摘要
为了验证将短切碳纤维掺入水泥土的可行性,明确纤维掺量和纤维长度对水泥土的无侧限抗压强度和劈裂抗拉强度的影响规律,制备了水泥土试块,并对水泥土试块进行了无侧限抗压强度试验和劈裂抗拉强度试验。通过试验证明了在水泥土中掺入短切碳纤维的可行性。所得试验结果表明:在水泥土中掺入短切碳纤维能提高其无侧限抗压强度和劈裂抗拉强度,并且随着纤维掺量和纤维长度的增加均呈现先增大后减小的趋势。碳纤维的加入对水泥土试块的早期无侧限抗压强度和早期劈裂抗拉强度提高效果更佳,对其劈裂抗拉强度的提升效果要优于对无侧限抗拉强度的提升效果。在水泥土中掺入短切碳纤维能提高其峰值强度、残余强度、韧性和延性,并且在提高残余强度、韧性和延性方面更加显著,能使水泥土的破坏由脆性破坏变为延性或塑性破坏,增大了其形变范围。在试验所约定的配合比等条件下,可得28d龄期水泥土的最佳纤维掺量为4‰,最佳纤维长度为12mm。
In order to verify the feasibility of adding short carbon fibers into soil⁃cement,and clarify the influence of fiber content and fiber length on the unconfined compressive strength and splitting tensile strength of soil⁃cement,the soil⁃cement test blocks are prepared,and the unconfined compressive strength test and splitting tensile strength test are carried out.The feasibility of mixing short carbon fibers into soil⁃cement is proved by the tests.The test results show that the unconfined compressive strength and splitting tensile strength of soil⁃cement can be improved by adding proper amount and proper length of short carbon fibers into the soil⁃cement,and with the increase of fiber content and fiber length,both the two strengths increase first and then decrease.The improvement effect of carbon fibers on the early unconfined compressive strength and the early splitting tensile strength of soil⁃cement test blocks is better than that of the late strength.The improvement effect of carbon fibers on the splitting tensile strength of soil⁃cement test blocks is better than that of the unconfined tensile strength.The test results also show that the peak strength,residual strength,toughness and ductility of soil⁃cement can be improved by adding proper amount and proper length of short carbon fibers into soil⁃cement.The improvement of the residual strength,toughness and ductility is more significant than that of the peak strength.The failure of soil⁃cement can be changed from brittle failure to ductile failure or plastic failure,and the deformation range is enlarged too.The results show that the optimum fiber content of soil⁃cement is 4‰and the optimum fiber length is 12mm in the agreed test conditions at 28d.
作者
王林
周浩
孙阳
曹伟
Wang Lin;Zhou Hao;Sun Yang;Cao Wei(College of Mechanics and Materials,Hohai University,Nanjing 211100,China;School of Civil Engineering,Jiangsu College of Engineering and Technology,Nantong 226007,China;CCDI(SuZhou)Exploration&Design Consultant Co.Ltd,Suzhou 215000,China;College of Harbour,Coastal and Offshore Engineering,Hohai University,Nanjing 210098,China)
出处
《建筑科学》
CSCD
北大核心
2023年第7期118-126,共9页
Building Science
基金
江苏工程职业技术学院自然科学基金项目(GYKY/2020/7)
江苏省研究生科研与实践创新计划项目(KYCX23_0667)
南通市科技计划项目(JC22022082)。
关键词
短切碳纤维
水泥土
无侧限抗压强度
劈裂抗拉强度
变异系数
short carbon fiber
soil⁃cement
unconfined compressive strength
splitting tensile strength
coefficient of variation
作者简介
王林(1986⁃)男,在读博士研究生,讲师,[联系方式]wanglinhs@126.com。
