水工混凝土的龄期问题

• 作 者: 戴镇潮
• 出 处: 混凝土与水泥制品
• 发表日期: 1982年06期
• 关键词: 水工混凝土 后期强度 五十年代 混凝土坝 年龄期 混凝土龄期 大坝混凝土 设计标准 混凝土抗渗性 抗冻性

水工混凝土(特别是大体积的混凝土坝)由于施工周期较长,因此如何利用混凝土后期强度继续增长的特性,是五十年代以来国内外水工混凝土工作者共同关心的课题。在美国和苏联从五十年代开始放弃了以28天强度做为设计标准的要求,采用了180天,乃至一到二年龄期作为设计龄期而规定标号(特殊情况例外),在日本和西欧则采用91天或90天作为设计龄期。我国在五十年代初期,水工混凝土龄期均采用28天,五十年代中期以后则逐步设用

Hydraulic concrete (especially large-volume concrete dams) has a long construction period. Therefore, how to use the characteristics of the continuous increase in concrete strength at the later stage is a common concern for hydraulic concrete workers both at home and abroad since the 1950s. In the United States and the Soviet Union, since the 1950s, the 28-day intensity design criteria were abandoned, and 180 days, or even one to two ages, were designated as the design age (special exceptions) in Japan and Western Europe. Then use 91 days or 90 days as the design age. In China in the early 1950s, the duration of hydraulic concrete was used for 28 days. After the middle period of the fifties, it was gradually used.