散裂中子源工程防中子辐射重混凝土配合比研究

EXPERIMENTAL RESEARCH ON THE MIX PROPORTION OF NEUTRON RADIATION RESISTANT HEAVY CONCRETE IN CHINESE SPALLATION NEUTRON SOURCE FIRST-STAGE PROJECT

中国散裂中子源一期工程中需要采用C30防中子辐射重混凝土,重混凝土表观密度不低于3600 kg/m^3 ,为了防中子辐射,每方混凝土中氢原子含量不低于12kg,硼原子不低于0.7kg。针对该项目的特殊要求,开展了专项试验研究,通过大量的原材料筛选和配合比试验,最终以硼玻璃粉引入硼原子,高含水铁矿砂引入部分结合水,以铁砂、重晶石砂和重晶石作为重质骨料,优选粗细骨料来源和级配,配制出性能满足需要的防中子辐射重混凝土,并成功应用到实际工程中。

In the Chinese Spallation Neutron Source first-stage project, it is necessary to use C30 neutron radiation resistant heavy concrete. The apparent density of heavy concrete is not less than 3 600 kg/m^3;in order to prevent neutron radiation, the hydrogen atom content of each cubic meter concrete is not less than 12 kg, the boron atom of each cubic meter concrete is not less than 0.7 kg. In response to the special requirements of the project, special experimental research was carried out. Through a lots of raw materials and concrete mix proportion experiments, boron glass powder was used to introduce boron atom, high hydrated iron ore sand was used to introduce some bound water, iron sand, barite sand and barite was used as heavy aggregate, and aggregate source and gradation were selected,at last neutron radiation resistant heavy concrete was prepared and successfully applied in practical engineering.