Research on a method of estimating quality of concrete using mixed aggregate

1. 新拌混凝土的性能由不同的骨料掺量比和水灰比（轻骨料与普通骨料的混合）决定。澄清了以下几个方面。采用不同配比的轻骨料和普通骨料，获得了新拌混凝土的目标性能。研究了不同重量骨料与轻骨料混合比、水灰比的混凝土。澄清了以下几个方面。(1)抗压强度随正常粗骨料掺量的增加而增加，可按各水灰比下的单位体积重量估算。(2)静弹性模量随正常细骨料与正常粗骨料混合比的增大而增大，无论水灰比如何，均可按单位体积重估算，适用于水灰比小于等于40%时的Tomozawa和Noguchis模量估算方程。研究了普通砂与铁镍渣、铜渣混合成30%和70%掺量的细骨料混凝土对普通混凝土和轻质混凝土的出血、强度和干缩的影响。澄清了以下几个方面。在高强混凝土中，可采用掺合细骨料。在标准强度混凝土中，由于掺砂中矿渣的掺量应控制在30%左右，因此可以与普通混凝土一样使用。

1. The properties of fresh concrete were determined by varying aggregates mixing ratio and water-cement ratio (mixture of lightweight aggregate and normal-weight aggregate). The following aspects are clarified. The targeted properties for fresh conncrete were obtained by using light weight aggregate and normal-weight aggregate in various mixing ratios. We studied concrete containing varying mixing ratio of normal-weight aggregate and light weight aggregate, water-cement ratio. The following aspects are clarified. (1) The compressive strength increases as the mixing ratio of normal coarse aggregate increases, which can be estimated based on the unit volume weight as each water-cement ratio. (2) The static modulus of elasticity increases as the mixing ratio of normal fine aggregate and normal coarse aggregate increases, which can be estimated based on the unit volume weight regardless of water-cement ratio, which is applicable to Tomozawa and Noguchis' modulus estimation equation at water-cement ratio of 40% or less.2. Influence of concrete using the blended fine aggregate of mixing ratio of 30% and 70% which were mixed normal sand with fero-nickel slag and copper slag on bleeding, strength and drying shrinkage of normal and light weight concrete were determined. The following aspects are clarified. On high-strength concrete, the blended fine aggregate can be used. On normal strength concrete, as the ratio of slag in the blended sand should be limited less than about 30%, it can be used as well as normal concrete.