During the past two decades, the practice-oriented research work done when concrete roads are built has lead to further development of slab construc-tion, to new solutions to individual constructio-nal problems, and to development of new cons-tructional methods. Based on existing research re-sults, more reliable statements can be made on thedegree...
Highway Liquid Sealants a South African Perspective
This paper presents aspects of liquid sealant installation and behaviour in joints in concrete roads under South African con-ditions. It covers joint preparation, installations techniques,quality control and field testing. A description of the generictypes of liquid sealants is given as well as behaviour charac-teristics obtained from laboratory tests which included:...
Concrete Continuously Reinforced with Flat_ Slotted_ Galvanised Steel Strips. Experience of FLEXARM Reinforcements. French Road Network 1986-1989
The dream of concrete pavement constructors, to replace the conventional difficult-to-fix reinforce-ments, which require a considerable manual work-force, with a continuous bobbin-wound reinforce-ment, has today become a reality. The chosensolution was a weldable carbon steel, with an elas-ticlimitgreater than 700MPA, a rectangular cross-section 40 mm x 2 mm, slotted for...
Setting New Standards in the Construction of Flight Operation Areas in MUC 2
The construction of the International Airport MUC 2 and especiallyof the flight operation areas in -for road designers- gigantic dimensions and short time-limit was a unique chance for the ex-perts to search for and find newstandards for tech-nique, economy and quality by an innovative fur-ther development of proven equipment and...
A Contribution to the Study of Joints on Concrete Pavements
vlaterials used as joint sealants on concrete pavements are zenerally classified in: - Preformed sealants. - Field molded sealants. l'his work shows the demanded characteristics for preformed .ealants and field molded sealants. The last ones are divided in :wo types: thermosetting -two component systems- coldap-rlied, and thermoplastics --one component- bot...
Concrete Paving in the UK One Contractors Experience and Approach Since 1983
dfred McAlpine Construction Ltd have constructed 20 kilometres of concrete carriageway using slipform pavers; 00 kilometres of which have been completed since 1983. This aper sets out the philosophy and experience of this firm with egard to the construction since 1983. It highlights the decision laking processes undergone at tender...
The Influence of Dowel Deviation on Concrete Paving Slabs
A series of tests have been carried out to figure out the in-fluence of deviation of the dowels on concrete paving slabdowels with respect to slab movements through shrinking andthermal variations.The stresses produced in the slabs for various deviations withrespect to the theoretical position and according to the systemchosen to...
Moisture Effects on the Bahaviour of PCC Pavements
Results of immersion-drying laboratory lest on pavement con-crete pieces show that tbe deformations produced by internalmoisture variations are as important as those produced bytemperature changes. Indirect measurements of internal mois-ture in actual pavements demonstrate the predominant existenceof a moisture differential between the slab surface and bottom.The resulting upward warping in...
The New Spanish Standard on Pavement Design
The General Highway Plan (1984-1991) currently under execution has prompted an overall update of the specifications, in order to take into account the past experience, the new materials and the traffic evolution since 1975. In general, internally vibrated portland cement concrete pavements (PCCP) for heavy traffic have transverse joints every...
New Design Method and Fatigue Analysis of Rigid Pavements with Variable Thickness
A new process for the structural plate analysis has been presented that is based on the condition of stationarity of total complementary energy (equilibrium model) instead than on the condition of the stationarity of the total potential energy (con-gruence model) as usually done. Each of the two processes, asregards to...
Restraint Stresses in Young Concrete Pavements
Under adversè conditions, the restraint stresses of young concrete pavements can cause the forma-tion of random cracks. In order to determine theparameters which influence the formation of thesestresses a full-scale experiment including sixdifferent test sections was performed. The experi-ment showsthe greatinfluenceof climaticconditionsin the days after placing the concrete. The analy-sis...
Assessment of Piarc Recommendation on the Combatting of Pump Inc in Concrete Pavements
Within the PIARC Concrete Roads Technical Committee,ninecountrieshaveworkedout a common platform of recommendations for improving the longterm performance of concrete pavements by implementing appropriate design provisions, draining of interface infiltration water, use of low-erodability subbase materials, optimized drainage,and surface waterproofing. Some countries hadalready applied all or part of these design provi-sions...