ALKALI-SILICA REACTION AND HIGH PERFORMANCE CONCRETE.
ALKALI-SILICA REACTION AND HIGH PERFORMANCE CONCRETE.
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碱硅反应和高性能混凝土。
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
C. Ferraris
中科院分区：
文献类型：
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作者：
C. Ferraris
混凝土中碱硅反应 (ASR) 造成的损坏是自 1940 年以来在美国首次认识到的一种现象，此后许多国家都观察到了这一现象。尽管发表了大量研究，但其机制尚不清楚。然而，混凝土中的三个主要因素已被确定，即孔隙溶液中所含的碱、某些骨料中存在的反应性无定形或结晶不良的二氧化硅以及水。在本研究中，我们试图解决以下问题：高性能混凝土 (HPC) 是否容易受到 ASR 的影响？研究人员尚未就这一问题达成一致，因为除了三个主要因素（孔隙溶液碱度、骨料形态和水的存在）之外，其他因素对ASR的发生也起着重要作用，这些因素包括骨料级配、水灰比和抗压强度。研究发现，空气含量是增加 ASR 影响的混凝土膨胀的最重要变量（除了上述三个主要因素之外）。这项研究表明，如果使用反应性聚合物，即使是 HPC 也应该容易受到 ASR 的影响。
Damage due to alkali-silica reaction (ASR) in concrete is a phenomenon that was first recognized in the U. S. since 1940 and has since been observed in many countries. Despite numerous studies published, the mechanism is not yet clearly understood. Nevertheless, the three major factors in concrete have been identified, i.e., the alkalies contained in the pore solution, reactive amorphous or poorly crystallized silica present in certain aggregates, and water. In this study, we attempted to address the question: is high-performance concrete (HPC) susceptible to ASR? Researchers have not reached an agreement on this matter because factors other than the three major ones (pore solution alkalinity, aggregate morphology and water presence) play a significant role in the occurrence of ASR, these factors include aggregate gradation, w/c and compressive strength. It was found that air content is the most important variable (other than the three majors factors cited above) that increase expansion of concretes tiected by ASR. This study indicates that even HPC should be susceptible to ASR if reactive aggregates are used.