Concrete Compressive Strength Evaluation: Coconut Shell Charcoal as Aggregate

Authors

  • T. Zapanta, V. Santos, I.J.R. Ramos, A.J. Alteza, C. Llenarez, J.R. Santos, R. Cardinal, A. Faicol

Abstract

As the Philippines is a major producer of coconut products and goods, a lot of coconut shell is commonly turned coconut shells into charcoal. Because of this, the researchers evaluated the compressive strength of concrete mixed with coconut shell charcoal. With the objective of this study being focused on the coconut shell charcoal, the said material replaced the common fine aggregate component of concrete. Type I Portland cement, gravel, sand, and said aggregate were incorporated with a cement-sand ratio of 1:3 in a 150x300mm cylinder. 20% of the concrete mixture is composed of the powdered coconut shell charcoal. Consequently, 18 samples – 9 experimental samples and 9 control samples which is the common concrete mixture – were made for this study and was tested on their 7, 14, and 21 curing day counts.  The statistical treatment ‘Paired t-Test: Two Sample Means’ was applied on the results gathered through the Universal Testing Machine (UTM) with the significance level of 95% or 0.05 as prescribed by ASTM International. Three samples were tested per curing day count and the mean of the individual results were taken.  Through the results of this study, the 7, 14, and 21 curing day counts was rejected due to having 10.32 MPa, 13.76 MPa, 16.37 MPa respectively – failing to equal or surpass 65% of 25 MPa or

16.25 MPa for the 7 curing day count, 90% of 25 MPa or 22.50 MPa for the 14 curing day count, and 99% of 25 MPa or 24.75 to 25 MPa for the 21 curing day count. The researchers of this study recommend the lessening or modification of the coconut shell charcoal and the further testing of this experimental concrete through a trial-and-error method. The procedures used in this study are standards from ASTM C192/C192M and ASTM C39/C39M.

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Published

2020-05-18

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Articles