Safety barriers are an essential device on roads, especially on highways. The European Standard EN 1317 defines the requirements of different safety levels that safety barriers have to comply with. Precast concrete and slipformed/cast-in-situ barriers are very successfully used as permanent barrier. Additionally precast barriers are a perfect solution for...
The Usage of Concrete Barriers for Modern Road Design and Efficient Construction Site Management in Europe
Concrete Roundabouts
As is the case in several European countries, Belgium is also constructing more and more roundabouts at busy intersections. They offer a better guarantee of a fluent, but at the same time safer, flow of traffic. The road surface of a roundabout is placed under a heavy load. In addition...
A New Rigid Pavement Constructive Method Using Hexagonals Slabs
This paper describes a new rigid pavement constructive method employing hexagonals slabs, being the angle betwen the edges of the slabs at each corner, 120 degrees. This paper is based on the one titled ´´ NEW JOINTS IN RIGID PAVEMENT - HIGHWAY AND AIRPORT´´, of the 8th International Symposium on...
Experimental Validation of Rigid Road Structure Design
surfaces, which is a product developed by the BRRC (Belgian Road Research Centre) and Febelcem (Federation of the Belgian Cement Industry), it became clear that it would be necessary to conduct onsite validation in the area of rigid roads. In particular, the various hypotheses regarding the effectiveness and durability of...
Concrete Roads in Pavement Management Systems from Technical To Political Responsibilities
CROW published in 2001 in the Netherlands the new national methodology on Pavement Management Systems on asphalt, block pavements and concrete roads. DHV has been the author of this publication. Two major improvements are implemented in this new methodology: 1. concrete pavements are fully included 2. a connection has been...
Laboratory Studies for a New Self-Compacting Bleeding Cementitious Material For Pavement Bedding
This paper presents a new generation of cementitious material devoted to pavement bedding layer construction and named MACES. This material contains a high volume of water in order to be very fluid and selfcompacting. It has also been designed in such a way that the free water in excess rapidly...
Comparative Investigation on Concrete Pavement Thickness Using Industrial Waste Chips, Steel Fiber and Silica Fume
Application of steel fiber in concrete would increase modul of rapture (MR) and module of elasticity (E), which in turn decrease slab thickness in rigid pavements. Hence, damaging stresses due to thermal and moisture is reduced. Where as concrete mixes with Silica Fume (SF) would perform the same behavior with...
The Use of By-Product Phosphogypsum with Cement for Soil Stabilization
The aim of this research is to improve the properties of the soil by using phosphogypsum with cement stabilizing agent.Phosphogypsum and cement were used with the locally available soils in different portions and Atterberg limits, maximum dry density, optimum moisture content and unconfined compressive strength test were determined. It was...
Concrete Safety Barrier in the UK
This paper describes the usage of concrete safety barrier on high speed roads in the UK, drawing on experiences gained over the 10 years since their introduction, and the enhancements and improvements developed in this time. The paper is primarily concerned with in-situ slipformed concrete safety barrier and comments on...
Temperature Differential in Concrete Pavements in Tropical Environment
Results of over one year monitoring concrete pavement slabs in São Paulo, where a typical hot-wet environment prevails, were presented. The experimental test tracks comprise 15 different concrete slabs instrumented with thermal resistors allowing the monitoring of temperatures. Over the course of the monitoring, it was sought the influence of...
Deriving California-Type Profilograph Outputs from Rsp Roughness Measurements
The roughness specifications of a recent Israeli PWD concrete road project, consisting of a 4-lanes stretch of a 7- kilometer length (Route No.3), included both bonuses and penalties in their pay-adjustment functions. The California-type profilograph outputs served as the data for these functions. The reason for using this particular profile...
Overview and Comparison of the New Belgian Standard Specifications For Concrete Roads
Belgium is made up of 3 regions: the Region of Flanders, the Walloon Region and the Brussels Capital Region. Managing and maintaining the national trunk roads is a regional matter and therefore also carried out in Belgium by three different administrative authorities. Each of these administrative authorities has drawn up...