Abstract
This paper investigates the influence of different amounts of recycled coarse aggregates obtained from a demolished RCC culvert 15 years old on the properties of recycled aggregate concrete (RAC). A new term called “coarse aggregate replacement ratio (CRR)” is introduced and is defined as the ratio of weight of recycled coarse aggregate to the total weight of coarse aggregate in a concrete mix. To analyze the behaviour of concrete in both the fresh and hardened state, a coarse aggregate replacement ratio of 0, 0.25, 0.50 and 1.0 are adopted in the concrete mixes. The properties namely compressive and indirect tensile strengths, modulus of elasticity, water absorption, volume of voids, density of hardened concrete and depth of chloride penetration are studied. From the experimental results it is observed that the concrete cured in air after 7 days of wet curing shows better strength than concrete cured completely under water for 28 days for all coarse aggregate replacement ratios. The volume of voids and water absorption of recycled aggregate concrete are 2.61 and 1.82% higher than those of normal concrete due to the high absorption capacity of old mortar adhered to recycled aggregates. The relationships among compressive strength, tensile strengths and modulus of elasticity are developed and verified with the models reported in the literature for both normal and recycled aggregate concrete. In addition, the non-destructive testing parameters such as rebound number and UPV (Ultrasonic pulse velocity) are reported. The study demonstrates the potential use of field recycled coarse aggregates (RCA) in concrete.
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Abbreviations
- ASTM:
-
American Society for Testing and Materials
- BIS:
-
Bureau of Indian Standards
- CA:
-
Coarse aggregates
- CRR:
-
Coarse aggregate replacement ratio
- E :
-
Modulus of elasticity
- FA:
-
Fine aggregates
- f ck :
-
Compressive strength
- f f :
-
Flexural strength
- f sp :
-
Split tensile strength
- ITZ:
-
Interfacial transition zone
- MCRR:
-
Mix with coarse aggregate replacement ratio
- OPC:
-
Ordinary Portland cement
- RAC:
-
Recycled aggregate concrete
- RCA:
-
Recycled coarse aggregates
- SSD:
-
Saturated surface dry
- TIFAC:
-
Technology, Information, Forecasting and Assessment Council
- UPV:
-
Ultrasonic pulse velocity
- w/c:
-
Water/cement ratio
- ρ:
-
Density of concrete
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Acknowledgements
The work presented in this paper is a part of Doctoral Thesis carried out by first author, who has received financial support from UGC, Government of India. The authors acknowledge the supplier of Sika Viscocrete Superplasticiser, SIKA India Pvt. Ltd., Kolkata.
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Chakradhara Rao, M., Bhattacharyya, S.K. & Barai, S.V. Influence of field recycled coarse aggregate on properties of concrete. Mater Struct 44, 205–220 (2011). https://doi.org/10.1617/s11527-010-9620-x
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DOI: https://doi.org/10.1617/s11527-010-9620-x