The experiment presented here has been carried out within the context of a partnership research contract signed between the Road Directorate (French Ministry of Civil Equipment) and the GTM Construction Company. The autors are thanking both partners, and the following organizations or companies, which contributed with equal success to the...
Roller Compacted Concrete Pavements in the Basque Country
This paper presents the main features of roller compacted concrete (RCC) pavements for low-volume roads constructed in the Spanish Basque Country since 1992. RCC is produced in ready-mixed concrete plants and placed by local asphalt contractors. Due to the small thicknesses (15-18 cm) of these works, RCC layers can be...
Standard Designs for Concrete Roads
A manual on standard pavement design has recently been presented in The Netherlands. This manual deals with various types of roads constructed in plain concrete, composed as Publication no. 120 under the auspices of CROW (CROW = Centre for Research and Contract Standardization in Civil and Traffic Engineering). The manual...
Numerical Investigation on Deformations and Stresses in Concrete Highway Pavements
In this paper, results of numerical simulations of the deformation behaviour of concrete highway pavements under hygral and thermal gradients are presented. It is shown that.high temperature gradients, which could be caused by a temperature shock may lead to thermal cracking at the surface of the concrete. Further shrinkage cracking...
Use of Porous Concrete Road Tiases in Belgium
Porous concrete is mainly used to prevent problems of water stagnation between a concrete pavement or a block paving surface and the base. In the new tender specifications SB 250 of the Flemish Region, requirements concerning porous concrete have been introduced, in particular a percentage of voids of between...
PCC (Paver Compacted Concrete)
FCC (Paver Compacted Concrete) is laid with conventional road payers equipped with special screeds, namely with High-Power Compaction Screeds. The main difference compared with other concrete technologies primarily used in nowadays road construction (slipform paving) is that FCC is compacted from the surface with tamping, vibrating and pressing compacting systems....
Sand-Rich Concrete – An Alternative to Ordinary Concrete
The natural raw materials gravel and sand are worldwide mined on a large scale. In many areas of Germany natural resources contain 70 % (and more) sand and less than 30 % gravel. Therefore in particular very fine sand often cannot be used and must be stored in waste disposal...
The Namur Test Road Behavior of Various Types of Contraction Joints After 17 Years of Traffic
This article describes the behaviour after 17 years of service of the test sections constructed in 1979 on State road N 4 in the Belgian province of Namur. The object of this experiment, is to compare various types of contraction joint on the same site and under the same conditions...
Hydraulic Concrete Roadways on the Autopista Del Mediterraneo Appraisal and Management
This paper addresses the appraisal and management procedure used for more than 20 years by a toll motorway concessionaire, covering a total of 300 kilometres of concrete dual carriageway built between 1970 and 1985. The system of analysis, surveys and experiments carried out during this period was based on auscultations...
The Importance of Continuous Slab Support and Load Transfer at Joints in the Performance of Thin Concrete Overlays
Studies on the structural performance of existing Portland cement concrete roads in South Africa (1) have shown that the traffic utilizing these roads is not the pnme initiator of structural failures. Factors such as construction, environment and slab support conditions are predominant in initiating structural failures. However, it is also...
A New Laboratory Test to Evaluate the Shear Resistance at the Interface of Thin Bonded Overlays
The effectiveness of thin bonded overlays depends upon the adhesion level at the interface with the existing concrete pavement. It appears that shrinkage, particularly at the very early ages (18-24 hours), is mainly responsible for delamination, i.e. separation between old pavement and overlay. The present paper discusses the results of...
Recycling Cold-Milled Asphalt Concrete Materials as Cement Bounded Base
The authors present a synthesis of the results obtained on 3 test sections where cold-milled bituminous concrete has been recycled for the reconstruction of the stabilized base for medium trafficked roads. The inert skeleton for the base was made from 85% (by weight) milled material and 15% sand, this in...