重庆市建筑科学研究所广大职工,在开展科学实验活动中,先后选用九十多种化工原料,分成一千五百多组,对沙浆和混凝土进行了早期强度的试验研究。在大量的试验中,找出了两种比较好的早强剂。1.硫酸钠和亚硝酸钠复合剂当掺量分别为1～3%时,对重庆矿渣水泥与相同龄期比较,能提高早期强度70～100%,且对混凝土物理力学性能尚未发现 Many employees of Chongqing Institute of Building Research have selected more than 90 types of chemical raw materials and divided it into more than 1,500 groups in conducting scientific experiments, and conducted early strength tests on mortar and concrete. In a large number of tests, two good early strength agents were identified. 1. When the mixing amount of sodium sulfate and sodium nitrite is 1-3% respectively, compared with the same age, the Chongqing slag cement can improve the early strength by 70-100%, and has not found the physical and mechanical properties of the concrete.