Preparation of Calcined-Free Artificial Aggregate from Phosphogypsum and Its Performance
Artificial aggregates were prepared from phosphogypsum as raw material by using alkali excitation technology.The effects of different ratios on the properties of artificial aggregates were studied.The results show that when the water addition is 10%and sodium silicate addition(calculated as Na2O content)is 3%,molding pressure is 63 MPa,curing time is 28 days,and cement content is 30%,the compressive strength of the artificial aggregate reaches 25.16 MPa,water absorption rate reaches 15.21%,and bulk density reaches 1 156.4 kg/m3.The hydration products such as ettringite in the aggregate enhance the strength of artificial aggregates.
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