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Micro-hydration, pore connectivity and durability of cementitious materials

Koenders, E. A. B. and Ukrainczyk, N. and Hansen, W. (2012):
Micro-hydration, pore connectivity and durability of cementitious materials.
Rilem Publications s.a.r.l., In: Second International Conference on Microstructural-related Durability of Cementitious Composites, RILEM, Amsterdam, The Netherlands, 11-13 April 2012, ISBN 9782351581,
[Online-Edition: http://resolver.tudelft.nl/uuid:09a3c297-a1b0-4192-98b1-69ab...],
[Conference or Workshop Item]

Abstract

Latest developments in Hymostruc enable the possibility to evaluate the pore connectivity of an evolving microstructure while also considering the contribution of the ITZ and air voids and to examine the influence on frost durability. The numerical model is used to visualize this phenomenon and to show the contribution of both the pores and the ITZs to the continuation of capillary pore. Once the capillary pores are blocked by ongoing hydration the transport of harmful dilutions are restricted to move into the microstructure. However, distinction is made between the pore connectivity as developed in the bulk paste and the connectivity as developed by connected ITZs. A blockage of the capillary pores (pore discontinuity) as well as a blockage of the ITZs contribute to an increased depercolation of the cementitious microstructure and improve the microstructural performance. The surface durability of freeze/thaw resistance of pavements and chloride ingress is evaluated in view of the pore continuity modelling approach.

Item Type: Conference or Workshop Item
Erschienen: 2012
Creators: Koenders, E. A. B. and Ukrainczyk, N. and Hansen, W.
Title: Micro-hydration, pore connectivity and durability of cementitious materials
Language: English
Abstract:

Latest developments in Hymostruc enable the possibility to evaluate the pore connectivity of an evolving microstructure while also considering the contribution of the ITZ and air voids and to examine the influence on frost durability. The numerical model is used to visualize this phenomenon and to show the contribution of both the pores and the ITZs to the continuation of capillary pore. Once the capillary pores are blocked by ongoing hydration the transport of harmful dilutions are restricted to move into the microstructure. However, distinction is made between the pore connectivity as developed in the bulk paste and the connectivity as developed by connected ITZs. A blockage of the capillary pores (pore discontinuity) as well as a blockage of the ITZs contribute to an increased depercolation of the cementitious microstructure and improve the microstructural performance. The surface durability of freeze/thaw resistance of pavements and chloride ingress is evaluated in view of the pore continuity modelling approach.

Publisher: Rilem Publications s.a.r.l.
ISBN: 9782351581
Uncontrolled Keywords: cement hydration, microstructure, modeling
Divisions: 13 Department of Civil and Environmental Engineering Sciences
13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials
Event Title: Second International Conference on Microstructural-related Durability of Cementitious Composites, RILEM
Event Location: Amsterdam, The Netherlands
Event Dates: 11-13 April 2012
Date Deposited: 08 Jun 2015 14:58
Official URL: http://resolver.tudelft.nl/uuid:09a3c297-a1b0-4192-98b1-69ab...
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