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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。
Two sets of cylindrical specimens (three in each group), two sets of cubic specimens (three in each group) were tested by uniaxial compression test, age of study, type of specimen and type of fiber. High tenacity cement-matrix composites (UHTCC) under the influence of compressive properties, obtained UHTCC axial compressive stress - strain curves and different types of specimen compression performance rules. The results show that the peak strain is about 0.015, which is obviously higher than the peak strain of ordinary concrete (0.002) when compressive stress is applied to the cylindrical specimens at 28 days. The ultimate compressive strain is 0.034, about 10 times that of ordinary concrete. The axial compressive stress-strain curve of the test specimen showed a significant slowdown after the peak stress, indicating that the UHTCC had good compressive toughness at this time. As the age increased, the compressive strength of the UHTCC increased, but the deformation capacity The compressive strength of the specimens made of common high-strength and high-modulus PVA fibers is higher than those of K-ⅡREC15-type PVA fibers. When the age is the same, the compressive strength Higher than the cylinder specimen, indicating that the specimen size and shape of compressive strength greater impact.