Mechanical properties and mechanism of industrial solid waste carbonized solidified sludge
To improve the mechanical properties of sludge and increase its resistance to deformation,a new type of environment-friendly solidified agent with carbide slag,fly ash and slag,combined with CO2 to carbonize and solidify sludge.Through the unconfined compression test,accelerated carbonation test,X-ray diffraction(XRD)and scanning electron microscopy(SEM),the effects of different solidification agent content,carbonation time,carbonation depth on the mechanical properties and microstructure of the samples were compared and ana-lyzed.The results show that:the compressive strength of carbonized 6 h samples was significantly increased by 16％～25％;the strength of the sample increases first and then decreases with the carbonation time,and the op-timum carbonation time is about 6 h;after carbonizing for 6 h,the pH value decreases from 11～14 to 10～12;the square root of carbonization depth and carbonization time of solidified silt can be approximately regarded as linear relationship;after carbonization,the sample is damaged,the strain is basically unchanged,but the peak stress increases obviously,and the deformation modulus of carbonized sample is higher than that of uncarbon-ized sample;the hydrated product produced by carbonizing solidified sludge samples of industrial solid waste is CaCO3 crystal,which exists in the form of acicular aragonite and square calcite,and jointly constructs the inter-nal skeleton of soil,forming a very dense cross system.
industrial solid wastecarbonation and solidificationsolidified sludgemechanical propertiesmi-croscopic mechanisms
万方数据
维普
