Characterisation and reduction by nano-additions of the effect of Ca-leaching in cement pastes

Title: Characterisation and reduction by nano-additions of the effect of Ca-leaching in cement pastes
Author(s): Juan José Gaitero, Yolanda Sáez de Ibarra, Edurne Erkizia, Igor Campillo
Paper category : conference
Book title: NICOM 2: 2nd International Symposium on Nanotechnology in Construction
Editor(s): Y. de Miguel, A. Porro and P.J.M. Bartos
Print-ISBN: 2-912143-87-X
e-ISBN: 2912143888
Publisher: RILEM Publications SARL
Publication year: 2006
Pages: 143 - 150
Total Pages: 8
Nb references: 11
Language: English

Abstract: The calcium leaching of the cement hydrated matrix is of vital importance for constructions like water containers, dams, bridges, etc which have to be in contact with water during their lifetime. The aim of this work is the study of the reduction of such a negative phenomenon by the addition of silica nanoparticles. Several characterisation techniques such as 29Si MAS NMR, X-ray diffraction, mercury intrusion porosimetry and EDX-microanalysis have been used to evaluate the effect of the nanoparticles in the cement matrix nanostructure and in their impact on the evolution of the Ca leaching throughout time. Subsequent analysis of the results indicates that silica nanoparticles can reduce the Ca-leaching both decreasing the amount of portlandite in the matrix and controlling the degradation rate of the C-S-H gel.

Online publication: 2005-11-17
Publication type : full_text
Public price (Euros): 0.00