As a result of a short mixing time excess air-entraining agent (AEA) is added during the production of air-entrained concrete to achieve the required air content. In this case, the fresh concrete contains AEA that has not been fully activated. If there is a subsequent input of mixing energy, the...
Guidelines for Concrete Roundabouts in the Netherlands
Due to the durability advantages of concrete pavements, the application of concrete for roundabouts is gaining more and more popularity among commissioning authorities. In the Netherlands it is estimated that there are over 3,000 roundabouts. The market share of concrete is still growing. Concrete roundabouts can only be durable when...
Effect of Curling Behavior on Surface Smoothness of Continuously Reinforced Concrete Pavement
The curling behavior of the continuously reinforced concrete pavement (CRCP) under environmental loads was analyzed by measuring vertical displacements at a number of different longitudinal and transverse locations, and the relationship between the surface smoothness and curling behavior was investigated. Two different crack spacings were selected and at each discrete...
The Rehabilitation of the Underpass Bleicherweg in Zürich
In Zurich the underpass Bleicherweg had to be maintained. An important part of the job was the pavement. The civil engineering department of the city of Zurich decided that the original asphalt pavement had to be replaced with a concrete pavement. The base of this decision, minimize possible water vapor...
Probabilistic Life-Cycle Cost of Pavements Characterization and Application of Parameter Input Variation for Scenarios
Life Cycle Cost Analysis (LCCA) evaluates the economic performance of alternative pavement investments. Currently, practitioners treat input parameters as static, deterministic values, which although computationally simpler, will hide the implicit uncertainty underlying the analysis. Over the past decade, an emphasis has been placed upon accounting for uncertainty by treating input...
A Review of Mechanisms Associated with Premature Joint Deterioration in Concrete Pavements
Premature deterioration of sawn joints has been reported in some cold climate regions in the USA. This paper reviews the multiple mechanisms have been found to contribute to the deterioration. Laboratory and field investigations have shown that freezing and thawing of saturated concreted is a dominant factor. Magnesium and calcium...
Technical and Economical Feasibility of Pavement Widenings in Cement Concrete in the Netherlands
In 2009 the Dutch Parliament amended special laws to speed up road widening projects. This situation opened possibilities for sustainable concrete pavements needing less maintenance, especially for the right-hand lane that takes the heavy traffic. This paper presents the results of a study carried out in 2009, by a working...
Evaluation of the Pavement Structure of Concrete Road Constructions Using the Falling Weight Deflectometer (FWD)
In view of increasing operation and maintenance requirements on existing concrete roads, it is im-portant to gain knowledge about their present bearing capacity. For this task, the Falling Weight Deflectometer (FWD) has proved to be of practical value for years in Germany and other countries worldwide. The FWD is a...
Pervious Concrete Pavement Performance in the Canadian Freeze-Thaw Climate
Pervious concrete pavement is a sustainable paving material that allows moisture to drain from the surface and naturally infiltrate into the subgrade. Pervious concrete pavement has been used consistently, with success, throughout the southern United States where freeze-thaw cycles are not common. Use of this valuable paving material in freeze-thaw...
Slag Usage in Concrete Pavement
One of the main problems faced by today's engineers is the lack of quality natural materials and accumulation of waste materials. Among the materials which are increasingly burdening landfills are industrial by-products. Slag is one of the common used industrial by-products and it can be used in all layers of...
A Bonded Concrete Overlay in An Urban Boulevard in Calvià (Mallorca, Spain)
The Boulevard of Peguera, placed in the municipality of Calviá (Mallorca, Spain), is the main commercial axis of the town and, for this reason, it supports an important traffic compared with other urban roads, around 100 heavy vehicles per day. At the beginning of 2008, the Council of Calviá proposed...
Concrete Pavements in the Province of Almeria the Experience of the Diputación De Almería
The Diputación de Almería has approved biannual plans to improve agricultural and rural tracks and roads in the region, which are financed by, in addition to the Diputación de Almería, also by the European Union, the Junta de Andalucía and the municipalities in the zone. Improving these trails in general...