Study on solidification effect of engineering waste organic silt stabilized by composite curing agent combined carbide slag with plant ash
ZHONG Weijun
ZHENG Qiqi
ZHANG Jie
ZHU Jianfeng
YANG Hao
PAN Binjie
Abstract：The present research aims to develop a new kind of green composite curing agent,PZ-1,in which the industrial and agricultural waste such as calcium carbide slag and plant ash are adopted to be raw materials,based on the response surface methodology and unconfined compression strength test results.Then,the mechanism of PZ-1 reinforcement of organic sludge was re-vealed through SEM and XRD analysis.The test results show that with the increase of calcium carbide slag and plant ash con-tent,the unconfined compressive strength of solidified organic sludge shows a phenomenon of first increasing,then decreasing and continuously increasing,respectively,in which the effect of calcium carbide slag on carbide slag is more significant.The optimal ra-tio of carbide slag and plant ash in PZ-1 is 20∶14.Ca(OH)2 in calcium carbide slag will play the role of neutralizing the humic acid existing in the organic silt and further provide the alkaline environment for the stabilization of PZ-1.The main product of stabilized organic silt is C-S-H gel,calcite,dolomite,ettringite,in which C-S-H gel plays the role of producing the structure of stabilized organic silt and the left 3 minerals behave in filling the pore of silt and further enhancing the density of silt.
Keywords：engineering waste siltorganic mattercalcium carbide slagplant ashscanning electron microscopeX-ray diffraction
Publication Date：2023-12-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 43-47,54 )