膨胀剂对高延性水泥基复合材料力学及变形性能的影响

发布时间：2018-03-26 11:29

本文选题：膨胀剂　切入点：高延性水泥基复合材料　出处：《硅酸盐学报》2016年11期

【摘要】：为了考察膨胀剂对高延性水泥基复合材料(HDCC)力学性能和变形的影响,研究了掺膨胀剂HDCC的抗折和抗压强度、弯曲韧性、单轴拉伸性能和干燥收缩变形,并采用环境扫描电镜观察了膨胀剂在HDCC中的水化产物形貌。结果表明:膨胀剂对HDCC的抗折强度基本无影响,但略微降低了抗压强度,增大了HDCC的弯曲强度和极限拉伸强度,降低了HDCC的韧性和延性;抗压强度降低幅度在15%以内,极限拉伸应变降低幅度在1/4以内,韧性降低幅度为28%~45%。掺膨胀剂后,HDCC在前2 d有一定的膨胀变形,而长龄期收缩变形值降低了1/4~1/2。膨胀剂水化产生的钙矾石提高了HDCC的体积稳定性。
[Abstract]:In order to investigate the effect of expansion agent on mechanical properties and deformation of high ductile cement matrix composites (HDCCs), the flexural and compressive strength, flexural toughness, uniaxial tensile properties and dry shrinkage deformation of HDCC were studied. The morphology of hydration products of the expansive agent in HDCC was observed by environmental scanning electron microscope. The results showed that the expansion agent had no effect on the flexural strength of HDCC, but slightly reduced the compressive strength, and increased the bending strength and ultimate tensile strength of HDCC. The toughness and ductility of HDCC are reduced by less than 15% in compressive strength, within 1 / 4 in ultimate tensile strain, and 28 / 45 in toughness. The shrinkage and deformation value of HDCC decreased by 1 / 4 / 1 / 2. Ettringite produced by hydration of expansion agent improved the volume stability of HDCC.
【作者单位】：东南大学材料科学与工程学院;江苏省土木工程材料重点实验室;南京水利科学研究院水文水资源与水利工程科学国家重点实验室;
【基金】：国家自然科学基金项目(51378113,51438003) 江苏省自然科学基金项目(BK20151072) 江苏省六大人才高峰B类高层次人才选拔培养项目(JZ-004) 国家重点研发计划课题(2016YF0401610)
【分类号】：TU528

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