Study on the effect of recycled slurry in mixing plant on concrete properties
LIU Pinhong
LIAO Guosheng
HU Sida
LIAO Yishun
MEI Junpeng
SHU Dehui
Abstract：The effect of the placement time of the recycled slurry with a concentration of 6.4％in the mixing plant on the concrete properties was investigated.XRD and SEM were used to analyze the change process of hydration products and microscopic morphology of the recycled slurry in the net cement slurry at different placement times.The study shows that the recycled slurry replacing the mixing water will significantly reduce the fluidity of C30 concrete mixes,and the initial slump and expansion of the mixes gradually decrease with the longer placement time of the slurry,and the time loss increases significantly;when the slurry is placed within 24 h,the compressive strength of concrete at each age gradually increases with the extension of placement time,and the compressive strength tends to stabilize after 24 h.The XRD and SEM results show that the recycled slurry at 72 h has a significant effect on the concrete properties.The results showed that the recovered slurry was dynamically active within 72 h.The Ca(OH)2 diffraction peak increased gradually with the extension of slurry placement time within 24 h,indicating that the enhanced activity of slurry led to the gradual acceleration of hydration rate,the reduction of cement slurry pores and the continuous improve-ment of microstructure.
Keywords：concreterecycled slurryplacement timeactivityhydration products
Publication Date：2023-11-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 70-74 )