Fly ash grouting material and preparation method thereof

Abstract

The invention relates to a fly ash grouting material, and belongs to the technical field of preparation of grouting materials. The grouting material is prepared from a component A and a component B, wherein the component A comprises, by weight, 50-150 parts of fly ash, 5-20 parts of ammonium dihydrogen phosphate, 5-10 parts of potassium dihydrogen phosphate, 1-2 parts of a pH regulator, 0.5-1 partof a defoaming stabilizer and 0.02-0.04 part of chopped fibers; and the component B comprises, by weight, 10-50 parts of magnesium oxide, 2-3 parts of a polymer emulsion, 0.2-0.5 part of a waterproofdispersant, 0.5-5 parts of a retarder and 0.02-0.04 part of an ultrafine filler. The magnesium agent desulfurization fly ash is used as a main raw material, light calcined magnesia, the potassium dihydrogen phosphate and the ammonium dihydrogen phosphate are used as auxiliary gelling materials, and another one or more admixtures are blended to prepare the fly ash grouting material with the advantages of early strength, high strength, high solidifying rate, adjustable setting time, good fluidity, good durability, micro-expansion, low cost, environmental protection and energy saving.

Description

technical field [0001] The invention relates to the technical field of preparation of grouting materials, in particular to a grouting material with industrial solid waste fly ash as the main raw material and a preparation method thereof. Background technique [0002] At present, the most widely used grouting material is Portland cement mixed with admixture grouting material. However, with the rapid development of underground engineering construction in my country, the difficulty of engineering construction is increasing day by day, and the existing Portland-based cement materials are difficult to meet the increasingly stringent requirements. Strict engineering needs and quality requirements. Traditional Portland cement materials have a series of problems such as slow setting speed, low early strength, limited use conditions, and high energy consumption in material production. The development of new engineering materials is imminent. [0003] Fly ash is an industrial solid wa...

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Problems solved by technology

[0013] In the above-mentioned prior art, though phosphate and magnesium oxide are mixed with different additives simultaneously, materials with better comprehensive performance can be obtained; but the magnesium oxide raw materials used in this type of material are mostly dead-burned magnesium oxide (magnesia), which is Magnesite (MgCO 3 ) obtained by calcination at high temperature (above 1300 ° C), the energy consumption of raw materials is high, the carbon emission of processing is high, and it is not environmentally friendly, and the activity of dead-burned magnesia is low, and the reaction rate with phosphate salt is slow, so it is used in low temperature environment restricted

[0014] To sum up, the current large-volume fly ash grouting materials generally use traditional calcium-based desulfurized fly ash as raw materials, and adopt the "fly ash + Portland cement" blending method, most of which have low setting rate and poor fluidity , low early strength, long setting time, poor environmental protection, and limited use conditions; while traditional magnesium-phosphate hydrogel reinforcement materials mostly use dead-burned magnesia, which has the disadvantages of high energy consumption for raw materials and poor environmental protection; therefore, It is Necessary to Study a New Fly Ash Grouting Material

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