Experimental investigation and numerical modeling of chloride penetration and calcium dissolution in saturated concrete

Sugiyama, Takafumi; Ritthichauy, Worapatt; Tsuji, Yukikazu

doi:10.1016/j.cemconres.2007.08.027

Cited by 40 publications

(15 citation statements)

References 15 publications

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“…We can conclude that L cement is more sensitive to pH and EC values of plasticizer, than B cement. This fact attests that these two cements need attentive choosing of plasticizers and it is confirmed by researches [24,25,26,27]. It is possible to generalize that the observed temperature, viscosity and EC changes tendencies in pastes basically reflect in calorimetric tests.…”

Section: Test Resultssupporting

confidence: 54%

Influence of Plasticizer Amount on Rheological and Hydration Properties of CEM II Type Portland Cements

Šeputytė-Jucikė

Pundienė

Kičaitė

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Section: Test Resultssupporting

confidence: 54%

Influence of Plasticizer Amount on Rheological and Hydration Properties of CEM II Type Portland Cements

Šeputytė-Jucikė

Pundienė

Kičaitė

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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“…These tests show that limestone cement is more sensitive to pH and EC values of plasticizer, than the slag cement. The fact that these two cements need careful selection of additives is confirmed by [4,6,[10][11][12][36][37][38] tests.…”

Section: Resultsmentioning

confidence: 99%

Impact of different types of plasticizing admixtures on the rheological properties and hydration of blended cements

Pundienė

Kičaitė

Pranckevičienė

2015

J Therm Anal Calorim

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Portland cement manufacturing significantly contributes to CO 2 emissions into the atmosphere. In order to reduce CO 2 emissions, limestone and slag mineral admixtures are most prospective both technologically and economically in cement production. For such cements, it is important to select a certain type and amount of plasticizer and evaluate what plasticizers influence the heat released during hydration. In order to achieve the objectives of research, viscosity, conductivity, and DSC analyses of cement pastes with A and B plasticizers were performed. This study analyzes the effect of polycarboxylate ester (A) and modified lignosulfonate (B) plasticizers amount on rheological properties and hydration processes of the limestone and slag cement pastes. The use of A additive in contrast to B additive has a long-term effect on viscosity of both cement pastes and is less sensitive to mineral composition. Optimal A additive amount in case of limestone cement is 1.25 % and in case of slag cement is 0.3 %. In limestone cement additive A reduces total heat value by 6 % and additive B by 15 % after 48 h of hydration. In slag cement additive A increases total heat value by 4 % and additive B by 2 % after 48 h of hydration. Exothermal profiles show that in limestone cement additive A extends the EXO maximum time by 25 % and additive B by 40 % in samples after 24 h of hydration. In slag cement additive A extends the EXO maximum time by 37 % and additive B by 25 % in samples after the same time of hydration.

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“…The pore structure of cement-based materials is of primary importance for understanding and modeling the transport phenomena that influences the durability performance of these materials [1][2]. It is well understood that a typical characteristic of any material transport in such complex porous media is that the actual path followed by the transported material is very complicated or tortuous even in the microscopic scale.…”

Section: Introductionmentioning

confidence: 99%

Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography

Promentilla

Sugiyama

Hitomi

et al. 2009

Cement and Concrete Research

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242

108

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Tortuosity, as being influenced by the 3D pore micro-geometry, is an important physical quantity to understand better the effect of pore structure on transport properties of cement-based materials. This study attempts to evaluate directly this pore structure-transport parameter from the microtomographic images at spatial resolution of 0.5 µm. This resolution, is by far, to our knowledge, the highest resolution reported for 3D non-invasive imaging of hardened cement pastes. The results show the feasibility of using synchrotron microtomography coupled with 3D image analysis and random walk simulation to measure the diffusion tortuosity that has a direct bearing on transport properties. The tortuosity associated with the percolating pore space seems to reflect the pore morphology that mainly controls the transport properties in young cement pastes; thus, explaining the rough agreement of the results with the computer model or experimental evidence.

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Experimental investigation and numerical modeling of chloride penetration and calcium dissolution in saturated concrete

Cited by 40 publications

References 15 publications

Influence of Plasticizer Amount on Rheological and Hydration Properties of CEM II Type Portland Cements

Influence of Plasticizer Amount on Rheological and Hydration Properties of CEM II Type Portland Cements

Impact of different types of plasticizing admixtures on the rheological properties and hydration of blended cements

Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography

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