1. Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China; 2. Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming 650500, China; 3. The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming 650500, China
Abstract: In order to promote the utilization of phosphogypsum,phosphogypsum composite cementing material (PGSM) is prepared through complex formulation method using phosphogypsum,anhydrous gypsum,steel slag and P·Ⅱ 52.5 cement as raw materials,and its hydration and cementitious process is studied.Experimental results show that PSGW cementing material is prepared reasonably when the contents of phosphogypsum,anhydrous gypsum,steel slag and P·Ⅱ 52.5 cement is 35%,5%,10% and 50%,respectively.The flexural strength and compressive strength of the material in 3 d is 4.87 MPa and 35.26 MPa,respectively,and the flexural strength and compressive strength in 28 d is 6.92 MPa and 51.51 MPa,respectively,and its softening coefficient is 0.88,which meet the requirement of P·O 42.5 R grade.Through the characterization of PSGW cementing materials by XRD,FT-IR and SEM,the hydration products of the system include mainly clonite ettringite,plate hydrated calcium silicate,calcium hydroxide and recrystallized calcium sulfate dihydrate.
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