【摘要】 混凝土受冻临界强度和负温强度发展是冬季施工主要参数 ,因此研究了掺与未掺防冻剂的C6 0高强混凝土在标准养护及 - 15℃条件下强度发展规律 ,测试了在标准养护下混凝土的 2 8d抗压强度 (f2 8) ,并研究了具有一定初始强度的C6 0高强混凝土置于 - 15℃条件 7d再转入标准养护 2 8d的抗压强度 (f-7+ 2 8) .通过对C6 0高强混凝土f-7+ 2 8与f2 8的比值 ,确定了掺防冻剂C6 0高强混凝土的抗冻临界强度 .研究结果表明 :掺防冻剂的C6 0高强混凝土在标准养护及 - 15℃条件下的抗压强度增长率均比未掺防冻剂的C6 0高强混凝土的大 .掺防冻剂的C6 0高强混凝土达到 16 .4MPa的抗冻临界强度后 ,负温冻结对其抗压强度的损伤很小 ,该混凝土可以进行冬季施工更多还原

【Abstract】 Frose-resisting critical strength and strength development at minus-temperature of concrete in winter are very important parameters.The strength of C60 grade of high strength concrete (HSC) with or without the antifreezing admixture is investigated under standard curing conditions and at 15 degree below zero. And the compressive strength of concrete on 28th day ( f 28 ) is measured under standard curing conditions. The strength of the HSC ( f -7+28 ) with some initial strength is researched under Standard 28 day curing conditians after being cured at 15 degree below zero for 7 days. The frost-resisting critical strength of HSC of C60 is decided at the ratio of f -7+28 to f +28 of HSC. Research results show: the increasing ratio of compressive strength of HSC with the antifreezing admixture is larger than the HSC without antifreezing admixture under standard curing conditions at 15 degree below zero. The HSC of C60 with antifreezing admixture is up to the critical strength of 16.4MPa.The effect of minus-temperature frost on compressive strength is very small. The HSC may be used for concreting construction in winter.更多还原