Concrete with multi-recycled crushed concrete aggregates

سال انتشار: 1396
محل انتشار: چهارمین همایش بین المللی مهندسی سازه
کد COI اختصاصی: ISSEE04_002
زبان مقاله: انگلیسی
تعداد مشاهده: 471

نویسندگان

Full Professor, CERIS-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, ۱۰۴۹-۰۰۱ Lisboa, Portugal

Luís Evangelista

PhD, CERIS-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, ۱۰۴۹-۰۰۱ Lisboa, Portugal

Rui V. Silva

PhD, CERIS-ICIST, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, ۱۰۴۹-۰۰۱ Lisboa, Portugal

چکیده

This paper presents the results of an experimental campaign on the properties of coarse recycled concrete aggregates from different cycles of recycling and their influence on the mechanical and durability performance of multi-recycled recycled aggregate concrete. The recycled concrete aggregates came from three consecutive recycling cycles and were used as partial natural aggregate replacement (25% and 100%, by volume). All specimens were compared with a control concrete with the same mix design, but with natural aggregates only. Generally, the quality of the recycled concrete aggregates is lower than that of the natural aggregates, as a result of the higher old mortar content adhered to original aggregates. An increasing quantity of adhered mortar content was observed as the recycling cycles proceeded. This content stabilized to a point that the recycled concrete aggregates’ properties became predictable as well as its influence to the mechanical and durability performance of the recycled aggregate concrete. The results of this study allowed proving beyond reasonable doubt that the performance of recycled aggregate concrete presents an asymptotical-like decline with increasing number of recycling cycles and progresses in a linear fashion with increasing incorporation of coarse recycled concrete aggregates. Thus, the research is a contribution to the wider use of multiple recycled concrete aggregates, wherein, by knowing the number of generations, the properties of recycled concrete aggregates and of the concrete containing them may be estimated, thereby being capable of being used for a number of construction applications with a good safety level

کلیدواژه ها

Recycled aggregates; concrete; multiple recycling; mechanical; durability

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.