塑钢纤维混凝土早龄期力学性能研究  

Research on mechanical properties of plastic steel fiber concrete at early age

作　　者：段小芳 袁娇娇 DUAN Xiaofang;YUAN Jiaojiao(School of Construction Engineering,Nantong Open University,Nantong,Jiangsu 226006,China;School of Civil Engineering and Transportation,Hohai University,Nanjing,Jiangsu 210098,China)

机构地区：[1]南通开放大学建筑工程学院,江苏南通226006 [2]河海大学土木与交通学院,南京210098

出　　处：《湖南城市学院学报（自然科学版）》2022年第6期14-18,共5页Journal of Hunan City University:Natural Science

基　　金：住建部科研开发项目(2018-K5-009);江苏省住建厅科学技术指导项目(2018ZD190);南通市科技计划指导项目(MSZ19224)。

摘　　要：为了研究塑钢纤维对混凝土早龄期力学性能的影响,将体积率为0%、0.45%、0.90%和1.35%的塑钢纤维掺入混凝土中,以探寻早龄期立方体抗压强度、劈裂抗拉强度和抗折强度的发展变化规律.结果表明:塑钢纤维对混凝土早龄期劈裂抗拉强度的增幅最大,抗折强度次之,对立方体抗压强度影响最小,且随着龄期发展,早龄期劈裂抗拉强度发展最快,抗折强度次之,立方体抗压强度发展最慢;掺入适量塑钢纤维可以提高混凝土早龄期拉压比和折压比,改善混凝土脆性,且0~28d塑钢纤维混凝土早龄期拉压比和折压比随着龄期增大而降低,最终趋于平稳.In order to study the influence of plastic steel fiber on the mechanical properties of concrete at early age, 0%, 0.45%, 0.90% and 1.35% volume fraction of plastic steel fiber were added into concrete to study the development and variation of cube compressive strength, splitting tensile strength and flexural strength at early age. The results show that the increase of the splitting tensile strength of the early age concrete is the largest, the flexural strength is the second, and the cube compressive strength is the smallest.With the development of age, the development of splitting tensile strength in early age is the fastest, followed by flexural strength, and cube compressive strength develops slowest;It is found that appropriate amount of plastic steel fiber can increase the tension compression ratio and flexural compression ratio of concrete at early age, improve the brittleness of concrete, and the tensile compression ratio and flexural compression ratio of 0 ~ 28d plastic steel fiber reinforced concrete at early age decrease with the increase of age, and finally tend to be stable.

关 键 词：塑钢纤维 早龄期 抗压强度 抗拉强度 抗折强度 

分 类 号：TU528.572[建筑科学—建筑技术科学]