When treated with lime, wet cohesive soils granulate and be-ome more workable, thus allowing easier subsequent incor-oration of cement.'he effects of pregranulation with lime on various aspects ofement stabilization were investigated: compaction. CBR bear-19 capacity, strength values, durability, the effects of differentariables such as density and moulding moisture content. Theitter...
Study of Long-Lasting Materials and Conventional Paints on Concrete Surfaces
Due to the increase of concrete use in road cons-truction, the report examines the influential fac-tors on the three most important properties in roadmarking, above all on concrete pavements.The analysed properties are:- Night visibility.- Day time visibility.- Skid resistance.The study makes a comparison of two systems:two components system (plastic of...
Characterization by Means of Some Fracture Mechanics Parameters of the Concrete Pavement of the By-Pass Between Al and A2 Italian Highway
This work reports the results obtained with the three point bend tests (TPBT) carried out on beams made up of the concrete used for the construction of a by-pass highway and, by comparison, of medium (50 N/mm2) and high strength (98 N/mm 2) laboratory concretes. Typical parameters of fracture mechanics,...
Dynamic Deflection Measurement on Rigid Payements Using the Falling Weight Deflectometer
Deflection caused by a load is an important measure for the bearing capacity of rigid pavements, too. For this reason the deflection on a variety of sections with different constructions has been measured in the Federal Republic of Germany. For these measurements the «Falling Weight Deflectometen> was used, developed by...
Pavement Rehabilitation. Tools That Work
A nation's highway system is an investment used to transport manufactured goods and farm products. The challenge in maintaining this transportation system has been devising a cost-effective rehabilitation method as an alternate to the «bandaid » cover up. This paper describes the six steps of concrete pavement restoration plus two...
Developments in Australian RCC
Australia has now over three years of experience in the use of high strength RCC in pavements with over 40 projects completed. Whilst the majority of Australian projects have been relatively small in comparison to American and European experience, nevertheless they have enabled a continued development of design, construction and...
The New Spanish Standard on Pavement Design
The General Highway Plan (1984-1991) currently under execution has prompted an overall update of the specifications, in order to take into account the past experience, the new materials and the traffic evolution since 1975. In general, internally vibrated portland cement concrete pavements (PCCP) for heavy traffic have transverse joints every...
Aspects of Mechanistic Analysis of Lightly Cementitious Pavement Materials
Inthispaper compressionfailureasa resultof traffic loading in lightly cementitious pavement ma-terials is discussed. The investigation was donewith the aid of mechanistic analysis, and includesboth surface and depth deflection measurementson an actual pavement from which linear elasticmoduli values were backcaIculated. This wasdone to evaluate the «actual» stresses between therelatively thin surfacing and...
Optimizing the Surface Texture of Cement Concrete Roads
The growing concern about the influence of the road surface on traffic noise raises the problem of reducing the noisiness of cement concrete roads whilst keeping high skid resistance values. Studies on various aspects of tyre/road interaction con-ducted in the past ten years at the Belgian Road ResearchCentre provide basic...
The Passage of State Roads Through Built-Up Areas. Applications of Concrete Block Pavements
In the eighties, a campaign was set up in Belgium in view of the rearrangement of the state road sections which are passing through built-up areas. These projects were meant to improve the road safety and the viability along these cross town links. Efforts were made to come to a...
Long Term Performance and Economic Aspects of Concrete Roads in Austria
Austria has more than 30 years' experience in concrete road construction. Half of the approximately 650 km of motorways with a concrete pavement are more than 20 years old. 40/0have already been reconstructed, some 14% will have to be reconstructed within the next 5 to 10 years. The remainder is...
Rapid Rehabilitation Techniques with Cement Concrete_ Applied on Deformed Asphaltic Roads
On asphaltic roads the so called «wash-boardeffect » in front of traffic lights is a well known phenomenon. Regular reconstruction of these areas places a significant and recurrent burden on road managing authorities. Because of the large volumen of traffic at these intersections repair works also lead to a huge...