Ultrahigh-performance cement-based composite material

A technology of ultra-high performance and composite materials, applied in the field of concrete, can solve the problems of weakening the compressive strength of concrete, failing to achieve ultra-high strength, and improving

Inactive Publication Date: 2015-12-30
浙江宏日泰耐克新材料科技有限公司
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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 re

Method used

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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 =A+(100-A)·(d / D max ) π / 2e ;

[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...

Embodiment 2

[0113] 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%, and the cement is P·O cement with a strength grade of 52.5. 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-cement ratio W / B=0.132, the admixture uses polycarboxylate water reducer 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.

[0114] The volume percentage of the main materials used in ultra-high performance cement-based composites is as follows:

[0115]

[0116] The dosage ...

Embodiment 3

[0124] Ultra-high performance cement-based composite material, including cementitious material, water and water reducer, the volume of cement accounts for 49%, the cement is P·I cement with a strength grade of 62.5, and the mineral admixture is silica fume, powder Coal ash and slag powder account for 18% by volume; the proportions of each component of the cementitious material are calculated in Example 1 to obtain 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, and the admixture is polycarboxylate water-reducer solution, and the dosage is 2.1% of the mass of the gelling material.

[0125] The volume percentage of the main materials used in ultra-high performance cement-based composites is as follows:

[0126]

[0127]

[0128] The dosage and quality ratio of each material of ultra-high performance cement-based composite materials are as follows:

[0129]

[0130] Ultra-high-performance cement-based composite materials ref...

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Abstract

The invention relates to an ultrahigh-performance cement-based composite material. Particle gradation of a polynary gelling material and particle gradation of aggregates are optimized, and a water reducer and other additives are used, so the compressive strength under 28d standard curing reaches 170MPa or above on the premise that concrete has good fluidity. The material has the following technical advantages: construction fluidity requirements are met under a low water-binder ratio; under standard curing conditions, the strength of the concrete in 7d age reaches 120MPa or above, and the strength of the concrete in 28d age reaches 170MPa or above; compared with RPC which only can be used to produce prefabricated parts, the composite material can be stirred and constructed in any occasions without hot curing or pressure forming; the impermeability, the carbonization resistance, the chloride ion penetration resistance and the freeze thaw cycle resistance of the composite material are better than those of common concrete; and the composite material can be used to produce member products with the cross section being 50% (or more) than the common concrete member products.

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] In the 1990s, RichardP and others in France developed a new type of cement composite material: reactive powder concrete (Reactive powder concrete, referred to as RPC). 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, there...

Claims

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Application Information

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IPC IPC(8): C04B28/08
Inventor 王俊颜刘国平施慧聪赵正刘健姚欣
Owner 浙江宏日泰耐克新材料科技有限公司
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