摘   要：研究了不同细度与掺量重晶石对赤泥水泥砂浆水化28d强度及放射性的影响。结果表明：利用重晶石来取代砂可以有效屏蔽赤泥水泥砂浆的放射性，但同时会影响到砂浆的28d抗压、抗折强度；当粒度相同时，屏蔽物重晶石的掺量越高，放射性的屏蔽效果越好，当掺量相同时，屏蔽物重晶石的粒度越小，放射性的屏蔽效果越好。当0.2mm以下重晶石取代砂量达到30%时，所得砂浆的放射性屏蔽率达到了21.2%，此时砂浆的内、外照射指数分别为0.16、0.25，放射性总比活度降低到214.4Bq/kg。

Abstract: The impact of barite content and fineness on the 28d strength and radioactive of the red mud cement mortar was studied. The results show that: the radioactive of the red mud cement mortar is shielded by replacing sand with barite, but the 28d compressive and flexural strength of the mortar are changed at the same time; the higher the content of barite, the better of the radioactive shield of the results under the same particle size, the smaller the particle size of barite, the better of the radioactive shield of the results under the same barite content. The radioactive shielding rate can reach 21.2% as the amount of barite below 0.2mm instead of sand reaches 30%, the IRa and Ir of the mortar are 0.16、0.25, the total specific activity of the mortar can low to 214.4Bq/kg.