J. Alipio(1), S. Anciado(2), K. Matalang(3), E. QUEZON(4*)
Natural river sand is often contaminated with varying quantities of silt, clay, and other organic impurities that adversely affect the quality of concrete. This research investigates the effects of silt and clay content on the compressive and flexural strengths of standard grade concrete. Sand samples were purposively collected from three locations, Site A, B, and C, while a control sample with slight impurities was obtained from Site D. Concrete cubes and beams using the same cement, coarse aggregate, and water ratios were tested at 14 and 28 days. The control sample obtained a compressive strength of 24.89 MPa, while the samples with 3, 4, 5, and 6 silt and clay attained 21.63, 17.18, 17.07, and 13.61 MPa, respectively. Flexural strengths follow a similar pattern, with only the control sample satisfying the minimum standard requirements. Results showed that increasing the silt and clay content decreases the compressive and flexural strengths. Hence, proper testing and washing to remove contaminated fine aggregates is strongly recommended prior to use in construction.
Keywords:
Published on 01/11/25Submitted on 01/11/25
Volume 1, Issue Issue-2, December, 2025DOI: https://doi.org/10.5281/zenodo.17563490Licence: Other
Views 4Recommendations 0
Are you one of the authors of this document?