In the field of research on secondary materials, an experimental study on the re-use of building demolition waste has been conducted. These materials will be used in Italy, further to decree-laws and regulations, drawn in compliance with the rules of the Community Law 1 9 w93h, ich has already been...
Concrete Made of Building Demolition Waste
Experiences with Noise Reducing Surfaces for Existing Concrete Pavements
In Carinthia a surface dressing with epoxy resin as binder and chippings 3/4 mm has been used since 1989. The task was to get better noise reducing conditions of existing concrete pavements. The result can be seen in noise reducing properties of - 6 db(A) compared with the existing old...
The Reuse of Old Pitch Containing Asphalt in Cement Bound Base Courses Depending on the Level of Harmful Substances
Large quantities of old asphalt containing varying admixtures of tar/pitch are produced during the renewal of asphalt roads. These pitches contain environmentally relevant substances such as pnlyr.yr.lic aromatic hydrocarbons (PAHs) and phenols which must not be allowed to leach out into the ground water. The intention is to bind the...
Continuously Reinforced Concrete with Noise Reducing Surface for the Reconstruction of the E31 3 (Al 3) Motorway in Hasselt (Belgium)
rFor the reconstruction of the E31 3 motorway which was constructed with concrete slabs round about 1960, CRCP was chosen and since 1983 the exposed aggregate technique was applied there. As the conventional exposed aggregate concrete is still too noisy, in 1992 it was decided to pursue the reconstruction works...
Recycling Concrete Pavements in Motorway Construction
Concrete, which has withstood all the loads on heavily used roads for many decades, can be used again as a concrete aggegrate in road pavement construction after undergoing appropriate treatment. The example of four pavement batches prepared by 2 different companies in 1992 and 1993 on the A27 motorway m...
Reducing Traffic Noise on Cement Concrete Pavements
This paper concerns a joint research programme being undertaken by the Roads and Traffic Authority of New South Wales (Australia) and the Cement and Concrete Association of Australia. The objective of the research is to develop quieter concrete road surfaces, whilst maintaining acceptable skid resistance, by modifying the surface texture...
Concrete Recycling in Belgian Road Construction – Applications in Cement Bound Road Bases and Surfacings
For some years now the interest for the environment together with economic reasons, improvements of crushing plants and the definition of acceptance criteria have led in Belgium to an increased use of crushed concrete aggregate and sand in cement bound bases. Recent official circulars and tender specifications allow for the...
Noice Reducing Exposed Aggregate Surfaces – Experience and Recommendations
In 1990 a technique for building pavements with a noice reducing concrete surface was developed in Austria. The top layer contains aggretate with 8 mm maximum size. The surface is sprayed with a retarder and brushed the next day to expose the aggregate. This technique has been used on 120...
New from Old – Recycling Concrete Pavements
About 50% (150 km) nf the ennerete pavement on the motorway Al Vienna-Salzburg are older than 30 years and need reconstruction: The recycling method developed in 1 989/90 is based on the principle of making new from old. The old concrete pavement is used as a quarry and provides the...
Noise Reducing Concrete Block Pavements
In recent years several investigations were carried out in Germany aimed at reducing the tyre-road noise on concrete block pavements. The results show that these pavements can be constructed with a surface producing the same low traffic noise level as the reference asphalt road surface. In the paper, conclusions are...
Recycling of Concrete for the Reconstruction of the Concrete Pavement of the Motorway Vienna – Salzburg
From 1991 to 1993 60 km of carriageway were reconstructed on the motorway Salzburg-Vienna, re-using the old concrete pavement 100% on the work-site. The fine material (0/4) that resulted when crushing the old pavement was added to the old granular subbase which without would have been too coarse-grained to be...
Skid Resistance of Exposed Aggrcgate Concrete
From 1990 to 1992 exposed aggregate concrete was used for the construction of 14 sections of Austrian motorways. This technology offers a noise reduction and a higher level of skid resistance. In order to evaluate the skid resistance of these surfaces in comparison to others, measurements were carried out in...