A Sustainable Cement Replacement Material From a Coal-Fired Power Plant Waste


Electrical energy is an important in a daily life. Coal is a primary fuel for electricity production. The waste from the coal-fired electricity generation is a fly ash. The numerous fly ash is a low quality fly ash (LQFA). LQFA is a low reactivity ash, and is a hazardous waste. Normally, LQFA is stored in landfills. The heavy metals can leach from the stored LQFA into an environment, which is a serious problem. The sustainable ways to solve the problem is to utilize LQFA as a valuable material. Although, cement is widely used in the construction work, it is an environmental unfriendly material. The high quantities of carbon dioxide gas are emitted from the cement producing process. Geopolymer is expected to be a sustainable cement replacement material due to its manufacturing process does not emit a carbon dioxide gas. Furthermore, geopolymer can be synthesized from the various types of waste materials The aim of this work is to develop the geopolymer by using the LQFA and a calcined clay (CC) as a precursor. The results show that the compressive strength of LQFA-CC-geopolymer is higher than that of the commercial cement. The compressive strength of LQFA-CC-geopolymer is increased with increasing the concentration of NaOH and the ratio of Na2SiO4 to NaOH solution. The knowledge of this work opens an opportunity to utilize LQFA as a usable waste to reduce an environmental impact of the coal-fired electric power plant.

Author Information
Nuttapong Phachan, Suranaree University of Technology, Thailand
Siriwan Chokkha, Suranaree University of Technology, Thailand
Anurat Poowancum, Suranaree University of Technology, Thailand

Paper Information
Conference: ACSEE2017
Stream: Environmental Sustainability & Human Consumption: Waste

This paper is part of the ACSEE2017 Conference Proceedings (View)
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Posted by James Alexander Gordon