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Predictive Model of Compressive Strength for Concrete In-Situ

Jayant Damodar Supe1 and M K Gupta2
1. Department of Civil Engineering, RCET, Bhilai, India
2. Department of Civil Engineering, Bhilai Institute of Technology, Durg, India

Abstract—It is imperative to know the rate at which the concrete in-situ with given concrete mix design would gain strength. Above information is useful to develop a mathematical model which can immediately predict the value of compressive strength of concrete in-situ. It is required for following reasons: (i) conventionally the concrete achieves 90% of its targeted compressive strength in 28 days of curing at site. If strength is checked only after 28 days and found weak then structure might fail due to poor mix design. It would cause major financial losses as well hurt the workers responsible to dismantle the form works. (ii) It would be more useful if the results of test cubes can be known within few hours after they have been cast. The cubes are cured with wet gunny bags for 23 hours and then placed in a tub of boiling water at 100°C temperature for 3½hours±5mins[8], before they are tested in compressive testing machine. The other cubes are immersed in water bath at room temperature for 28 days. After 3 days three cubes are taken out and placed in boiling water tub at 100°C for 3½hours±5mins before testing for compressive strength. The remaining cubes were immersed in water at room temperature 27°C , and are tested after 7 and 28 days for their compressive strength. In this paper a study is made to compare compressive strength of cubes by normal as well as accelerated curing and mathematical model is developed from compressive strength observed for 28 days. 

Index Terms—compressive strength of concrete, similitude model analysis, compressive strength tests, accelerated curing, normal curing

Cite: Jayant Damodar Supe and M K Gupta, "Predictive Model of Compressive Strength for Concrete In-Situ," International Journal of Structural and Civil Engineering Research, Vol. 3, No. 1, pp. 90-102, February 2014.