Wick action in mature mortars with binary cements containing slag or silica fume – The relation between chloride and moisture transport properties under non-saturated conditions

Olsson, Nilla; Wahid, Fatmawati Abdul; Nilsson, Lars; Thiel, Charlotte; Wong, H.S.; Baroghel-Bouny, Véronique

doi:10.1016/j.cemconres.2018.06.006

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…The difference between binary and CEM I hcp becomes larger at higher w/b. This reveals a more evident refinement effect from SL and FA, resulting in a larger reducing effect on the moisture and chloride transport [7,35,36,43]. The volume of open LGP pores (3.3-12.3 nm) is increased by the blending of SL and FA, and this effect is significant on hcp with a w/b of 0.35.…”

Section: Comparison Of Pore Size From Dvs and Nsmentioning

confidence: 90%

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Using water vapour and N2 isotherms to unveil effects of SCMs on nanopores and evaluate hydration degree

Huang

Tang

Wadsö

et al. 2023

Cement and Concrete Research

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Section: Comparison Of Pore Size From Dvs and Nsmentioning

confidence: 90%

“…It is well known that SCMs influence the properties, e.g. the mass transport in cement-based materials [6,7]. However, there are still many gaps in correlating the microstructure of hardened cement-based material with its transport properties, especially for mixtures with the addition of SCMs.…”

Section: Introductionmentioning

confidence: 99%

Using water vapour and N2 isotherms to unveil effects of SCMs on nanopores and evaluate hydration degree

Huang

Tang

Wadsö

et al. 2023

Cement and Concrete Research

Self Cite

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“…A considerable number of scientific and engineering studies have been carried out over the past decades. The beneficial effects of slag utilization, particularly for chloride-laden environments, have always been a hot topic of research [5][6][7][8][9][10][11][12][13]. The role of slag in cementitious systems is affected by a variety of factors, such as chemical composition (CaO, MgO, Al 2 O 3 , and SiO 2 ), glass content, particle size distribution, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Field concretes are normally unsaturated, which plays a crucial role in long-term chloride transport. This issue has been highlighted and elaborated on in recent reports [10,11,18]. Based on a comprehensive literature survey, research on chloride penetration and transport mechanisms of unsaturated cementitious systems incorporating ultrafine slag powders are far from adequate.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ultrafine Blast Furnace Slag on the Microstructure and Chloride Transport in Cementitious Systems under Cyclic Drying–Wetting Conditions

Jiang

et al. 2022

Applied Sciences

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This paper presents experimental investigations into the effects of ultrafine blast furnace slag on microstructure improvements against chloride penetration in saturated and unsaturated cementitious systems exposed to cyclic drying–wetting conditions. The hydration kinetics of ultrafine slag powders and pore solution chemistry in slag-blended cementitious systems at different ages, together with the main hydration products and pore structure characteristics, were determined. The chloride profiles accounting for different slag contents and drying–wetting cycles were measured. The results reveal that the reactivity of ultrafine slag can be well described with Avrami’s equation. The dilution effect of the slag predominated the pore solution chemistry, and the pH value decreased with a higher inclusion of slag. An optimal inclusion of 65% slag by mass of the binder corresponding to the finest pore structure and highest hydrotalcite content was found, which provides a reasonable basis for the slow chloride diffusion and high chloride binding. Under drying–wetting exposure, the specimen with a lower saturation exhibited a higher chloride transport caused by capillary absorption in the skin layer. The chloride transport tended to be diffusion controlled after sufficient drying–wetting cycles.

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“…Micro X-ray fluorescence (µXRF) is a non-destructive microscopy technique which allows elemental mapping of multiphase materials at microscale. This technique has been used to study chloride transport (Davis et al, 2011, Alzyoud et al, 2016, Khanzadeh Moradllo et al, 2017, Olsson et al, 2018, Maraghechi et al, 2018 and carbonation (De Weerdt et al, 2019) in mortars and concretes. µXRF has higher spatial resolution than flatbed scanners or µCT.…”

Section: Introductionmentioning

confidence: 99%

Analysis of cement paste and aggregate content of concrete using micro X-ray fluorescence

Yio

Wahid

et al. 2022

Magazine of Concrete Research

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A new method for determining the cement paste, fine aggregate and coarse aggregate content of hardened concrete using micro X-ray fluorescence (μXRF) is presented. The method involves mathematical and morphological operations to extract aggregate particles from large-area (100 x 50 mm2) composite element maps acquired with μXRF. The method was tested on five concretes containing different types of aggregates including gravel, limestone, siliceous sand, and sintered lightweight aggregates. The results were compared against point count analysis and data from the actual mix design. The average errors in relation to the mix design for the measured fine aggregate, coarse aggregate, total aggregate, cement paste contents and fine/coarse aggregate ratio were 12%, 12%, 3.4%, 10%, and 27% respectively. All measured values fell within ±4% of those point-counted. An image size of > 2000 mm2 (at least five times maximum aggregate size) was found to be required to obtain representative results. The advantages and limitations of the proposed method are discussed.

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Wick action in mature mortars with binary cements containing slag or silica fume – The relation between chloride and moisture transport properties under non-saturated conditions

Cited by 12 publications

References 12 publications

Using water vapour and N2 isotherms to unveil effects of SCMs on nanopores and evaluate hydration degree

Using water vapour and N2 isotherms to unveil effects of SCMs on nanopores and evaluate hydration degree

Effects of Ultrafine Blast Furnace Slag on the Microstructure and Chloride Transport in Cementitious Systems under Cyclic Drying–Wetting Conditions

Analysis of cement paste and aggregate content of concrete using micro X-ray fluorescence

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