The joint system presented herein takes advantage of the natural development of shrinkage in concrete to induce the formation of joints along the projections of previously placed system devices. Such system induces in an in-situ concrete pavement an efficient interlocking indentation among the slab elements resulting from the shrinkage phenomenon....
Concrete Pavement Without Dowel Bars
Constructing High Performance Concrete Pavements Using the FHWA Hiperpav Systems Analysis Software
Sponsored by the U.S. Department of Transportation, Federal Highway Administration, HIPERPAV (HIgh PERformance concrete PAVing) is a software tool capable of predicting the early-age behavior of concrete pavements. HIPERPAV successfully integrates materials, pavement design, climate, and construction operations into an easy to use Windows-based software package. Using a systems approach,...
Effect of Curing on Strength and Chloride Penetration into Concretes Made with Portland and Blast Furnace Slag Cements
In this paper, portland cement concretes and concretes with blast furnace slag cement were studied to determine the parameters for strength and chloride permeability under different curing procedures. For this purpose, four concrete mixtures were made at two different water cement ratios of 0.45 and 0.65 with cement contents of...
Reconstruction of a Cement-Stabilised Fly-Ash Road-Base
In 1999 - in the province of Noord-Brabant in the Netherlands - an eighteen-year-old asphalt road with a cementstabilised fly-ash road-base, appeared to be in bad condition. Further investigation showed that the base was almost completely disintegrated, probably due to bad drainage and due to a possibly low cement content....
Study on Perfectly Bonded Ultra-Thin Whitetopping
Ultra-thin whitetopping is a repair method using concrete for asphalt pavement, whose primary characteristic is to allow the existing asphalt pavement and concrete to perform monolithically as a composite section. The existing asphalt concrete is normally milled to achieve such a bond, but milling can reportedly cause debonding of asphalt...
Measuring Device For Determining Dowel Positions on Concrete Slabs
and to secure the height position of the individual slabs. They must be positioned in the middle of the slab thickness so that they do not prevent longitudinal motion of the slabs. In modern concrete pavement construction the concrete is poured over the entire cross section width using slip form...
Comparative Investigation on Concrete Pavement Thickness Using Industrial Waste Chips, Steel Fiber and Silica Fume
Application of steel fiber in concrete would increase modul of rapture (MR) and module of elasticity (E), which in turn decrease slab thickness in rigid pavements. Hence, damaging stresses due to thermal and moisture is reduced. Where as concrete mixes with Silica Fume (SF) would perform the same behavior with...
Rapid Replacement of Deteriorated Concrete Slabs Under Traffic
In the course of utilization the utility value and condition of concrete pavements decreases due to traffic and environmental burden. Their utility value is judged by edge/corner demolitions, settlements, horizontal movements and the overall condition. In case of damage individual slabs must be replaced. The aim of this study is...
The Use of Statistical Experimental Design to Investigate the Autoclave Curing and Standard Curing of Cement
28 day compressive strength of Portland cement mortar was investigated for standard curing and for autoclave curing. The effects of %C3S, %SO3 and Blaine on strength development in both curing methods are compared via the use of statistical experimental design techniques. Box-Behnken response surface methodology was adopted to create a...
Analysis of Cracking Mechanisms in Concrete Pavements and Related Recommendations For Pavement Construction
In addition to the stresses caused by traffic loads concrete highway pavements may be subjected to considerable stresses due to environmental action effects and other related damaging mechanisms such as early age shrinkage, loss or absorption of moisture, temperature induced strain gradients and in some instances also alkali-silicareactions. Due to...
The Effect of Moist Curing on the Properties of Concretes Made by Pozzolanic Cements
The strength development and permeability properties of two concretes prepared with natural pozzolanic cements, Trass Cement (TC) and Blended Cement (BC), were investigated and compared with those of an Ordinary Portland Cement (PC) concrete under varying water-curing periods. The mix design of concretes was made with an equal strength base...
Surface Platforms For Public Transport New Perspectives: the Case of Cement Concrete
As a result of Urban Travel Plans implemented in major cities, public transport is being favoured as a convenient means of travel and mobility by all. Platforms (road- and trackbeds) designed for public transport must offer quality from the technical standpoint in order to handle channelled loads or the insertion...