Randomized trial examines mechanical properties and freeze-thaw resistance in concrete with high-volume calcined phosphogypsum, implying importance for construction materials.
Key Points
This research aims to evaluate how high volumes of calcined phosphogypsum affect the mechanical properties and frost resistance of concrete.
Utilized various high-volume calcined phosphogypsum contents (40% to 70%) in phosphogypsum slag cement concrete mixtures.
Assessed workability, compressive strength, water absorption, and freeze-thaw resistance through various tests.
Evaluated slump, flexural and compressive strength, and mass loss rate after freeze-thaw cycles.
The slump decreased from 275 mm to 35 mm as calcined phosphogypsum content increased from 40% to 70%.
Compressive strength ranged from 39.9 MPa to 56.4 MPa even at high calcined phosphogypsum contents.
All mixtures complied with the Chinese standard for mass loss after freeze-thaw cycles, with higher mass loss observed at increased calcined phosphogypsum levels.