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本实验主要研究负温(-3℃)养护条件、水灰比、龄期对混凝土抗压强度的影响规律。通过测定持续负温养护条件和标准养护条件下三种水灰比(0.24、0.31、0.38)混凝土试块在不同龄期下的抗压强度值,分析混凝土强度增长机理和抗压强度影响因素,得出负温养护条件对三种水灰比混凝土抗压强度增长有明显的抑制作用,前7 d内影响最明显,随着龄期的增加影响逐渐减弱,而且对水灰比为0.24的混凝土抗压强度造成了不可恢复的损伤;低水灰比由于水含量的不足导致其后期混凝土抗压强度较低,高水灰比会由于混凝土内部结冰量较大,体积发生膨胀形成微裂缝,导致其后期抗压强度不高,故存在着与养护温度对应的最优水灰比。
The experiment mainly studied the negative temperature (-3 ℃) conservation conditions, water-cement ratio, age of the concrete compressive strength of the law. By measuring the compressive strength of concrete blocks under three different water-cement ratios (0.24,0.31,0.38) at different time under the conditions of continuous negative temperature curing and standard curing conditions, the growth mechanism of concrete strength and the influencing factors of compressive strength were analyzed. It was concluded that the negative temperature curing conditions significantly inhibited the compressive strength of three kinds of concrete with water-cement ratio, the most obvious effect was in the first 7 days, the effect was weakened gradually with the increase of age, and the concrete with water-cement ratio of 0.24 Compressive strength caused by the irreversible damage; low water-cement ratio due to the lack of water content resulting in its low compressive strength of concrete later, high water-cement ratio will be due to the large amount of concrete inside the ice, the volume of expansion occurred to form micro-cracks, Resulting in its late compressive strength is not high, so there is the optimal water temperature and curing temperature corresponding to the water-cement ratio.