学术论文

      磷石膏基胶凝材料的早期性能研究

      Early performance of phosphogypsum-based cementing materials

      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。
      Abstract:
      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.
      作者: 徐文 [1] 华苏东 [1] 姚晓 [1] 万军 [2] 王勇 [2]
      Author: XU Wen [1] HUA Sudong [1] YAO Xiao [1] WAN Jun [2] WANG Yong [2]
      作者单位: 南京工业大学 材料科学与工程学院,江苏 南京,210009 贵州省建筑材料科学研究设计院,贵州 贵阳,550007
      年,卷(期): 2016, 38(6)
      分类号: TQ177.3
      在线出版日期: 2016年12月23日
      基金项目: 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