Cement and concrete research, Vol. 39 N° 10. Cement and concrete research - Octobre 2009
| Titre : | Cement and concrete research, Vol. 39 N° 10. Cement and concrete research - Octobre 2009 |
| Type de document : | Bulletin |
| Paru le : | 22/11/2009 |
Dépouillements
Article : texte imprimé
Antonio J.M. Cuberos, Auteur ;
Ángeles G. De la Torre, Auteur ;
M. Carmen Martín-Sedeño, Auteur
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High belite cements may be an alternative to reduce CO2 emissions. Although CO2 emissions may be depleted up to 10%, unfortunately, the hydration reactivity of belite phases is slow which leads to low mechanical strengths at early ages. In order[...]
Article : texte imprimé
P. F. G. Banfill, Auteur ;
O. Rodríguez, Auteur ;
M.I. Sánchez de Rojas, Auteur
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This paper reports the influence of calcining temperature on the rheology of blended cement pastes with 10 and 20% of thermally activated paper sludge as pozzolan at water/binder ratio of 0.5 and 0.4. The kaolinite based waste was activated at d[...]
Article : texte imprimé
Shashank Bishnoi, Auteur ;
Karen Scrivener, Auteur
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This paper investigates the applicability of nucleation and growth mechanisms to the hydration of alite. Various possible mechanisms of nucleation and growth were simulated using the recently-developed microstructural modelling platform μic. Com[...]
Article : texte imprimé
Pietro Lura, Auteur ;
Jon Couch, Auteur ;
Ole Mejlhede Jensen, Auteur
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In this study, the acoustic emission activity of cement pastes was investigated during the first day of hydration. Deaired, fresh cement pastes were cast in sealed sample holders designed to minimize friction and restraint. The majority of acous[...]
Article : texte imprimé
Nicolas Robeyst, Auteur ;
Christian U. Grosse, Auteur ;
Nele de Belie, Auteur
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Research on ultrasonic methods to monitor the setting of concrete has mainly focussed on the wave velocity as a useful quantity. To investigate the application of also the wave energy as a parameter, an experimental program was set up to apply t[...]
Article : texte imprimé
Nicolas Robeyst, Auteur ;
Christian U. Grosse, Auteur ;
Nele de Belie, Auteur
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Research on ultrasonic methods to monitor the setting of concrete has mainly focussed on the wave velocity as a useful quantity. To investigate the application of also the wave energy as a parameter, an experimental program was set up to apply t[...]
Article : texte imprimé
Gregor Trtnik, Auteur ;
Marko Ivan Valič, Auteur ;
Franci Kavčič, Auteur
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This paper presents the comparison between ultrasonic wave transmission (USWT) method and ultrasonic wave reflection (USWR) method in their ability to monitor the setting process of cement pastes. The velocity of ultrasonic longitudinal waves an[...]
Article : texte imprimé
Ryan Henkensiefken, Auteur ;
Javier Castro, Auteur ;
Dale Bentz, Auteur
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The increased propensity for shrinkage cracking in low water-to-cement ratio (w/c) concrete has inspired the development of new technologies that can reduce the risk of early-age cracking. One of these is internal curing. Internal curing uses sa[...]
Article : texte imprimé
Mustafa Şahmaran, Auteur ;
Mohamed Lachemi, Auteur
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This investigation was carried out to study the effects of using a replacement percentage of saturated lightweight fine aggregate (LWA) as an internal curing agent on the shrinkage and mechanical behavior of Engineered Cementitious Composites (E[...]
Article : texte imprimé
B. Bary, Auteur ;
M. Ben Haha, Auteur ;
E. Adam, Auteur
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Cement pastes are heterogeneous materials composed of hydrates, anhydrous products and pores of various shapes. They are generally characterized by a high particle concentration and phase contrasts, in particular in the case of degraded material[...]
Article : texte imprimé
The oxygen diffusion coefficient through hydrophobic cement-based materials fully immersed in water was determined by potentiostatic measurements on concrete and by the use of a diffusion cell on cement pastes and mortars. The obtained results s[...]
Article : texte imprimé
A. Bertron, Auteur ;
G. Escadeillas, Auteur ;
P. de Parseval, Auteur
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The purpose of this paper is to present a method for processing electron microprobe data coming from the analysis of degraded cementitious materials. The application domain is that of cement matrices exposed to attack by aggressive media inducin[...]
Article : texte imprimé
Sebastian Seufert, Auteur ;
C. Hesse, Auteur ;
F. Goetz-Neunhoeffer, Auteur
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Technical OPC contains mixed sulfate carriers in varying amounts. Gypsum and anhydrite are added to the clinker during the milling process where the gypsum dehydrates partially to bassanite and anhydrite. Due to different hydration kinetics of t[...]
Article : texte imprimé
E. Mozaffari, Auteur ;
J.M. Kinuthia, Auteur ;
J. Bai Wild, Auteur
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Wastepaper Sludge Ash (WSA) contains reactive components such as free lime (CaO), and less reactive and inert mineral species. When water is added to WSA some constituents hydrate faster than others, lime being the fastest giving high alkalinity[...]
Article : texte imprimé
Renata Tišlova, Auteur ;
Antonina Kozłowska, Auteur ;
Roman Kozłowski, Auteur
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Mercury porosimetry, water vapour and nitrogen adsorption were used to follow the hydration of Roman cements — belite cements calcined at low temperature. Generally, unimodal distribution of pore sizes was observed, with the threshold pore width[...]
Article : texte imprimé
H.S. Wong, Auteur ;
N. R. Buenfeld, Auteur
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We propose a new method to estimate the initial cement content, water content and free water/cement ratio (w/c) of hardened cement-based materials made with Portland cements that have unknown mixture proportions and degree of hydration. This met[...]
Article : texte imprimé
Numerical analysis of fracture in concrete is studied with a simplified meshless method. In this meshless method, the crack is represented by a set of disconnected cohesive crack segments that are required to pass through meshless nodes. The cra[...]
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