A kind of active powder concrete mixed with fly ash and its preparation method

A technology of active powder and fly ash, which is applied in the field of building materials, can solve problems such as fly ash environmental pollution, achieve the effects of improving compactness, increasing compactness, and reducing environmental pollution

Active Publication Date: 2020-01-21
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of active powder concrete mixed with fly ash and its preparation method, while reducing the production cost of active powder concrete, solve the problem of environmental pollution caused by fly ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An active powder concrete mixed with fly ash is composed of the following materials in parts by mass: 1 part of cement, 1.1 part of quartz sand, 0.28 part of silica fume, 0.07 part of fly ash, 0.1 part of steel fiber, 0.1 part of small component, 0.2 parts of water, 0.015 parts of water reducer;

[0030] The cement is Portland cement with a label of 52.5, and the fineness of the cement is 10 m 2 / kg, initial setting time ≥ 45min, final setting time ≤ 600min.

[0031] The particle size of the quartz sand is 0.4mm, SiO 2 The content is above 99.6%.

[0032] The silica fume has an average particle size of 0.1 μm and a specific surface area of ​​>20 m 2 / g, water demand ratio <120%, loss on ignition 1.45.

[0033] The steel fiber is copper-plated smooth flat steel fiber, with a diameter of 0.22mm, a length of 12-15mm, and a tensile strength above 2300MPa.

[0034] The fly ash is off-white powder, with an average particle size of 6.34 μm and a loss on ignition of 0.4. ...

Embodiment 2

[0044] An active powder concrete mixed with fly ash is composed of the following materials in parts by mass: 1 part of cement, 1.1 part of quartz sand, 0.21 part of silica fume, 0.14 part of fly ash, 0.1 part of steel fiber, 0.1 part of small components, 0.2 parts of water, 0.015 parts of water reducer;

[0045] The cement is Portland cement with a label of 52.5, and the fineness of the cement is 10 m 2 / kg, initial setting time ≥ 45min, final setting time ≤ 600min.

[0046] The particle size of the quartz sand is 0.6mm, SiO 2 The content is above 99.6%.

[0047] The silica fume has an average particle size of 0.2 μm and a specific surface area of ​​>20 m 2 / g, water demand ratio <120%, loss on ignition 1.45.

[0048] The steel fiber is copper-plated smooth flat steel fiber, with a diameter of 0.22mm, a length of 12-15mm, and a tensile strength above 2300MPa.

[0049] The fly ash is off-white powder, with an average particle size of 6.34 μm and a loss on ignition of 0.4. ...

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Abstract

The invention discloses active powder concrete doped with coal ash and a preparation method of the active powder concrete. The active powder concrete doped with the coal ash is prepared from the following materials in parts by weight: 1 part of cement, 1.1 parts of quartz sand, 0.21 to 0.28 part of silica fume, 0.07 to 0.14 part of coal ash, 0.1 part of steel fibers, 0.1 part of small components, 0.2 part of water and 0.015 part of water reducer; and the active powder concrete doped with the coal ash is prepared by virtue of stirring, vibrating molding, mold stripping and high-temperature maintenance. The active powder concrete has the characteristics that the industrial waste slag powder is doped as an active component, and the novel active powder concrete is prepared by virtue of high-temperature maintenance, has the advantages of high strength, good mixability, low cost, environmental friendliness, simple preparation method and the like, is suitable for being popularized and used in real engineering, and conforms to the environment-friendly sustainable development strategy concept of China.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an active powder concrete mixed with fly ash and a preparation method thereof. Background technique [0002] Reactive powder concrete is an ultra-high performance concrete with high strength, high toughness, high durability and low porosity. The configuration principle is to reduce the internal defects (micro-cracks and pores) of the material to a minimum by removing coarse aggregates, increasing the activity and fineness of the components, so as to obtain high mechanical properties and high durability. Its basic composition materials are: cement, fine quartz sand, ground quartz powder, silica fume, high-efficiency water reducer, steel fiber, etc. Due to the high cost of some components, the popularization and application of reactive powder concrete in practical engineering is restricted to a certain extent. On the other hand, fly ash and other slags are one of the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B40/02
CPCC04B28/04C04B40/0263C04B2201/50C04B2201/52C04B14/06C04B14/48C04B18/08C04B18/146C04B16/082C04B24/14C04B2103/302C04B2103/0068
Inventor 金凌志付强李月霞万冬伟
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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