APTech is experienced in all methods of pavement condition assessment, including visual inspections and pavement testing for clients ranging from small general aviation airports to large-hub airports and Air Force Bases. APTech regularly accommodates the busy schedules of airports by performing night work and remaining responsive to the scheduling needs of the client.
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 airfield surveys in accordance with various standards including ASTM D-5340-11, Standard Test Method for Airport Pavement Condition Index Surveys. APTech not only uses this specification but was instrumental in the 2010 and 2011 updates to it. The 2010 update incorporated a new distress type for alkali-silica reactivity (ASR) for portland cement concrete (PCC) pavements and split weathering and raveling into two distresses for hot-mix asphalt (HMA) pavements, while the 2011 update corrected a calculation when combining multiple distresses of varying severity levels. APTech has a representative on that ASTM committee and provided valuable insight into these changes from a user’s standpoint.
The FWD is able to simulate loadings ranging from light, single-engine aircraft 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 has used this sampling technique to diagnose subsurface causes of deterioration for airport pavements when surface observation could not.
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 Houston Airport System (HAS) implemented an asset management strategy to maintain its pavement infrastructure as efficiently and effectively as possible. As part of this strategy, HAS selected a firm to complete several comprehensive asset condition assessments in 2013. APTech was selected as a subcontractor to take advantage of the firm's extensive APMS experience. This project involved concurrent efforts at all three HAS airports and the management of large volumes of high-accuracy pavement data, structural, and other data was integrated into the HAS databases.
APTech's role included updating the APMS for the airfield pavements at Houston Bush Intercontinental Airport and Houston Hobby Airport. APTech mapped pavement distresses on the runways and taxiways at both airports. APTech also performed FWD testing at Houston Hobby Airport and developed Pavement Classification Numbers (PCNs) at both airports. APTech used the results to develop maintenance and rehabilitation (M&R) recommendations for the runways and taxiways at the airports. APTech was also able to assist in the delivery of business process recommendations to HAS for more efficient management of airfield assets in the future.
Burlington International Airport, a public airport owned by the City of Burlington, the largest city in Vermont, serves over one million passengers annually. In 2003, Runway 15-33 was exhibiting reflective cracking through a hot-mix asphalt (HMA) overlay, which sparked the Airport’s interest in performing a detailed pavement investigation to determine the cause and extent of the problem and to develop recommendations to prevent ongoing problems. APTech provided a detailed pavement evaluation to assess the problem and develop short- and long-term recommendations.
As a subconsultant, APTech evaluated the existing pavement structures, developed alternative pavement designs, and recommended a rehabilitation strategy. The pavement evaluation included performing a project-level pavement condition survey in which all pavement distresses were mapped, conducting FWD testing, and completing coring and boring operations. Although the pavement condition suggested that routine maintenance could be performed to address the cracking, evaluation of the coring results indicated failure of the bond between the pavement layers and the fiberglass grid placed to control reflective cracking.
In 2006, APTech conducted a life-cycle cost analysis (LCCA) of the previously determined pavement designs, including reconstruction designs, overlay designs, and combinations of the two. In 2009, APTech provided recommendations on addressing reflection cracking concerns for the portion of the runway to receive a HMA overlay, input on construction feasibility and phasing, and a validation of previously developed pavement designs based on new design inputs. In addition, APTech provided assistance with design details, including joint details for the portland cement concrete (PCC) runway ends and pavement transition areas. In 2014, APTech, as a subcontractor, provided pavement design assistance with the goal of minimizing or avoiding ASR in the new pavement. To meet this goal, APTech is investigating the past performance and suitability of locally available aggregates and cement, developing specifications to improve aggregate durability, and providing construction assistance as needed.
Since 2005, APTech has been on a short list of on-call consultants providing management services to the Port Authority of New York and New Jersey (PANYNJ). In 2013, PANYNJ contacted APTech to inspect Runway 13R-31L at John F. Kennedy International Airport. The transverse and longitudinal joints of the runway were sealed at construction with approximately 200,000 LF of preformed neoprene joint sealant. PANYNJ was interested in identifying an inspection protocol and completing an inspection to estimate the extent of sealant performance problems. APTech was selected to complete these objectives.
APTech conducted an extensive review of the in-place sealants – including measurements of bond, depth, and condition – to estimate their future performance. The results were summarized in a report documenting the evaluation findings and recommendations for action.
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