磷石膏基复合胶凝材料早期强度和体积稳定性研究  

Study on Early Strength and Volume Stability of Phosphogypsum-Based Cementing Composite

作　　者：杨银银[1] 华苏东[1] 姚晓[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《硅酸盐通报》2014年第4期791-795,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家中小型企业创新基金(12C26213202487);江苏高校优势学科建设工程资助项目

摘　　要：针对磷石膏基复合胶凝材料(PGF)早期强度低、易膨胀开裂等缺点,通过加入适量活化剂(Y-1)来改善早期强度和体积稳定性,并且通过pH值、X射线衍射分析、微观形貌和孔隙率等测试方法分析PGF硬化体的水化产物和孔结构。结果表明:当Y-1掺量为3%(质量分数)时,可有效提高PGF硬化体早期抗压强度和抑制过度膨胀,其中3 d和28 d湿抗压强度分别为7.5 MPa和37.9 MPa,线膨胀率较参比样(未掺Y-1)分别降低了69.6%和71.6%,总孔隙率降低了2.3%和18.0%,有效改善了PGF硬化体的力学性能和体积稳定性。In this paper, the activator （ Y-1 ） was added to modify the early strength and volume stability of phosphogypsum-based cementing composite （PGF）. The hydration products and pore structure of composites were characterized by pH value, X-ray diffraction, microstructure and porosity. Results showed that when the addition of activator was 3wt% , the early compressive strength of hardened PGF could be improved effectively and the excessive expansion could be inhibited. Besides, the wet compressive strength of PGF cured for 3 d and 28 d reached 7.5 MPa and 37.9 MPa respectively. Compared with those without activator, the linear expansion ratio of products were decreased by 69.6% and 71.6% and the total porosity decreased by 2.3% and 18.0% , indicating that the mechanical properties and volume stability of hardened PGF were well optimized.

关 键 词：磷石膏 复合胶凝材料 活化剂 早期强度 体积稳定性 

分 类 号：TQ177[化学工程—硅酸盐工业]