Modifier for high-liquid-limit clay pavement

Abstract

The invention relates to a modifier for a high-liquid-limit clay pavement. According to the modifier, the basic principle is that a series of physical and chemical reactions of inorganic binders and high-liquid-limit clay are utilized, the liquid limit and the plastic index of the high-liquid-limit clay are reduced to the maximum degree, the unconfined compressive strength and the CBR strength areimproved, and the requirement for the performance of the high-liquid-limit clay pavement in the specification is met. The modifier for the high-liquid-limit clay pavement is prepared from the following raw materials in parts by weight: 107-143 parts of flue gas desulfurization gypsum, 95-122 parts of phosphogypsum, 88-117 parts of red mud, 66-158 parts of lime and 380-460 parts of pulping white mud. According to the modifier, the doping amount of the modifier in the using process is 10-15% of the mass of dry clay, the liquid limit of modified clay is 45-53%, the plastic limit is 33-40%, the plastic index is 13-19, the 7d unconfined compressive strength of the modified clay is 0.4-1.0 MPa, and the soaking 4d CBR strength is 10-20%. The modifier has the advantages that multiple industrial solid waste compound modification is adopted, so that the high-liquid-limit clay is modified from standard waste clay which is not allowed to be used into a roadbed filler capable of being utilized, meanwhile, the construction performance and strength of the high-liquid-limit clay are improved, and the construction cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of high liquid limit clay roadbed reinforcement, and in particular relates to a high liquid limit clay modification technology applicable to the roadbed filling process. Background technique [0002] High liquid limit clay refers to clay with a particle size of less than 0.075 mm, a fine particle content of more than 50%, a liquid limit of more than 50%, and a plasticity index of more than 26. High liquid limit clay is widely distributed in more than 40 countries and regions between 60° north latitude and 50° south latitude, crossing the equator across the northern and southern hemispheres and covering six continents. my country is one of the countries with the widest distribution of high liquid limit clay, especially in the middle and lower reaches of the Yangtze River and the Yellow River, as well as the southern coastal and southwest regions, where high liquid limit clay is most developed and widely distr...

AI Technical Summary

Problems solved by technology

[0008] At present, the modified external admixtures commonly used in engineering are mostly inorganic binders such as lime and fly ash with low price and good reinforcement effect. The production process of quicklime consumes a large amount of non-renewable clay minerals and energy, and produces a large amount of CO 2 , SO 2 and other harmful greenhouse gases, and the current production is limited, and the output is greatly reduced; moreover, the dosage of quicklime is as high as 6%, and the cost is high

During the construction process, there is a lot of dust and environmental pollution

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