Moisture transport and sorption in cement based materials containing slag or silica fume

Olsson, Nilla; Nilsson, Lars; Åhs, Magnus; Baroghel-Bouny, Véronique

doi:10.1016/j.cemconres.2018.01.018

Cited by 29 publications

(16 citation statements)

References 23 publications

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“…However, the increase in moisture content of the blended pastes mainly occurs at RH above 40 % as the w/b increases. Olsson et al [43] reported a similar phenomenon in well-hydrated (water curing for 4 years) slag blended pastes.…”

Section: Water Vapour Desorption Isothermsmentioning

confidence: 69%

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: Water Vapour Desorption Isothermsmentioning

confidence: 69%

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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“…The results from the cup measurements surprisingly well match the results from the can method; for the concrete with the lower vct, this is very good, even though the RH intervals are not the same. Olsson et al (2018) [7] and Hedenblad (1993) [2] showed that the moisture dependency is very small when the w/c is about 0.4 or less. This indicates that the can method can be a method to quickly get an idea of a new concrete's moisture transport properties.…”

Section: Resultsmentioning

confidence: 99%

“…The moisture content difference C0 -C1 (kg/m 3 ) in equations ( 2)-(4) can then be expressed as (7) Inserted into equation ( 4) gives (8) The moisture transport coefficient Gv then follows from insertion into equation (5) (9) rearranged to (10) This is the equation to be used.…”

Section: Theorymentioning

confidence: 99%

The tin can method for determining moisture transport properties of concrete

Nilsson

Bergström²

2020

E3S Web Conf.

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Traditional methods for measuring moisture transport properties of concrete are time-consuming, especially since thick specimens are required, and steady-state methods are preferred. Non-steady state methods may be an alternative but the conditioning to uniform initial conditions is extremely difficult. The tin can method is, however, a good alternative under certain conditions and for certain concretes. Concrete is poured into a tin can and sealed cured in this way for at least a month. The can is opened, and the concrete is dried in a constant climate. Weight changes are recorded for several weeks. From these weight changes, the initial RH at start of drying, the drying climate and the desorption isotherm, the moisture transport coefficient or the moisture diffusion resistance factor are derived. The paper describes the theory behind the method and the unique conditions available for certain concretes that makes the method applicable. Examples of measurements are shown for a number of concretes and verification is done with the cup method on the very same concretes, with excellent results.

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“…The addition of supplemental cementitious materials such as Fa, GbfS and SF could improve the mechanical properties and durability of cement-based materials [27][28][29]. In Turkey, there are about 7500 million tons of perlite deposits, and this represents the 2/3 of it exists all over the world [30].…”

Section: Scope Of the Problemmentioning

confidence: 99%

“…The increase of the combined water content is principally attributed to the activation effect of the nano silica from the PT, and moreover to the pozzolanic activity of PT with the produced free lime or Ca (OH) 2 due to the normal hydration process of the cement forming additional CSH and/or CAH [5,7,18,20,21,26]. The decrease of combined water contents is mainly attributed to the aggressive attack of SO 4 -2 ions that often spoiled the produced hydration products [28,29,[40][41][42][43]. The optimum cement batch was Pp4 containing 20% PT because it exhibited the highest results of combined water contents at…”

Section: Combined Water Contentmentioning

confidence: 99%

Utilization of Nano-Grain Size Particles of Natural Perlite Rock in Blended Cement-Part II: Durability Against Sulfate Attack

Hhm

2020

RDMS

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The chemical resistance or durability of Portland cement pastes (PS0) incorporating natural Perlite rock (PT) against the aggressive attack of 4% MgSO4 solution up to 12 months were investigated. Results showed that water of consistency and setting times (initial and final) are elongated. The compressive strength slightly improved during the early ages of immersion only up to three months with the blank cement batch (Pp0), but up to 4, 5, 6 and 7 months with cement batches (Pp1-Pp4) containing 5, 10, 15 and 20wt%PT, respectively and then decreased. Thereafter, certain deleterious or detrimental reactions started till forming high levels of ettringite and/or gypsum. These new phases are responsible for the decrease of compressive strength. Both combined water and total sulfate contents increased with time of immersion up to 12 months but decreased with PT content if compared with those of the blank (Pp0). The blank cement pastes (Pp0) recorded the highest values of total sulfate content, i.e. it is very sensitive to SO42-ions. At the end of the 12th month of immersion, the SO42-ions only precipitated on the external and lateral surfaces of the hardened cement pastes, and some horizontal minor cracks and little deformation could be seen on the edges of specimens with samples containing PT, whilst large swelling was noted with cement pastes of the blank (Pp0).

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Moisture transport and sorption in cement based materials containing slag or silica fume

Cited by 29 publications

References 23 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

The tin can method for determining moisture transport properties of concrete

Utilization of Nano-Grain Size Particles of Natural Perlite Rock in Blended Cement-Part II: Durability Against Sulfate Attack

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