Properties and Leachability of Self-Compacting Concrete Incorporated with Fly Ash and Bottom Ash

International Conference on Innovative Research - ICIR Euroinvent 2016

Kadir, Aeslina Abdul^1 ; Hassan, Mohd Ikhmal Haqeem^2 ; Jamaluddin, Norwati^1 ; Abdullah, Mohd Mustafa Al Bakri^2,3

Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Batu Pahat Johor

86400, Malaysia^1

Center of Excellence Geopolymer and Green Technology (CeGeoGTech), School of Material Engineering, Universiti Malaysia Perlis (UniMAP), Perlis, Malaysia^2

Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP), Perlis, Malaysia^3

关键词: Coal-fired power plant;    Fresh and hardened properties;    Metals concentrations;    Normal weight concrete;    Ordinary Portland cement;    Replacement for sand;    Selfcompacting concretes (SCC);    Toxicity characteristic leaching procedures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/133/1/012039/pdf
DOI  :  10.1088/1757-899X/133/1/012039

来源: IOP

【 摘 要 】

The process of combustion in coal-fired power plant generates ashes, namely fly ash and bottom ash. Besides, coal ash produced from coal combustion contains heavy metals within their compositions. These metals are toxic to the environment as well as to human health. Fortunately, treatment methods are available for these ashes, and the use of fly ash and bottom ash in the concrete mix is one of the few. Therefore, an experimental program was carried out to study the properties and determine the leachability of selfcompacting concrete incorporated with fly ash and bottom ash. For experimental study, self-compacting concrete was produced with fly ash as a replacement for Ordinary Portland Cement and bottom ash as a replacement for sand with the ratios of 10%, 20%, and 30% respectively. The fresh properties tests conducted were slump flow, t500, sieve segregation and J-ring. Meanwhile for the hardened properties, density, compressive strength and water absorption test were performed. The samples were then crushed to be extracted using Toxicity Characteristic Leaching Procedure and heavy metals content within the samples were identified accordingly using Atomic Absorption Spectrometry. The results demonstrated that both fresh and hardened properties were qualified to categorize as self-compacting concrete. Improvements in compressive strength were observed, and densities for all the samples were identified as a normal weight concrete with ranges between 2000 kg/m3to 2600 kg/m3. Other than that, it was found that incorporation up to 30% of the ashes was safe as the leached heavy metals concentration did not exceed the regulatory levels, except for arsenic. In conclusion, this study will serve as a reference which suggests that fly ash and bottom ash are widely applicable in concrete technology, and its incorporation in self-compacting concrete constitutes a potential means of adding value to appropriate mix and design.