摘要
采用正交试验法对18组混杂纤维混凝土和1组普通高性能混凝土进行了抗压强度和劈拉强度试验,考察的因素有钢纤维种类、钢纤维体积率、钢纤维长径比及聚丙烯体积率。通过正交试验的直观分析法比较了各因素对混杂纤维混凝土强度和韧性的影响。结果表明:钢纤维外形对混杂纤维混凝土强度的影响最大,钢纤维长径比的影响最小。钢纤维外形对拉压比影响最大,聚丙烯体积率对拉压比的影响次之,钢纤维长径比对拉压比的影响最小。加入适量的钢纤维和聚丙烯纤维可提高混杂纤维混凝土的强度和韧性。
In order to investigate the strength and toughness of hybrid fiber reinforced high performance concrete （HFRHPC）, the sphtting tensile strength and compressive strength of 18 different groups of specimens with steel fiber and polypropylene fiber and 1 group contradistinctive HPC specimen were tested according to the orthogonal experimental design. The contributory factors such as types of steel fiber geometry, length/diameter aspect ratio of steel fiber, steel fiber and polyprepylene fiber volume fraction were analyzed. Influence of all kinds of factors on the Strength and toughness of hybrid fiber reinforced high performance concrete was compared by directviewing analysis of the orthogonal experimental design. Results of orthogonal experiment illuminate that various parameters of fibers have different effect on the strength and toughness of HPC. Types of steel fiber geometry play the most important role in improving strength whereas length/diameter aspect ratio of steel fiber has minimum effect. Influence of types of steal fiber geometry on the ratio between splitting tensile strength and compressive strength of HFRHPC is the highest, pelypropylene fiber volume fraction is the second, and influence of length/diameter aspect ratio of steel fiber is the least. Thus adding a reasonable volume of hybrid fibers to high performance concrete can increase the strength and toughness.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第8期5-9,共5页
Journal of Wuhan University of Technology
基金
湖北省教育厅青年科学基金(B200514003)
关键词
混杂纤维
高性能混凝土
强度
韧性
正交试验
hybrid fiber
high performance concrete
strength
toughness
orthogonal experiment
