负温环境下混凝土力学性能及水化特征研究

摘要

The mechanical properties of concrete under low temperature subjected to subzero temperature curing or varied curing conditions were investigated.The development rule of compressive strength and dynamic elastic modulus were obtained.Hydration process and morphology of hydration products were analyzed by microscopic observation.The results show that concrete without anti-freezing agents showed rather low strength at-10 ℃,anti-freezing agents could effectively reduce micro cracks of concrete induced by subzero temperature curing at early hydration stage.%研究了负温养护、交变温度养护下混凝土力学性能的发展情况,揭示了负温混凝土抗压强度、动弹性模量随龄期的变化规律,并利用微观测试方法分析了水泥水化特征和水化产物微观结构形貌.结果表明:在-10℃时,不掺防冻剂的混凝土早期强度极低,甚至由于试件不能成型而无强度;防冻剂可有效减少混凝土早期负温养护引起的微裂缝.