Water diffusion and microstructure of hydrated cement pastes

Glover, G. M.; Raask, E.

doi:10.1007/bf02474874

Cited by 7 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7. This double-slope shape was also observed previously for the same temperature range under diffusion for ordinary Portland cement (cured for 28 and 90 days) and aluminous cement (Glover and Raask 1972). In addition, Drouet et al (2015) described the temperature dependency of permeability as a non-Arrhenius behavior.…”

Section: Activation Energy Of the Rate Of Exchange Between Large And Fine Poressupporting

confidence: 85%

Temperature-Dependent Water Redistribution from Large Pores to Fine Pores after Water Uptake in Hardened Cement Paste

Kiran

Samouh

Igarashi

et al. 2020

ACT

View full text Add to dashboard Cite

During sorption, the microstructural evolutions of two different cement pastes (with water-to-cement ratios of 0.40 and 0.55) are studied via proton-nuclear-magnetic-resonance relaxometry. The water uptake test is performed for samples dried at 105°C under three different temperatures of 20°C, 40°C, and 60°C for the first twenty-six days of sorption. It is observed that the water went first to the larger pores before migrating to the finest ones. This behavior is accelerated with increasing temperature. The rate of water exchange between fine and large pores is estimated and found to increase with temperature for both studied mixtures. The activation energy corresponding to this water movement is calculated and found to be higher for the lowest water-to-cement ratio, owing its finer microstructure. Finally, the activation energy related to the local water transport in re-distribution from large pores to fine pores is calculated and found to be inferior to the experimental results, which can be explained by the dynamic microstructure not being considered in the classical theories. Recently, based on the proton nuclear magnetic resonance ( 1 H-NMR) relaxometry technique, the dynamic

show abstract

Section: Activation Energy Of the Rate Of Exchange Between Large And Fine Poressupporting

confidence: 85%

Temperature-Dependent Water Redistribution from Large Pores to Fine Pores after Water Uptake in Hardened Cement Paste

Kiran

Samouh

Igarashi

et al. 2020

ACT

View full text Add to dashboard Cite

show abstract

“…In so doing, the resulting moisture diffusivity D was found to increase with temperature. Glover and Raask [4] showed that the moisture diffusivity of a Portland cement paste (water-to-cement ratio w/c = 0.28) was multiplied by 11 to 15 between 30 and 70°C whereas Wong et al [7] obtained a factor 6 to 8 between 20 and 40°C for three concretes (Portland cement, w/c = 0.4, 0.5 and 0.6). In the same way Powers [5] measured the permeability of Portland cement pastes (w/c from 0.5 to 0.8) between 0 and 27°C using water.…”

Section: Introductionmentioning

confidence: 98%

“…Experiments performed on cementitious materials have shown that the higher the temperature, the faster the water transport [2][3][4][5][6][7][8][9]. Several authors used the diffusion equation to describe isothermal drying experiments.…”

Section: Introductionmentioning

confidence: 99%

Temperature influence on water transport in hardened cement pastes

Drouet

Poyet

Torrenti³

2015

Cement and Concrete Research

View full text Add to dashboard Cite

International audienceDescribing water transport in concrete is an important issue for the durability assessment of radioactive wastemanagement reinforced concrete structures. Due to the waste thermal output such structures would besubmitted to moderate temperatures (up to 80 °C). We have then studied the influence of temperature onwater transport within hardened cement pastes of four different formulations. Using a simplified approach(describing only the permeation of liquid water) we characterized the properties needed to describe watertransport (up to 80 °C) using dedicated experiments. For each hardened cement paste the results are presentedand discussed

show abstract

“…Because the water content impacts both CO 2 diffusion and the chemical reactions, it is impossible to predict the influence of water retention modifications induced by temperature on carbonation. Moreover, temperature also impacts water transport; drying is faster when the temperature is increased [32][33][34][35][36]. From this perspective, the interaction between carbonation and water transport appears to be essential and even more important than at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%