【摘要】 用超高强混凝土浇注了尺寸为1 m×1 m×1 m的4组大体积构件,所用混凝土最低水胶比为0.16,最高胶凝材料用量达900 kg/m3,矿物掺料最高掺量为50%。分析了所用胶凝材料的水化热,测试了混凝土的水化放热温升及构件内外温差,试验表明:矿物掺合料的加入,显著降低了胶凝材料的水化热。同时,由于混凝土水胶比极低,胶凝材料水化程度较小,文中制备的大体积混凝土水化放热温升最高为52℃,混凝土构件的内外温差最高只有23℃。保温层增加了大体积混凝土温升的同时,对混凝土的降温速度的控制及降低混凝土内外温差是有利的。在有保温层的条件下,超高强混凝土完全可以用于大体积工程。更多还原

【Abstract】 This investigation aims to explore temperature rise and temperature difference between center and surface of concrete caused by hydration of super high strength mass concrete with 1 000 mm×1 000 mm×1 000 mm test samples which has a minimum water/binder ratio of 0.16,a maximum binder content of 900 kg/m3,and highest 50% replacement of cement.The research conformed that the addition of mineral additives significantly diminishes the heat of hydration caused by hydration of binders.Since water/binder ratio of concrete is very low,so is the hydration degree of binder,the maximum temperature rise of 52 ℃ and maximum temperature difference of 23 ℃ were measured.The thermal insulation layer increases the temperature and temperature rise of concrete,and reduces the temperature disparity between the center and surface of the concretes.The results indicate that super high strength concrete can be applied into mass concrete construction when thermal insulation layer is used at the same time.更多还原