A system for assessing the materials used for the construction of a concrete road is presented. The materials constituting the three layers of the pavement -ely stabilised granular mix, cement-bound mix, concrete and porous concrete for the road shoulders- were accurately selected and subjected to thorough controls during construction. The...
Materials Mix Design and Quality Control
Construction of Concrete Pavements on Bituminous Draining Bases
In January 1 9a9 1ro, ad section of 12 km, the access to Zaragoza from Huesca (Spain), was opened to the traffic. Works presented two main technical singularities in Spanish road design and construction. The first one was the introduction in Spain of the construction of rigid pavements on bituminous...
Concrete Made of Building Demolition Waste
In the field of research on secondary materials, an experimental study on the re-use of building demolition waste has been conducted. These materials will be used in Italy, further to decree-laws and regulations, drawn in compliance with the rules of the Community Law 1 9 w93h, ich has already been...
First Experimental Application of Deactivated Coloured Concrete in Belgian Road Construction
Deactivated coloured concrete is characterized mainly by two factors: its colouring and its surface treatment. Colouring is achieved by using preferable coloured aggregates and admixing the mortar with a dye. The surface treatment consists of chemical aggregate exposure. A first major experiment in Belgium combining coloured concrete and chemical aggregate...
The Reuse of Old Pitch Containing Asphalt in Cement Bound Base Courses Depending on the Level of Harmful Substances
Large quantities of old asphalt containing varying admixtures of tar/pitch are produced during the renewal of asphalt roads. These pitches contain environmentally relevant substances such as pnlyr.yr.lic aromatic hydrocarbons (PAHs) and phenols which must not be allowed to leach out into the ground water. The intention is to bind the...
Effects of Classified Fly Ash on Improving the Compactability of Roller Compacted Concrete for Pavements
Roller compacted concrete (RCC) pavements are expected to be an economic and rational concrete pvPmAnt system that will become increasingly popular in Japan. The maximum thickness of a RCC slab completed in one layer is limited to 25 cm because of limitations in the compactability of the concrete and the...
Recycling Concrete Pavements in Motorway Construction
Concrete, which has withstood all the loads on heavily used roads for many decades, can be used again as a concrete aggegrate in road pavement construction after undergoing appropriate treatment. The example of four pavement batches prepared by 2 different companies in 1992 and 1993 on the A27 motorway m...
Development of a Roller Compacted Concrete Pavement Reinforced with Continuous Steel Bars
A roller compacted concrete pavement (RCCP) reinforced with continuous steel bars was recently developed at the New Tokyo International Airport. The construction is fast and the effectiveness of load transfer at cracked sections of the continuously reinforced concrete pavement is high. This RCCP was built in two layers. Steel bars...
Reconstruction of Low Volume Roads in Austria Using Cement Stabilization Mixed in Place
In view of the growing need for economic methods for rural road rehabilitation and reconstruction the use of cement stabilization mixed in place with existing pavement materials (recycling of milled material) is considered to be an economic and resource-saving approach. This paper describes the preparatory works required (inspection of the...
Roller Compacted Concrete as an Efficient Material for Road Pavement Construction
A study has been conducted in order to determine the influence of a wide range of factors on the properties of roller compacted concrete (RCC): coarse aggregate type and content, addition of fly ash, chemical admixtures type and quantity, technologies of manufacturing and compaction, tranportation time and concrete curing. The...
Concrete Recycling in Belgian Road Construction – Applications in Cement Bound Road Bases and Surfacings
For some years now the interest for the environment together with economic reasons, improvements of crushing plants and the definition of acceptance criteria have led in Belgium to an increased use of crushed concrete aggregate and sand in cement bound bases. Recent official circulars and tender specifications allow for the...
The Influence of Composition and Compaction on the Properties of Roller Compactcd Concrete
In many countries rullw cumpactod concrete (RCC) proved to be a success as a construction method for highly stressed industrial floors, for concrete pavements, subbases for concrete pavements and asphalt surfaces. Since 1993 the Research, Development and Consulting Department of tho Heidelberger Zement AG is attended with a research project...