Recent years have witnessed the significant development of public surface transport systems: in our cities: tramways, systems on tyres, right-of-way bus corridors, etc. This phenomenon is a response to the high stakes involved for mobility and communication in urban areas. These projects have seen the emergence of new problematics related...
Guided Public Transport Infrastructures Contribution of Cement Concrete in Innovative Designs
Working Mechanisms of Air-Entraining Agents
From some job sites it was reported that the air void content of the hardened road concrete was considerably higher than that of the fresh concrete. Initial investigations in the Research Institute with six air-entrainers based on synthetic and natural active agents showed that a substantial increase in air content...
Modified Concrete by Replacing Part of the Coarse Aggregates by Milled Bituminous Materials of the Same Grading
The properties of concrete mixes produced by replacing the coarse aggregates by milled bituminous materials of the same grading are studied in the laboratory. The milled bituminous material used comes from reclaimed asphalt concrete produced in road maintenance works. The properties investigated are compressive and flexural strength, modulus of elasticity,...
A Feasibility Study of Incorporating Bottom Ash in Roller Compacted Concrete Pavements
Roller compacted concrete as a pavement material has been gaining acceptance over the past years. RCC can be of particular interest in base course applications combing attractive cost with easiness of construction. RCC is a friendly pavement material to incorporate by-products of industries such as bottom coal ash. This paper...
Investigation on the Possibility of using Concrete Containing Plastic Waste as Aggregates for Pavement Construction
Increasingly plastics become the material of choice by product designers because they provide useful properties and for this reason the worldwide production of plastics is growing year after year. At the European level the reference concerning the recycling and reuse of waste plastics obliges Member States to recover and recycle...
De-Pollution Activity Assessment of Photocatalytic Cement-Based Materials from Laboratory to Real Scale Testing
Photocatalytic materials are discussed for various applications in building technology ranging from de-soiling to de-polluting applications. However most of the efficiency proofs are derived from indirect laboratory scale tests. Italcementi Group has developed a range of cement-based products based on the TX Active? concept demonstrating both photocatalytic activity and performances...
Concrete Pavements with Geotextile Interlayer in Germany Measurements and Long Term Behaviour
Since 2001 the design with an interlayer of geotextiles is a standard structure in the German pavement catalogue RStO 01. Geotextiles shall guarantee uniform, elastic support of the concrete slab, hence reducing stresses due to temperature and moisture gradient, reduce pumping processes and prevent an origination of reflection cracks from...
Measurement and Effect of Dowel Bars Alignment in Concrete Pavements
The precision and applicability of two non-destructive measuring methods for dowel bars alignment: Ground Penetrating Radar (GPR) and the Pulse Induction method (PI). was investigated. The project was sponsored by the German Federal Ministry of Transport, Building and Urban Affairs (Bundesministerium für Verkehr, Bau und Stadtentwicklung BMVBS). The...
First Use of Whitetopping in Switzerland
This document describes the design and construction of the concrete whitetopping repair of a severely distressed pavement of a road section at a regional road intersection. In the past, repair of this road section with asphalt overlays repeatedly failed to withstand the severe shear loading to which the pavement is...
White Topping Assessment of Asphalt Concrete Interfaces
For the rehabilitation of rutted asphalt pavements white topping and ultra thin white topping turned out to be adequate methods. The force-fit bonding between asphalt and concrete is a pre-condition for the functioning and durability of this method. Little attention is paid on testing of the bonding; in the majority...
New Innovative Road Construction Method Whitetopping a Quick Way to Resolve Rutting
Road traffic in Germany is increasing steadily year after year and recent forecasts have predicted that it will continue to do so. At the same time, neither the German central government, the federal states nor the towns and cities have the funds required for new infrastructure projects and urgently needed...
Concrete Pavement Without Dowel Bars
The joint system presented herein takes advantage of the natural development of shrinkage in concrete to induce the formation of joints along the projections of previously placed system devices. Such system induces in an in-situ concrete pavement an efficient interlocking indentation among the slab elements resulting from the shrinkage phenomenon....