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Author: Raymond S. Rollings Publisher: ISBN: Category : Cement Languages : en Pages : 100
Book Description
Past work and current technical literature were reviewed to determine potential capping materials for expedient repair of small craters (less than 20 by 20 feet repair areas) in airfield pavements. Seven materials identified in the literature review were tested in the laboratory to develop information on their strength and cure requirements. Accelerated high alumina cement, magnesium phosphate cement, three commercial asphalt products and unsurfaced, well compacted aggregate were recommended for field testing as the most promising small crater repair materials. (Author).
Author: Raymond S. Rollings Publisher: ISBN: Category : Cement Languages : en Pages : 100
Book Description
Past work and current technical literature were reviewed to determine potential capping materials for expedient repair of small craters (less than 20 by 20 feet repair areas) in airfield pavements. Seven materials identified in the literature review were tested in the laboratory to develop information on their strength and cure requirements. Accelerated high alumina cement, magnesium phosphate cement, three commercial asphalt products and unsurfaced, well compacted aggregate were recommended for field testing as the most promising small crater repair materials. (Author).
Author: Publisher: ISBN: Category : Languages : en Pages : 81
Book Description
Materials for expedient roadway pavement repairs must provide a trafficable repair in a minimal amount of time. Therefore, any repair material must be able to cure quickly and be easy to use. There are a large number of proprietary cementitious rapid repair materials for both asphalt and concrete pavements. Three types of cementitious materials were used to make acceptable expedient repairs to an asphalt roadway. Trafficking showed that these materials were not flexible enough to provide durable repairs to flexible pavements in hot weather. There are a number of proprietary asphalt based repair materials. These materials can generally be trafficked immediately after placement with some displacement, depending upon the loads. These products will gain more stability with time and with cooler temperatures. Repair materials using cut-back asphalts generally provide the best combination of workability and long-term storage under adverse conditions, particularly freezing temperatures. This study evaluated the asphalt repair materials for workability, strength using Marshall stability and triaxial testing, and durability in regards to cohesion and adhesion properties. The majority of repair materials use an open-graded mixture and the Marshall stability test is not appropriate for this type of gradation. The proprietary cold mixtures were all easier to apply and work with than the conventional cold mix. The products that advertised placement into wet holes all preformed well and provided equal performance in both wet and dry holes for the traffic and evaluation period used.
Author: Prashant Ram Publisher: ISBN: 9781622604395 Category : Languages : en Pages :
Book Description
The primary objective of the present study was to identify the critical properties (based on the laboratory tests) that could be correlated to the field performance of the rapid setting repair materials.The first phase of the project involved laboratory evaluation of six commercial rapid-setting repair materials (RMs). When tested in the laboratory, all but two exhibited acceptable rates of strength gain and three displayed relatively poor freeze-thaw resistance. All the RMs exhibited acceptable values for free-shrinkage, high resistance to cracking and good bond to substrate concrete. The resistance to chloride ion penetration of one of the RMs was very poor.The second phase of the project involved field installation and performance evaluation of the RMs. It was seen that while, in most cases, the controlled laboratory conditions yielded consistent mixes and acceptable performance, the properties of mixes produced on site were more variable. This was the result of somewhat uncontrolled changes in the amount of aggregate extension used, moisture content of the aggregates, amount water added and ambient temperature conditions. Follow-up inspection of the repair patches indicated that all the patches except one underwent premature failures (primarily cracking and edge de-bonding). The ambient temperature during the repairs was around 10°C. This led to an extended set-time for all the materials. The 12-hr compressive strengths values of the specimens from the field-mixes were occasionally lower than the 4-hr compressive strength values of laboratory mixes. Since the repairs were open to traffic after approximately 4 hours after placement, the low early age strengths could be a potential reason for premature failures of some of the patches.In general, several materials were found to be very sensitive to excess water added during mixing, resulting in a significant impact on the durability properties - especially the freeze-thaw resistance. In the field, for most of the materials, the consistency of the mixes varied across batches - this can be attributed to the variations in the aggregate extension adopted, mix-water added and the moisture content of the aggregates used. Construction-related issues (consolidation and finishing) also played an important role in the performance of the repair patches.
Author: Wynand JvdM. Steyn Publisher: Transportation Research Board ISBN: 0309223660 Category : Technology & Engineering Languages : en Pages : 257
Book Description
"TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 433: Significant Findings from Full-Scale Accelerated Pavement Testing documents and summarizes significant findings from the various experimental activities associated with full-scale accelerated pavement testing (f-sAPT) programs that have taken place between 2000 and 2011. The report also identifies gaps in knowledge related to f-sAPT and where future research may be needed. NCHRP Synthesis 433 is designed to expand the f-sAPT base of knowledge documented in NCHRP Syntheses 325 and 235, both with the same title of Significant Findings from Full-Scale Accelerated Pavement Testing. f-sAPT is the controlled application of a wheel loading, at or above the appropriate legal load limit, to a pavement system to determine pavement response in a compressed time period. The acceleration of damage is achieved by one or more of the following factors: increased repetitions, modified loading conditions, imposed climatic conditions, and thinner pavements with a decreased structural capacity which have shorter design lives"--
Author: P. S. Springston Publisher: ISBN: Category : Languages : en Pages : 54
Book Description
This report documents exploratory research conducted to develop a preliminary concept for repairing bomb-damaged runways with prefabricated fiberglass-reinforced plastic membranes. The membranes would function as traffickable caps over backfilled craters. A structural analysis has been completed using the finite element method and a design is presented for a membrane to be traffic-tested under simulated F-4 aircraft wheel loads at the Rapid Runway Repair Test Facility of the Air Force Engineering and Services Center/Research Division at Tyndall AFB, Florida. Methods for joining panels to form large membranes and a tiedown method are discussed. A general concept for rapid runway repair by the Naval Construction Forces using table-of-allowance (P25 and P31) equipment is presented. (Author).
Author: Raymond S. Rollings
Author: Raymond S. Rollings
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Author: Kevin G. Smith
Author: Prashant Ram
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Author: Wynand JvdM. Steyn
Author: P. S. Springston
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