摘要
针对不同石膏对超硫酸盐水泥水化行为的影响,测试了分别掺有硬石膏、二水石膏和磷石膏的超硫酸盐水泥的各龄期抗压强度,对比了其早期放热速率及放热曲线的差异,以及水化产物相的变化.结果表明:上述3类超硫酸盐水泥3d抗压强度均为14MPa左右;磷石膏基超硫酸盐水泥28,90d抗压强度分别为41.2,49.1MPa,明显高于其他两种水泥.超硫酸盐水泥早期强度主要受水化速率的影响.后期强度测试结果表明,磷石膏的激发效果优于硬石膏及二水石膏,用其制备的水泥浆体后期形成更多的水化硅酸钙与钙矾石,硬化浆体更加密实.
In order to elucidate the hydration behavior of super sulphated cement（SSC） with different types of gypsum, influence of anhydrite, dihydrate gypsum, and phosphogypsum on the cement paste compres- sive strength of various age of SSC were tested~ furthermore, hydration exothermic rate, hydration heat and hydration products were systematically compared. Results show that 3-day strength of all samples is a- bout 14 MPa;however, phosphogypsum based SSC of the compressive strength 41.2 MPa at 28 days and 49.1 MPa at 90 days is significantly higher than other samples. Early strength mainly depends on hydra- tion heat rate of different samples, later strength is due to the better activation effect of phosphogypsum than anhydrite and dihydrate gypsum, SSC paste with phosphogypsum could generate more C-S-H and ettringite in late stage with relatively higher density than other samples.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2014年第6期965-971,共7页
Journal of Building Materials
关键词
石膏
超硫酸盐水泥
强度
水化热
水化产物
gypsum
super sulphated cement（SSC）
strength
hydration heat
hydration product
