黄土-矿渣基新型胶结充填材料强度特性试验研究OA北大核心CSTPCD

In order to investigate the mechanical properties,damage mode and energy evolution of loess-slag-based cementitious filling materials under different water-cement ratios and curing ages,slump tests and uniaxial compression tests were conducted on loess-slag-based cementitious filling materials under four sets of water-cement ratios and five ages,respectively.It was found that the slump and expansion of the filling material increased with the increase of water-cement ratio.The peak strength of the material was negatively linearly correlated with the water-cement ratio and exponentially nonlinearly correlated with the age of curing.The dam-age mode of the filling material was generally shear damage,and the smaller the water-cement ratio and the longer the age of curing,the greater the damage of the filling material.The damage process of cemented material can be divided into five stages:compression density,elasticity,stable crack expansion,continuous crack expansion and post-peak damage.