Optimal design and preparationof phosphogypsum-slag-based composite cementitious materials based on response surface methodology
In order to promote the resource utilization of phosphogypsum and other solid wastes,it optimized the design and preparation of cementable materials meeting the requirements of P·O 42.5 cement specification.Taking 3 d,7 d and 28 d compressive strength as response values,the change law of mechanical properties of phosphogypsum slag based composite cementing materials was explored,and the prediction model of mechanical properties of phosphogypsum slag based composite cementing materials was established.The results showed that the optimal mix ratio was:phosphogypsum 33.86%,slag 39.13%,lime 2.28%,lithium slag 20.1%,steel slag 4.65%,the 3 d,7 d and 28 d compressive strength of cementing materials reached 18.8 MPa,32.3 MPa,50.3 MPa,respectively,meeting the requirements of P·O 42.5 cement specification.The absolute value of the relative error between the measured value and the predicted value is less than 5%,indicating that it is feasible to optimize the design of phosphogypsum slag based composite cementing material based on response surface method.
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