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effects of zeolite and silica fumes on the mechanical and leaching performance of a cementitious system containing metal nitrates

Ouki, SK and Gervais, C (2002) effects of zeolite and silica fumes on the mechanical and leaching performance of a cementitious system containing metal nitrates In: Innovations and developments in concrete materials and construction, 2002-09-09 - 2002-09-11, Scotland, UK.

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Abstract

The objective of this paper is to examine the effect of Cr, Mn, Pb, and Zn, on the mechanical and leaching characteristics of cement-based materials. Three different matrices (i) Portland cement, (ii) Portland cement and silica fume, and (iii) Portland cement and natural zeolites, were investigated. The results of both mechanical and leaching tests showed the importance of the contaminant/matrix pair considered. The setting time was reduced in presence of chromium and delayed in presence of manganese, lead and zinc. Although the early strength development was quite affected in presence of all four contaminants, the long-term strength was comparable to the controls. From 56 days of curing onwards, partial replacement of cement by silica fume was proven to increase the strength of all materials. Conversely, zeolite replacement reduced strength compared to the cement matrix, which was attributed to the high water/binder ratio used. The increased strength and reduced ANC observed in presence of silica fume, are both due to the pozzolanic reaction, which consumes portlandite to form CSH.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Authors :
NameEmailORCID
Ouki, SKs.ouki@surrey.ac.ukUNSPECIFIED
Gervais, CUNSPECIFIEDUNSPECIFIED
Date : 2002
Contributors :
ContributionNameEmailORCID
UNSPECIFIEDDhir, RUNSPECIFIEDUNSPECIFIED
UNSPECIFIEDHewlett, PUNSPECIFIEDUNSPECIFIED
UNSPECIFIEDCsetenyi, LUNSPECIFIEDUNSPECIFIED
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 11:46
Last Modified : 17 May 2017 14:58
URI: http://epubs.surrey.ac.uk/id/eprint/832637

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