不同湿度和温度条件下asr影响混凝土诱发力学劣化的评价

IF 10.8 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Cement & concrete composites Pub Date : 2025-01-15 DOI:10.1016/j.cemconcomp.2025.105942
O.D. Olajide , M.R. Nokken , L.F.M. Sanchez
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引用次数: 0

摘要

湿度和温度对混凝土中碱硅反应(ASR)的产生至关重要。然而,这些暴露条件对 ASR 引起的劣化(特别是机械性能损失)的影响还没有得到很好的研究。为了进一步了解情况,我们制造了使用斯普拉特活性粗集料并在碱中添加至 5.25kg/m³ 的混凝土圆柱体,并将其存放在三种不同温度(即 21°C、38°C 和 60°C)和多种相对湿度(即 100%、90%、82%、75% 和 62%)条件下。通过刚度破坏试验(SDT)、直接剪切试验和抗压强度试验评估了机械性能的降低情况。总体而言,除弹性模量和剪切强度外,大多数机械性能结果都显示出强烈的线性膨胀趋势。在同时经历干燥收缩和 ASR 的低湿度条件下,由于水泥浆中出现的早期龄期裂缝,与特定机械性能损失相关的膨胀水平与高湿度条件下的膨胀水平不同。在大多数已发表的研究中,膨胀是评估暴露条件作用的主要标准。但研究发现,由于耦合机制的存在,仅凭膨胀水平并不能可靠地反映诱导劣化。此外,这种现象的影响因所评估的不同机械性能而异。此外,考虑到对机械性能的影响,还对反应所需的湿度阈值进行了评估。
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Evaluation of the induced mechanical deterioration of ASR-affected concrete under varied moisture and temperature conditions
Moisture and temperature are critical for developing alkali-silica reaction (ASR) in concrete. However, the influence of these exposure conditions on ASR-induced deterioration, specifically mechanical property losses, has not been well studied. To further our understanding, concrete cylinders made with Spratt reactive coarse aggregates and boosted in alkalis to 5.25 kg/m³ Na2Oeq were manufactured and stored at three different temperatures (i.e., 21 °C, 38 °C, and 60 °C) under numerous relative humidities (i.e., 100 %, 90 %, 82 %, 75 %, and 62 %). The reduction in mechanical properties was assessed using the stiffness damage test (SDT), direct shear and compressive strength tests. Overall, most results for mechanical properties showed a strong linear trend with expansion, with the exception of the modulus of elasticity and shear strength. In low moisture conditions that experienced both drying shrinkage and ASR, the expansion level associated with a given mechanical property loss differs from that in high moisture conditions due to early age cracks that developed in the cement paste. In most published research, expansion is the primary criteria used in assessing role of exposure conditions. However, it was found that expansion levels alone are not reliable indicators of induced deterioration due to the coupled mechanism. Furthermore, the impact of this phenomenon varies with the different mechanical properties assessed. Additionally, the moisture threshold required for the reaction was evaluated by considering the impact on mechanical properties.
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来源期刊
Cement & concrete composites
Cement & concrete composites 工程技术-材料科学:复合
CiteScore
18.70
自引率
11.40%
发文量
459
审稿时长
65 days
期刊介绍: Cement & concrete composites focuses on advancements in cement-concrete composite technology and the production, use, and performance of cement-based construction materials. It covers a wide range of materials, including fiber-reinforced composites, polymer composites, ferrocement, and those incorporating special aggregates or waste materials. Major themes include microstructure, material properties, testing, durability, mechanics, modeling, design, fabrication, and practical applications. The journal welcomes papers on structural behavior, field studies, repair and maintenance, serviceability, and sustainability. It aims to enhance understanding, provide a platform for unconventional materials, promote low-cost energy-saving materials, and bridge the gap between materials science, engineering, and construction. Special issues on emerging topics are also published to encourage collaboration between materials scientists, engineers, designers, and fabricators.
期刊最新文献
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