In the United States, many States are using free draining porous bases under new portland cement concrete pavements. These porous bases are intended to remove infiltrated surface water, which cannot be prevented from entering the pavement structure. The porous bases used in the United States have coefficients of permeability ranging...
Performance of Concrete Pavement Drainage Systems in Spain
At present Spain has 1600 km of concrete pavements (two lane carriageways). The particular conditions of the climate and the heavy traffic make it necessary to use different measures to avoid joint faulting and voids under the slabs such as dowelled joints, non-erodible base courses, sometimes complemented by joint sealing...
Construction and Evaluation of Pavements with Porous Concrete Bases
Two test sections were constructed with a base course of porous concrete under the emergency lane of a motorway. This base composed of new aggregates or recycled aggregates, has the strength of a cement treated base and the function both of bearing capacity and drainage. Mixed in Plant and placed...
Reconstruction of a Section of the A9 Motorway Using Recycled Aggregate Concrete
In Germany the use of concrete with aggregates obtained from crushed concrete (RC aggregate) has been quite limited in comparison to other countries such as the USA and Austria. This situation is caused mainly by the lack of appropriate regulations for this kind of application. For this reason, the award...
Roadway Pavements of Recycled Concrete
In Switzerland deposits of gravel are growing scarce. For this and ecological reasons an effort is being made to recycle material, i.e. material produced by roadway demolition -instead of being dumpedshould be re-used in a way to achieve the highest possible quality. This means orderly reconstruction and separation of the...
Application of Cement to Stabilize Used Materials in Hydraulic Bounded Subbases
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...