Effects of Local Clay Pot Waste Powder as Partial Cement Replacement on the Mechanical Properties of Concrete

Abstract

This research was conducted to examine the suitability of Local Clay Pot Waste Powder as a cement replacing material in the production of C-25 grade concrete as a relief for this problem, the Sample Clay pots were collected from the Ndop vicinity. The samples which were fired at the temperature of 750°C, were ground to the fineness of 400µm. Normal consistency of the paste containing Ordinary Portland Cement and LCPWP from 0% to 20% replacement in a 10% increment interval was tested and found not to have much effect. That is for normal cement, it had a consistency of 29%, for 10% replacement, 28.5% was obtained and for 20% replacement, 28% was obtained. The compressive and split tensile strength of 54 different concrete test cubes of 100x100x100mm and flexural strength of 27 beams of 40x40x160mm with the LCPWP replacing the ordinary Portland cement prepared for 25MPa concrete with water-cement ratio of 0.5 and 395 kg/m³ cement content, we casted and crushed (for 7^th, 14^th and 28^th days targeted compressive strength). The properties of the cubes were tested at the hardened state and a compressive strength of 25.16MPa, 15.43MPa, and 11.70MPa for the Control, 10% and 20\\% mixtures respectively were obtained. These mixtures failed to achieve the targeted strength of C-25. For the split tensile strength, a 28 days strength of 3.13MPa, 2.15MPa and 1.47MPa was obtained. From the above values, it can be concluded that LCPWP with the properties obtained in this study is not suitable to replace cement partially.