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Method for preparing reactive powder concrete for construction member by utilizing coal gangue

A technology of active powder and coal gangue powder, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of reducing cement durability, cement efflorescence, unfavorable production, etc., to reduce raw material costs, The effect of protecting the ecological environment and promoting comprehensive utilization

Active Publication Date: 2013-05-08
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical activation of coal gangue at home and abroad is to study the development of activity from the aspects of particle gradation and chemical structure changes. There is no systematic study on the reaction mechanism of mechanochemistry. For example, the activity of coal gangue is caused by mechanical impact. The change of crystal particle structure is caused by the refinement of particles due to grinding; alkali excitation is the most commonly used chemical activation method at present, but this method will cause efflorescence of cement and reduce the durability of cement. Alkali-aggregate reaction will occur in concrete; the effect of thermal activation is better, and the side effects are less, but the activation process parameters are not easy to control, and it is not conducive to large-scale production
[0007] The purpose of the present invention is to use industrial waste coal gangue to prepare active powder concrete, replace part of cement and silica fume with activated coal gangue powder, solve the problems of high raw material cost of active powder concrete and environmental pollution of coal gangue, and promote the large-scale development of active powder concrete materials Scope application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] (1) Use a jaw crusher to crush the gangue into particles smaller than 5mm, put it into an SM-500 ball mill, and grind for 1 hour; after grinding, use a tube furnace to fully calcine at 700°C; add 0.2% alcohol The amine active activator is fully mixed, put it into the SM-500 ball mill again, and grind for 1 hour, the specific surface area reaches 840m 2 / kg, spare; select cement, silica fume, river sand, steel fiber, high-efficiency water reducer, among which cement is ordinary Portland 42.5 cement; silica fume is 20000m 2 / kg, SiO 2 The content is greater than 95%; the river sand is screened and washed and dried, and the particle size range is 0.18-0.60mm; the mixing water is drinking water; the steel fiber is copper-coated flat steel fiber, the diameter is 0.18-0.20mm, and the aspect ratio The tensile strength is greater than 60, and the tensile strength is greater than 1800MPa; the high-efficiency water reducer is an early-strength polycarboxylate water reducer, and ...

example 2

[0041] (1) Use a jaw crusher to crush the gangue into particles smaller than 5mm, put it into an SM-500 ball mill, and grind for 1 hour; after grinding, use a tube furnace to fully calcinate at 800°C; add 0.4% alcohol The amine active activator is fully mixed, put it into the SM-500 ball mill again, grind for 1 hour, and the specific surface area reaches 900m2 / kg, and set aside; select cement, silica fume, river sand, steel fiber, and high-efficiency water reducer, among which cement is Ordinary Portland 42.5 cement; silica fume is 20000m 2 / kg, SiO 2 The content is greater than 95%; the river sand is screened and washed and dried, and the particle size ranges from 0.18 to 0.60mm; the mixing water is drinking water; the steel fiber is copper-plated flat steel fiber with a diameter of 0.18 to 0.20, and the aspect ratio is greater than 60, the tensile strength is greater than 1800MPa; the high-efficiency superplasticizer is an early-strength polycarboxylate superplasticizer, an...

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Abstract

The invention provides a method for preparing a reactive powder concrete for construction member by utilizing coal gangue. The method is characterized by comprising steps of: activating industrial solid waste coal gangue through mechanical activation, thermal activation and chemical activator; preparing the reactive powder concrete by using the activated coal gangue powder to substitute a quartz powder, part of cement and silica fume; and preparing a 200 grade reactive powder concrete under normal pressure, and hot water curing condition below 100 DEG C. Solid waste coal gangue is used to substitute a natural resource, so as to reduce raw material cost of the reactive powder concrete; therefore, the invention is of great significance in environmental protection, comprehensive utilization of solid waste and promotion on sustainable development.

Description

technical field [0001] The invention relates to the technical field of preparing concrete by using industrial solid waste, in particular, relates to a method for preparing active powder concrete by using coal gangue. Background technique [0002] Reactive powder concrete is a cement-based composite material with ultra-high strength, high toughness, durability and good volume stability. It was successfully developed in 1993 by Bouygues, one of the largest construction companies in France. The salient features of reactive powder concrete are its high strength, high toughness, high flexural strength and high durability. [0003] In recent years, reactive powder concrete has become one of the domestic research hotspots. For example, Qin Weizu of Tsinghua University used cement, fly ash and silica fume ternary cementitious material system to carry out experimental research on reactive powder concrete. The compressive strength of reactive powder concrete prepared exceeds 200MPa,...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/12
CPCY02W30/91
Inventor 耿春雷陈红岩刘艳军
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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