现将本准则(试行)的概要说明如下。准则的宗旨大体积混凝土结构物,由水泥水化热所产生的裂缝的宽度较大,对其耐久性、水密性、美观,甚至有时对其屈服极限也有影响,因而往往成为一个大问题。过去一说大体积混凝土,一般都指大坝混凝土。但近年来钢筋混凝土或予 The outline of this standard (trial) is now described as follows. Principles of the Guidelines Massive concrete structures, due to the large width of cracks produced by the hydration heat of cement, have an impact on their durability, water-tightness, aesthetics, and sometimes even their yield limit, and therefore often become a big problem. In the past, mass concrete was generally referred to as dam concrete. But in recent years reinforced concrete or