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Fresh Properties of Mortar made with Pozzolanic Cement and Water Reducers

Published online by Cambridge University Press:  10 December 2012

María E. Sosa ,
Yury A. Villagrán-Zaccardi ,
Claudio J. Zega  and
P.Peralta Juan
María E. Sosa
Affiliation:
LEMIT, 52 entre 121 y 122, 1900 La Plata, Argentina
Yury A. Villagrán-Zaccardi
Affiliation:
LEMIT, 52 entre 121 y 122, 1900 La Plata, Argentina CONICET, Argentina
Claudio J. Zega
Affiliation:
LEMIT, 52 entre 121 y 122, 1900 La Plata, Argentina CONICET, Argentina
P.Peralta Juan
Affiliation:
LEMIT, 52 entre 121 y 122, 1900 La Plata, Argentina
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Abstract

Natural pozzolans are supplementary cementitious materials (SCMs) that may be used to improve the properties of mortar and concrete, through the formation of additional hydration products by pozzolanic action. Water reducers (WR) play a main role in high performance concrete in terms of durability, strength and surface finishing. A first optimization of constituent proportions in paste and/or mortar is convenient to assess the compatibility between the WR and the cementitious materials. The compatibility between cement and WR may be affected by SCMs, as they can also interact with the molecules of the admixture. However, the practical implication may be variable. This paper deals with the influence of different types and dosages of WRs in mortars made with pozzolanic Portland cement. Both medium and high ranges WRs have been used. Mortar fluidity has been tested by the spread and the slump tests. Results show different fluidizing capacities of WRs, among which polycarboxylate-based WR was the most compatible with the pozzolanic cement.

Keywords

compositeadditiveswater
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1488: Symposium 7B – Concrete with Smart Additives and Supplementary Cementitious Materials , 2012 , imrc12-1488-7b-004
Copyright
Copyright © Materials Research Society 2012 

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