Improvement of repairing mortars in cold environments using coal bottom ash

Author(s): C. Argiz, E. Menéndez
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 53 – 55
Total Pages: 3
Language: English

Abstract: 
Durability in cold environments of mortars made of ordinary Portland cement, bottom ash and pulverized fuel fly ashes obtained from a coal electrical power stations in Spain have been investigated. This paper presents the experimental investigations carried out to study the effect of use of bottom ash (the coarser material, which falls into furnace bottom in modern large thermal power plants and constitute about 10–15% of total ash content of the coal fed in the boilers) as a replacement of fly ash. The performance of both fly and bottom ashes was investigated in terms of the hydration characteristics and microstructure, when exposed to cold environments. The following compositions were considered: Cement + (fly ash + bottom ash) replacement level up to 35%. The (fly ash + bottom ash) consisted of a
bottom ash replacement of 50 and 100% of fly ash in the ashes mix. Use of fly ash beyond 35 percent is allowed in Europe, but the use of bottom ash is presently not permitted as pozzolanic addition in cement nor concrete. The use of coal bottom ash in Portland cement is a new dimension in pozzolanic repairing mortars cement and if applied in standarized Portland cement would revolutionize the cement industry, by economizing the production cost and decreasing the ash content. From the results, the use of bottom ash up to 15 percent as pozzolanic addition in cement repairing mortars is strongly recommended.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00