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Advances in Materials Research
  Volume 10, Number 3, September 2021 , pages 211-227
DOI: https://doi.org/10.12989/amr.2021.10.3.211
 

Correlation of strength development of RCA in quaternary blended cementitious system
M.V.S.S. Sastri, K. Jagannadha Rao and V. Bhikshma

 
Abstract
    Recycled concrete aggregate (RCA) obtained from demolished structures can be used for concrete making, and is established as a promising material in the field of construction. In the present study, the effect of RCA on the mechanical properties of different strength concretes admixed with Micro silica, fly ash and nano-silica as a part replacement to cement was considered. The quantity of cement varied from 350-690 kg/m3 with the additions of Fly ash at 0, 20 and 30%, micro silica at 0, 5, 10 and 15%, and Nano silica at 0, 1, 2, 3 and 4%. The samples were cured for 7, 28, 56 and 90 days and tested for Compressive strength. Split tensile and flexural strength evaluation was carried out on samples which have been cured for 28 days. The workability of fresh concrete was determined. With the help of the tested database, equations for prediction of compressive strength using modified Bolomey's equation were generated. Equations for the flexural strength and split tensile strengths based on compressive strength were developed and compared with equations available in the literature.
 
Key Words
    Bolomey's equation; Construction & Demolition (C&D) waste; fly ash (FA); mechanical properties; Micro silica (SF); Nano silica (NSF)
 
Address
(1) M.V.S.S. Sastri:
Department of Civil Engineering, Vasavi College of Engineering (A), Ibrahimbagh, Hyderabad, 500 031, Telangana, India;
(2) K. Jagannadha Rao:
Department of Civil Engineering, Chaitanya Bharathi Institute of Technology (A), Hyderabad, 500 075, Telangana, India;
(3) V. Bhikshma:
Department of Civil Engineering, University College of Engineering (A), Osmania University, Hyderabad, 500 007, Telangana, India.
 

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