A kind of high environmental protection concrete aggregate and preparation method thereof

Abstract

The invention relates to a high-environment-friendliness concrete aggregate which is prepared from the following raw materials in parts by weight: 100-140 parts of coal gangue detritus, 40-60 parts of casting waste sand, 10-30 parts of nickel slag, 20-40 parts of regenerated diatomite detritus, 3-7 parts of conjugate fibers and 5-9 parts of 0.5 mol / L sodium hydroxide solution. The regenerated diatomite detritus is prepared from the following components in parts by weight: 40-60 parts of pulpous waste diatomite, 20-30 parts of modified steel slag micropowder, 6-10 parts of surface modifier and 0.04-0.06 part of foaming agent. The modified steel slag micropowder is prepared from steel slag and sodium metaborate which accounts for 1 / 10-1-2 of the steel slag. The method detects a direction for large-scale application of coal gangue, casting waste sand, nickel slag, steel slag and waste diatomite, changes wastes into valuable substances, reduces the environmental pollution and land occupation caused by solidified wastes, further utilizes the resources, and implements energy saving and environmental protection. The concrete aggregate has the advantages of high density, low water absorptivity, high strength, low powdering tendency, favorable fire resistance, high weather resistance and wide applicability, and is suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-environmental protection concrete aggregate and a preparation method thereof. Background technique [0002] Solidified waste, such as coal gangue, foundry waste sand, nickel slag, steel slag, waste diatomite, etc., the government invests a lot of money every year to bury and incinerate them. Deep burial seriously wastes precious land resources, and the incineration produces The entry of sulfide into the atmosphere will destroy the ozone, and the smog produced will cause environmental pollution such as smog. Therefore, the utilization of solidified waste has very important practical significance and value. [0003] At present, many solidified wastes are used to prepare concrete aggregates, so as to turn waste into treasure, reduce environmental pollution, greatly reduce construction costs, and have huge economic benefits. However, due to improper material select...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low density, high water absorption, low strength, easy pulverization, poor fire resistance, low aging and weather resistance and easy scattering of aggregates in use in concrete aggregates prepared from solidified waste, the purpose of the present invention is to Provide a high-environmental protection concrete aggregate and a preparation method thereof. The concrete aggregate of the present invention has high density, low water absorption, high strength, is not easily pulverized, has good fire resistance, high aging resistance and weather resistance, and the aggregate is not easy to Scattering, wide application range, suitable for promotion