Impact-resistant nanometer boron nitride-modified concrete

Abstract

The invention discloses an impact-resistant nanometer boron nitride-modified reactive powder concrete. Raw materials of the impact-resistant nanometer boron nitride-modified reactive powder concrete include cement, nanometer boron nitride, silica fume, fly ash, sands, a water reducer and water. The nanometer boron nitride can significantly enhance the dynamic compressive strength, dynamic peak strain and impact toughness of the reactive powder concrete. When the strain rate is in a range of 200-800 / s and the dosage of the nanometer boron nitride is 0.25-0.5%, the dynamic compressive strength of concrete can be increased by 83.8%, the dynamic peak strain can be increased by 30.5%, and the impact toughness can be increased by 94.6%.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an impact-resistant nano boron nitride modified active powder concrete. Background technique [0002] Due to the advantages of high strength, high durability and high volume stability, reactive powder concrete has been gradually used in bridges, high-rise buildings, nuclear power and hydraulic engineering. However, the absence of coarse aggregate in reactive powder concrete results in a large number of (fine) aggregate-matrix interfaces inside the structure. According to the theory of close packing, a large amount of fine powder with a water film on the surface will gather in the interface area, and then increase the pores in the interface area, weakening the overall performance of the concrete material to a certain extent. When subjected to impact or explosion events, the concrete material structure needs to withstand high strain rate loads, and its high strength and...

AI Technical Summary

Problems solved by technology

However, the high price and high content of nanoparticles (1%-10% of cement mass) weaken the application prospect of the material itself in actual engineering.

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