Usage of recycled concrete aggregates produced from crushed demolished concrete has been limited due to its higher cost and the difficulty caused from its major ingredients, cement mortar, and by-product powder. However, the exhaustion of aggregate resources and increase demand of preserving the natural environment require developing an effective application...
Roller Compacted Concrete Pavement Using Recycled Concrete Aggregate
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...
Life Cycle Cost of Urban Pavements
This paper attempts an actual analysis of the cycle cost of urban pavements through the discussion of a case study: the City of Buenos Aires, Argentina. Three frequent paving solutions for the local street system are compared: plain concrete and two different asphalt alternatives. Construction, maintenance, reconstruction as well as...
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...
Fundamental Study on Bonded Ultrathin Whitetopping
Ultra thin white topping is a rehabilitation technique in which thin concrete overlay is placed on asphalt pavement in distress, and this work technique has been under research in Europe, USA and other countries. In this study, a small model experiment was conducted to see its applicability to the roads...
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...
High Performance Porous Concrete for Road Traffic
This report details the construction of a 300 m long experimental section of road for heavy traffic in Villamayor, Salamanca, Spain, using "high performance porous concrete" (HPPC). HPPC is made with the same materials as conventional compact concrete (Ccc), i.e. cement (two types have been used for this project), coarse...
Stiff Concrete Paving on Minor Road Systems – Results of a National Inquiry About Mountain Roads
Our investigation was aimed at obtaining information on the road pavements of several mountain road systems subjected to limited traffic and leading to sheep-farming settlements or woodland areas managed by local mountain consortia (Mountain Communities, CM). Steeper car-track sections were found to be paved in concrete to prevent vehicles from...
FEM Analysis on the Dynamic Behaviour of Concrete Road Superstructures
As a general rule procedures for the sizing of road superstructures only refer to static stress. Possible dynamic effects induced by loads are introduced by amplifying their intensity or by considering the dynamic modulus of the materials. Under variable stress in time, the real behaviour of a superstructure is remarkably...
The Use of Nuclear Gauges on Concrete Roads Under Construction
To ensure the satisfactory performance of rigid pavements, it is necessary to control the air content of the concrete slabs. The aim is to maintain a prescribed quantity of cntraincd air in surface slabs to rcducc frost damage. Also, it is required to minimise the quantity of air, which results...
Use of Superplasticized Fiber Reinforced Concrete in the Construction of Pavements
Fibre Reinforced Concrete (FRC) by itself has opened up a new era in the field of Civil Engineering. FRC has given altogether a new dimension to concrete technology. It is even difficult to imagine that just the addition of fibres into concrete mass can change the entire properties of concrete....
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...