Title:
Comparison Among Different Mix-Design Procedures for RCA Concrete
Author(s):
Diego Jesus De Souza, Leandro Sanchez, Faraz Ahimoghadam and Gholamreza Fathifazl
Publication:
Symposium Paper
Volume:
334
Issue:
Appears on pages(s):
99-121
Keywords:
recycled concrete aggregate, equivalent mortar volume method, modified equivalent mortar volume method, equivalent volume method
DOI:
10.14359/51720255
Date:
9/30/2019
Abstract:
Various studies on the use of recycled concrete aggregate (RCA) were developed in the past decades. Yet, very often direct replacement techniques are adopted to proportion RCA
concrete, which leads to inferior performance of the recycled material when compared to conventional concrete. RCA is a multi-phase material comprised of original virgin aggregate
and residual mortar (RM) and thus these distinct phases should be considered during the RCA mix-design process. The Equivalent Mortar Volume (EMV) mix-design method accounts for the RM to proportion RCA concrete. Although great results are normally achieved in the hardened state, EMV-designed mixtures may present important challenges in the fresh state.
Modifications of the original EMV such as the modified-EMV and the Equivalent Volume method were recently proposed to tackle issues related to the fresh state and binder efficiency
of recycled mixtures. This paper discusses the differences among the recent mix-design procedures developed to proportion RCA concrete.
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