CORRELATION BETWEEN NORMAL AND ACCELERATED CURING STRENGTH OF CONCRETE MIXTURES
DOI:
https://doi.org/10.55766/sujst6711Keywords:
Accelerated Curing Strength, Boiling Water Technique, Concrete Strength, OPC-43 Grade, OPC-53 grade, PPC, PSC, Regression AnalysisAbstract
Indian cement industries produce various types of cement. Among them, the most prevalently used general-purpose cements are ordinary Portland cement (OPC), Portland pozzolana cement (PPC), and Portland slag cements (PSC). Today modern construction and advanced construction techniques bring a sharp focus on the evaluation of strength parameters at an early age. This will enable quality control measures from time to time and in taking quick decisions on corrective measures. Prediction of the early age strength of concrete is essential, particularly for the manufacture of structural precast components. There are different methods available to predict the strength of concrete at an early stage. The scope investigation of the present correlation equation given in IS: 9013 was released in 1978, and is based on the age-old cement of Indian cement industries. Today the morphology of Indian cements has undergone a sea change with different chemical and mineralogical compositions. In the present investigation, the relation between the 28-day strength of normally cured concrete and accelerated cured concrete strength by boiling water techniques has been evaluated. Six ranges of water cement ratios have been used. The linear regression analysis has been carried out to establish the relationship between the actual 7-28 days strength with accelerated strength. A linear relationship has been found to fit very closely between the accelerated and the actual compressive strength of concrete made out of different brands and types of cement. In all the cases the coefficient of regression is found to be greater than 0.90. Further, a comparison has been made with the relation recommended by IS: 9013.
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