Study on the properties of grout materials prepared by SAC-P·Ⅱ.system for the preparation of waste concrete recycled sand powder
The effects of SAC-P·Ⅱ.(Sulphoaluminate-Ⅱ Portland cement)composite system as cementitious material on the fluidity,flexural compressive strength,tensile bonding strength,water secretion rate and vertical expansion rate of cement-based grout materi-als prepared from waste concrete recycled sand powder as aggregate.The results showed that with the increase of SAC cement incorpo-ration ratio,the fluidity decreased significantly in 30 min,and the flexural and compressive strength of 1d and 3d increased greatly,while the flexural and compressive strength of 28 d increased little.P·Ⅱ.cement shrinkage is large,SAC cement has micro-expansion performance,so the higher the proportion of SAC cement,the vertical expansion rate increases under the same amount of expander,and vice versa.Under the same amount of cementitious material,the proportion of SAC cement was high,and the strength of tensile bonding original,water immersion and thermal aging were all reduced,which was consistent with the microstructure of scanning elec-tron microscopy(SEM).Considering the properties,it is recommended that the proportion of SAC cement in the grout of the sulfur SAC-P·Ⅱ.composite system should not exceed 80％.
concrete recycled sand powdercement-based groutstensile bond strengthvertical expansion ratefluidity
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