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1. Improved Laboratory Testing Protocol and Full-Scale Evaluation of Rapid-Setting Cementitious Repair Products for Airfield Repairs.

Author

Carruth, William D., Ramsey, Monica A., Falls, Anthony J., Rutland, Craig A., and Tseng, Ester

Subjects
TRANSPORTATION management, AIR travel, FOREIGN bodies, FLEXURAL strength, CIVIL engineering
Abstract

Many transportation management agencies require premixed rapid-setting cementitious repair products that can be easily mixed and placed to return airport and roadway facilities to service and prevent downtimes. The US Air Force Civil Engineer Center oversees a rapid-setting cementitious material certification program to assist airfield managers and repair teams in selecting commercially available proprietary products to repair spalls in airfield concrete pavements. The program includes critical performance tests, such as compressive strength, flexural strength, and set time, as well as tests to evaluate each product's long-term resistance to more environment-based distress. One potential issue with the use of rapid-repair products is that they can become brittle and prone to cracking, causing potential foreign object debris (FOD) damage to aircraft. Proprietary products offer high early strengths, quick set times, and the ability to withstand traffic for many years. These products evolve, and new or modified products must be properly evaluated to ensure that they do not fail under traffic and that they can be placed without reaching the initial set prematurely. For this effort, the existing US Department of Defense (DoD) laboratory test protocol was evaluated by performing multiple tests on 25 repair products. Eleven products were also used to conduct permanent and emergency spall repairs that were load tested with simulated aircraft traffic to assess the protocol's effectiveness in identifying quality rapid-setting repair products. Larger emergency repairs (approximately 2.4×2.4 m) were also conducted with three products and load tested. Overall, several changes to the laboratory protocol were recommended, but full-scale tests indicated that the recommended protocol is still effective for selecting quality products. Larger emergency repair test results indicated that rapid-setting repair products can be effective for these size repairs, but the need for full-scale testing before certification was heavily emphasized. Practical Applications: The newly modified protocol for evaluating rapid-setting cementitious repair products in the laboratory is expected to have immediate use for airfield repair practitioners. There are many commercially available products, and the ability to identify high-performing products via a suite of laboratory tests should help extend the life of airfield repairs. In addition, the emergency spall repair and emergency large repair techniques discussed in this paper could be useful for civilian airport repair applications, where downtimes are very limited due to very full flight schedules. Conducting a very quick repair with high-quality materials can maintain flight operations until a more permanent repair can be conducted. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Development of Deceleration-Based Friction Prediction Models and Methods on Semiprepared Runway Surfaces

Author

Ward, Andrew B., Falls, Anthony J., and Rutland, Craig A.

Abstract

Both civilian and military airfield managers require the safe operation of aircraft on runway surfaces. This includes the operation of ground traffic on airfield operating surfaces as well as connecting road infrastructure. Often times in austere environments, this road infrastructure is unpaved and consists mostly of either semiprepared or unbound soils. It has been shown in numerous research efforts that surface friction is an excellent indicator of safe operating conditions. Although a great deal of work has been done to quantify safe surface conditions for landing and takeoff operations on rigid and flexible pavement structures, limited research exists to extend such efforts to soil-based or semiprepared surfaces. The objective of this research was to develop deceleration-based surface friction prediction models on unpaved surfaces with varied moisture conditions and soil types. Surface friction, in this study, was quantified using the Findlay Irvine Mk2-D GripTester. Deceleration was measured using four smartphone inertial measurement units (IMUs), one Bowmonk IMU, and one Xsens IMU. Tests were conducted in three ground vehicles: a high-mobility multipurpose wheeled vehicle, a civilian ½-ton pickup truck, and a civilian full-size sport utility vehicle. The various deceleration-based devices tested here adequately correlated (coefficient of determination >0.6) with Mk2-D GripTester measurements collected on unpaved soil runways. The models and measurement methods detailed here are of considerable use to both semiprepared runway and ground vehicle operations managers around the world needing to measure safe surface conditions following inclement weather.

Published
2024
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5. Flatliner cold planer evaluation for airfield pavement maintenance

Author

Rushing, John F.; Falls, Anthony J.; Rutland, Craig A., United States. Army. Corps of Engineers; Engineer Research and Development Center (U.S.); Geotechnical and Structures Laboratory (U.S.); Air Force Civil Engineering Center (U.S.), Rushing, John F.; Falls, Anthony J.; Rutland, Craig A., and United States. Army. Corps of Engineers; Engineer Research and Development Center (U.S.); Geotechnical and Structures Laboratory (U.S.); Air Force Civil Engineering Center (U.S.)

Abstract

ERDC/GSL TR-16-13 Flatliner Cold Planer Evaluation for Airfield Pavement Maintenance Geotechnical and Structures Laboratory John F. Rushing, Anthony J. Falls, and Craig A. Rutland June 2016 Approved for public release; distribution is unlimited. The U.S. Army Engineer Research and Development Center (ERDC) solves the nation’s toughest engineering and environmental challenges. ERDC develops innovative solutions in civil and military engineering, geospatial sciences, water resources, and environmental sciences for the Army, the Department of Defense, civilian agencies, and our nation’s public good. Find out more at www.erdc.usace.army.mil. To search for other technical reports published by ERDC, visit the ERDC online library at http://acwc.sdp.sirsi.net/client/default. ERDC/GSL TR-16-13 June 2016 Flatliner Cold Planer Evaluation for Airfield Pavement Maintenance John F. Rushing and Anthony J. Falls Geotechnical and Structures Laboratory U.S. Army Engineer Research and Development Center 3909 Halls Ferry Road Vicksburg, MS 39180-6199 Craig A. Rutland, PhD Engineering Division Civil Engineering Branch Air Force Civil Engineer Center 139 Barnes Drive, Suite 1 Tyndall AFB, FL 32403 Final report Approved for public release; distribution is unlimited. Prepared for Headquarters, Air Force Civil Engineer Center Tyndall Air Force Base, FL 32403-5319 Under Airfield Damage Repair Modernization Program Project Number 333159 ERDC/GSL TR-16-13 ii Abstract The U.S. Army Engineer Research and Development Center evaluated tools and procedures for removing small surface irregularities in airfield pavement repairs that cause unacceptable roughness for aircraft. A desirable tool could grind pavement surfaces smooth and flush. A Flatliner cold planer skid steer attachment was identified as a potential device and was used in a field evaluation. The field evaluation considered production rate, smoothness of the treated pavement, and tooth wear for airfield pavement repairs made on Portland

Published
2016

6. Long-Term Performance Evaluation of Asphalt Surface Treatments: Product Placement

Author

ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB, Rushing, John F., Falls, Anthony J., ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB, Rushing, John F., and Falls, Anthony J.

Abstract

The U.S. Army Engineer Research and Development Center recently began a research project to evaluate pavement preservation techniques for asphalt pavements on Army airfields. Three field sites were selected for testing. Field sites represented the following climatic regions: hot and wet, hot and dry, and cold. Each of the test sites was on a taxiway or parking apron pavement on an Army airfield. Commercially available products marketed for pavement preservation were placed at each site. Existing pavements were in good condition, and all exhibited only minor longitudinal or transverse cracking and limited weathering. Preliminary data were collected by evaluating pavement surface properties and by extracting pavement cores prior to placement of the surface treatment. Additional tests were performed after product placement. Annual evaluations will provide comparable data to quantify the benefit of the treatment based on its ability to reduce environmental distresses. This report provides information on the products placed at each site as well as pavement conditions before product placement., The original document contains color images.

Published
2010

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