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...
Very Thin Bonded Cement Concrete (VTBCC) a New Quality Surfacing
Application of High Performance Concretes in Highway and Traflic Infrastructure Construction
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...
Influence of Fly Ash on Abrasion Resistance of Concrete for Roads Pavements
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...
Utra-Thin Whitetopping Applications in Mexico
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...
Some Aspects of Chloride Corrosion of Cement Paste and Mortar
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....
Verification of the Acting of the Recycled Building Material for the Production of Rigid Pavements in Concrete of Portland Cement
The objective of the present work is the study of the technical viability of the use of refused material of building construction like aggregates for concrete roads. The first stage consisted of the physical characterization of the aggregates obtained through the grinding, followed by a study of the granulometric composition...
Implementation of Ultra-Thin Whitetopping in Florida
In 1996, the Florida Department of Transportation (FDOT) started a research project to evaluate design, construction and performance of the ultra-thin whitetopping on asphalt pavements. Three UTW test tracks were constructed at the FDOT research facility in Gainesville, Florida. The design of the UTW test tracks included thicknesses ranging from...
High-Strength Concrete for Road Pavements Netherlands 141
The last decade, the technology to design concrete mortars with a high compressive strength have evolved tremendously. The strength of concrete has progressed upto strength values of 130 Mpa. The development of high strength concrete can give the traditional pavement construction techniques a new impulse. Due to the relatively short...
Why Should Bituminous Layers Be Used Over Portland Cement Bridge Decks
The purpose of this paper is to bring to the attention of the highway community in Portugal, a methodology that allows the construction of bridge decks with Portland Cement surfaces without the need to use bituminous surface layers. This paper will present construction methods, cost benefit analysis, some of the...
Whitetopping and Ultra-Thin Whitetopping – the US Experience
Concrete overlays of existing asphalt pavement, referred to as "whitetopping," is one of the most rapidly emerging technologies for rehabilitating pavements in the U.S. Although its use can be traced back to 1918, conventional (or classical), whitetopping became routinely used in the mid-1970's with use significantly increasing in the 1980's...
Possibilities of Quality Determination of Concrete Surface Layers
Possibilities of applying methods of surface absorption, mercury intrusion porosimetry, pull-off strength tests and thermal analysis in the assessment of the state of the surface layer of a concrete airport runway are given. The results of the tests of properties of differently deteriorated surface layers of concrete in an airport...
Method to Establish the Porosity – Depth Distribution of Porous Concrete Pavements Using Cylindrical 100 Cml Cores Samples
The paper deals with a low cost method to establish the porosity - depth distribution in porous concrete pavement using cylindrical 100cm cores samples. The outcome is a graph representing the porosity in function of the depth below the surface. The method is non destructive with regard to the core...