Low heat composite cementing material

Abstract

The invention provides a low heat composite cementing material, the raw materials of which comprise, by weight: 20-50 parts of cement, 40-70 part of fly ash, 5-25 parts of metakaolin, and 0-8 parts of an exciting agent. The cementing material is prepared by placing the above materials into a material mixer in order, and stirring them for 5-15m at a speed of 60-120 r / m under normal temperature and pressure. Application of the cementing material consists of the steps of: placing 88-97 parts by weight of the cementing material, 3-12 parts by weight of an expanding agent 1.0-1.5 parts by weight of a water reducer, and 24-32 parts by weight of tap water into a cement paste blender for blending based on the speed and procedure prescribed by the national building material industry standard JC / T729-2005: carrying out slow stirring for 117-123s at a rotation speed of 135-145 r / m and a revolution speed of 57-67 r / m, then stopping stirring for 14-16s, and then performing stirring again rapidly for 117-123s at a rotation speed of 275-295 r / m and a revolution speed of 115-135r / m for molding. The material provided in the invention is not only suitable to be used as a building material, and also can be used in backfill grouting, toxic waste curing and other special aspects.

Description

technical field [0001] The invention relates to the synthesis of gelling materials, especially the acquisition of low-heat gelling materials, and provides a novel composite gelling material with important practical value. Background technique [0002] Due to the high content of tricalcium silicate, the traditional cement gelling material has a large heat of hydration, which easily causes temperature stress inside the cement concrete, forming voids and cracks, and seriously damages the quality of cement concrete. At present, there are mainly three types of methods in the research of low-heat cementitious materials at home and abroad: one is to reasonably add fly ash, slag and other industrial wastes within the scope of the Portland cement system and its mineral composition, such as slag Portland cement, Composite Portland cement, low-heat micro-expansion cement, etc.; the second is to break through the limitations of the mineral system and scope of Portland cement clinker wi...

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Problems solved by technology

⑤ Lu Difen et al. published an article on "Preparation of Highly Active Metakaolin Micropowder and Research on Composite Effect" in the journal "Concrete" in 2003, 9:28-29, showing that the compounding of metakaolin and fly ash can achieve complementary advantages and overcome Fly ash has the disadvantage of low early strength, but the amount of metakaolin and fly ash is only 5% and 15%, and the research content is less

In summary, the research on reducing the heat of hydration of cement in this field is aimed at applying it to mortar and concrete. The main method is mostly to add fly ash or slag to ordinary Portland cement, and the The amount of fly ash is relatively small, so the heat of hydration is still relatively high. When the amount of fly ash is large, the early strength is low

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