Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Influence of the chemical and mineralogical composition on the reactivity of volcanic ashes during alkali activation
Ceramics International, Volume 40, No. 1 PART A, Year 2014
Notification
URL copied to clipboard!
Description
The influence of chemical and mineralogical compositions on alkali activation of four natural volcanic ashes was investigated. NaOH was used as the sole alkaline activator. The reactivity of the systems was studied with Differential Scanning Calorimetry. The X-ray spectra of reacted materials showed a mixture of amorphous and crystalline phases. The SEM micrographs showed that the dissolution of larger particles is incomplete while smaller particles dissolved in the activating solution forming the glassy aluminosilicate matrix. The infrared spectra showed a broad absorbance at 820-1250 cm-1and 480-600 cm-1 assigned to internal vibration of Si3O3Si and Si3O3Al in both raw volcanic ash and resulting inorganic polymers. The reactivity of the volcanic ashes was found to correlate with their amorphous fraction. The dry compressive strength of synthesized products from all the ashes were in the range 14-63 MPa, suggesting their possible utilization as building materials. However, the strength was found to decrease (1-28 MPa) after specimens' immersion overnight in water, but was partly or totally recovered after overnight drying at 90 C. © 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Authors & Co-Authors
Lemougna, Patrick Ninla
Cameroon, Yaounde
Université de Yaoundé I
Chinje Melo, Uphie
Cameroon, Yaounde
Université de Yaoundé I
Delplancke, M. P.
Belgium, Brussels
Université Libre de Bruxelles
Rahier, Hubert
Belgium, Brussels
Vrije Universiteit Brussel
Statistics
Citations: 88
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.ceramint.2013.06.072
ISSN:
02728842
Research Areas
Environmental