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Materials 2014, 7(12), 7809-7827; doi:10.3390/ma7127809

On the Utilization of Pozzolanic Wastes as an Alternative Resource of Cement

Department of Civil Engineering, Dhaka University of Engineering and Technology, Gazipur 1700, Bangladesh
Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia
Sika Kimia Sendirian Berhad, Nilai, Negeri Sembilan Dk 71800, Malaysia
Author to whom correspondence should be addressed.
Received: 25 September 2014 / Revised: 11 November 2014 / Accepted: 21 November 2014 / Published: 5 December 2014
(This article belongs to the Section Advanced Composites)
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Recently, as a supplement of cement, the utilization of pozzolanic materials in cement and concrete manufacturing has increased significantly. This study investigates the scope to use pozzolanic wastes (slag, palm oil fuel ash and rice husk ash) as an alkali activated binder (AAB) that can be used as an alternative to cement. To activate these materials, sodium hydroxide solution was used at 1.0, 2.5 and 5.0 molar concentration added into the mortar, separately. The required solution was used to maintain the flow of mortar at 110% ± 5%. The consistency and setting time of the AAB-paste were determined. Mortar was tested for its flow, compressive strength, porosity, water absorption and thermal resistance (heating at 700 °C) and investigated by scanning electron microscopy. The experimental results reveal that AAB-mortar exhibits less flow than that of ordinary Portland cement (OPC). Surprisingly, AAB-mortars (with 2.5 molar solution) achieved a compressive strength of 34.3 MPa at 28 days, while OPC shows that of 43.9 MPa under the same conditions. Although water absorption and porosity of the AAB-mortar are slightly high, it shows excellent thermal resistance compared to OPC. Therefore, based on the test results, it can be concluded that in the presence of a chemical activator, the aforementioned pozzolans can be used as an alternative material for cement. View Full-Text
Keywords: slag; palm oil fuel ash; rice husk ash; alkaline activator; alkali activated binder slag; palm oil fuel ash; rice husk ash; alkaline activator; alkali activated binder

Figure 1a

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. (CC BY 4.0).

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MDPI and ACS Style

Karim, M.R.; Hossain, M.M.; Khan, M.N.N.; Zain, M.F.M.; Jamil, M.; Lai, F.C. On the Utilization of Pozzolanic Wastes as an Alternative Resource of Cement. Materials 2014, 7, 7809-7827.

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