Fresh, Mechanical, and Durability Characteristics of Self-Consolidating Concrete Incorporating Volcanic Ash
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 7
Abstract
Self-consolidating concrete (SCC) is known for its excellent deformability, high resistance to segregation, and use in congested reinforced concrete structures characterized by difficult casting conditions without applying vibration. The use of known mineral admixtures such as fly ash and slag cement has proved very effective in the production of nonexpensive SCC with satisfactory fresh and hardened properties. However, the use of volcanic ash (VA) in SCC is new and can provide low cost SCC. This paper presents fresh, mechanical, and durability characteristics of VA based SCC mixtures (VA-SCCs). VA-SCCs are developed by varying water-to-binder ratio, percentages of VA as cement replacement, and dosages of superplasticizer (SP). Mix design parameters are optimized to achieve minimum use of SP and optimum use of VA. The fresh concrete properties are determined from slump flow, V-funnel flow time, bleeding, air content, and segregation tests. The mechanical properties and durability characteristics such as compressive strength, freezing-thawing resistance, rapid chloride permeability, surface scaling resistance, and drying shrinkage are determined to evaluate the performance of VA-SCCs. The study produces encouraging results and confirms the production of satisfactory VA based SCC mixtures with acceptable properties. VA-SCCs having a minimum strength of 15 MPa (requirement for some structural concrete applications) can be obtained by replacing up to 50% (by mass) of cement by VA. Development of nonexpensive and environmental friendly VA-SCC with acceptable strength and durability characteristics (as illustrated in this study) is extremely helpful for the sustainable development and rehabilitation of volcanic disaster areas around the world.
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Acknowledgments
The writers are grateful to the Technical Staff of the Materials Laboratory of the Dept. of Civil Engineering of PNG, University of Technology. The assistances of PNG Halla Cement Factory and of the PNG Dept. of Public Works are also acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 7 • July 2010
Pages: 651 - 657
Copyright
© 2010 ASCE.
History
Received: Mar 12, 2009
Accepted: Nov 4, 2009
Published online: Nov 6, 2009
Published in print: Jul 2010
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