摘要
目的针对低温条件下东北地区冬季施工特征,研究不同养护制度、水灰比、龄期对普通C30混凝土幼龄期抗压强度以及幼龄期抗冻临界强度的影响.方法采用一次冻结法,在-20℃的条件下养护7d,以混凝土在后期继续标准养护条件下强度增长的百分率(95%)作为评价标准.结果得出不同养护温度条件下混凝土的幼龄期抗压强度,以及标准养护条件下表干状态与表面浸润状态下混凝土的抗冻临界强度.结论水灰比在0 4～0 6的范围内,随着水灰比的增大,表干状态混凝土达到抗冻临界强度的时间由12h增加到26h,浸润状态混凝土达到抗冻临界强度的时间由36h增加到70h,而且在冬季施工低温环境中浸润状态混凝土所需的抗冻临界强度为8 5～9MPa,远大于表干状态混凝土的抗冻临界强度2 5～3MPa.
This paper explores the effects of different curings W/C and ages on the infant strength and the infant resistant freezing critical strength of concrete 30 and attains the infant strengths under different temperature curings and the resistant freezing critical strengths of the different kinds of W/C concrete with the dry and wet face state by use of the once artificial freezing method according to the standard-95% of strength cured under standard condition.In conclusion,the time to attain the resistant freezing critical strength of concrete with dry face and wet face increases from 12h to 26h and from 36h to 70h with the increase of W/C from 0.4 to 0.6.The resistant freezing critical strength of wet face concrete is 8.5～9MPa and the resistant freezing critical strength of concrete with dry face is 2.5～3MPa.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
2005年第3期228-231,共4页
Journal of Shenyang Jianzhu University：Natural Science
基金
辽宁省高等学校新世纪优秀人才资助项目(2004101)
