脱硫石膏晶须对水泥基材增强行为的研究

Enhancement Performance of Desulfuration Gypsum Whisker on Cementitious Materials

以合成脱硫石膏晶须为增强、增韧剂,以水泥砂浆为研究对象,检测了脱硫石膏晶须掺量(占水泥质量百分比为:0、0.5wt%、1wt%、2wt%、3wt%)对水泥砂浆试件不同龄期(3 d、7 d、28 d)抗压、抗折强度的影响;通过脱硫石膏晶须在碱性水泥基质中的分布和微观形貌的分析,进一步探讨了脱硫石膏晶须添加水泥基材的增强、增韧机理。结果表明:添加1wt%脱硫石膏晶须的水泥砂浆试件的抗折、抗压强度比未添加晶须试件的分别提高了28.41%、45.65%;脱硫石膏晶须在水泥砂浆试件中能保持原有形貌而稳定存在;脱硫石膏晶须在水泥基质中微缝处具有的架桥、连接作用阻碍了水泥基质中微裂纹的产生与扩展,从而提高了水泥砂浆试件的抗折、抗压强度。

Mortar samples were prepared by using different desulfuration gypsum whisker （0 ,0 . 5wt% , lwt% ,2wt% ,3wt% ） as toughening agent. The samples＂mechanical properties at different ages（3 d,7 d,28 d） , microstructure of gypsum whisker and it distribution in cement matrix were detected. It was found that the flexural strength and compression strength of sample added with lwt% desulfuration gypsum whisker were increased by 28. 41% and 45. 65% , respectively. The mechanisms of the reinforcement of desulfuration gypsum whisker on cement were also discussed, the mechanical improvement can be explained by the energy-dissipating processes owing to crack bridging, crack deflection, and whisker pull-out at the crack tips.