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Alkaline Cements of Waste Glass and Metakaolin, Strength as a Function of the Chemical Composition

Published online by Cambridge University Press:  11 November 2013

D. E. Ortega-Zavala ,
Alexander Gorokhovsky  and
J. I. Escalante-García
D. E. Ortega-Zavala
Affiliation:
Centro de Investigación y de Estudios Avanzados del IPN (Unidad Saltillo), Av. Industria Metalúrgica No. 1062 Parque Industrial, Ramos Arizpe, Coahuila, C.P. 25900, México, Tel.+52 (844)438-9600 fax 4389610, Email: esmeralda.ortega@cinvestav.edu.mxivan.escalante@cinvestav.edu.mx
Alexander Gorokhovsky
Affiliation:
Department of Chemistry, Saratov State Technical University, 77 Politekhnicheskaya str., Saratov, 410054, Russia.
J. I. Escalante-García
Affiliation:
Centro de Investigación y de Estudios Avanzados del IPN (Unidad Saltillo), Av. Industria Metalúrgica No. 1062 Parque Industrial, Ramos Arizpe, Coahuila, C.P. 25900, México, Tel.+52 (844)438-9600 fax 4389610, Email: esmeralda.ortega@cinvestav.edu.mxivan.escalante@cinvestav.edu.mx
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Abstract

Pastes of waste glass (WG) and metakaolin (MK) were prepared by chemical activation with sodium silicate solutions of modulus Ms = 0.5, 0.75, 1 and 1.25 adjusted with sodium hydroxide. An experimental design was carried out using the Taguchi method. The compressive strength (CS) was followed for up to 120 days and then 4 selected formulations of the higher CS were further characterized by X-ray diffraction and scanning electron microscopy. The results showed that the CS depends on the experimental conditions of %WG, %Na2O and Ms and showed a maximum of 70 MPa after 120 days for the paste with 100%WG (%wt.), 8% Na2O and Ms=1.25; while a Portland cement specimen cured at 20°C reached 43MPa. The WG is more reactive than the MK under less alkaline conditions. The features of the microstructures varied notably with the %WG; however all showed relative dense matrices of reaction products, in agreement with the CS attained.

Keywords

compositewaste managementadditives
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1612: Symposium 4B – Durability of Concrete Structures , 2013 , imrc2013-s4b-p033
Copyright
Copyright © Materials Research Society 2013 

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