Use of Heavy Oil Fly Ash as a Color Ingredient in Cement Mortar

Abdullah Mofarrah,Tahir Husain

doi:10.1007/s40069-013-0042-3

Abstract

Heavy oil fly ash (HOFA) is a byproduct generated by the burning of heavy fuel oil. Chemical analysis showed that HOFA is mainly composed of unburned carbon with a significant amount of heavy metals. Due to toxicity, management of this waste poses a challenge to the industry personal. The present study investigates the possible use of HOFA as a black pigment or admixture in cement mortar aiming to produce ornamental brick. In order to investigate the change of cement mortar strength when HOFA is added, the standard compressive strength test with 50 mm cubes was performed. The results showed that the addition of 2–5 % of HOFA in cement mortar does not affect its strength. The leaching behavior of trace elements within HOFA and HOFA mixed mortar were investigated through laboratory batch leaching experiments. The results confirmed that HOFA can be utilized as a black pigment in ornamental brick, which is environmentally safe and provides good balance between color and brick properties.

Highlights

According to ASTM C618-08 fly ashes are distinguished in two classes (F and C)
The objective of this study is to investigate the use of Heavy oil fly ash (HOFA) as a black pigment or admixture in cement mortar aiming to use in ornamental brick
The results show that the addition of 2 or 5 % of HOFA in cement mortar does not affect the quality of mortar

Summary

Introduction

According to ASTM C618-08 fly ashes are distinguished in two classes (F and C). Class F is rarely cementations when mixed with water alone possessing pozzolanic properties. Class F fly ash requires a cementing agent, such as Portland cement, hydrated lime, with the presence of water in order to react and produce cementitious compounds. Unlike Class F, Class C fly ash exhibit usually cementations in addition to pozzolanic properties, it does not require an activator. In the presence of water, Class C fly ash will harden and gain strength over time. The recycling of fly ash has become an increasing concern due to increasing landfill costs, strengthening environmental regulations, and current interest in sustainable development (Mofarrah and Husain 2013). Many applications have been developed for coal fly ash as a cement replacement material in concrete

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