Washed or fine brushed concrete was introduced in the Netherlands, replacing rough brushed concrete, to reduce the road noice. In many cases the minimum friction coefficient required was not reached. However, measurements carried out some months later showed an improvement of the results. To investigate if this improvement of the...
New Opinions in the Friction Problematic with Brushed Textures and Exposed Aggregates
Wheel Tracks the Compromise between Agricultural and Environmental Interests
Changes in society are giving rise to growing objections to surfacing any more sand roads. These objections are provoked by the interest in the environment, countryside and cultural history. On the other hand, agricultural developmont calls for continued mechanization in order to reduce production costs. This means, among other things,...
Concrete Wheel Tracks – The Ecological and Economic Alternative in Rural Road Construction
The changes in the landscape happened during the last 40 years due to human activity have produced a slow change of mind. Therefore it is no wonder that also for road construction nature is taken more into account. The Concrete wheel track is a compromise. Firstly it prevents from covering...
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...
Reuse of Alkali Damaged Road Concrete in Cement Bound Road Bases
Aggregates were obtained from an alkali-silica damaged concrete road slab aggregates and used for road base concrete with different kinds of cement (low alkali cement, high alkali cement). After analysing the samples produced with these mixes, which were exposed for up to one year to different hardening conditions, no alkali-silika...
Wear Resistant and Noise Reducing Concrete for Road Pavements
Rutting, depending on the wear of studded tyres, is a problem in the Skandinavian couritiis. Concrete pavements have a good wear resistance. In Ai.ustria they have recently developed a low noise concrete with small aggregate size and exposed aggregate. Earlier experiences have shown that the wear resistance of concrete is...
Noise Reducing Techniques on Existing Continuously Reinforced Concrete Pavements on Belgian Motorways
Most of the Belgian Motorways, with a concrete pavement, have a deeply grooved concrete surface. Although those wearing courses have a very good skid resistance, there is a great concern about the noise pollution. Not only noise barriers and the porous asphalt overlay, but recently also the grinding are an...
Low Noise Concrete Pavements in Germany
Noise protection has been a main concern in Germany for a long time. The contribution of the road surface to the reduction of traffic noise is recorded with correction values and taken into consideration in noise protection calculations which are legally significant in the planning and construction of roads. These...
6th International Symposium on Concrete Roads 1990 Madrid Spain
Session Paper Indexes, Opening Addresses, General Reports, Oral Contributions and Closings from the 6th International Symposium on Concrete Roads 1990 Madrid Spain
Some Theoretical and Practical Aspects of the Use of Fly Ash in Lean Concrete
Until a few years ago, interest in the incorporation of fly ash into lean concrete was rather limited. A study conducted in the laboratory has demonstrated some of the advantages of the technique and shown that the optimum dosage is of the order of5 %. In Belgium, mixtures of this...
Lime-Cement Stabilization of Wet Cohesive Soils
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...
Economic Analysis of Cement Fly Ash Bound Materials
In order to design a cement bound mixture for use in base/sub-base pavement layers, it isusually re-quired to obtain a certain minimun strength value.Ifonly one type of binder isused, the problem hasonly one restriction and one variable, so, one onlysolution. However, if more binders are added tothe mixture, asit happens...