(一) 关于水泥品种对回弹测强的影响,有关文献资料看法不一,在国外: 日本材料试验协会,在1958年关于采用回弹测强的指示(草案)中指出:普通水泥、早强水泥及高炉矿渣水泥制备的混凝土的“R-N”曲线是非常接近的,无须进行修正; (a) Regarding the influence of cement varieties on rebound strength, the opinions of relevant literature and materials are mixed. Overseas: The Japan Material Testing Association pointed out in 1958 the instruction on the use of rebound strength measurement (draft): ordinary cement, early The “RN” curve of concrete prepared from strong cement and blast furnace slag cement is very close and does not require correction;