山东大学学报 (工学版) ›› 2025, Vol. 55 ›› Issue (2): 106-113.doi: 10.6040/j.issn.1672-3961.0.2024.022
• 土木工程 • 上一篇
银英姿,魏景涛*,泽里罗布,董伟
YIN Yingzi, WEI Jingtao*, ZELI Luobu, DONG Wei
摘要： 为探究玄武岩纤维(basalt fiber, BF)对风积沙混凝土(aeolian sand concrete, ASC)耐久性及使用寿命的影响,本试验采用风积沙等质量取代河砂,取代后风积沙质量占混凝土中河砂质量的20%,ASC中BF的体积分数选取0、0.05%、0.10%、0.15%、0.20%,制备玄武岩纤维风积沙混凝土(BF-ASC)。在冻融条件下,研究不同BF体积分数对ASC质量、相对动弹性模量的影响,并通过扫描电镜(scanning electron microscopy, SEM)分析BF-ASC的损伤劣化机理。以BF-ASC试块相对动弹性模量作为退化指标,选用一元Wiener函数进行退化过程建模,预测BF-ASC寿命。结果表明:BF的掺入能够降低ASC的孔隙率,增强粗细骨料之间的黏结力,明显提高混凝土的抗冻性能,降低混凝土冻融损伤程度,当BF体积分数为0.20%时,质量损失率最低,相对动弹性模量评价参数降幅最小,抗冻效果最佳;基于Wiener随机分布以BF-ASC相对动弹性模量作为退化指标所得到的BF-ASC可靠度函数,能够有效预测BF-ASC在盐冻环境下的使用寿命,且当ASC中BF体积分数为0.20%时,最长使用寿命约达2 500 h。
中图分类号:
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