纳米碳酸钙和聚乙烯醇纤维增强混凝土抗弯拉性能

为探究纳米CaCO_3和PVA(聚乙烯醇)纤维对混凝土的抗弯拉强度和抗弯拉弹性模量的影响,采用三分点加载试验方法测试混凝土的抗弯拉强度和抗弯拉弹性模量。研究结果表明:在纳米CaCO_3混凝土中掺入PVA纤维,可以显著提高混凝土抗弯拉强度,在试验PVA纤维掺量范围内,随着PVA纤维掺量的增加,混凝土的抗弯拉强度和抗弯拉弹性模量均呈现先增大后减小的趋势;当PVA纤维掺量为0.05%时,其抗弯拉强度和抗弯拉弹性模量均达到最大值;在混凝土中掺加适量的纳米CaCO_3(3%),随着纳米CaCO_3掺量的增加,混凝土的抗弯拉强度和抗弯拉弹性模量逐渐增加,当纳米CaCO_3掺量超过3%时,随着纳米CaCO_3掺量的增加,其抗弯拉强度和抗弯拉弹性模量逐渐减小。

Flexural Properties of Nano-CaCO3 and PVA Fiber Reinforced Concrete

Using three-point loading test method, the flexural strength and flexural elastic modulus of concrete were tested, and the influence of nano-CaCO3 and PVA fibers on the flexural strength and flexural elastic modulus of concrete was explored. The research results show that adding PVA fiber to nano-CaCO3 concrete can significantly improve the flexural strength of concrete. Within the range of PVA fiber content tested in this study, with the increase of PVA fiber content, the flexural strength and flexural elastic modulus of concrete both increase first and then decrease. When PVA fiber content is 0.05%, the flexural strength and flexural elastic modulus reach the maximum value. When an appropriate amount of nano-CaCO3 (<3%) is added into concrete, with the increase of nano-CaCO3 content, the flexural strength and flexural elastic modulus of concrete gradually increase. When the nano-CaCO3 content exceeds 3%, with the increase of nano-CaCO3 content, the flexural strength and flexural elastic modulus gradually decrease.