EXPERIMENTAL STUDY ON THE BEHAVIOUR OF RETEMPERED CONCRETE

K. Uma Shankar, K. Arun Prakash, M. Harshavardana Balaji, S. Pradep Kumar

Abstract: Ready–mixed concrete industries, are faced with a common problem known as casting delay, which usually results in a considerable loss of workability, so that concrete may be unworkable. On the other hand, improper methods of handling, lack of site organization, work scheduling and breakdown of equipment are some other causes of unexpected long delays. In such situations engineers at site, many a time reject the concrete partially set and unduly stiffened due to the time elapsed between mixing and placing. It is required to see whether such a stiffened concrete could be used on work without undue harm with use of admixtures. The process of remixing of concrete, if necessary, with addition of just the required quantity of water is known as “retempering” of concrete. The main objective of this research work is to study the behaviour and quality of retempered concrete and making it acceptable in concrete industry which would otherwise go as waste, thus saving the man hours, money and material. To achieve the above objective the workability, near surface characteristics and strength properties of retempered concrete at different time intervals such as, after 15 min, 30 min, 45 min, 60 min, 75 min, 90 min, 105 min and 120 min are found.

Keywords: Retempering, workability, near surface characteristics, strength, behaviour, slump

DOI: https://doi.org/10.15623/ijret.2014.0323055