Gypsum and calcium oxide melt inclusion expansion clinker, concrete expansion agent, and preparation method and application thereof

Abstract

The invention relates to a gypsum and calcium oxide melt inclusion expansion clinker, a concrete expansion agent, and a preparation method and application thereof, belonging to the field of construction materials. The expansion clinker provided by the invention is prepared by mixed grinding and high-temperature burning of limestone, gypsum and aluminum oxide and / or aluminum sulfate. The concrete expansion agent is prepared by grinding the expansion clinker together with a calcium sulphoaluminate cement clinker, calcium stearate or / and triethanolamine until the specific surface area is 140-400 m<2> / kg. According to the invention, the expansion clinker has high restrained expansion rate and high clinker weathering resistance; the concrete expansion agent has the functions of cracking resistance, seepage resistance, shrinkage compensation and the like, and has the advantage of long product shelf life (up to 6 months). The concrete expansion agent can be used for cracking resistance and seepage resistance of a common concrete structure, and can greatly enhance the durability of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures for building materials, in particular to a concrete expansion agent with gypsum and calcium oxide fusion inclusions, a preparation method thereof and its application in improving the shrinkage resistance performance of concrete. Background technique [0002] Cement concrete is currently the largest building material in the world, with low price and wide application. However, cement concrete is prone to shrinkage and cracking. Among them, drying shrinkage (including self-drying shrinkage) and temperature shrinkage are the two most important shrinkages, which seriously affect the durability of concrete. In order to solve the problem that cement concrete is easy to shrink and crack, researchers have invented expansive cement or concrete expansion agent. Especially concrete expansive agent is favored for its convenience and flexibility. So far, there are many patent documents about concr...

AI Technical Summary

Problems solved by technology

This kind of concrete expansion agent has the disadvantages of poor weathering resistance of clinker and short storage time of expansion agent

[0012] All of the above expansion agents contain free calcium oxide, and the minerals that wrap free calcium oxide are mainly C 3 S or calcium-iron solid solution or gypsum-calcium oxide solid solution, there are common problems such as easy weathering of expanded clinker, short storage period of clinker, and short shelf life of finished expansion agent after grinding, so it needs to be improved.

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