TY - CONF A1 - Kositz, Mario A1 - Hünger, Klaus-Jürgen T1 - A predicitve model for the assessment of aggregate sensitivity to ASR T2 - ICCM, 10th ACI/RILEM International Conference on Cementitious Materials and Alternative Binders for Sustainable Concrete, 2017, Montreal, Kanada N2 - Different aggregates stored in alkaline solutions have different solubility of silica and alumina. The dissolved silica reacts with water and alkalis to form an alkali silica gel, which can swell. ASR swelling can be reduced or prevented, if enough space is available for the alkali silica gel formation. This “space” is the open porosity, which can also be determined directly at the aggregate grains. Concrete specimens made with different aggregates were produced. They all were stored in a fog chamber at 104°F (40°C) and the ASR swelling was measured for one year. At the same time, the aggregates were stored in 0.1 mol KOH solution at 176°F (80°C) for 56 d only. The solubility of silica and alumina was determined continuously by ICP-OES. The obtained dissolution rates, open porosity and expansion data were compared and a reliable model for predicting the ASR sensitivity of concrete aggregates was derived. KW - alkali silica reaction KW - modeling KW - aggregate reactivity KW - dissolution of silica and alumina KW - dissolution rate KW - open porosity Y1 - 2018 UR - https://opus4.kobv.de/opus4-UBICO/frontdoor/index/index/docId/21333 UR - https://www-docs.b-tu.de/fg-baustoffe/public/Supp_320_24.pdf PB - RILEM ER -