TY - GEN
T1 - Gas diffusivity test method development
T2 - 12th fib International PhD Symposium in Civil Engineering, 2018
AU - Boumaaza, Mouna
AU - Huet, Bruno
AU - Turcry, Philippe
AU - Gehlen, Christoph
AU - Ait-Mokhtar, Abdel Karim
AU - Heinz, Detlef
N1 - Publisher Copyright:
© fédération internationale du béton (fib).
PY - 2018
Y1 - 2018
N2 - The nature and structure of the concrete’s pore system largely determine its durability. For example carbon dioxide gas transport through the pore system and its subsequent interaction with cement hydrates at the steel/concrete interface (SCI) is considered to be a big threat to reinforced-concrete structures. In a real environment, gas transport through cementitious materials is achieved by a diffusion process. Therefore, the determination of the gas diffusion coefficient of cementitious materials is necessary for the evaluation of their transport properties and the expectable service life. In the present study we describe a new technique for the determination of the gaseous oxygen diffusion coefficient of cement paste and concrete samples. For paste samples, we examine the influence of the degree of water saturation, hydration duration, and composition (samples with 10% silica fume and 50% slag are also tested) on the effective-diffusion coefficient of gaseous oxygen. As for concrete samples, we examine the relative influence of the specimen thickness on gas diffusivity. Oxygen-effective diffusion coefficient (De,O2) is found to be greatly influenced by the degree of water saturation of cement paste samples.
AB - The nature and structure of the concrete’s pore system largely determine its durability. For example carbon dioxide gas transport through the pore system and its subsequent interaction with cement hydrates at the steel/concrete interface (SCI) is considered to be a big threat to reinforced-concrete structures. In a real environment, gas transport through cementitious materials is achieved by a diffusion process. Therefore, the determination of the gas diffusion coefficient of cementitious materials is necessary for the evaluation of their transport properties and the expectable service life. In the present study we describe a new technique for the determination of the gaseous oxygen diffusion coefficient of cement paste and concrete samples. For paste samples, we examine the influence of the degree of water saturation, hydration duration, and composition (samples with 10% silica fume and 50% slag are also tested) on the effective-diffusion coefficient of gaseous oxygen. As for concrete samples, we examine the relative influence of the specimen thickness on gas diffusivity. Oxygen-effective diffusion coefficient (De,O2) is found to be greatly influenced by the degree of water saturation of cement paste samples.
UR - http://www.scopus.com/inward/record.url?scp=85134806255&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:85134806255
SN - 9788001064016
T3 - fib Symposium
SP - 1087
EP - 1094
BT - Proceedings of the 12th fib International PhD Symposium in Civil Engineering, 2018
A2 - Kohoutkova, Alena
A2 - Bily, Petr
A2 - Vitek, Jan L.
A2 - Frantova, Michaela
PB - fib. The International Federation for Structural Concrete
Y2 - 29 August 2018 through 31 August 2018
ER -