A modified red mud subgrade structure and its construction method

Abstract

The invention provides a sintering process red mud modifier, a modified red mud roadbed and a construction method of the modified red mud roadbed. The sintering process red mud modifier is prepared from, by weight, 153-231 parts of desulphurization gypsum, 77-154 parts of phosphogypsum, 83-230 parts of quick lime and 206-385 parts of cement. According to the basic principle, an inorganic modifiedmaterial and sintering process red mud are subjected to a series of physical and chemical reactions to reduce the pH value of the sintering process red mud and improve the unconfined compressive strength and road performance of the sintering process red mud. The sintering process red mud modified with the modifier has high 7-day and 28-day unconfined compressive strength and has a pH value of 9.80or below. The sintering process red mud modifier, the modified red mud roadbed and the construction method of the modified red mud roadbed have the advantages that multiple industrial solid wastes and a traditional inorganic binder are adopted for compound modification of the sintering process red mud, and thus the sintering process red mud can not only meet environmental protection requirementsand road performance requirements, but also be applied to filling of roadbeds on a large scale.

Description

technical field [0001] The disclosure belongs to the technical field of sintering red mud roadbed filling, and relates to a sintering red mud modifier, a modified red mud roadbed and a construction method thereof. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Sintering red mud is an industrial solid waste produced when alumina is produced by sintering in the aluminum industry. my country is the fourth largest producer of alumina in the world, and the annual discharge of sintering red mud exceeds 30 million tons. As of 2016, my country has more than 40 registered alumina companies, mainly distributed in Shandong, Henan, Guizhou, Shanxi and other provinces. The sintering red mud is polluting and contains a large amount of alkaline minerals. The pH value of the leaching solution is 12.1-12.4, which is close to the "Pollution Control Standards fo...

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Problems solved by technology

Some scholars have carried out research on the modification of sintering red mud. The effect of environmental pollution control is good, and the strength has been improved. However, there is a problem of long-term strength attenuation, and the actual application effect needs to be verified.

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