基于抗冻临界强度的桥梁混凝土工程冬季施工研究

Study on Winter Construction of Bridge Concrete Engineering Based on Anti- freezing Critical Strength

通过对C30、C50两种强度等级的混凝土在-5℃、-10℃的环境条件下抗冻临界强度的研究,对混凝土工程冬季施工进行指导。实践表明:工程所用的C30混凝土在-5℃、-10℃的环境条件下,抗冻临界强度分别为13.8MPa、15.2 MPa;C50混凝土在-5℃、-10℃的环境条件下,抗冻临界强度分别为15.7MPa、20.5MPa。在工程具体施工过程中,采用了搭设暖棚法、综合蓄热法等技术手段很好地保证了混凝土前期的强度发展,最终混凝土强度满足设计要求,确保了工程质量。

The guidance on winter construction of concrete engineering -freezing critical strength of concrete with two strength grades of C30 and conditions of -5℃ and - 10℃. The practice shows that： the anti - is performed through the study on anti C50 under environmental temperature freezing critical strength of C30 concrete is respectively 13.8MPa, 15.2MPa under environmental temperature conditions of - 5℃ and - 10℃ ; that of C50 concrete is respectively 15.7MPa, 20.5MPa under environmental temperature conditions of - 5 ℃ and - 10℃. During the specific engineering construction, technological means like method of setting up warm shed and comprehensive heat storage method are adopted, so as to guarantee the strength development of concrete in early period. In the end, the concrete strength can meet the guaranteed. design requirement and the engineering quality is