磷石膏基胶凝材料的早期性能研究  

Early performance of phosphogypsum-based cementing materials

作　　者：徐文[1] 华苏东[1] 姚晓[1] 万军[2] 王勇[2] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009 [2]贵州省建筑材料科学研究设计院,贵州贵阳550007

出　　处：《南京工业大学学报（自然科学版）》2016年第6期93-98,共6页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省高校自然科学基金(16KJB440001);高性能土木工程国家重点实验室开放基金(2015CEM011);江苏高校优势学科建设工程

摘　　要：研究硅酸钠分别与不同早强剂复掺对磷石膏基胶凝材料(PGF)性能的影响,并通过X线衍射仪(XRD)、扫描电子显微镜(SEM)测试产物微观结构。结果表明:掺入硅酸钠和早强剂明显提高了磷石膏基胶凝材料的抗压强度,当掺入0.5%二水氯化钙和3%硅酸钠时,7、28 d抗压强度分别较未掺外加剂时提高了46.53%和59.51%,线膨胀率分别较未掺外加剂硬化体降低50%,28 d软化系数提高28%,使得胶凝材料的性能得到很大提高。To investigated the multi-mixing influence of sodium silicate and different early strength agents on the performance of phosphogypsum-based cementing material （PGF）,the hydration products of the samples were characterized by means of X-ray diffraction （ XRD ） and scanning electron microscope （SEM）.Results showed that with the mixing of sodium silicate and early strength agents the compressive strength of the PGF could be obviously improved.When 0.5% calcium chloride dihydrate and 3% sodium silicate were used, the compressive strength of the product cured for 7 d and 28 d was increased by 46.53% and 59.51%, the linear expansion ratio of the product was decreased by 50%, the softening coefficient of the product cured for 28 d was decreased by 28%,and the performance of PGF were greatly improved.

关 键 词：磷石膏 胶凝材料 早期强度 软化系数 二水氯化钙 

分 类 号：TQ177.3[化学工程—硅酸盐工业]