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一、问题的提出 1.《普通混凝土配合比设计技术规定》(JGJ55-81)规定,在无法取得水泥实际强度数值时,按Rc=kcR_c~b计算,kc=1.13,如有历史统计资料,则可根据统计处理后的kc计算,因为水泥生产单位的不同,标准偏差相差较大,故如何取kc值确有进一步研究的必要。 2.《钢筋混凝土工程施工及验收规范》(GBJ204-83)第4·2·2条规定,混凝土的试验强度按R_(32)=R_标+σ_0计算。在无历史统计资料时,可按R_标=
1. Proposal of the problem 1. According to the “Technical Regulations for Design of Proportional Design of Normal Concrete” (JGJ55-81), when the actual strength value of cement cannot be obtained, it is calculated according to Rc=kcR_c~b, kc=1.13. If there is historical statistics, It can be calculated according to the statistical processing kc, because the different cement production units, the standard deviation difference is larger, so how to take the kc value does have the need for further research. 2. Article 4.2 and 2 of the “Code for Construction and Acceptance of Reinforced Concrete Engineering” (GBJ204-83) provides that the test strength of concrete shall be calculated as R32, R+, and σ_0. In the absence of historical statistics, press R_mark =