Ceramsite concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and particularly discloses ceramsite concrete and a preparation method thereof. The ceramsite concrete is prepared from the following raw materials in parts by weight: 300-400 parts of cement, 250-350 parts of modified ceramsite, 10-20 parts of an additive, 800-1000 parts of fine aggregate, 150-250 parts of water, 80-120 parts of sodium bentonite and 80-120 parts of fibers. The modified ceramsite is obtained by loading nano magnesium oxide on natural ceramsite, coating with a mixed solution of resin, silica powder, a silane coupling agent and a pore-forming agent, drying and modifying. The preparation method comprises the following steps: soaking the modified ceramsite in water, absorbing water until the modified ceramsite is saturated, mixing and stirring the saturated modified ceramsite and the additive, adding water, stirring, adding cement, fine aggregate, sodium bentonite and fibers, and mixing and stirring to obtain the ceramsite concrete. The concrete is high in strength, and the internal curing effect is improved, so that the problem of concrete drying shrinkage is solved.

Description

technical field [0001] The application relates to the technical field of concrete, more specifically, it relates to a kind of ceramsite concrete and a preparation method thereof. Background technique [0002] Due to the rapid development of the construction industry, there are many new requirements for concrete. Lightweight concrete made of ceramsite has a small bulk density, and can be used not only as thermal insulation material, but also as load-bearing structure, and has a wide range of applications. In addition, because ceramsite has a certain water absorption, adding a certain amount of saturated ceramsite to concrete can release water from the interior of the concrete to maintain the concrete, which can effectively reduce the self-shrinkage caused by the internal drying of the concrete and prevent cracks in the concrete. One of the research and development hotspots of high performance concrete. [0003] However, the production of ceramsite in my country is basically...

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Problems solved by technology

[0003] However, the production of ceramsite in my country is basically based on high-temperature sintering process. The surface of ceramsite is vitrified and has fewer capillary pores. Because of the low water absorption rate, the pre-storage water volume as an internal maintenance carrier is low, and the internal maintenance effect is not obvious. In dry construction In the environment, due to the accelerated evaporation rate of water, the internal curing effect is seriously affected, especially the drying shrinkage of high-strength concrete is relatively large, and the low water absorption of ceramsite concrete still limits the application of high-strength lightweight concrete