不同养护制度对混凝土强度和碳化影响试验研究

Experimental Study on the Effect of Different Curing Systems on Concrete Strength and Carbonation

文中分别对同条件养护、自然养护、标准养护和人工养护4种养护方式下,C30、C40混凝土强度和碳化发展规律进行分析,判断混凝土达到的实体强度和碳化深度。结果表明:(1)同条件养护试块抗压强度普遍高于回弹强度5~10 MPa;(2)根据不同季节自然养护强度增长及碳化发展,冬施期间的混凝土强度增长缓慢,需在配合比设计方面提高富裕强度;(3)对比标准、自然、人工养护3种方式可知,自然养护强度低,碳化较严重。由不同养护制度对混凝土强度及碳化的增长规律、特点和相互联系可知,合理的养护方式是快速准确判断混凝土强度的前提,给混凝土施工提供可靠依据。

Under the four curing methods of same conditions,natural curing,standard curing,and manual curing,this article analyzes the strength and carbonation development law of C30 and C40 concrete respectively,in order to determine the concrete's physical strength and carbonation depth.The results show that:(1)under the same conditions,the compressive strength of the cured specimens is generally higher than the rebound strength by 5~10 MPa;(2)According to the growth of natural curing strength and carbonation development in different seasons,the growth of concrete strength during winter construction is slow,and it is necessary to improve the surplus strength in mix design;(3)By comparing the three methods of standard,natural,and manual maintenance,it can be seen that natural maintenance has low intensity and severe carbonization.It can be inferred from the growth patterns,characteristics,and interrelationships of concrete strength and carbonation under different curing systems that a reasonable curing method is a prerequisite for quickly and accurately judging concrete strength,and provides an important basis for reliability in concrete construction.