Mechanism Study on Mortar Based on Phosphorus Slag Powder Modificated Phosphogypsum
In this paper,phosphogypsum was used as the main raw material and the effects of chemical reagents on the working performance,mechanical properties and micro-properties of gypsum mortar were studied.The results showed that the dosage of FDN increased from 0 to 1.5‰,the standard consistency of gypsum mortar decreased from 75%to 54%,the water reduction rate reached 28%,the strength of gypsum mortar increased 10%at the dosage of 0.3‰.The dosage of SG-12 increased decreased from 0 to 0.3%,the initial setting time was greater than 100 min,when the dosage reached 0.2%,the initial setting time reached more than 40 min,which could meet the requirements of mortar construction.When the content of modified phosphorus slag powder increased from 0 to 15%,the 24 h strength of gypsum mortar showed a trend of first increasing and then decreasing.When the dosage reached 10.0%,the flexural strength of phosphogypsum based mortar products reached 6.2 MPa,which was 138%higher than the blank,and the compressive strength reached 16.3 MPa,which was 90%higher than the blank.Through SEM analysis,it was found that the phosphorus slag modified materials was added,the crystal morphology of phosphogypsum based mortar after hydration changed from the original strip or sheet shape to the existing short column and hollow tube structures.The mechanical properties of this structure were better than those of the non added phosphorus slag modified materials,which is conducive to the comprehensive utilization of phosphogypsum.
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