Tobacco waste ash: a promising supplementary cementitious material

Abstract

According to the European Cement Association, CEMBUREAU, in 2015, the global cement production was 4.6 billion tons. Traditional cement production emits approximately 1 ton of CO 2 per ton of cement, which represents almost 80% of the total CO 2 emissions of concrete and approximately 6% of the world's emissions. Among supplementary cementitious materials, the use of agro-waste ash emerges due to its reduced CO 2 emissions, chloride diffusion, and materials cost, in addition to its greater compressive strength. In Colombia, the disposal of agro-wastes, such as tobacco waste, is an environmental and economic concern. In this study, ash obtained from tobacco waste (TWA) was studied as a sustainable partial replacement for cement in hydraulic concrete. The TWA was reduced to a particle size of less than 75 μm and was characterized by X-ray florescence. A central composite design was used to study the influence of the ash replacement percentage of cement and the water/binder (w/b) ratio on the compressive strength at 28 days. The results show that it is possible to replace 10% of the cement with TWA using a 0.5 w/b ratio and obtain a 51% higher compressive strength than the control mixture at 28 days. Moreover, the experimental results demonstrated an improvement of 86% in the 7-day compressive strength when TWA was used.

Waste Material Ashes Used in Concrete

“…Chemical analysis of T.W.A. revealed that it contains considerable amount of CaO, SiO 2 , K 2 O, MgO and Al 2 O 3 [10]. Total volume of SiO 2 , Al 2 O 3 and Fe 2 O 3 was found to be less than 70%, which is minimum limit to be considered as a pozzolanic material.…”

“…Studies were conducted to evaluate possibility in usage of waste tobacco material ash in concrete. Properties were studied with different replacement levels of tobacco waste ash [10]. On density basis, lightweight concrete is categorized into three classes.…”

“…Moreeno (2018) targeted strength of M30 by replacing up to 40 % of cement in concrete mix with tobacco waste ash. Mix design was done as per British standards and OPC was used for study [10].…”

Integration of Rice Husk Ash as Supplementary Cementitious Material in the Production of Sustainable High-Strength Concrete

“…Since a variety of agricultural and industrial residues have characteristics that are acceptable for concrete manufacturing, a detailed examination of their possible use in making concrete offers significant potential to improve resource efficiency. Agricultural as well as other wastes such as palm oil fuel ash [10], sugarcane bagasse ash [11], oyster shell [12,13], sawdust [14,15], groundnut shell [16,17], coconut shell [18,19], tobacco waste [20,21], and so many more have been demonstrated to efficiently perform as a partial substitute inside the concrete mass, expanding the concrete properties satisfactorily.…”