基于Wiener退化过程的纤维混凝土抗冻性

doi:10.6040/j.issn.1672-3961.0.2024.022

摘要/Abstract

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。

关键词: 风积沙混凝土, 玄武岩纤维, 耐久性, 寿命预测, 一元Wiener

Abstract: In order to explore the impact of basalt fiber(BF)on the durability and service life of aeolian sand concrete(ASC), this experiment used aeolian sand to replaced river sand, and the mass of aeolian sand accounts for 20% of the mass of river sand in the concrete after replacement, and the basalt fiber aeolian sand concrete(BF-ASC)was prepared under the conditions of 0, 0.05%, 0.10%, 0.15%, and 0.20% BF content. The effects of different BF content on concrete mass and relative dynamic elastic modulus were studied, and the damage and deterioration mechanisms of BF-ASC was analyzed by scanning electron microscopy(SEM). With the relative dynamic elastic modulus of BF-ASC test block as the degradation index, a single Wiener function was used to model the degradation process and predict the life of BF-ASC. The results showed that adding BF could reduce the porosity of ASC, enhance the bonding strength between coarse and fine aggregates, significantly improve the frost resistance of concrete, and reduce the freeze-thaw damage degree of concrete. When the volume fraction of BF was 0.20%, the mass loss rate was the lowest, the relative dynamic elastic modulus evaluation parameter had the smallest decrease, and the frost resistance effect was the best; The reliability function of BF-ASC obtained based on Wiener random distribution with BF-ASC relative dynamic elastic modulus as the degradation index could effectively predict the service life of BF-ASC in salt freezing environment, and the longest service life could reach about 2 500 hours when the BF volume fraction was 0.20%.

Key words: wind sand concrete, basalt fiber, durability, life prediction, unary Wiener

中图分类号:

TU528

银英姿,魏景涛,泽里罗布,董伟. 基于Wiener退化过程的纤维混凝土抗冻性[J]. 山东大学学报 (工学版), 2025, 55(2): 106-113.

YIN Yingzi, WEI Jingtao, ZELI Luobu, DONG Wei. Frost resistance of fiber reinforced concrete based on Wiener degradation process[J]. Journal of Shandong University(Engineering Science), 2025, 55(2): 106-113.

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