Hydration heat inhibition type concrete expanding agent and preparation method thereof

Abstract

The invention discloses a hydration heat inhibition type concrete expanding agent and a preparation method thereof. The hydration heat inhibition type concrete expanding agent is prepared by compounding hydration heat inhibition type expanding clinker and gypsum, wherein the hydration heat inhibition type expanding clinker is prepared from the following raw materials in parts by weight: 50 to 70 parts of limestone, 5 to 15 parts of the gypsum, 2 to 5 parts of iron slag, 10 to 20 parts of bauxite and 0.1 to 3.0 parts of metal ions or metal oxide; the raw materials are fired at high temperatureby adopting an ion doping technology to prepare the hydration heat inhibition type concrete expanding agent. The preparation method provided by the invention is simple and feasible and the calcinationtemperature of expanding agent clinker is effectively reduced.

Description

Technical field [0001] The invention belongs to the technical field of concrete, and particularly relates to a hydration heat inhibited concrete expansion agent and a preparation method thereof. Background technique [0002] Due to the use of finer and finer cement in modern concrete, the strength of concrete has developed rapidly, making concrete cracks that only appear in mass concrete appear in various engineering projects. Concrete shrinkage, especially drying shrinkage and temperature shrinkage, are one of the main reasons for the early cracking and deformation of concrete. Therefore, effective control of the early cracks of concrete must be considered from the two aspects of reducing shrinkage and reducing hydration heat. [0003] The Chinese Patent No. CN201110053668.9 relates to an expanded clinker, which is made by mixing limestone and iron powder as raw materials and then calcining. Among them, the content of calcium carbonate in the raw materials is 48-53% by weight base...

AI Technical Summary

Problems solved by technology

The expansive agent has a short expansion and stability period, which is not conducive to inhibiting concrete cracking in the later stage

[0005] In engineering, the self-shrinkage and drying shrinkage of concrete are generally compensated by adding a certain amount of expansion agent. At present, the commonly used expansion agent in my country is still calcium expansion agent, but the calcium expansion agent hydrates quickly in the early stage and releases heat rapidly. It is not conducive to controlling the temperature rise of hydration, so it is urgent to prepare a hydration heat-inhibiting expansion agent with large early expansion energy, long expansion stability period, and suppression of hydration temperature rise to solve the above problems

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