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Lightweight high-strength cement based composite material

A composite material, cement-based technology, applied in the field of concrete, can solve the problems of poor workability and high cost

Inactive Publication Date: 2014-07-02
SHANGHAI LUOYANG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's research on lightweight high-strength cement-based composite materials started late, and its promotion was limited due to the constraints of the strength of lightweight aggregates, poor workability of materials under low water consumption, and high cost.

Method used

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  • Lightweight high-strength cement based composite material
  • Lightweight high-strength cement based composite material
  • Lightweight high-strength cement based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Lightweight high-strength cement-based composite material, including cementitious material, lightweight aggregate, water, fiber and water reducer, the cement is P·O cement with a strength grade of 42.5, and the mineral admixture is silica fume and powder Coal ash, the light aggregate used has a particle size of 0.5-2mm and an apparent density of 95kg / m 3 vitrified microbeads.

[0067] 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;

[0068] 1) The ideal stacking curve formula is:

[0069] P sd 100 · / m / ;

[0070] 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;

[0071] The value of the empirical constant A is determined by the formula according to the design slump or design expansion r...

Embodiment 2

[0096] Lightweight high-strength cement-based composite material, including cementitious material, aggregate, water, water reducer and thickener, the cement is P·II cement with a strength grade of 52.5, and the mineral admixture is silica fume and Mineral powder, the proportion of each component of cementitious material is by the calculation method of embodiment 1, gets X c =0.503,X sf =0.244,X bs =0.254;

[0097] The aggregates used include:

[0098] 1# aggregate: natural river sand with a fineness modulus of 2.7;

[0099] 2# aggregate: the particle size is 0.5~2mm and the apparent density is 95kg / m 3 vitrified microbeads;

[0100]3# aggregate: the particle size is 5-10mm and the apparent density is 500kg / m 3 Light shale ceramsite;

[0101] The ratio of aggregates is numerically analyzed and calculated through ideal stacking curves and cumulative distribution curves of various aggregates;

[0102] 1) The accumulation curve formula is:

[0103] P dA B 100 B d A / D ...

Embodiment 3

[0126] Lightweight high-strength cement-based composite material, including cementitious material, aggregate, water, water reducing agent and shrinkage reducing agent, the cement is P·II cement with a strength grade of 62.5, and the mineral admixture is silica fume and ore Powder, the proportion of each component of the cementitious material is by the calculation method of embodiment 1, gets X c =0.774, X sf =0.122,X bs =0.104; the aggregate is natural river sand with a fineness modulus of 2.7 and a particle size of 5-10mm with an apparent density of 550kg / m 3 Lightweight fly ash ceramsite, the proportioning fraction of each component of aggregate is according to the calculation method of embodiment 2, gets X s1 =0.192,X s2 =0.808; the volume ratio of aggregate to cementitious material is 0.943; the water-binder ratio is 0.159; the admixture is polycarboxylate water reducer solution, and the dosage is 1.5% of the mass of cementitious material; the thickener is methyl cellul...

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Abstract

The invention relates to a lightweight high-strength cement based composite material. The grain composition of a multivariate cementing material and grain composition of aggregate are optimized, anddue to use of additives such as water reducing agent and thickener, the material can obtain high compressive strength of over 20MPa while obtaining the unit weight which is significantly lower than that of common concrete. The material has the technical advantages that the compressive strength of 28d standard curing is greater than or equal to 20MPa when the unit weight is smaller than or equal to 1650kg / m<3>; the requirements of the construction liquidity can be met by grain composition of the optimized gel material and the grain composition of the aggregate; the hardened material has a dense surface, and has excellent endurance performances such as anti-permeability, carbonation resistance, resistance to chloride ion erosion and the like.

Description

technical field [0001] The invention belongs to the technical field of concrete and relates to a lightweight high-strength cement-based composite material. Background technique [0002] Modern concrete has been used as a man-made building material for more than 170 years. In the process of production practice, with the improvement of the technical level, in order to solve the shortcomings of the high quality of ordinary concrete, people have gradually developed a new type of concrete-lightweight concrete. Since lightweight concrete is a new type of concrete with high specific strength, thermal insulation and fire resistance, and good seismic performance, it can be widely used in various industrial and civil buildings and other structures, and has good technical and economic value. Therefore, since the 1960s, It has been greatly developed and applied in countries all over the world, and has become one of the fastest-growing light-weight, high-strength new building materials ...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B18/08C04B18/12
CPCY02W30/91
Inventor 刘国平施慧聪赵正王俊颜姚欣刘健
Owner SHANGHAI LUOYANG NEW MATERIAL TECH
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