The paper presents the influence of friction between layers on surface detlections of rigid composite pavement structures. Pavement structures were analysed using BISAR Programme and non- destructive testing technique under different bonding conditions between the asphalt and the concrete layers. The analysis of the data involves the use of hack-calculation...
Surface Texture of Roller Compacted Concrete Pavement
An iiiteiisive iesearch on roller compacted concrete pavement for high speed roads has been conducted in China since the beginning of this decade. Many technical reports document that the surface of RCCP is smooth due to the effect of the roller, and texturing such dry and less workable material is...
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....
Processes of Structure Formation and Properties of Cement Stone with Polymer Additives and Disperse Reinforcement for the Repairs of Road Pavements
The addition of special polymer additives and dispersc reinforcement can improve the physicomechanical properties of cement stone being used in road construction.
Use of Roller Compacted Concrete in Road and Airport Pavement Construction in Sri Lanka
In the quest for introducing materials and techniques of construction, the Research & Development Division of the Road Development Authority, Sri Lanka has carried out several trials and successfully constructed an airport apron, a causeway of 2km length using Roller Compacted Concrete (RCC) pavements and a road of length 0.265km....
Effectiveness of Load Transfer in Jointed Reinforced Concrete Pavement
The load tiansfer due to the dowel bars in jointed reinforced concrete pavements (JRCP) or to the steel reinforcing in continuously reinforced concrete pavements (CRCP) has also the effect of reducing the stress on the edge of the load slab. Therefore, the calculation of the load transfer between contiguous slabs...
Experiences on the Non Destructive Testing Directed at the Weak Point in the Semi-Rigid Pavement on the A-92 Dual Carriageway
The nondestructive testing for bearing capacity of semi-rigid pavements must be similar to the rigid pavements one. So the nondestructive testing of the transversal cracks, the weak point, is the best way to do it.
Thin White Topping in Vienna
Conventional maintenance of rutted asphalt roads means resurfacing in short intervals or substitution of thick layers. Therefore, a new repair method was tested: Milling the top of the existing asphalt pavement, cleaning the surface and plaeing a dan layci of high performance concrete. The behaviour of the composite structure was...
Use of Calcium Aluminate Cement in High Strength Concrete for Fast Repair of Old Concrete Slabs
The oxides present in the chemical compositioii of calcium aluminate cement, especially monocalciiim aluminates. is what gives the concrete manufactured with this type of cement its slow setting, quick hardening properties. The products generated during hydration of anhydrous phases in calcium aluminate cement. will depend on ambient conditions at the...
High-Quality Concrete with Recycled Aggregates
New laboratory and field investigations showed that it is possible to achieve durable concrete by using recycled aggregate above 4 mm from old pavements with cracks but no frost- or concrete structure deterioration. The concrete compressive and tensile strengths were slightly higher and the cracking sensitivity was slightly lower for...
Computer Aided Design for Flexible Pavements of Concrete Bricks
This paper describes computer aided design (CAD) software and methods employed for effective design of flexible pavements with concrete bricks. Pavements consisting of concrete bricks allow many different patterns to be used. An area which is to be paved with concrete bricks is divided into a number of subdomains which...
Materials Mix Design and Quality Control
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...