PREVENTION OF DELETERIOUS ASR BY ASSESSING AGGREGATES AND SPECIFIC CONCRETE MIXTURES

سال انتشار: 1388
محل انتشار: سومین کنفرانس بین المللی بتن و توسعه
کد COI اختصاصی: ICCD03_007
زبان مقاله: انگلیسی
تعداد مشاهده: 2614

نویسندگان

F.A. Finger-Institute for Building Materials Science, Department of Civil Engineering, Bauhaus- University Weimar, Coudraystrasse

Colin Giebson

Jochen Stark

چکیده

Alkali-silica reaction (ASR) is a major world-wide durability problem and concretes exposed to external alkalis are particularly endangered. In Germany, concrete pavements have a long tradition but the experiences over the last years showed, that the currently standardized test methods are not able to consider externally supplied alkalis from deicers sufficiently. Especially alkali acetate and formate based deicers as used for airfields turned out to be extremely deleterious. For this reason, an ASR performance-test that was developed at the Finger-Institute (FIB) is used for some years now to assess specific concrete job mixtures regarding their ASR potential under consideration of externally supplied alkalis. The lab-field correlation of this performance-test was assessed by testing two reproduced pavement concretes that showed ASR-distress in the field after 8-12 years in service. It has been shown that the performance-test was able to assess the tested concretes correctly. Contrary, the mortar-bar test could not predict the field performance of the aggregates correctly in all cases.

کلیدواژه ها

alkali-silica reaction, performance-test, deicer, pavement concrete

مقالات مرتبط جدید

اطلاعات بیشتر در مورد COI

COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.

کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.