Control of Alkali-Silica Expansion by Various Surface Systems
Shigeru MATSUMOTO,Kazunori SASAKI,Yoshio HISARI,Toshiyoshi GOTO and Toyoaki MIYAGAWA
Abstract:This paper presents the results of long term outdoor exposure of specimens made of reactive aggregate and ASR expansion control by various surface penetrant methods, surface coating methods and injection methods. All methods have been able to control the ASR expansion of specimens. Especially, silane penetrant method can control the ASR expansion even if the surface layer removed. And this paper deals with the basic investigations on the amount of impregnated silane in addition to the impregnation depth by applying differential thermal analysis (TG-DTA) of samples obtained from different depths in concrete. A good linear relation between the exothermic peak area of the heat flow curve and the content of silane was confirmed. Key Words:Silane, Alkali silica Reaction, Differential Thermal Analysis, Reactive aggregate