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Advances in Materials Science and Engineering
Volume 2014, Article ID 832508, 11 pages
Research Article

Experimental Investigation on Use of Wheat Straw Ash and Bentonite in Self-Compacting Cementitious System

1Dipartimento di Ingegneria Strutturale, Edile e Geotecnica (DISEG), Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy
2Department of Structural Engineering, NUST Institute of Civil Engineering (NICE), National University of Sciences and Technology, Sector H-12, 44000 Islamabad, Pakistan
3Department of Civil Engineering, COMSATS Institute of Information Technology, University Road, 22066 Abbottabad, Pakistan
4Dipartimento Scienza Applicata e Tecnologia (DISAT), Politecnico di Torino, Corso Duca Degli Abruzzi 24, 10129 Torino, Italy

Received 2 October 2014; Accepted 13 November 2014; Published 17 December 2014

Academic Editor: Mohd Sapuan

Copyright © 2014 Rao Arsalan Khushnood et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this research, we evaluated the feasibility of wheat straw ash and bentonite (raw and heated at 150°C for 8 hrs) as secondary raw materials in self-compacting paste (SCP). The fresh and hardened properties of SCP formulations including water and superplasticizer demand, flow behavior, compressive and flexural strength development, water absorption, and acid attack resistance were evaluated. Moreover, porosity, microstructural, and mineralogical investigations were also carried out on SCP formulations. Test results showed that the properties of SCP formulations in fresh state depend on the morphology of secondary raw materials. For heated bentonite and wheat straw ash formulations, the 28 days of compressive and flexural strength were higher or almost similar to reference SCP formulation. Among SCP formulations, wheat straw ash formulation was found to be more effective in consuming free lime and showed significant decrease in porosity with time, which in turn improved the resistance of this SCP formulation against water absorption and acid attack. Based on the test results, it can be concluded that the successful utilization of wheat straw ash and bentonite SCP formulations will offer durable and environmental friendly option to construction industry.