The role of eigen-stresses on apparent strength and stiffness of normal, high strength, and ultra-high performance fibre reinforced concrete

Concrete is characterized in terms of its engineering properties, mainly strength and stiffness, which are subsequently used in structural design. However, the apparent (i.e., measured) concrete properties are not intrinsic but dependent on the conditions under which the measurement is performed. Herein a combined experimental and numerical...

Analysis of the durability of high strength concrete with superabsorvent polymer

The High Strength Concretes (HSC) provided significant advances in civil construction, due its superior strength, efficiency and durability. Due to the high content of cement, low water/cement ratio and mineral additions, it is essential to avoid the emergence of tensile stresses generated autogenous shrinkage and consequently the cracking of...

Lange overspanningen in geprefabriceerd beton: Een onderzoek naar brugoplossingen om langere overspanningen, tot 100 meter, mogelijk te maken in geprefabriceerd beton

The Netherlands is a densely populated country with a congested road and railway network. Therefore more and more highways are widened and expanded. These wider highways create a demand for bridges which are suited for longer spans. These bridge solutions should constructed with a minimum of hindrance for other traffic. Rijkswaterstaat, also...

Crack widths in HSC: A study into crack width prediction methods for slender HSC balconies

This master thesis covers the research into cracking behaviour of slender high strength concrete cantilevering balconies. The research emerged from Pieters Bouwtechniek Delft and Hi-Con Denmark. They cooperatively designed very slender balconies in ultra-high performance fibre reinforced concrete. Other engineering firms tend to recreate these...

Optimisation of a high strength concrete plate bridge

Since the first high strength concrete mixtures were designed in the 1970s, a lot of research is performed. Despite the recommendations that were written, full legislative coverage of high strength concrete remained unavailable. The new Eurocodes are also valid for high strength concrete, so the question rises how high strength concrete can be...

High strength fibre reinforced concrete: Static and fatigue behaviour in bending

Recently, a number of high strength and ultra high strength steel fibre concretes have been developed. Since these materials seem very suitable for structures that might be prone to fatigue failure, such as bridge decks, the understanding of the static and fatigue bending behaviour is vital. In order to evaluate the bending behaviour of high and...

Autogenous Deformation and Internal Curing of Concrete

High-performance concrete (HPC) is generally characterized by a low water/binder ratio and by silica-fume addition, which guarantee a low porosity and a discontinuous capillary pore structure of the cement paste. Modern concretes possess some highly advantageous properties compared to traditional concrete, such as good workability in the fresh...

Effect of Reinforcement on Early-Age Cracking in High Strength Concrete

Hoge sterkte betonnen schuiven in de stormvloedkering Oosterschelde

De reden van dit haalbaarheidsonderzoek is het corrosieprobleem van de huidige stalen schuiven in de Stormvloedkering Oosterschelde. Tijdens de bouw van de kering bleek het verven van de schuiven een langdurig proces. Zozeer zelfs, dat men dreigde de officiele opening niet te gaan halen. In overleg met de aannemer is toen besloten een andere...