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Depuis quelques années, le suburbain acquiert une position de plus en plus importante dans le débat urbanistique et architectural. D’une part, les théories formulées à son sujet ont connu de conséquentes évolutions : majoritairement perçu comme peu stimula ...
Presses Polytechniques et Universitaires Romandes2012
The basic nature of alkali hydroxides (NaOH, KOH) when added to mixing water, increases the pH in proportion to the level of salt addition. For alite (impure tricalcium silicate; MIII-Ca3SiO5) hydration, this pH increase accelerates the rate of hydration a ...
The concept of CO2 storage relies on the long-term sealing properties of both the geological trap and the wells needed to inject and monitor CO2. Well integrity, a classical topic in the oil and gas industry, is thus critical for the performance of any CO2 ...
In the context of sustainable development, building insulation represents a major concern as a means of increasing energy efficiency. In order to comply with new norms such as the Passive House standard, locations where load-bearing components must penetra ...
Tricalcium aluminate (C3A) is one of the main constituents of Portland cement. Even though it represents less than 10% of the total composition, its strong reaction with water can lead to a rapid setting, called flash set. Gypsum is added to regulate this ...
The early hydration of alite, in particular the reason for the onset of the induction period, has been a subject of controversy for many decades. Several theories have been proposed, principally the formation of a protective phase inhibiting dissolution or ...
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 mu ic. Comparison w ...
Fragments of a Portland cement clinker were examined by scanning electron microscopy with backscattered electron imaging and X-ray microanalysis. In some, the microstructure was normal, but in others varying proportions of material having features characte ...
