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...
Use of Calcium Aluminate Cement in High Strength Concrete for Fast Repair of Old Concrete Slabs
Pavement Design Procedures for New Construction and Rehabilitation with Overlay
The first part of the paper deals with the designing of rigid pavements by means of FEM. The NE10-SOILIN program uses the NE-10 finite elements composed of subelement 2D NE-10-M (tetragonal element), subelement 3D NE-I013RJCK and subsoil element. It models the Midlins slab placed on a generally multilayer structure. Under...
Methods of Repair Headrace Tunnel Invert – Repair of Deteriorated Headrace Tunnel by Using Slip Form – Paver Method
In Japan, hydro-electrical power plants are existing at approximately 1,800 places, but more than a half of such plants have been used over sixty years since the commencement of operation. Water channels that lead water, taken in from head areas, to hydro-electrical power plants are called the "headrace tunnel." The...
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.
The Dutch Visual Inspection Method and Standards for Levels of Maintenance of Concrete Roads
In view of the evaluation of the Pavement Management System used in the Netherlands, this system will be made suitable for concrete pavements. Thcrefore two main elements of thp cyctem, the visual inspection method and standards for levels of maintenance for concrete pavements has been developed. The visual inspection method...
Whole Life Costing of Road Pavements The Way Ahead
This paper considers the role of whole life costing in the management process for the road network and explores the background to current interest in England. It describes the development of the computer model, COMPARE, for assessing the whole life costs of bituminous and concrete pavement options. The key components...
Compressive Stresses in Concrete Pavements and Related Maintenance Problems
The M20 motorway between Junctions 3 and 5 near Maidstone (UK) is an unreinforced pavement with joint spacings of 5m and 6m, comprising warping joints with contraction joints every 30m. The pavement was constructed at the beginning of the 1 970s. A contract for maintenance between Junctions 4 and 5...
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
Long-Time Observations of Contracfion Joint Opening in Concrete Pavements Measurement and Evaluation
Long-time measurements of contraction joint opening were performed during a 25-year period for several pavement systems [concrete full depth construction, concrete pavement on a temperature insulated, cement treated (CTS) and bituminous subbase]. The data obtained were analyzed and the mean opening of the joints, the standard deviation, the coefficient of...
The Asturias Motorway Balance of Its First 15 Years Under Traffic
The Asturias motorway, called «y» -asturiana, links the three most important cities in Asturias. It has 43 km of continuously reinforced concrete pavement and was built during 1974and 1975.The behaviour of the motorway up to now has been very good in spite of the rainy weather and the unfavourable geology....
Evaluation and Maintenance of the Concrete Pavements on the Mediterranean Highway
The Mediterranean Highway has been in service for more than fifteen years, and we can state that the performance of the concrete paving has been overall excellent whether referring to its surface characteristics or its structural characteristics, except for those areas giving support where damage has taken place. The modifications...
Load Transfer Restoration LCPC Freyssinet Connector
The LCPCIFREYSSINET slab connector is an innovating device allowing load transfer restauration of concrete roads submitted to pumping effects. It is constittïed by two synietrical half-shells in cast iron glued to a central elastomeric pad and contains an adjusted steel-pin which slides freely within housings machined in the shells, making...