Prediction of 28 days strength of ternary blended recycled aggregate concrete by accelerated curing method

Abstract

The development in the use of concrete has led to an unacceptably high reliance on natural aggregates. Typically, these organic materials account for 70% or more of the overall volume of a concrete mix. Recycled aggregates, which are often discarded in landfills but may also be obtained from building and demolition waste, have lately attracted a lot of attention. The current study aims to evaluate the strength of concrete after 28 days using an accelerated curing procedure on various grades of concrete, where natural coarse aggregate is partially replaced by recycled aggregate and cement is largely replaced by other pozzolanic ingredients. Several types of concrete are used in this project. The concrete grade, which ranges from M30 to M70, is one of the factors being examined. 25 percent, 50 percent, and 75 percent are the various replacement percentages, respectively. Investigational criteria included compressive strength and slump measurements of the material's workability. The results are given after the information obtained in this manner was used to create graphs for compressive strength values and recycled aggregate percentages. The results are examined by plotting histograms for compressive strength values and binder substitutions, followed by a discussion of the findings. Regression analysis is performed in combination with the data gained in this way for the specimen that was subjected to an accelerated curing procedure to forecast the strength after 28 days. As compared to the actual values found during testing, the predicted strengths were within the permitted range of +/-5%. The majority of the solutions produced by applying the equation are found to be in reasonable agreement with the values discovered via testing.