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The feasibility of using natural self-ground rice husk ash in structural concrete



Title: The feasibility of using natural self-ground rice husk ash in structural concrete
Author(s): G.C. Isaia, A.L.G. Gastaldini, L. Meira, M. Duart and R. Zerbino
Paper category : conference
Book title: 2nd International RILEM Conference on Progress of Recycling in the Built Environment
Editor(s): V.M. John, E. Vazquez, S.C. Angulo, C. Ulsen
e-ISBN: 978-2-35158-122-3
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 185 - 206
Total Pages: 23
Nb references: 28
Language: English


Abstract: The construction sustainability depends, in great part, of the cement substitution by mineral additions, mainly by-products such as fly ash, slag or rice husk ash. One of the main causes of the low rice husk ash utilization in structural concrete is its unavailability in the market, under the ground ash form, probably due to technical, financial or marketing matters. So, this work aims at studying the technical viability on the use of natural self-ground rice husk ash in structural concrete by placing it together with the aggregates, inside de mixer drum. A reference mixture with type CPIIF Portland cement with 0.45, 0.55 and 0.65 water/binder ratio, two mixtures with pre-ground and natural self-ground rice husk ash with 15% and 25% cement substitution, were tested. Axial compression strength, tensile strength by diametric compression, elasticity modulus and total shrinkage tests were accomplished. The results permit to conclude that it is possible to substitute 15% of cement by natural self-ground rice husk ash directly inside the mixer drum, without significant losses to their mechanical properties or shrinkage, because of the compact microstructure, similar to the pre-ground one.


Online publication: 2012-02-08
Publication type : full_text
Public price (Euros): 0.00