چکیده مقاله
Alkali Silica reactivity in concrete is one of the major causes of concrete deterioration throughout the world This phenomenon is due to reaction between certain types of Silica/Silicates aggregates and the existing alkali materials NaOH or KOH in concrete The produced material SilicaGel is an expansive substance when absorbs water and hence its subsequent excessive tensile stress will cause cracking of the concrete Different types of reactive silica aggregates were selected to make the experimental concrete specimens according to ASTM C 1260 and C 227 for the accelerated ASR tests Lithium Nitrate LiNO3 inhibitor in the form of liquid solution was used in the concrete mix as an admixture to prevent ASR This substance will react with silica gel and produces a non expansive material when absorbing water to prevent cracking In addition to Lithium inhibitor, ground granulated furnace slag, a well known cement substitution pozolan was used in the specimens as a less expensive material Silica fume as a cement replacement material was also used to observe its ASR inhibiting effect Slag and silica fume have a lower Alkali content in comparison to ordinary portland cement and can reduces the rate of ASR Effective recommendations to produce durable concrete resistant to ASR are proposed for the new concrete structures For the existing ASR affected structures, the diagnostic methods to identify ASR are given
کلیدواژهها
نویسندگان
Kamal Mirtalaei
Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
شیوه ارجاع
Mirtalaei, Kamal,1382,Preventing Alkali-Silica Reactivity (ASR) in Concrete Bridges and Pavements,6th International Conference on Civil Engineering,Isfahan
ارائهشده در
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