Environmental-friendly functional aggregate-based high-homogeneity radiation-resistant concrete

Abstract

The invention relates to environmental-friendly functional aggregate-based high-homogeneity radiation-resistant concrete. The concrete consists of water, a cementing material, a fine aggregate, a coarse aggregate, a tackifier, a water reducing agent and fibers, wherein the cementing material consists of cement and a mineral admixture; the mineral admixture consists of silica fume and coal ash; the fibers are polypropylene fibers, wherein 1m<3> of concrete comprises the following components: 140 to 160 kg of the water, 300 to 500 kg of the cement, 20 to 60 kg of the silica fume, 30 to 70 kg of the coal ash, 700 too 800 kg of the fine aggregate, 1,000 to 1,300 kg of the coarse aggregate, 0.35 to 1.9 kg of the tackifier, 2.1 to 7.5 kg of the water reducing agent, and 0.6 to 1.0 kg of the polypropylene fibers. The demixing degree of the concrete can be reduced to 0.05; and the concrete has the characteristics of high rheological property, high strength property and durability, and can realize resource utilization of heavy metal-containing urban sludge, mud or industrial waste.

Description

technical field [0001] The invention belongs to the field of radiation shielding building materials, and in particular relates to a highly homogeneous radiation-proof concrete based on environment-friendly functional aggregates. Background technique [0002] As a mature, clean, safe and competitive technology, nuclear energy will make a significant contribution to the sustainable development of mankind in the 21st century and beyond. With the rapid development of nuclear energy utilization, the radiation-proof concrete used to shield X, γ and other rays brought by nuclear reactors also needs further research on its development and optimization of its performance. The invention uses the environment-friendly functional aggregate with urban silt, sludge or industrial silt as raw materials, and optimizes the performance of the radiation-proof concrete while utilizing the silt as a resource. Homogeneity is an important index for evaluating the performance of concrete. The use o...

AI Technical Summary

Problems solved by technology

Poor homogeneity of radiation-proof concrete will lead to the following problems: First, radiation-proof concrete bears the important responsibility of shielding radiation. If the homogeneity of concrete is poor, the stratification of aggregates will be serious, which will increase the cracking tendency of concrete. Moreover, the uneven distribution of aggregates will lead to more defects such as air pockets, micropores, and interface cracks in the concrete, so that the radiation protection performance of the radiation-proof concrete cannot achieve the expected shielding effect; second, the poor homogeneity of the concrete will lead to After the concrete is hardened, its structure shows microscopic and macroscopic inhomogeneity, which not only reduces the mechanical properties of concrete, but also has a negative impact on the durability of concrete.

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