High-flow low-shrinkage C30 concrete capable of shielding radiation

Abstract

The invention relates to high-flow low-shrinkage C30 concrete capable of shielding radiation. The concrete is prepared by mixing cement, mineral powder, fly ash, sand, gravels, additive and water, wherein the concrete comprises the following components in cubic amount kg / m<3>: 220-240 kg / m<3> of cement, 80-125 kg / m<3> of mineral power, 80-35 kg / m<3> of fly ash, 795-820 kg / m<3> of gravels with fineness modulus of 2.3-2.6, 1,000-1,025 kg / m<3> of gravels with maximum particle diameter of not greater than 25 mm, 3.0-4.0 kg / m<3> of additive and 150-155 kg / m<3> of water; the dry density of the concrete is greater than 2,350 kg / m<3>; the content of internal moisture of the concrete is not less than 0.35 percent within all operation time of a structure space cast by using the concrete; the expansion degree of the concrete is 550+ / -75 mm; the contents of cobalt Co, silver Ag and iridium Ir in the cement, the mineral powder and the fly ash are less than 50 ppm respectively; and the contents of europium Eu, samarium Sm, gadolinium Gd, dysprosium Dy and thulium Tm are less than 10 ppm respectively. According to the concrete provided by the invention, shielding can be effectively produced for a proton flow and a neutron flow produced by hospital proton heavy ion equipment; and meanwhile, the concrete has the characteristics of high fluidity and low shrinkage.

Description

technical field [0001] The invention relates to building materials, in particular to a C30 concrete with high fluidity and low shrinkage for shielding radiation. Background technique [0002] After the Shanghai Proton and Heavy Ion Hospital is completed, it will have the most advanced professional hospital for tumor treatment equipment in the world. Due to the complex equipment and extremely high requirements for radiation shielding level, in order to control the amount of radioactivity induced by the concrete shielding wall, a series of extremely high requirements are put forward for the concrete raw materials and crack control for the purpose of radiation shielding in this project. [0003] The proton heavy ion radiotherapy area (hereinafter referred to as the PT area) in the hospital consists of an ion source room, a linear accelerator, a radio frequency room, a synchrotron, the upper and lower sections of the high-energy beam transmission system, four treatment rooms...

AI Technical Summary

Problems solved by technology

However, if barite concrete is used in the construction of proton and heavy ion hospitals, it will be difficult to effectively shield proton rays and neutron rays, and barite concrete also has the problem of poor homogeneity, and it is difficult to ensure its uniformity during construction. Liquidity and Shrinkage

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