近年来以日本本州四国连接桥下部工程为代表的混凝土工程推进了混凝土构筑物的超大型化,为了防止大体积混凝土裂缝和满足快速施工的需要,有必要开发新的预冷工艺,来满足混凝土浇注温度控制在10℃以下的界限。该新预冷工艺是利用-196℃的液氮来制造-10℃—100℃的冷却集料(冷却砂),然后再与其他 In recent years, the concrete works represented by the lower part of Japan’s Honshu Shikoku Bridge have promoted the oversize of concrete structures. In order to prevent cracks in large volumes of concrete and to meet the need for rapid construction, it is necessary to develop new pre-cooling techniques to satisfy concrete pouring. The temperature is controlled below the limit of 10°C. The new pre-cooling process uses liquid nitrogen at -196°C to produce a cooling aggregate (cooling sand) at -10°C to 100°C, and then with other