摘要
对中国JGJ55-2011《普通混凝土配合比设计规程》与美国ACI 211.1-1991 R2009《普通混凝土、重混凝土及大体积混凝土配比选择标准》进行了全面系统的比较研究并依据两国规范对同一条件下的四组分混凝土分别进行了配比计算。研究表明两国在混凝土配比设计的方法和结果上有相同之处,也有诸多不同。中美规范对最关键参数水灰比的确定在本质上是一致的,两者均以混凝土强度与灰水比成线性关系的水灰比定则为配比设计基础。两国规范确定用水量也都同样基于"固定用水量定则"。对于四组分混凝土,与美国规范相比,中国规范计算的水灰比偏大较多,同时中国规范计算的水泥用量偏小。中国JGJ55-2011规范中混凝土强度的富余量比美国规范小,也比JGJ55-2000小,值得工程界注意。这一分析结果与一些文献给出的按新规范计算六组分混凝土水灰比偏小而强度偏大的反例不同,这种情况与JGJ55-2011中矿物掺合料影响系数取值处理粗糙以及总体偏小有关。
This paper comprehensively and systematically researches and compares JGJ55-2011 〈 Specification for Mix Proportion Design of Ordinary Concrete 〉 with ACI 211.1-1991 R2009 〈 Standard Practice for Selecting Proportions for Normal, Heavyweight, and Mass Concrete 〉 and then separately designs the mix proportion of concrete under the same conditions according to these two standards. The studies show that these two standards have both similarities and differences in concrete mix proportion design methods as well as results. For example, the methods of determining the key parameter water- cementitious ratio are the same in essence, which are both based on the water-cementitious ratio formula that concrete strength and cementitious-water ratio follow a linear relation. Furthermore, they both determine the quantity of water with fixed water consumption principle. When it comes to 4-constituent- concrete, compared to ACI standard, the result of water-cementitious ratio according to China＇ s standard is much bigger while the cement consumption is smaller. In addition, it should be noted that the margin of concrete strength is smaller than those in ACI standard as well as the old China＇ s standard JGJ55- 2000. These results are different from some counterexamples put forward by some papers showing that the calculation of water-cementitious ratio for 6-constituent-concrete according to the latest while strength is bigger, which is related to the rough and relatively small selection of influence coefficient in the standard JGJ55-2011.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2016年第11期3499-3510,共12页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金项目(51478207)
广东省省部产学研结合项目(2012B091000149)
广东省省部产学研合作专项资金项目(2013B090600046)
广东省省级科技计划项目(2015B09091003)
关键词
建筑科学
混凝土
配合比设计方法
building science
concrete
mix proportion design method standard is smaller mineral admixture
