Influence of Serpentinite Coarse Aggregates on Biological Shielding Concrete
In order to study the effect of serpentine coarse aggregate on the bio-shielding concrete,continuous graded serpentine coarse aggregate with particle sizes of 5-16 mm,5-20 mm,5-25 mm,and 5-31.5 mm were selected to formulate four groups of bio-shiel-ding concretes,and the compressive strength,splitting tensile strength tests of the concretes as well as the γ-ray shielding performance,crystalline water high temperature stability study were carried out at different temperatures(25℃,200℃,300℃,400℃,and 500℃),and micro-mechanism analysis was performed by X-ray diffractome-ter and scanning electron microscope.The results show that when the coarse aggregate par-ticle size is 5-31.5 mm,the performance of serpentine concrete is improved better,and its 28 d compressive strength,split tensile strength and μ-value are increased by 26.36%,20.3% and 7.1% respectively compared with that of the smallest particle size group;un-der the high temperature environment,the compressive strength and split tensile strength of serpentine concrete are both increased with the increase of the coarse aggregate particle size;with the increase of temperature,the compressive strength shows a trend of first in-creasing and then decreasing,and is always higher than the 28 d compressive strength val-ue,while the splitting tensile strength shows a decreasing trend in general;the high-tem-perature stability of the internal crystalline water of the concrete with 5-25 mm and 5-31.5 mm particle size is better than the other two groups,and the neutron shielding per-formance is stronger;the microscopic test shows that the increase in the particle size of the coarse aggregate promotes the consumption of cement clinker,the hydration reaction is more thorough,the internal pores are filled,the structure becomes dense,and the high-temperature radiation protection performance is improved.
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