How mobile is tritiated water through unsaturated cement-based materials? New insights from two complementary approaches

Two complementary approaches to event - based control

Event-based control aims at reducing the communication effort within a control loop by closing the feedback loop only if an event indicates e.g. a substantial control error. This paper proposes two new methods for event-based control that conjointly guarantee ultimate boundedness of the event-based control loop. The global approach faces the problem of driving a system from its initial state in...

Water dynamics in cement paste : insights from lattice Boltzmann modelling

Transport properties are often used as indicators of durability because water underpins most of the degradation mechanisms of concrete structures. The objective of this thesis is to understand the link between the microstructure and the permeability of cement paste, the binder phase of concrete. To achieve this goal, the lattice Boltzmann method is used to simulate the flow through three-dimens...

Early-Age Properties of Cement-Based Materials: II. Influence of Water-to-Cement Ratio

The influence of water-to-cement mass ratio (w/c) on early-age properties of cementbased materials is investigated using a variety of experimental techniques. Properties that are critical to the early-age performance of these materials are tested, including heat release, semiadiabatic temperature, setting time, autogenous deformation, and strength development. Measurements of these properties u...

Two new a,b-unsaturated butyrolactone derivatives from Pleione bulbocodioides

Two new a,b-unsaturated butyrolactone derivatives, 4-(400-hydroxybenzyl)-3-(30-hydroxy-phenethyl)furan-2(5H)-one (1) and 3-(30-hydroxyphenethyl)furan-2(5H)-one (2), together with one known phenolic compound (3), were isolated from the tubers of Pleione bulbocodioides (Franch.) Rolfe. Their structures were elucidated by analysis of spectroscopic data. # 2007 Wen Yuan Gao. Published by Elsevier B...

1 Current Innovations in Cement - Based Materials