Shrinkage-free low-grade cement based radiation shield concrete and preparation method thereof

Abstract

The invention belongs to the field of concrete, and specifically discloses shrinkage-free low-grade cement based radiation shield concrete and a preparation method thereof. The concrete comprises thefollowing materials in parts by weight: 280-320 parts of cement, 900-1200 parts of fine aggregates, 1200-1500 parts of coarse aggregates, 10-20 parts of a neutron-absorbing agent, 0.4-0.6 part of a water reducing agent, and 140-160 parts of water. The concrete meets the requirement on the strength of C30 concrete, and is free of separation, and high in collapsbillity and expansion degree; the volume weight ranges from 2800-2900kg.m3; the limited expansion rate of the concrete in 28d under the water maintaining condition ranges from 0.006-0.008%; and meanwhile, the concrete has the characteristics of being outstanding in working performance, high in radiation resisting performance, and low in cost; the problems such as easy separation, low homogenizing performance and low construction performance of traditional radiation preventing concrete can be solved; and the requirements on special performances such as non-shrinkage performance, micro expansion performance, cracking resisting performance and impervious performance of the radiation preventing concrete can be met.

Description

technical field [0001] The invention belongs to the field of concrete, and specifically discloses a non-shrinkage micro-expansion cement-based radiation-proof concrete and a preparation method thereof. Background technique [0002] Radiation exists throughout the universe and can be divided into natural radiation and artificial radiation. Natural radiation mainly comes from cosmic rays, etc. Artificial radiation mainly comes from α, β, γ, X and neutron streams and other rays produced in the process of applying nuclear technology in nuclear power, military, education, medical treatment, scientific research and other fields. After being exposed to these rays for a long time, it is easy to induce cancer, leukemia, thyroid dysfunction, infertility, birth defects and other diseases, and it is also easy to induce gene mutations in other animals or plants. In order to prevent radiation from harming human beings, when building buildings with radiation sources, it is generally neces...

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Problems solved by technology

The annual discharge of copper slag in my country is huge, and most of them are in the state of accumulation and storage. At present, the stock of copper slag in my country has already exceeded 50 million tons, which not only occupies land, pollutes the environment, but also causes a huge waste of resources.

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