论文部分内容阅读
六十年代中期是美国轻骨料混凝土应用的高峰时期,据统计,当时的预应力混凝土预制构件几乎全部采用结构级的人造轻骨料混凝土。针对这一情况,美国国家标准局制订了一个全面的轻骨料混凝土和普通混凝土长期性能的研究计划,这里编译的资料即选自该研究成果中长期体积变形的一部分。这些研究成果有不少被美国有关规范所采纳。
The mid-1960s was the peak period for the application of lightweight aggregate concrete in the United States. According to statistics, prestressed concrete precast elements at that time used almost all of the structural-grade artificial lightweight aggregate concrete. In response to this situation, the US National Bureau of Standards has developed a comprehensive research program for the long-term performance of lightweight aggregate concrete and ordinary concrete. The compiled data is selected from the long-term volumetric deformation of the research results. Many of these research results have been adopted by relevant regulations in the United States.