Materials

The property of abrasion resistance is the ability of a material to resist mechanical abrasion. This paper deals with different test methods, especially road wear simulators, requirements and influencing factors for wearresistant road surfacing concrete. The average annual daily traffic (ADT) adjusted for the proportion of traffic with studded tyres,...

After the exploration of damages caused by alkali-silica reaction (ASR) on highway bridges in Turkey recently, the usage of reactive aggregate on highway construction was prohibited. However, this does not seem to be the proper solution, because natural aggregate leads to an increase in workability of concrete due to its...

When crushing stones of different calibres, quarries produce a large amount of sand, referred to as crushed sand. This material is often considered as a by-product and its use is reserved for less noble applications than road foundation. However, when stabilised with cement, this sand has very interesting properties and...

To complete the road between La Teste town and the famous , the Gironde Regional Council use the knowledge and experience requied during the national research and development project on sand concrete named SABLOCRETE to build a sand concrete slab pavement structure along 3,5 kilometres. The owners and engineers of...

Precast concrete pavcmrnts have the merit to supply concrete slabs of good quality. In the concstructiori of precast concrete pavements, it is not necessary to use any special machines. And the special merit is that traffics can open immediatly because of unnecessary of curing. So this type of concrete pavement...

Porous concrete is mainly used to prevent problems of water stagnation between a concrete pavement or a block paving surface and the base. In the new tender specifications SB 250 of the Flemish Region, requirements concerning porous concrete have been introduced, in particular • a percentage of voids of between...

The paper presents a general principle for the determination of the k-values for fly ash concrete and the results obtained on concretes with cement contents of 200, 300 and 400 kg/rn 3, fly ash cement ratios of 11%, 25%, 43%, 67% and 100% and equal slump of 30 mm. The...

There have been significant developments in concrete road pavement techniques in the past decade. To the traditional advantages of concrete pavements such as durability under heavy traffic and low maintenance cost have been added various other reasons for favouring them, such operational availability, aesthetics, architectural integration and contribution to a...

High performance concrete - HPC - is characterised by high strength and considerable durability under high service load. In highway construction these concrete is used to constructing and very rapid repairs of pavements, bridges, viaducts and tunnels. Differentiation in types of such objects as well as erection conditions and than...

In Portugal, fly ash is often used as a cement replacement material on concrete for road pavements. The percentages of replacement generally range from about 30% in the top pavement layer up to 50% in the bottom layer. A study was carried out for evaluating to what extent such amounts...

Since 1993, tliiee experimcntal test sections have been built in Mexico to study the performance of Ultra-thin Whitetopping (UTW) under different traffic conditions. In this paper, the construction, instrumentation and load testing of an UTW test section built on a major highway is described. Based on the experimental results, UTW...

The durability of different kinds of cement i.e. PC 45 and PC 55, slag cement (SC) and alkali activated slag (AAS) has been investigated. The mortar were cured in a strong chloride solution and the expansion and strength were measured. Additionally, the frost resistance was tested according to ASTM Standard....