Mechanical Properties of Cement Mortar Made with Black Tea Waste Ash as a Partial Replacement of Cement


Abstract- Environmental pollution and the relatively high cost of waste disposalhas been a major focus for scientists around the world, leading researchers to finda solution to reuse waste materials in different applications. Iraqi people consumehundreds of tons of black tea each year, which produce a large quantity of theused tea, leaves as waste. These large quantities go to landfills without any benefitor recycling. Additionally, landfills are considered one of the biggest crisis facingthe Iraqi government. Therefore, this study aims to recycle the black tea waste ash(BTWA) by utilizing it as a partial replacement of cement. Cement mortar mixescontaining five replacement levels of cement with BTWA (0%, 2.5%, 5%, 7.5%and 10% by weight) were carried out. The compressive strength and flexuralstrength tests were adopted to show the effect of BTWA on mechanical propertiesof cement mortar. The flow rate of fresh mortar was also measured. Resultsindicated that, up to 7.5% replacement, the compressive strength values wereimproved. For 10% replacement, the compressive strength values were equal tothat for control specimens. In contrast, the BTWA had a negative impact on theflexure strength of mortar at replacement levels 5%, 7.5% and10%. For 2.5%substitution, however, the flexure strength was enhanced slightly (about 2%).