Effects of Circulated Fluidized-bed Fly Ash, Ground Granulated Blastfurnace Slag and Coal Fly Ash on Properties and Durability of Mortars

Author(s): Maochieh Chi, Jiang-Jhy Chang and Weichung Yeih
Paper category: Proceedings
Book title: 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye and Klaas van Breugel
Print-ISBN: 978-2-35158-188-9
e-ISBN: 978-2-35158-189-6
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 192-201
Total Pages : 10
Language : English

Abstract: The amount of circulating fluidized bed combustion (CFBC) ash is increasing and the disposal cost of CFBC ash have also been increasing annually. Hence, developing a better utilization of CFBC fly ash with the by-products- ground granulated blast furnace slag (GGBFS) and coal fly ash is an urgent and important task. In this study, seven mixes with different blended cements were prepared to cast mortar specimens. Flow test, setting times test, water absorption rate, compressive strength test, flexural strength test, length change test, and sulphate attack resistance were performed to investigate the properties and durability of mortars. Test results show that the addition of coal fly ash, CFBC fly ash, and GGBFS improves the workability and increases the sulphate attack resistance and reduces the length change of blended cement mortars. When the amount of cement replacement by CFBC fly ash, GGBFS, and coal fly ash was recommended less than 20% simultaneously, the compressive strength and flexural strength are higher than that of plain cement mortar. However, CFBC fly ash would results in a lower strength when adding up to 30%. Thus, the amount of CFBC fly ash replacement cement was recommended to be limited below 20% and the total amount of cement replacement was limitted below 60%.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00