In the mechanistic design method of concrete pavements, the flexural fatigue properties have a great influence when analysing the design life. Accordingly, the purpose of this study is to clarify the effects of stress ratio (YmIn/cmax), maximum size of coarse aggregate and static flexural strength of the pavement concrete on...
Investigation on Thermal Stress and Prestress of a 151 m Prestressed Concrete Pavement
Few prestressed concrete pavements of more than 100 m length have been constructed in order to avoid the development of cracking at early ages as well as to get design prestress. It the prestressed concrete slab is paved as long as possible, the construction period is shorter and the cost...
Surface Characteristics and Driving Comfort on two Swedish Concrete Roads
In Sweden there is an increased interest in the performance based specifications of concrete roads, such as wearing resistance, friction and noice. Recently two concrete roads have been constructed with the special intention to improve the surface characteristics. Both roads were constructed with concrete that is resistant to wear and...
Quality Assurarice and Functional Demands
Quality a.curance and functional demands are taken more and more into account in contracts for road construction. This paper describes a contract for a 15 km long concrete pavement for a motorway in West Sweden. Functional demands were chosen for wear resistance, evenness, tensile strength, thickness, frost resistance, surface friction,...
Experiments with Concrete Pavements on the LCPC Fatigue Test Track
In France, the Highway Department, the concrete pavement contracting companies and the lime and cement industries represented by their national associations, initiated in 1991 a major experiment on the pavement fatigue test track of the Laboratoire Central des Ponts et Chaussées (LCPC). The objective of these full-scale tests was to...
Improvement of the Adherence between Old and New Concrete in Road Construction – Procedures and Testing Methods
The mechanical adherence properties of new concrete bound with old concrete surfaces which had been pretreated in a conventional manner as well as with new techniques, have been studied uding fracture mechanical methods. It was shown that far better adherences are achieved with specially structured old concrete surfaces than with...
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...
Urban and Pen-Urban Porous Pavements
The control of disturbances (noise, flooding, runoff water pollution, etc.) nowadays constitutes a major preoccupation of local populations. The roadway, in the diversity of the functions it performs in the urban and pen-urban scctor, can contnibutc activcly to the control of such disturbances. Porous pavements constitute a valuable area of...
The Implementation of RCC Pavements in Colombia
Colombia is a developing country with enormous difficulties for the implementation of new technologies due to their introduction costs and the positioning of existing ones. Despite the constant academic efforts to keep it alive, the construction of concrete pavements has been asleep for years as a consequence of the obsolescence...
Experiences with the Treatment of some Defects of a Concrete Pavement during Construction
The aim of this paper is to discuss some defects of the concrete pavement during the construction of the second northern expressway project in Taiwan. The possible reasons of and techniques for repairing these defects are studied in the paper. The defects discussed include the cracks in the lean concrete...
The Construction of Underground Concrete Roadways at Finsch Diamond Mine (South Africa)
In this paper the different types of underground roadways, the development of the design of in situ concrete paving and the problems of designing for these special conditions are discussed. These include the use of moisture sensitive subgrade/subbase, very irregular founding conditions, varying and even dynamic loading due to blast...
New Opinions in the Friction Problematic with Brushed Textures and Exposed Aggregates
Washed or fine brushed concrete was introduced in the Netherlands, replacing rough brushed concrete, to reduce the road noice. In many cases the minimum friction coefficient required was not reached. However, measurements carried out some months later showed an improvement of the results. To investigate if this improvement of the...