Journal
ENGINEERING STRUCTURES
Volume 33, Issue 3, Pages 1025-1033Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2010.12.025
Keywords
Reinforced concrete; Shear strength; Mix proportioning; Waste management
Categories
Funding
- Department of Public Works and Government Services Canada
- Department of Natural Resources Canada
- Natural Sciences and Engineering Research Council of Canada
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The applicability of some major concrete design standards and other pertinent methods to calculate the concrete contribution to the shear resistance of reinforced recycled concrete (RRC) beams without stirrups is investigated. Results of a relatively comprehensive experimental program are used to compare the actual shear strength of the tested beams with their corresponding predicted values. The concrete mixes for the RRC beams were proportioned by the so-called Equivalent Mortar Volume (EMV) method. The method is predicated on the fact that recycled concrete aggregate (RCA) is a composite material, comprising mortar and natural aggregate, and the volumetric content and properties of each phase must be quantitatively accounted for when proportioning concrete mixes containing RCA. The test variables included in the test program are shear-span/depth ratio, beam size, RCA source, and coarse aggregate type. The results show that the shear capacity of a RRC beam is comparable, or sometimes superior, to that of a companion beam made of conventional concrete. The analyses performed in the current investigation show, contrary to previous findings, that existing shear design methods, such as the ACI and CSA codes methods, are applicable to RRC beams, provided the EMV method of mix design is used. (C) 2010 Elsevier Ltd. All rights reserved.
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