Characterization, pre-treatment, and potential applications of fine MSWI bottom ash as a supplementary cementitious material

With the development of waste recovery techniques, previous research has revealed that coarse fractions of municipal solid waste incineration (MSWI) bottom ash (BA) after proper treatment could be applied in the construction sector, while the fines are seldom recovered in practice and normally landfilled. This study explores the potential...

A new test setup for studying sand behaviour inside an immersed tunnel joint gap

During inspections of several immersed tunnels in the Netherlands, damage of immersion joints has been observed. In some cases the Gina seal has moved inwards from its original location, and in other cases a permanent elongation of the entire tunnel structure has been measured. For both cases it has been hypothesised that a seasonal expansion...

Probabilistic traffic load model for short-span city bridges

In the coming years numerous existing traffic bridges in cities are subject to re-evaluation. In this paper a new probabilistic traffic load model for short-span bridges is proposed. As an example, site-specific weigh-in-motion data from Rotterdam, the Netherlands, is included in the model. The method proposed in this paper allows for a very...

Spalling of concrete due to fire exposure: A coupled fracture mechanics and pore pressure approach

In this paper results are presented from a by STW funded research project “spalling of concrete due to fire exposure” between Eindhoven University of Technology and Delft University of Technology and aimed at developing an integral spalling model. In this paper two coupled Finite Element based models are presented in which the first model...

Ultimate limit state design for linings of bored tunnels: Tübbingbemessung im Grenzzustand der Tragfähigkeit beim Schildvortrieb

According to modern design codes, such as the Eurocode 7, also Soil Retaining structures should be designed according to Ultimate Limit State analysis, see [1]. From an economic point of view, the design of the lining, i.e. the thickness and reinforcement of it, would be optimal if the loading during construction is less critical than the...

The Structural (Un)safety of Tunnels Explained by Analytical Approach

From soft soil tunnelling practice it has been observed that the segmental thickness of the tunnel lining has a constant ratio to the tunnel diameter. Nevertheless many engineering models are published in literature and used in practice, which describe the structural behaviour of the tunnel lining. These models are used to analyse the structural...

Design philosophy of concrete linings for tunnels in soft soils

Geboorde tunnels met betonnen segmenten

Deze syllabus 'Betonnen tunnellinings' geeft een introductie in het constructief ontwerpen van betonnen wanden in boortunnels met grote diameter (> 5 meter), ook wel tunnellinings genoemd. Wereldwijd zijn verschillende typen linings toegepast in boortunnelprojecten. Echter, de functie van een aangebrachte lining is in de meeste gevallen dezelfde...