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Browsing OU - Oklahoma Transportation Resources / Oklahoma Transportation Library by Author "Ahmed, Samir"
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Item Open Access Depressed transverse cracks in asphalt pavements in Oklahoma (FHWA-OK-91-__) 2159(1991-7) Snethen, Donald R.; Ahmed, Samir; Oklahoma Department of Transportation. Materials and Research Division. Office of Research & ImplementationTransverse cracking of asphalt pavements is a costly pavement distress occurring in states that experience cold/freezing temperatures during the winter months. The cracks are causedĖ by low temperature-induced tensile stresses that exceed the tensile strength of the pavement material. The majority of these cracks occur in the transverse direction relative to the pavement and with regular frequency along the roadway. The major objectives of this research included: 1. Determine the nature and extent of transverse cracking in asphalt pavements in Oklahoma. 2. Conduct a field and laboratory investigation of pavement m ateri als and highway features to determine and evaluate the various factors that influence transverse cracking. 3. Review ODOT practices for dealing with transverse cracking of asphalt pavements. The results of the research project confirm that the transverse cracking of pavements is a thermally-induced problem. Based on evaluation of collected data, the number of cracks increased and the average spacing decreased as the average low monthly temperature decreased. Depressions associated with transverse cracks were influenced by subgrade moisture conditions; specifically, as the average subgrade moisture content increased, the occurrence and severity of the depressions increased. Transverse cracking and particularly depressed transverse cracks appear to be more of a problem on fine-grained soil subgrades. Transverse cracking of asphalt pavements is a problem across the state of Oklahoma with severity of the problem varying from division to division based on such factors as pavement age, pavement cross section, traffic, asphalt properties, and maintenance procedures. Although maintenance and remedial procedures vary across the state, ODOT's procedures are consistent with those reported by surrounding states.Item Open Access Depressed transverse cracks in asphalt pavements in Oklahoma (FHWA-OK-92-1) 2166(1991-7) Snethen, Donald R.; Ahmed, Samir; Oklahoma Department of Transportation. Materials and Research Division. Office of Research & ImplementationTransverse cracking of asphalt pavements is a costly pavement distress occurring in states that experience cold/freezing temperatures during the winter months. The cracks are caused by low temperature-induced tensile stresses that exceed the tensile strength of the pavement material. The majority of these cracks occur in the transverse direction relative to the pavement and with regular frequency along the roadway. The'majbr objectives of this research included: 1. Determine the nature and extent of transverse cracking in asphalt pavements in Oklahoma. 2. Conduct a field and laboratory investigation of pavement materials and highway features to determine and evaluate the various factors that influence transverse cracking. 3. Review ODOT practices for dealing with transverse cracking of asphalt pavements. The results of the research project confirm that the transverse cracking of pavements is a thermally-induced problem. Based on evaluation of collected data, the number of cracks increased and the average spacing decreased as the average low monthly temperature decreased. De pressions associated with transverse cracks were influenced by subgrade moisture conditions; specifically, as the average subgrade moisture content increased, the occurrence and severity of the depressions increased. Transverse cracking and particularly depressed transverse cracks appear to be more of a problem on fine-grained soil subgrades. Transverse cracking of asphalt pavements is a problem across the state of Oklahoma with severity of the problem varying from division to division based on such factors as pavement age, pavement cross section, traffic, asphalt properties, and maintenance procedures. Although maintenance and remedial procedures vary across the state, ODOT's procedures are consistent with those reported by surrounding states.Item Open Access Depressed transverse cracks in asphalt pavements in Oklahoma phase I interim report (FHWA-OK-89-02) 2159(1989-5) Snethen, Donald R.; Ahmed, Samir; Oklahoma Department of Transportation. Materials and Research Division. Office of Research & ImplementationThi s report describes the results of a preliminary evaluati on of the nature and extent of depressed transversed cracking of asphalt pavements in Oklahoma. The primary purpose of the Phase I study was to develop and evaluate procedures for collecting field data on a larger scale in Phase II. Four sites were selected using input from Division Maintenance Engineers for detailed evalua tion. Data such as crack occurrence and distribution, crack crosssection, pavement crosssection, general topography, general soils were collected and evaluated. The results of the Phase I evaluation indicate that: 1. Transverse cracking of asphalt pavements is a prevalent problem in North Central Oklahoma. 2. The depressionsassociated with transverse cracks occur because of a combination of factors, including, at a minimum; the type of subgrade, the stiffness of the asphalt, and the size and number of vehicles. 3. The field procedure is used to collect test section data, although time consuming, worked very well .