在进行水工建筑物混凝土的设计时,经常遇到大体积(结构横断面尺寸在2.5公尺以上者)工程,为重力壩、重力拱壩等,虽然在ΓОСТ4795-53中已提出,按大体积建筑物所处的位置而划分为外部区域的混凝土和内部区域的混凝土两种,同时按照混凝土断面与钢筋间距的一般规范,又允许适当采用大骨料粒经混 In the design of hydraulic concrete structures, often encounter large-size (structural cross-sectional size of 2.5 meters or more) project, gravity dam, gravity arch dam, although in ΓОСТ4795-53 has been proposed, according to the large Volume of buildings in the location and divided into external areas of the concrete and the internal area of ​​the two kinds of concrete, at the same time in accordance with the general specifications of concrete cross-section and spacing of steel, but also allow the appropriate use of large aggregate particles mixed