层布式混杂纤维混凝土的干缩性能  

Study on dry-shrinkage properties of layer hybrid fiber reinforced concrete

作　　者：贺东青[1] 卢哲安[2] 

机构地区：[1]河南大学土木建筑学院,河南开封475001 [2]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《中国农业大学学报》2007年第3期96-99,共4页Journal of China Agricultural University

基　　金：国家<纤维混凝土结构技术规程>资助项目(建标协字第15号)

摘　　要：为研究层布式钢纤维与聚丙烯纤维混杂应用对混凝土干缩性能的影响,对普通混凝土、层布式钢纤维混凝土以及层布式混杂纤维混凝土在恒温((20±2)℃)、恒湿(相对湿度(60±5)%)条件下的干缩率和质量损失率进行了对比试验。结果表明:层布式混杂纤维混凝土的干缩率明显小于普通混凝土和层布式钢纤维混凝土,在龄期180 d时,层布式混杂纤维混凝土干缩率降低了26.9%,掺入粉煤灰和磨细矿渣的层布式混杂纤维混凝土降低了40.2%;而层布式混杂纤维混凝土的质量损失率比普通混凝土大,在龄期180 d时,增加了18.3%,掺入粉煤灰和磨细矿渣的层布式混杂纤维混凝土,其质量损失率与普通混凝土基本一致。层布式混杂纤维的掺入,显著改善了混凝土的干缩性能。In order to study the effects of the hybrid application of layer steel fibers and polypropylene fibers on dryshrinkage properties of concrete, the contrast experiments on the dry-shrinkage ratio and mass-loss ratio of the ordinary concrete （OC）, the layer steel fiber reinforced concrete （LSFRC） and the layer hybrid fiber reinforced concrete （LH- FRC） under constant temperature （（20 ± 2） ℃ ） and constant humidity（relative humidity 60% ± 5% ）conditions were carried out, The dry-shrinkage ratio of LHFRC is obviously smaller than those of OC and LSFRC and achieves a reduction of 26.9% ; while that of LHFRC after adding grinding slag and fly ash achieves a reduction of 40.2% at the age of 180 days. However, the mass-loss of LHFRC is larger than that of OC and achieves an increment of 18.3% at the age of 180 days and that of LHFRC is almost the same with OC＇ s after adding grinding slag and fly ash. The dry-shrinkage properties of concrete will be improved remarkably by adding layer hybrid fiber.

关 键 词：干缩性能 层布式混杂纤维混凝土 干缩率 质量损失率 

分 类 号：TU528.572[建筑科学—建筑技术科学]