超高韧性水泥基复合材料受压性能试验研究  

Experimental research on compressive performance of ultra high toughness cementitious composites

作　　者：胡春红[1] 高艳娥[1] 丁万聪 

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]河南天兴工程建设监理有限公司,河南洛阳471004

出　　处：《建筑结构学报》2013年第12期128-132,154,共6页Journal of Building Structures

基　　金：国家自然科学青年基金项目(51208183);河南省教育厅自然科学研究计划项目(2011A560003);河南理工大学创新基金项目(2011-M-46)

摘　　要：通过对同批次2组圆柱体试件(每组3个)、2组立方体试件(每组3个)进行单轴受压试验,研究龄期、试件类型和纤维类型等因素对超高韧性水泥基复合材料(UHTCC)受压性能的影响,得到UHTCC的轴压应力-应变全曲线及不同类型试件的受压性能规律。结果表明:28 d龄期的圆柱体试件受压时,峰值应变约为0.015,明显高于普通混凝土峰值应变(0.002);极限压应变为0.034,约为普通混凝土的10倍;7 d龄期试件的轴压应力-应变全曲线在应力达到峰值后表现出明显的缓慢下降过程,说明此时UHTCC具有良好的压缩韧性;随着龄期的增长,UHTCC抗压强度提高,但变形能力有所下降;掺入普通高强高模PVA纤维制作的试件抗压强度较高,但变形性能低于K-ⅡREC15型PVA纤维制作的试件;龄期相同时,立方体试件的抗压强度高于圆柱体试件,说明试件尺寸与形状对抗压强度影响较大。Experimental research on compressive property of uhra high toughness cementitious composites （UHTCC） at different ages with three cylinder and cube specimens in each group was carried out. The influences of different fiber type, ages and specimen shape on compressive performance of UHTCC were studied, and the axial compressive stressstrain full curves and performance rule of different specimens were obtained. The results show that the peak strain of cylinder specimen at 28 d age is 0. 015, which is higher than that of normal concrete （ it is 0. 002 ）. The ultimate strain is 0. 034, which is 10 times higher than concrete. And the axial compressive stress-strain full curves of UHTCC with 7 d age have a slowly decreasing process when the stress reaches the peak value, which shows that UHTCC has good compressive toughness then. Deformation performance of UHTCC reduces and compressive strength increases along with the growth of the age. The deformation performance of specimens with ordinary high-strength PVA fiber is lower than that of specimens with K-II REC15 PVA fiber, but the compressive strength of the former is higher than that of latter. The cube compressive strength of specimens is generally higher than that of cylinder specimens with the same age, which indicates that the compressive strength is influenced by the size and shape of specimens.

关 键 词：超高韧性水泥基复合材料 轴压试验 应力-应变曲线 强度 变形 

分 类 号：TU528.58[建筑科学—建筑技术科学] TU317.1