Effects of Height to Diameter Ratio on Compressive Strength of Recycled Aggregate Concrete

Abstract

Green concrete is an active area of research for being the need of the day. This research article presents a laboratory investigation for the determination of strength correction factor due to different height (H) to diameter (D) ratio of cylinders made by using green concrete. Green concrete is produced by using demolished waste as coarse aggregates in 50% proportion of total coarse aggregates. Standard H/D ratio ensures proper strength of the concrete being used; otherwise, strength correction will be required for quality check and control of the concrete. Therefore, this research work is aimed at developing the correction coefficients. To achieve this purpose, total 45 concrete cylinders in nine batches are prepared using 1:2:4 mix and 0.45 water-to-cement ratio. One batch of cylinders with H/D ratio
equal to 2 is prepared using conventional coarse aggregates only. These cylinders are used as control specimens to compare the results of the proposed concrete. For the rest of the batches of cylinders, H/D ratio is varied from 2.0 to 0.6 with a decrement of 0.2. After casting, compacting and curing for 28-days in standard fashion, all the specimens are tested for compressive strength in a universal testing machine. From the obtained results, the corrections factors for the compressive strength are developed. These factors are used to correlate the compressive strength of non-standard H/D ratio cylinder to compressive strength of standard H/D ratio cylinder. The results obtained from this reserach are very helpful for quality control and strength inspection.