Materials

Traditional methods for road concrete pavements design do not take into account the structural contribuition of cemented bases and its fatigue consumption uiidei the traffic loads. Sections designed without major care about the structural reponses of those bases can develop early cracks, decreasing the structural capacity of the pavement. This...

The use of local aggregates of limestone nature for the producing of road cement concrete leads to obtaining numerous technical - economic advantages. Romania owns great limestone resources (over 3 milliards tons with an ensurance degree up to 999 years) smoothly spread over the entire surface of the country. In...

Laboratory tests have been carried out to examine the effect of the following parameters on the erosion behaviour in the case of cement treated subbases (CTB) below concrete pavements: aggregate mixture (gravel or sand), treatment (with wet treatment, without treatment), compressive strength requirement (varying cement content), arrangement of a geotextile...

Although the quality of the surface-deactivator is very important, the surface-deactivator will only react to the quality of the concrete onto which the surfcedeactivator is applied to. Therefore the surfacedeactivator will not be able to compensate for segregations, unsuitable concrete mix-designs or mistakes in application, etc. It is always recommended...

The construction method involving the placement of a 30 cm-thick concrete roadway pavement on a 30 cm-thick crushed aggregate unbound roadbase instead of a 2.6 cm-thick concrete pavement on a bound roadbase has proved its worth in Germany for more than 10 years, generally for heavy-traffic motorways. It has several...

In the case of roller-compacted concrete pavements (RCCP) in spacious site like yard, harbor and so on, socalled fresh joint technique at longitudinal joints is widely used in order to achieve high load-transfer efficiency. However traditional fresh joint technique allowed the limited length of placing, because delay between the fresh...

Exposed aggregate surfaces MA 8 have been used in Austria on a !arge scale since 1990 and have proveu not only noise-reducing but also very skid resistant. On different motorway sections paved with the same quarzitic chippings 4/8 the friction values (Stuttgart friction meter, 60 km/h, with water, with slip)...

With the development of draining concrete as a super whispering surface, the German Cement Industry has signalled a new era for the concrete structure. This special draining concrete is a so-called like-grained concrete with a cavity content of 20 - 25 vol.-%. The individual aggregate grains are cemented with a...

The concept of reinforcing pavements and of reinforced earth for improving the bearing capacity of insitu soils both under static and dynamic loading has gained popularity in receriL The word geotextile is now accepted by all civil Engineers to describe the textile used for improving the behavioural (structural) and functional...

This report presents the experimental studies on the bending fatigue properties of normally cast concrete and roller compacted concrete mixed with recycled aggregates produced from concrete waste and on the applicability of this concrete to pavement. The present studies provides the following principal conclusions. (1)Recycled aggregate can be used as...

In the European Committee of Standardization (CEN) road simulators have been proposed as test equipment for determining the wear resistance of concrete road surfaces to studded winter tyres. The purpose of this ring analysis was to find what relationship there is between three Nordic road simulators and to produce proposals...

In the domain of road building, recycled aggregate made from old concrete road pavings has been used in the construction of new concrete pavings for quite some time. Generally only the coarse fractions of more than 4 or 2 mm, respectively, are used as recycled material. Most of the recycled...