Investigation on the properties of supersulphated phosphogysum-slag cement (SSC) concrete
Supersulphated phosphogysum-slag cement (SSC) is a newly devel oped non-burned cementitious material mainly composed of phosphogysum (PG) and ground granulated blast furnace slag (GGBFS), with small amount of steel slag (SS) and clinker (CL).SSC is a kind of environmentally-friendly cementitious material due to its energy-saving, low-carbon emission, and waste utilization.In this paper, concretes are prepared with supersulphated phospho gysum-slag cement, while the mechanical properties, micro-properties and re sistance to chloride penetration of concrete are studied in comparison with those of portland slag cement (PSC) and ordinary portland cement (OPC) concrete.The test results show that the compressive strength of SSC concrete can reach 38.6 MPa at 28d, close to PSC concrete and OPC concrete.Microanalyses in dicate that large quantities of ettringite and C-S-H, and little amount of Ca (OH)2 are generated during the hydration of SSC.The dense cement paste structure of SSC is formed by ettringite and C-S-H, surrounded unreacted phosphogysum.The property of resistance to chloride penetration of SSC con crete is better than PSC and OPC concrete due to the fact that SSC can form much more ettringite to solidify more Cl-.
Supersulphated phosphogysum-slag cement Chloride penetration Ettringite
Sha Ding Zhonghe Shui Wei Chen Jianxin Lu Sufang Tian
State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China
国际会议
武汉
英文
246-255
2013-10-23（万方平台首次上网日期，不代表论文的发表时间）