APTech is experienced in all methods of pavement condition assessment, including visual inspections and pavement testing.
APTech conducts pavement condition surveys as part of its core services and has performed surveys on thousands of pavement facilities. APTech has extensive experience conducting roadway and parking lot surveys in accordance with various standards including ASTM D6433-03, Standard Practice for Roads and Parking Lots Pavement Condition Index (PCI) Surveys. APTech has extensive expertise with both portland cement concrete (PCC) and hot-mix asphalt (HMA) pavements and can recommend appropriate treatment options across a wide range of budget scenarios. APTech is experienced in both manual and automated condition assessment. APTech uses vehicles to perform automated data collection. This allows for much faster data collection that can be analyzed from a remote location. Additionally, because the data can be collected at normal driving speeds, the automated data collection does not impede traffic.
APTech owns and operates several pieces of equipment that are used as part of its construction inspection and evaluation services, including handheld computers for data collection, GPS cameras, a heavy-weight model falling weight deflectometer (FWD), a coring rig, and a portable seismic pavement analyzer (PSPA).
The FWD is able to simulate loadings ranging from automobile traffic on highways to the heaviest aircraft on large commercial airport runways. It is able to apply loads up to 55,000 pounds. FWD testing allows for the evaluation of multiple locations in a short period of time without disturbing the pavement structure.
APTech also owns and operates a trailer-mounted material sampling device that can be used to obtain core and auger samples of the pavement and subsurface layers. Samples obtained by the device can be tested in a number of ways to determine layer thickness, unit weight, strength, stiffness, and other intrinsic material properties.
APTech most recently added to its equipment the PSPA. The PSPA is a nondestructive testing device that measures the seismic modulus of concrete pavements. It also identifies transitions between asphalt lifts and changes in modulus depth. Using the PSPA, APTech is able to estimate thickness via the impact echo method.
The Illinois Department of Transportation (DOT) constructed mechanistically designed pavements in the early 1990s and monitored their condition until 2000. In 2010, the Illinois DOT desired to resume monitoring these pavements, and selected APTech to provide performance monitoring for approximately 1,150 miles of mechanistically designed pavement.
APTech conducted a records review of previous surveys performed on these pavements, then conducted distress surveys on approximately 1,150 miles of pavement. The data collected in these surveys was analyzed and entered into the Illinois DOT’s database, where it can be easily accessed and used to monitor the performance of the mechanistically designed pavements.
In 2012, an energy company made plans for pipeline construction across Indiana and Michigan, and a total of approximately 1,294 lane-miles of paved and unpaved roadways were being considered for use by contractors as haul routes for the construction. The energy company sought to document the condition of proposed haul routes prior to construction, for comparison with condition after construction to assess the impacts. APTech was selected to complete the assessment.
APTech provided a network-level analysis of the condition of the Michigan and Indiana roadways before and after construction of the new pipeline. The analysis used high-resolution images and rutting data provided by Mandli Communications, Inc. (collected under a separate contract), to assess damage on specific roadways in the pavement network, and to provide guidance on mitigation strategies where required. In addition to the network-level assessment, APTech conducted a detailed analysis at each pipeline/road crossing to determine whether isolated repairs were needed at those locations.
In 2013, an energy company began construction on the Flanagan South pipeline route, which reaches from Flanagan, IL to Cushing, OK. Approximately 3,600 lane-miles of paved and unpaved roadways may be utilized by the company's contractors as haul routes for the construction. The energy company sought to document the condition of proposed haul routes prior to construction for comparison with conditions after construction as a baseline to assess the impact of the increased traffic. For this purpose, APTech was contracted to perform a pre-construction and post-construction pavement condition assessment. APTech provided a network-level analysis of the condition of the haul route roadways before and after construction of the Flanagan South pipeline. The analysis measured PCI, ride quality, and rutting before and after construction to assess damage on specific roadways in the pavement network, as well as provide guidance on mitigation strategies where required.
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