Research on concrete performance of multivarient solid waste system based on sludge
To alleviate the environmental degradation and the waste of resources caused by cement production and the treatment of solid waste such as sludge,four types of solid waste,namely silica fume,fly ash,slag,and glass powder,are taken as the research objectives,which can be combined with sludge to form the binary and ternary cementitious material substitution system.By changing the types and proportions of solid waste in the system to replace 20％of cement,twelve mix proportions were designed.To explore the mechanical properties of the binary and ternary cementitious material substitution systems,macroscopic analyses on compressive strength,apparent density,and water absorption rate were carried out,and microscopic structure analyses were performed using nuclear magnetic resonance microscopy,scanning electron microscopy(SEM),and X-ray diffraction(XRD).The experimental results show that the mechanical properties of the ternary cementitious material substitution system are significantly better than those of the binary system.The sludge-silica fume-fly ash substitution system has the best substitution effect,with a compressive strength of 4.2％and 12.5％higher than contrast groups Al and A2,respectively,because the mixture of silica fume and fly ash has better stimulating effect on sludge and enable it to participate in hydration reactions,so that more hydration products such as calcium aluminate(AFt)and C-S-H gel can be generated and the microstructure &pore structure are produced.Hence,this study can be referred to by the resource utilization of sludge and other solid wastes.
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