Cement and concrete research, Vol. 40 N° 1. Cement and concrete research - Janvier 2010
| Titre : | Cement and concrete research, Vol. 40 N° 1. Cement and concrete research - Janvier 2010 |
| Type de document : | Bulletin |
| Paru le : | 09/03/2010 |
Dépouillements
Article : texte imprimé
E. Gallucci, Auteur ;
P. Mathur, Auteur ;
K. Scrivener, Auteur
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An important microstructural aspect of the early hydration of Portland cement (PC) is the formation of a shell of hydration products around cement grains. There is, at present, limited information on the mechanism of formation of the shell and o[...]
Article : texte imprimé
Matthieu Vandamme, Auteur ;
Franz-Josef Ulm, Auteur ;
Philip Fonollosa, Auteur
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Herein, we present a comprehensive nanoindentation investigation of cement pastes prepared at substoichiometric water-to-cement (w/c) mass ratios between 0.15 and 0.4 with and without heat treatment. Based on a statistical indentation technique,[...]
Article : texte imprimé
I. García Lodeiro, Auteur ;
A. Fernandez-Jimenez, Auteur ;
A. Palomo, Auteur
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Reducing Portland cement content in cementitious binders offers a means to address the adverse environmental impacts of Portland cement manufacture. This paper investigates the impacts on hydration product chemistry of partially replacing Portla[...]
Article : texte imprimé
Kolluru V. Subramaniam, Auteur ;
Xiaojun Wang, Auteur
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The response of hydrating cement paste through setting are monitored using rheological measurements and ultrasonic reflection measurements. Increases in the elastic modulus and yield stress of cement paste with time are obtained from the rheolog[...]
Article : texte imprimé
Johann Plank, Auteur ;
Dai Zhimin, Auteur ;
Helena Keller, Auteur
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The fundamental reactions leading to the intercalation of polycarboxylate (PC) superplasticizers into calcium aluminum hydrates were studied by hydration of pure C3A in the presence of PC at 75 °C. It was found that the amount of dissolved sulfa[...]
Article : texte imprimé
R.C.A. Pinto, Auteur ;
A.K. Schindler, Auteur
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The effect of temperature on the development of concrete compressive strength can be modeled by the maturity approach once the temperature sensitivity of the mixture, quantified by the activation energy (Ea) of its chemical reactions, is known. [...]
Article : texte imprimé
Alberto Sepulcre-Aguilar, Auteur ;
Francisco Hernandez-Olivares, Auteur
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Lime-based mortars containing pozzolanic additions of metakaolin, sepiolite and white Portland cement are studied in order to determine their performance as historic masonry conservation mortars. Hydration products on metakaolin–lime blended mor[...]
Article : texte imprimé
Nicolas Roussel, Auteur ;
Anael Lemaître, Auteur ;
Robert J. Flatt, Auteur
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Fresh cementitious pastes can be viewed as suspensions of particles of many different sizes (from several tens of nm to 100 μm) in a continuous fluid phase. This broad poly-dispersity implies that various interactions such as surface forces (or [...]
Article : texte imprimé
Peter Grassl, Auteur ;
Hong S. Wong, Auteur ;
Nick R. Buenfeld, Auteur
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In this paper, the influence of aggregate size and volume fraction on shrinkage induced micro-cracking and permeability of concrete and mortar was investigated. Nonlinear finite element analyses of model concrete and mortar specimens with regula[...]
Article : texte imprimé
X. Feng, Auteur ;
M.D.A. Thomas, Auteur ;
T. W. Bremner, Auteur
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In the current study, in order to elucidate the mechanisms for the favorable effects of lithium nitrate in controlling alkali silica reaction (ASR), vycor glass disk immersion specimens and glass disk–cement paste sandwich specimens were prepare[...]
Article : texte imprimé
P. Rucker-Gramm, Auteur ;
R. E. Beddoe, Auteur
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The penetration of water and non-polar hexane in Portland cement mortar prisms with different initial moisture contents was investigated using nuclear magnetic resonance (1H NMR). The amount of water in gel pores strongly affects the penetration[...]
Article : texte imprimé
David Conciatori, Auteur ;
Francine Laferrière, Auteur ;
Eugen Brühwiler, Auteur
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This article presents a comprehensive modeling of temperature, carbonation, water and chloride ions transport in cover concrete using the transport model “TransChlor”. The TransChlor transport model employs weather data and chloride ion concentr[...]
Article : texte imprimé
Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling
Seung-Jun Kwon, Auteur ;
Ha-Won Song, Auteur
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Carbonation on concrete structures in underground sites or metropolitan cities is one of the major causes of steel corrosion in RC (Reinforced Concrete) structures. For quantitative evaluation of carbonation, physico-chemo modeling for reaction [...]
Article : texte imprimé
Neven Ukrainczyk, Auteur ;
Tomislav Matusinovic, Auteur
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As the hydration of calcium aluminate cements (CAC) is highly temperature dependent, yielding morphologically and structurally different hydration products that continuously alter material properties, a good knowledge of thermal properties at ea[...]
Article : texte imprimé
Kimmo Karhunen, Auteur ;
Aku Seppanen, Auteur ;
Anssi Lehikoinen, Auteur
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We apply Electrical Resistance Tomography (ERT) for three dimensional imaging of concrete. In ERT, alternating currents are injected into the target using an array of electrodes attached to the target surface, and the resulting voltages are meas[...]
Article : texte imprimé
Ryan T. Chancey, Auteur ;
Paul Stutzman, Auteur ;
Maria C.G. Juenger, Auteur
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A comprehensive approach to qualitative and quantitative characterization of crystalline and amorphous constituent phases of a largely heterogeneous Class F fly ash is presented. Traditionally, fly ash composition is expressed as bulk elemental [...]
Article : texte imprimé
Kim Van Tittelboom, Auteur ;
Nele de Belie, Auteur ;
Willem de Muynck, Auteur
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As synthetic polymers, currently used for concrete repair, may be harmful to the environment, the use of a biological repair technique is investigated in this study. Ureolytic bacteria such as Bacillus sphaericus are able to precipitate CaCO3 in[...]
Article : texte imprimé
Koichiro Fukuda, Auteur ;
Tomoyuki Iwata, Auteur ;
Hideto Yoshida, Auteur
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In the CaO–SiO2–Al2O3–Fe2O3 pseudoquaternary system, the solid solutions of Ca3SiO5 [C3S(ss)], Ca2SiO4 [C2S(ss)], Ca2(AlxFe1 − x)2O5 with 0.40 ≤ x ≤ 0.57 (ferrite) and Ca3Al2O6 [C3A(ss)] were crystallized out of a complete melt with 52.9 mas[...]
Article : texte imprimé
Zhen-jun He, Auteur ;
Yu-pu Song, Auteur
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Triaxial tests were performed on 100 mm × 100 mm × 100 mm cubic specimens of plain high-strength and high-performace concrete (HSHPC) at all kinds of stress ratios after exposure to normal and high temperatures of 20, 200, 300, 400, 500, and 600[...]
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