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This study investigated a new type of cementitious material(over-sulfur phosphogypsum(PG)–ground granulate blast-furnace slag(GGBFS)cement paste)by utilizing ground granulated blast-furnace slag,Portland cement clinker(PCC),additive,water and modificated phosphogypsum paste,produced by milling phosphogypsum mixed with a certain proportion of steel slag(SS),ground granulated blast-furnace slag and water.