Evaluation of shear moduli of premature age of ultra-fine particle cement modified sand with various water-cement ratio

Abstract

Damage caused by liquefaction has been confirmed in various parts of Japan due to the recent large earthquake. The permeable grouting method is mentioned as the effective liquefaction countermeasure technical method in a limited space. Chemical grouting materials and cement-based solidifying materials are often used in the permeable grouting method. Although permeable grouting used chemical grouting material has high permeability, the long-term durability is not sufficiently secured and there are many constructor would not introduce it. On the other hand, with in regard to cement-based solidifying materials, although sufficient long-term strength is exerted, permeability is low, and injection into sand having fine particles is insufficient. In recent years, ultra-fine particle cement has been developed to solve these problems of cement-based solidifying materials .Ultra-fine particle cement is a material in which cement particles are very finely divided. The c cement-based solidifying materials using ultra-fine particle cement has been confirmed to have the same permeability as chemical grouting materials. The authors used the ultra-fine particle cement to change the water-cement ratio and investigate the dynamic deformation coefficient using a bender element test device. From the results, the influence of water-cement ratio on the improved sand was investigated.

Prediction of concrete strength using response surface function modified depth neural network

“…Nakata et al [2] further pointed out that concrete strength was mainly affected by W/C and compactness. In literatures [3][4][5], among the factors influencing CCS, W/C and the volume content of coarse aggregate (CA) were the most important. In addition, Guo et al [6] reported that CCS not only showed a linear decreasing connection with W/ C, but also a nonlinear connection with CA properties.…”