In the last few years the interest for preventive environment measures has increased. That is the reason for stimulating the re-use of waste materials as a means of recycling. With the aim of stimulating the recycling of waste materials, the interest in using cement to stabilize different materials increased. This...
Reconstruction of Concrete Pavements Using Rubblized Bases
Reconstruction of concrete pavements can be performed by fracturing the existing concrete slabs into small pieces in situ and then placing a leveling course and overlay. The fractured slabs provide a firm base for the new pavement. The technique is increasingly used for the reconstruction of concrete pavements where the...
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...
The Utilization of Tarbearing Scarified Road Materials with Special Hydraulic Binders
The utilization of tarbearing scarified road materials, which are charged with phenols and polycyclic aromatic hydrocarbon (PAH) to a considerable extent, is becoming a problem of increasing urgency in Germany. This paper deals with the consolidation of tarbearing scarified road materials with a special hydraulic binder, which due to its...
In Situ Capping Layers Treatment with the Faquir Equipment
The treatment of subgrades with hydraulic binders is designed to increase the bearing capacity of the roadbed significantly. It thus offers a better support to the worksite traffic and the subgrade can be taken into account in the overall structural design of the pavement. The economic stakes are thus evident....
A New Technique for Preckracking Materials Treated with Hydraulic Binders
Precracking techniques are used for materials treated with hydraulic binders in order to restrict the effect of shrinkage cracks on the pavement performance. After developing a precracking technique for port platform stwctures in 1984, Via france recently received and developed a new technique for road pavements. This technique applies to...
Stabilization of Contaminated Soils
The elution behaviour of acid and alkaline soils, contaminated with diesel oil, PER and mercury salt, of different grading curves (sandy loam to loam-free fine gravel), was examined both before and after stabilization with cement. After cement stabilization, all heavily contaminated soils (eluate class Ill) yielded an eluate that corresponded...
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...
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...
Reconstruction of Low Volume Roads in Austria Using Cement Stabilization Mixed in Place
In view of the growing need for economic methods for rural road rehabilitation and reconstruction the use of cement stabilization mixed in place with existing pavement materials (recycling of milled material) is considered to be an economic and resource-saving approach. This paper describes the preparatory works required (inspection of the...
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...
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...