Quick-setting filling cementing material with high fluidity under low-temperature condition

Abstract

The invention discloses a quick-setting filling cementing material with high fluidity under a low-temperature condition, and particularly relates to the field of material science and engineering, and the quick-setting filling cementing material comprises the following raw materials in parts by weight: 50-80 parts of blast furnace slag powder; 8-15 parts of cement clinker; 2-6 parts of an alumina clinker master batch; 3-20 parts of ground steel slag powder; 2-30 parts of gypsum; and 0.2-0.5 part of powder water reducing agent. The blast furnace slag powder is powder formed by grinding blast furnace slag through a ball mill, the specific surface area of the blast furnace slag powder is 400-520 m < 2 > / kg, the cement clinker is powder formed by grinding clay or other raw materials in the Portland cement industry, mixing, calcining at high temperature and then grinding, and the specific surface area is 300-350 m < 2 > / kg. The special cementing material for mine filling is a uniformly mixed finished product, and has the advantages of short cementing time, fast early strength increase, slow later strength increase, good flowability and pumpability, no toxicity, harmlessness, capability of meeting mine filling requirements, simple production process, no pollution and high cost performance.

Description

technical field [0001] The invention relates to the field of material science and engineering technology, more specifically, the invention relates to a high-fluidity fast-setting filling gelling material under low temperature conditions. Background technique [0002] Coal mine filling materials are mainly composed of aggregates and cementing agents. Most of the aggregates are cheap and available materials, such as gangue and aeolian sand, etc., and the insufficient parts are selected nearby for crushing and processing; most of the cementing agents are ordinary mines. Portland cement or slag cement, partially mixed with fly ash, red mud, lime and other materials. [0003] At present, cement is mostly used as cementitious material for coal mine filling, which has the disadvantages of high cost, low strength, poor fluidity, and low roofing rate. In winter, the low temperature will cause long setting time and low early strength, which will lead to inability to remove the formwor...

AI Technical Summary

Problems solved by technology

The filling material has a high water-solid ratio, good hydrophilicity, short gelation time, fast early strength growth, slow strength growth in the later stage, good fluidity and pumpability, non-toxic and harmless, and can meet the requirements of mine filling. The disadvantage is that the product needs to be pumped separately, and two sets of feeding and conveying pipelines are required. For the formed coal mine filling system, the process flow is not very operable; and the modification process of gypsum in this product is more complicated and belongs to high energy consumption. process, high cost and high pollution

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