Porous structure and mechanical strength of cement-lime pastes during setting

Fourmentin, M.; Faure, Paméla; Gauffinet, Sandrine; Peter, Ulrike; Lesueur, Didier; Daviller, D.; Ovarlez, Guillaume; Coussot, Philippe

doi:10.1016/j.cemconres.2015.06.009

Cited by 30 publications

(24 citation statements)

References 22 publications

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“…For all pastes, we observe a peak at low relaxation times, below 100 ms, and one or two smaller peaks between 100 and 1000 ms (see Figure 3). The first peak is in a position similar to the main peak that can be observed for the pastes alone [27]. Additional peaks of much smaller amplitude can also be observed at much shorter relaxation times [25] but these will be neglected as they correspond to negligible amounts of water.…”

Section: Nmr Measurementssupporting

confidence: 48%

“…The composition and main physical characteristics of cement are described in [27]. In particular, its specific surface area was found to be 1.3 m 2 /g.…”

Section: Cement Pastementioning

confidence: 99%

“…We also used a standard hydrated lime CL90 S (according to EN 459-1) provided by Lhoist (see characteristics in [27]). This material is made of particles in the range 1 µm to 10 m with an average particle size around 4 m.…”

Section: Other Pastesmentioning

confidence: 99%

“…In particular, its specific surface area was found to be 1.3 m 2 /g. The particle size distribution was measured by light scattering on a Coulter LS 13320 in methanol giving a particle size distribution spreading from 1 µm to 50 m (see [27]) with a median size around 10 m. The cement paste was prepared by pouring the anhydrous cement in water and hand mixing during 1 min.…”

Section: Cement Pastementioning

confidence: 99%

“…On the other hand 1 H NMR (Nuclear Magnetic Resonance) relaxometry provides the distribution of (NMR) relaxation times of hydrogen-bearing fluid molecules embedded in a sample volume that are known to depend on pore size, surface chemistry and saturation state. So far, this technique has mainly been used to study the pore characteristics of cement [21], plaster [22] or model porous systems [23][24] or more globally the structure evolution of cement or lime pastes [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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NMR observation of water transfer between a cement paste and a porous medium

Fourmentin

Faure

Rodts

et al. 2017

Cement and Concrete Research

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We show that it is possible to follow the liquid transfer between a cement paste and a porous medium in contact with it, by analyzing the evolution of the distribution of 1 H NMR relaxation times. This in particular makes it possible to see that whatever the initial water fraction in the paste, a porous medium with sufficiently small pores can rapidly extract a significant amount of water from this paste. Afterwards, during the hydration process, the cement paste progressively gets water back from this porous medium. The amount of water thus extracted by the paste finally appears to just compensate the volume loss due to water consumption by the hydration process.

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Section: Nmr Measurementssupporting

confidence: 48%

“…The composition and main physical characteristics of cement are described in [27]. In particular, its specific surface area was found to be 1.3 m 2 /g.…”

Section: Cement Pastementioning

confidence: 99%

Section: Other Pastesmentioning

confidence: 99%

Section: Cement Pastementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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NMR observation of water transfer between a cement paste and a porous medium

Fourmentin

Faure

Rodts

et al. 2017

Cement and Concrete Research

Self Cite

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Early hydration process of the cement–lime system

Zhou

Yang

et al. 2018

ce papers

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Autoclaved aerated concrete is a widely used wall material, of which the cementitious materials are cement and lime. In this study, hydration process of the cement-lime system and the influence of initial temperature, water to lime and cement ratio (W/LC), and lime to cement ratio (L/C) on the cement-lime system heat release process were investigated during the first 2 h of hydration. The results indicate that the hydration process of the cement-lime system can be divided into three stages -initial stage, middle stage, and final stage. A prolonged hydration time can be observed with a lower initial temperature, higher W/LC, and lower L/C. The hydration time doubles for every 10 • C reduction in initial temperature. A lower W/LC moves the induction and acceleration periods forward but decreases hydration rates if without the effect of the heat released. There might be a critical point of CaO dosage in the cement-CaO system that can change the hydration mechanism.The investigations uncover regulations and effect factors of the hydration process of the cementlime system which can help to improve the quantity of autoclaved aerated concrete. K E Y W O R D Sautoclaved aerated concrete, cement-lime system, chemical reaction rate, hydration time

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