Breaking And Seating Of Portland Cement Concrete Pavements Prior To Bituminous Concrete Overlays In Kentucky PDF Download
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Total Pages | : |
Release | : 1985 |
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Download Breaking and Seating of Portland Cement Concrete Pavements Prior to Bituminous Concrete Overlays in Kentucky Book in PDF, ePub and Kindle
Author | : E. B. Drake |
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Total Pages | : 22 |
Release | : 1988 |
Genre | : Pavements |
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Download Pavement Rehabilitation by Breaking and Seating Existing Portland Cement Concrete Pavement Prior to Bituminous Concrete Overlays Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 31 |
Release | : 1992 |
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Download User's Guide: Cracking and Seating of Portland Cement Concrete Pavements Book in PDF, ePub and Kindle
Asphalt concrete overlays of a jointed or cracked portland cement concrete (PCC) pavement can develop reflective cracking because of either horizontal or vertical movement of the PCC. One method that can be used to reduce reflective cracking is to crack and seat the PCC prior to placement of the asphalt concrete overlay. The description, applicability, benefits, limitations, costs, recommended uses, and location of demonstration sites for cracking and seating technology are discussed.
Author | : Marshall R. Thompson |
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Total Pages | : 52 |
Release | : 1989 |
Genre | : Technology & Engineering |
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Download Breaking/cracking and Seating Concrete Pavements Book in PDF, ePub and Kindle
This synthesis will be of interest to pavement designers, maintenance engineers, and others interested in reducing reflection cracking of asphalt overlays on portland cement concrete (PCC) pavement. Information is presented on the technique of breaking or cracking of the concrete pavement into small segments before overlaying with asphalt concrete. Asphalt concrete overlays on existing PCC pavements are subject to reflection cracking induced by thermal movements of PCC pavement. This report of the Transportation Research Board discusses the technique of breaking/cracking and seating of the existing PCC before an overlay as a means to reduce or eliminate reflection cracking.
Author | : Lenford N. Godwin |
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Total Pages | : 16 |
Release | : 1986 |
Genre | : Concrete |
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Download Cracking and Seating of Portland Cement Concrete Pavement Prior to Asphalt Concrete Overlay Book in PDF, ePub and Kindle
Author | : John B. Wojakowski |
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Total Pages | : 32 |
Release | : 1995 |
Genre | : Pavements |
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Download Cracking, Seating and Overlaying of PCC Pavement Book in PDF, ePub and Kindle
In the fall of 1984, the Kansas Department of Transportation constructed a project involving cracking, seating, and overlaying a portland cement concrete pavement. The project is located in Wyandotte County on K-7 highway, north of K-32. This project is on the west side of the Kansas City metropolitan area. Eight experimental sections and one control section were stipulated for this project. One section of regular construction was selected for the control section. Four of the eight test sections were designated to be cracked at 0.9 m (3 ft) centers, and the other four were cracked at 1.5 m (5 ft) centers. One half of each spacing pattern was saw cut at the quarter points of the 18.7 m (61.5 ft) panels [approximately 4.6 m (15 ft) spacing, minimum 127 mm (5 in.) deep, maximum 13 mm (0.5 in.) wide] prior to cracking. Four sections had minimal joint repair; four had normal joint patching. There have been no easy determinants as to why the transverse cracking is low in some sections, and high in others. In some years it appears to be one factor, but the next year the factor has appeared to change. After 10 years there is no difference attributable to the cracking spacing, probably because both spacings are too large to adequately distribute the thermal movements. Slightly better performance was noted in sections that have minimal joint patching. More recent projects have used rubblizing as a rehabilitation technique. These have not shown significantly better performance than the cracking method. More investigation needs to be done to quantify the effect of various components that are used in this technique.
Author | : Daniel Okpala |
Publisher | : |
Total Pages | : 50 |
Release | : 1997 |
Genre | : Concrete |
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Download Rehabilitation and Evaluation of Distressed Portland Cement Concrete Pavement Book in PDF, ePub and Kindle
Author | : Issam Minkarah |
Publisher | : |
Total Pages | : 120 |
Release | : 1995 |
Genre | : Pavements |
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Download Effectiveness of Breaking and Seating of Reinforced PCC Pavements Before Overlay Book in PDF, ePub and Kindle
Author | : Kenneth H. McGhee |
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Total Pages | : 52 |
Release | : 1975 |
Genre | : Pavements |
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Download Efforts to Reduce Reflective Cracking of Bituminous Concrete Overlays of Portland Cement Concrete Pavements Book in PDF, ePub and Kindle
Studies of efforts in Virginia to reduce the incidence of reflection cracking when portland cement concrete pavements or bases are overlayed with asphaltic concrete are reported. The methods of reflection crack reduction discussed are: (1) The use of sand as a bond breaker between portland cement concrete pavements and asphaltic overlays, (2) the use of a high tensile strength fabric as a stress relieving layer between two asphaltic concrete overlays of an old portland cement concrete pavement on a weak subbase, and (3) the use of two types of fabric as stress relieving layers between asphaltic layers and a concrete base on a very strong subbase and subgrade. The following conclusions were drawn. 1. Neither sand as a bond breaker nor high strength fabrics as stress relieving layers are effective in reducing reflection cracking where vertical joint movement (differential deflection) is a significant factor. 2. When differential deflections are greater than about 0.002 in (0.05 mm) reflection cracks form early. Such cracking is delayed for lower differential deflection but may occur as the magnitude and frequency of wheel loadings increase. 3. Both an asphalt impregnated polypropylene fabric and an unwoven, spun-bonded nylon fabric, when placed to span joints in portland cement concrete base and covered with an asphaltic concrete, overlay, are able to sustain the formation of reflection cracking in the overlaying layer without undergoing damage. 4. An asphalt impregnated polypropylene fabric spanning the joints in portland cement concrete pavements, and placed between the pavement and an asphaltic overlay, may be effective in reducing the infiltration of surface water to pavement sub-layers. There is some evidence that pavement pumping may be reduced by this method. 5. Both an asphalt impregnated polypropylene fabric and an unwoven, spun-bonded nylon fabric can delay the formation of reflection cracking. There is strong evidence, however, that such cracking is fatigue in nature and will eventually develop under the application of repetitive wheel loadings.
Author | : Kenneth H. McGhee |
Publisher | : |
Total Pages | : 32 |
Release | : 1992 |
Genre | : Pavements, Concrete |
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Download Construction of a Thin-bonded Portland Cement Concrete Overlay Using Accelerated Paving Techniques Book in PDF, ePub and Kindle
The report describes the Virginia Department of Transportations' first modern experience with the construction of thin-bonded Portland cement concrete overlays of existing concrete pavements and with the fast track mode of rigid paving. The study was conducted in cooperation with the Federal Highway Administration (FHWA) and used a paving mixture verified in an FHWA mobile laboratory. The study showed that the fast track mode will permit lane closure times as short as 48 hours. Of special interest was the finding that adequate strength of the bond between the old pavement and the overlay is not dependent on the use of a bonding grout.