摘要
为探究聚甲醛(POM)纤维对超高性能混凝土力学性能的影响,将POM纤维掺入混凝土。以POM纤维长度(6、12 mm)和体积掺量(0.6%、0.9%、1.2%、1.5%)作为变量,分别养护3、7、28 d后测试纤维混凝土的力学性能,探究POM纤维长度和掺量对混凝土抗折性能、抗压性能、韧性的影响。结果表明:随着POM纤维掺量的增加,纤维混凝土的抗折强度和抗压强度均呈现先增加后降低的趋势,12 mm的POM纤维比6 mm的POM纤维对强度的提升作用更明显。当POM纤维长度为12 mm,体积掺量为1.5%时,试件28 d抗折强度为21.2 MPa,相较于对照组提高了13.98%;当POM纤维长度为12 mm,体积掺量为0.9%时,试件28 d抗压强度为112.9 MPa,相较于对照组提高了7.83%;加入纤维后试件的等效弯曲韧性和等效弯曲强度增加,PF6-0.9和PF12-0.9的等效弯曲韧性较对照组分别提升了32.4%和127.6%,PF12-0.9的等效弯曲强度为对照组的3.1倍。
In order to explore the effect of polyoxymethylene(POM)fiber on the mechanical properties of ultra-high performance concrete(UHPC),POM fibers were added into concrete with different length(6 mm and 12 mm)and content(0.6%,0.9%,1.2%,1.5%),the mechanical properties of the fiber concrete were tested after curing 3,7 d and 28 d,respectively.The results show that the flexural strength and compressive strength of fibers concrete increase firstly and then decrease with the increase of POM fibers content,and the effect of 12 mm POM fibers is stronger than 6 mm POM fibers.When POM fiber length is 12 mm and volume content is 1.5%,the 28 d flexural strength of the specimens is 21.2 MPa,which is 13.98%higher than the control group.When POM fiber is 12 mm and olume content is 0.9%,the compressive strength of the specimens is 112.9 MPa,which is 7.83%higher than the control group.The equivalent bending toughness and equivalent bending strength of PF6-0.9 and PF12-0.9 increased by 32.4%and 127.6%,respectively,compared with the control group.And the equivalent bending strength of PF12-0.9 is 3.1 times that of the control group.
作者
马明龙
杨合
白冰
谢贵全
MA Minglong;YANG He;BAI Bing;XIE Guiquan(Institute of Resource and Environment,School of Metallurgy,Northeastern University,Shenyang 110819,China;Zhubang Construction Technology Investment(Chongqing)Co.,Ltd.,Chongqing 402460,China)
出处
《混凝土》
CAS
北大核心
2022年第11期101-105,共5页
Concrete
关键词
聚甲醛纤维
超高性能混凝土
力学性能
polyoxymethylene fiber
ultra-high-performance concrete
mechanical properties
