Accelerated carbonation of ordinary Portland cement paste and its effects on microstructure and transport properties

Conference paper (2021)

Authors

C. Romero Rodriguez Materials and Environment -

R. Ye Politecnico di Torino

Aikaterini Varveri Pavement Engineering -

E. Rossi Materials and Environment -

Giovanni Anglani Politecnico di Torino

Paola Antonaci Politecnico di Torino

E. Schlangen Materials and Environment -

B. Šavija Materials and Environment -

Research Group

Materials and Environment () (TU Delft)

Carbonation Blended cement Transport properties cement Dual X-ray microcomputer tomography DVS

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Published Date

2021

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

Coupling of carbonation and chlorides ingress mechanisms is very common in concrete under certain exposure conditions such as coastal environments. The aggravation/ mitigation of corrosion by the existence of carbonation lies on the fact that microstructural changes due to carbonation result in changes on the transport properties of the material. In this study we investigate and quantify evolving transport properties of ordinary Portland cement paste, such as porosity, tortuosity and intrinsic permeability. Dual X-ray micro computed tomography (micro CT) is used for the quantification of porosity. Furthermore Dynamic Vapour Sorption (DVS) measurements are carried out to resolve water retention and relative permeability curves. The authors expect to provide insights into the mechanisms of accelerated carbonation in both types of cement paste, as well as data for input and validation of numerical and analytical models on this degradation phenomenon.

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