Research on Phosphorus Slag Powder Used as Admixture in Hydraulic Concrete

摘要

Chemical composition, microstructure and morphology performance of phosphorus slag powder, as well as the effects of phosphorus slag powder and fly ash as admixtures on hydration heat and strength of cementitious materials, and mechanics, thermology, deformation and durability performances of hydraulic concrete were completely researched and analyzed. The results show that, phosphorus slag powder can reduce hydration heat of cementitious materials and adiabatic temperature rise of concrete obviously, which is benefical to the construction, temperature control and anti-crack of mass concrete; compared with concrete mixed with fly ash, concrete mixed with phosphorus slag powder has a equal strength in early age, higher strength grow rate in later age, and higher ultimate tension, dry shrinkage and autogenous volume deformation; phosphorus slag powder has no adverse effect on the performance of impermeability and frost resistance of concrete. Phosphorus slag powder can replace fly ash partially or completely for wide application in concrete, and bring out remarkable economic and environmental benefits.