Mix Design Method for High-Compactable Concrete

在本研究中，在假定混凝土中的粗集料与表面粘结的砂浆一起运动的情况下，讨论了高密实混凝土的配合比设计方法。试验和讨论的结论如下：1.根据粗集料的大小和高效减水引气剂的掺量来估算砂浆粘结厚度。2.根据砂浆粘结厚度和用高效减水引气剂的掺量换算的含水率，可以用超量砂浆厚度理论来估算高密实混凝土的流动性。作为混凝土的流动度，砂浆的流动度和离析程度可以通过水泥、粉煤灰、细骨料等颗粒表面覆盖水的厚度来衡量。研究发现，在砂浆中掺入粉煤灰对改善砂浆流动性、减少离析是非常有效的。

In this study, mix design method for High-Compactable Concrete was discussed on the assumption that the coarse aggregates in concrete move with stuck mortar on their surface. The conclusions of the experiments and the discussions were summarized as follows.1.The thickness of stuck mortar was estimated by the size of coarse aggregate and the amount of high-range water-reducing and air-entraining admixture.2.Concerning the thickness of stuck mortar and water content that is converted by the amount of high-range water-reducing and air-entraining admixture, the fluidity of High-Compactable Concrete could be estimated by the theory of Thickness of Excess Mortar.3. As the fluidity of concrete, the fluidity and the segregation of mortar could be estimated by the thickness of water covering the surface of particles such as cement, fly ash and fine aggregate. And, it was found that adding coal ash into mortar was very effective to improve fluidity and to reduce segregation.