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The Research of Alkali Reactivity Potential and the Preventive Measure

WU Ding yan,FANG Kun he,ZENG Li,LIU Yong he,RUAN Yan[KH2D](Wuhan University of Hydraulic and Electric Engineering,Wuhan 430072,China)  
Alkali reactivity potential test have been carried out with Chinese rapid method for identification of alkali reactivity of aggregate and ASTM C1260 94 As a result,the aggregate is alkali reactivity one and the main reactive ingredient is reactive SiO 2.The measure adding fly ash to mortar bar to prevent the AAR has been studied.The result is that every contend of fly ash made in Chongqing Huaneng used to replace cement is an effective measure to reduce the expansion in mortar bar due to ARR,and the 30%(or more) fly ash is sufficient to prevent damaging expansion.
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