玻璃纤维复合材料增强混凝土三点弯曲试验研究

Experimental study on three-point bending of glass fiber reinforced concrete

为了研究内嵌式玻璃纤维织物复合材料加固混凝土的抗弯性能以及破坏模式,对玻璃纤维混凝土展开三点弯曲试验研究,分析了玻璃纤维材料的网格尺寸、层数、短纤维含量对混凝土的影响规律。结果表明:随着纤维层数的增加,混凝土试件的抗弯韧性较素混凝土有明显上升,极限载荷比值最大达到352%;随着纤维网格尺寸的变大,混凝土试件抗弯韧性逐渐下降直至趋近于素混凝土;当混凝土试件中掺入混凝土体积2%的短纤维后,试件的抗弯性能较素混凝土提升了200%,纤维增强混凝土试件表现出良好的抗弯性能;混凝土掺入玻璃纤维后破坏模式从脆性破坏转变成塑性破坏。

In order to study the flexural performance and failure mode of concrete strengthened with embedded glass fiber fabric composites,three-point bending tests were carried out on glass fiber concrete,and the influence of grid size,number of layers and short fiber content of glass fiber materials on concrete was analyzed.The results show that with the increase of fiber layers,the flexural toughness of concrete specimens is significantly higher than that of plain concrete,with the maximum of 352%;With the increase of the fiber mesh size,the flexural toughness of concrete specimens decreases gradually until it approaches to plain concrete;When the concrete specimen is mixed with 2%short fiber of concrete volume,the flexural performance of the specimen is 200%higher than that of plain concrete,and the fiber reinforced concrete specimen shows good flexural performance;The failure mode of concrete changed from brittle failure to plastic failure after adding glass fiber.