Effect of phospho gypsum on properties of Portland cement PC40
The present study assessed the effects of type and content of gypsum of Dinh Vu DAP factory on physico-mechanical properties of Portland cement PC40. The results of cements using phosphogypsum were compared to those of cement containing natural gypsum. The results showed that the lower standard consistency decreased, setting times and compressive strength on the third day increased when the quantity of gypsum in the cement was increased. Impurities such as soluble P2O5 and F- in phosphogypsum make cement sample have lower standard consistency, early age compressive strength and longer setting times. It is possible to replace natural gypsum by the refined phosphogypsum to produce Portland cement PC40.
Received: January 9th, 2018; revised: February 6th, 2018; accepted: February 28th, 2018