Studies on Impact Resistance of Self-Compacting Concrete with mechanically treated Recycled Coarse Aggregate

Self-compacting concrete (SCC) is an extraordinary type of concrete that is extremely flowable and spreads into the formwork without the need of external vibration. In order to attain self-compatibility SCC obliges extensively surplus quantity of fine particles as compared to conventional concrete....

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-11, Vol.1197 (1), p.12051
Main Authors: Nune, Srikanth, Dakshina Murthy, N R, Seshagiri Rao, M V
Format: Article
Language:English
Subjects:
Coefficient of variation
Concrete mixing
Formwork
Hammers
Impact resistance
Mathematical analysis
Mixtures
Natural Coarse Aggregate
Processed recycled coarse aggregate
Self-Compacting Concrete
unprocessed recycled coarse aggregate
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Summary:Self-compacting concrete (SCC) is an extraordinary type of concrete that is extremely flowable and spreads into the formwork without the need of external vibration. In order to attain self-compatibility SCC obliges extensively surplus quantity of fine particles as compared to conventional concrete. Recycled Coarse Aggregate (RCA) obtained by crushing of old concrete is used in the investigational analysis. Nan-Su method is used to design the SCC mixes A and B (M35 and M45). The current experimental study aims to evaluate the impact energy of Recycled Coarse Aggregate (RCA) based self- compacting concrete by replacing with Natural Coarse Aggregate (NCA) (25%, 50%, 75%, and 100%) in unprocessed and processed states for various number of revolutions (500R, 1000R, 1500R, 2000R). Tests were carried out with a constant mass of hammer (16.38 kg). The impact energy determined for the Mixes A and B is compared with respect to replacement level and processing of RCA. The impact energy calculated is maximum for mix-A (1500 and 2000 revolutions) and mix-B (2000 revolutions) at 75% and 100% replacement of RCA respectively. From the experimental results of obtained Coefficient of Variation (CoV) with respect to processing of aggregate, in both the mixes it is observed that RCA in unprocessed state and processed state (1500R) has good Coefficient of Variation. Comparing the results of Coefficient of Variation with respect to replacement level of aggregate it has a very good CoV at 25% replacement level of RCA for both the mixes.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1197/1/012051