ideal accumulation curve and its particle size cumulative distribution curve;

[0088] 1) The ideal stacking curve formula is:

[0089] P sd 100 / max / ;

[0090] Among them, P sd is the percentage of particles passing through the sieve, A is an empirical constant, d is the diameter of the sieve, D max is the maximum particle size of the particle;

[0091] The value of the empirical constant A is determined by the formula according to the design slump or design expansion requirements of ultra-high performance cement-based composite materials:

[0092] Slu...

Embodiment 2

[0110] Ultra-high performance cement-based composite material, including cementitious material, water, water reducer, defoamer and early strength agent, the volume of cement accounts for 57%, the cement is P·O cement with a strength grade of 52.5, and the mineral The admixture is silica fume and fly ash, accounting for 12.5% ​​by volume. Each component distribution fraction of gelling material is by the calculation mode of embodiment 1, gets X c =0.820,X sf =0.101 and X fa =0.079. The water-to-binder ratio W / B=0.132, the admixture uses polycarboxylate superplasticizer solution, the dosage is 1.1% of the mass of the gelling material, and the silicone defoamer is used, and the dosage is 0.1% of the mass of the gelling material. Triethanolamine early strength agent, the dosage is 0.03% of the mass of the gelling material.

[0111] The volume percentage of the main materials used in ultra-high performance cement-based composites is as follows:

[0112]

[0113] The dosage ...

Embodiment 3

[0118] Ultra-high-performance cement-based composite materials, including cementitious materials, water and water reducing agent, the volume of cement accounts for 49%, the cement is P·I cement with a strength grade of 62.5, and the mineral admixtures are silica fume, powder Coal ash and slag powder account for 18% by volume; the proportions of each component of the cementitious material are by the calculation method of embodiment 1, get X c =0.731,X sf =0.104,X fa =0.094 and X bs =0.070. The water-binder ratio W / B=0.143, the admixture uses the polycarboxylate superplasticizer solution, and the dosage is 2.1% of the mass of the gelling material.

[0119] The volume percentage of the main materials used in ultra-high performance cement-based composites is as follows:

[0120]

[0121]

[0122] The dosage and quality ratio of each material of ultra-high performance cement-based composite materials are as follows:

[0123]

[0124] Ultra-high-performance cement-base...

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Abstract

The present invention relates to a light weight and high strength cement base composite material. According to the present invention, particle size distribution of a multi-component cementing material and particle size distribution of an aggregate are optimized, and a reducing agent, a thickener and other chemical admixtures are used to make the material can concurrently achieve bulk density of significantly lower than bulk density of the ordinary concrete and a compressive strength of more than 20 MPa; the technical advantages of the material comprise that: in the case of the bulk density of less than or equal to 1650 kg / m<3>, the 28 d standard maintenance compressive strength of more than or equal to 20 MPa is achieved, and the construction fluidity requirements can be met in the case of the low water-binder ratio by optimizing the particle size distribution of the cementing material and the particle size distribution of the aggregate; and the hardened material has characteristics of compact surface, excellent impermeability, excellent carbonization resistance, chloride ion erosion resistance, and other durable performances.

Description

technical field [0001] The invention belongs to the technical field of concrete and relates to ultra-high-performance cement-based composite materials. Background technique [0002] Richard P and others in France developed a new type of cement composite material in the 1990s: reactive powder concrete (Reactive powder concrete, RPC for short). Reactive powder concrete (RPC) is an ultra-high-performance cement-based composite material obtained by mixing quartz powder, cement, silica fume, high-efficiency water reducer and fibers, etc., and adopting appropriate molding and maintenance processes. Compared with traditional concrete, RPC has excellent mechanical properties, including extremely high compressive strength, excellent impact resistance, and fatigue resistance. After adding fibers, the tensile properties and toughness of the material are significantly improved. RPC can be used to prepare building components with thinner sections or innovative section shapes, thereby gr...

Claims

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Application Information

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IPC IPC(8): C04B28/04
Inventor 王俊颜刘国平施慧聪赵正刘健姚欣
Owner SHANGHAI LUOYANG NEW MATERIAL TECH
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