نوع مقاله : علمی - پژوهشی
نویسندگان
1 دانشجوی دکتری عمران، دانشگاه بوعلی سینا، همدان، ایران
2 دانشیار گروه عمران، دانشگاه بوعلی سینا، همدان، ایران
3 استادیار گروه عمران، دانشگاه بوعلی سینا، همدان، ایران
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Alkali-Silica Reaction (ASR) is identified as one of the reasons for destruction of the concrete structures and poses a threat to its durability. ASR causes the cement paste to expand, crack, and consequently weakens the strength of the concrete. The simplest solution to prevent ASR is to test aggregates' reactivity potential, identify the reactive ones, and then exclude them from the concrete mix. This research aims to examine the impact of fine and coarse reactive aggregate on (1) the mechanical properties of damaged concrete including compressive strength, tensile strength, and modulus of rupture, and (2) the extent of expansion that occurred over time due to the occurrence of this phenomenon. To this aim, four concrete mixtures are made using different combinations of fine and coarse aggregates, that could be reactive or nonreactive, with a water-cement ratio of 0.5. According to the results, the concrete mix whose reactive part was only sand or only gravel expanded 4.4 or 3.5 times over the control mix design (a concrete mixture that is only made of non-reactive aggregates), respectively. Furthermore, using fine reactive aggregates in the concrete mixture reduces compressive strength, tensile strength, and modulus of rupture compared to using coarse reactive aggregates. Therefore, replacing reactive sand with non-reactive sand is recommended as a more effective solution to control the ASR, compared to replacing reactive gravel with non-reactive gravel.
کلیدواژه‌ها [English]
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