Strength, elastic modulus, and creep of high-strength concrete produced with bagasse ash and recycled concrete aggregate

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Author list: Rattanachu P., Tangchirapat W., Jaturapitakkul C., Chindaprasirt P.

Publisher: ASTM International

Publication year: 2019

Journal: Journal of Testing and Evaluation (0090-3973)

Volume number: 49

Issue number: 2

ISSN: 0090-3973

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071309043&doi=10.1520%2fJTE20180427&partnerID=40&md5=cdac0d587f011f3794454acfc185417b

Languages: English-Great Britain (EN-GB)

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Abstract

In this study, the mechanical properties of a high-strength recycled concrete (HS-RC) incorporating ground bagasse ash (GBA) were evaluated. Recycled coarse aggregate (R-CA) from concrete demolition was used as a full replacement for natural coarse aggregate (N-CA). The GBA was used to partially substitute 20-50 wt. % of the ordinary portland cement cementitious material. The results indicated that the replacement of N-CA by R-CA led to a slight reduction in the compressive strength of the concrete compared with that of conventional high-strength (CT) concrete. However, the R-CA had a clear negative impact on the elastic modulus and creep strain of the HS-RC. The HS-RC mixtures prepared with 20 wt. % GBA had a higher compressive strength than the CT concrete at later ages (90 days or more). Likewise, the GBA slightly reduced the creep strain, whereas the HS-RC with and without GBA had an approximately 20 % lower elastic modulus than the CT concrete. In addition, the creep strain of concretes containing R-CA and GBA was related to their modulus of elasticity and compressive strength, which could be calculated by a proposed equation and were compared with the results from the predicted model given by ACI 209.2R-08, Guide for Modeling and Calculating Shrinkage and Creep in Hardened Concrete. ฉ 2019 by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959

Keywords

Creep strain, Recycled coarse aggregate