By Marco Pepe
This ebook experiences at the actual and mechanical characterization of Recycled combination Concrete (RAC), produced via a partial-to-total substitute of normal aggregates with what were dubbed Recycled Concrete Aggregates (RCAs). It proposes a theoretical framework for figuring out the relationships among RCAs and RCA, and for predicting the ensuing habit of RAC. The booklet demonstrates that during the case of RAC extra parameters need to be taken under consideration than with traditional aggregates, end result of the composite nature and better porosity of RCAs. by way of extending Abrams’ legislations for Recycled combination Concrete, it represents a primary step within the formula of a normal version for predicting the homes of RAC. The theoretical technique provided right here addresses an immense hole within the literature and is anticipated to stimulate new examine at the use of this extra sustainable type of concrete in structural applications.
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Extra info for A Conceptual Model for Designing Recycled Aggregate Concrete for Structural Applications (Springer Theses)
Conversely, the processing procedure implemented for producing recycled aggregates is generally designed by operator companies, according to their speciﬁc practices. 8 Main Conclusions Drawn from Existing Regulations and Standards 25 A total replacement of coarse natural aggregates is allowed only for non-structural concrete, due to the decrease of compressive strength that generally occurs considering the recycled material source. In this sense, it is useful to clarify that RILEM Recommendations do not report the origin of recycled aggregates, so the relative maximum compressive strength value is referred to a very good quality of source material.
This means that the bond strength between RCA and paste was stronger than the tensile strength of the particle. In fact, the RCAs are characterised by a more irregular shape compared with natural ones and for this reason the ITZ results stronger than its mechanical strength. Certainly, in the future, more tests should be performed for better estimating the bond strength value of the aggregates in concrete, but the proposed methodology is a ﬁrst step to deﬁne a standardised test for these measurements.
CSIRO. (2002). Guide to the use of recycled concrete and masonry materials (HB 155). Australia: Commonwealth Scientiﬁc and Industrial Research Organisation Standards. DAfStb. (1998). Guideline of the German committee for reinforced concrete. Germany: Deutscher Ausschuss für Stahlbeton. DIN 4226-100:2002. Aggregates for concrete and mortar—Part100: Recycled aggregates. Germany: Deutsches Institut für Normung. EN 12620:2013. Aggregates for concrete. CEN, European Committee for Standardization. Hansen, T.