Modified calcium oxide type expanding agent with controllable expansion course and preparation method thereof

Abstract

The invention discloses a modified calcium oxide type expanding agent with a controllable expansion course and a preparation method thereof. The specific surface area of the modified calcium oxide type expanding agent is 300m<2>/kg to 500m<2>/kg; the modified calcium oxide type expanding agent is prepared by coating calcium oxide clinker with rosin resin acid and uniformly mixing the calcium oxideclinker with a coagulation regulation component; the mass ratio of the calcium oxide clinker to the rosin resin acid to the coagulation regulation component is (990 to 996) to (2 to 8) to 2. When themodified calcium oxide type expanding agent is applied, the expansion course of the calcium oxide type expanding agent can be remarkably regulated and expansion energy loss of the calcium oxide typeexpanding agent at a concrete plastic stage is reduced; more beneficial expansion is generated in a concrete hardening process and a shrinkage compensating effect of the calcium oxide type expanding agent is efficiently expressed.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a modified calcium oxide expansion agent with controllable expansion history and a preparation method thereof. Background technique [0002] Concrete cracking often shortens the service life of engineering structures, reduces the safety of structures, and seriously threatens people's lives and property safety. Concrete self-shrinkage, drying shrinkage, temperature shrinkage and other shrinkage deformations will form tensile stress under constraint conditions, which is an important cause of cracking. In order to improve the crack resistance of concrete, an expansive agent can be added to the concrete to produce expansion deformation, reduce or offset the unfavorable shrinkage deformation, that is, to compensate for shrinkage. At present, this shrinkage compensation technology has been widely used in waterproof concrete and thin-walled structural concrete. [0003] Calcium oxide...

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Problems solved by technology

[0022] Aiming at the problem that the early hydration reaction of calcium oxide expansion agents is too rapid, and a large amount of expansion energy is consumed in the plastic stage of concrete and cannot form effective expansion, the present invention proposes a modified calcium oxide expansion agent for concrete with a controllable expansion process and its The preparation method can effectively control the expansion process of the calcium oxide expansion agent, increase the expansion energy reserve in the hardening stage of the concrete, and can better reduce or offset the unfavorable shrinkage deformation of the concrete

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