Download or read book Predicting the Effects of Freezing and Thawing on Pavement Support written by Craig H. Benson and published by . This book was released on 1998 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to develop a method to predict the timing of weight limits on secondary highways in Wisconsin. Two types of weight limits are of interest: overloads when the pavement is frozen and weight restrictions during thawing and post-thawing recovery period. To meet this objective, three sections of secondary highways with flexible pavements were instrumented and monitored to determine how freezing, thawing, and post-thaw recovery affect pavement stiffness. Data collected from these sites were used to develop a computer model (UWFrost) that can be used to predict seasonal changes in the support capacity of pavements.
Download or read book Predicting the Effects of Freezing and Thawing on Pavement Support written by Craig H. Benson and published by . This book was released on 1998 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to develop a method to predict the timing of weight limits on secondary highways in Wisconsin. Two types of weight limits are of interest: overloads when the pavement is frozen and weight restrictions during thawing and post-thawing recovery period. To meet this objective, three sections of secondary highways with flexible pavements were instrumented and monitored to determine how freezing, thawing, and post-thaw recovery affect pavement stiffness. Data collected from these sites were used to develop a computer model (UWFrost) that can be used to predict seasonal changes in the support capacity of pavements.
Download or read book Predicting Seasonal Changes in Pavement Stiffness and Capacity Caused by Freezing and Thawing written by Craig H. Benson and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Prediction of Pavement Behavior Underloading During Freezing and Thawing written by Edwin J. Chamberlain and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pavement Deflection Data as a Tool for the Prediction of Freeze thaw Response written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Winter pavement overload permits and spring load restrictions areimportant to maximize pavement life. In cold regions freeze and thaw conditions have a great effect on the bearing capacity of asphalt concrete (AC) pavement and its sublayers. Studying AC surface deflections from falling weight deflectometer (FWD) tests assists in determining the condition of the surface, base, and subgrade layers of a pavement system. FWD test results are taken from the LTPP Information Management System (IMS). FWD data deflectionbasin indices can be calculated to analyze AC pavement at different seasonalconditions. This data will aid in determining times when load permits and restrictions should be applied. Seasonal effects on AC pavements significantly affect the strength of theAC sublayers. In freezing temperatures the AC pavement and its sublayers become much stronger, where overload permits can be granted. However, when the system thaws the layers become extremely weak. Pavement is subject to damage and FWD tests show significant increases in surface deflection. When this happens spring load restrictions should be utilized to preserve the pavement. An in depth study of FWD data can be used to recommend the best times to enforce winter overload permits and spring load restrictions. Using the BISAR computer program, AC pavement can be modeled to represent FWD behavior at various times.
Download or read book On Thaw Weakening of Pavement Structures written by Erik Simonsen and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This doctoral thesis focuses on thaw weakening of pavement structures. The thesis consists of a literature review (Paper I), modeling and field verification of an evaluation procedure for pavements exposed to seasonal frost conditions (Papers II and III), and experimental studies on the resilient properties of unbound road materials during freezing and thawing (Papers IV and V).The literature review describes factors identified as significant for the extent of weakening during soil thawing, e.g. soil type, permeability, drainage conditions and rate of thaw. Also the rate of freezing may indirectly affect thaw weakening. Persisting structural changes in soil fabric are also frequently observed. Findings concerned with frost action effects on a number of test roads are presented. The effects of frost action on resilient behavior are also described. In conclusion, attempts to develop semi-mechanistic pavement design and evaluation procedures for pavements in cold regions are presented. Although the effects of climate on pavement structures are recognized as a major contributor to the deterioration of pavement structures in cold regions, only a few models concerned with both frost heave and thaw settlement have been developed. In Paper II, a coupled mass and heat transfer model is tested and evaluated with respect to parameters critical to thaw weakening. The results indicate that soil temperature is predicted very well and soil moisture relatively well during freezing and thawing. Paper III presents an initial attempt to implement a commercially available finite element program in an evaluation procedure for pavements in seasonal frost areas. The results are compared with data from an extensively instrumented test road and indicate that surface deflection and relative change in pavement stiffness are predicted very accurately. Although a time lag between maximum measured and predicted surface deflection is observed during thawing, the procedure is found to be promising. The results from extensive resilient modulus laboratory tests during freezing and thawing are presented in Paper IV. The results indicate that all the soils exhibited substantially decreased resilient modulus after freeze-thaw. The decrease is ascribed to an observed increase in volume, and consequently a looser soil structure, due to freeze-thaw. A significant hysteresis for the clay soil in warming and cooling was also observed. Variable confining pressure (VCP) triaxial tests are generally preferred to constant confining pressure (CCP) tests, due to the more realistic stress application. However, VCP tests have never been utilized for investigation of freeze-thaw effects on unbound road materials. Paper V reports results obtained utilizing CCP and VCP triaxial tests for the characterization of resilient soil behavior during freezing and thawing. The results indicate a significant difference in moduli computed from CCP and VCP data. However, resilient moduli display compatible values if interpreted in terms of mean values of deviator stress and mean normal stress. With regard to freeze-thaw effects on resilient moduli, the results are inconsistent with previous findings. However, this can be explained by the different test conditions applied. (Abstract shortened by UMI.)
Download or read book Resistance of Concrete to Freezing and Thawing written by Donald J. Janssen and published by Strategic Highway Research Program (Shrp). This book was released on 1994 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study, aimed at improving the freeze-thaw resistance of concrete, consists of three parts. Part I evaluates parameters affecting the freeze-thaw durability of concrete. A modification of the existing standard of method for determining the durability factor of concrete specimens is proposed, and a new procedure for fundamental transverse frequency (used in durability factor calculations) has been developed. Part II focuses on developing better methods for identifying nondurable aggregates, and has resulted in a rapid new test based on the hydraulic fracture of aggregates. Part III describes field experiments to evaluate the freeze-thaw resistance of a number of specified concrete mixes and the use of sealants to mitigate D-cracking. Preliminary field performance results are presented.
Download or read book Predicting the Behavior of Asphalt Concrete Pavements in Seasonal Frost Areas Using Nondestructive Techniques written by Vincent C. Janoo and published by . This book was released on 1990 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four different pavement test sections were subjected to freeze-thaw cycling in CRREL's Frost Effects Research Facility (FERF). The test sections, each 610 cm in length, consisted of 1) 15.2 cm of asphalt concrete pavement over a clay subgrade, 2) 15.2 cm of asphalt concrete over 10.2 cm of crushed gravel over a clay subgrade, 3) 5.1 cm of asphalt concrete over 17.8 cm of crushed gravel over 20.3 cm of clean sand over a clay subgrade, and 4) 5.1 cm of asphalt concrete over 25.4 cm of crushed gravel over 12.7 cm of clean sand over a clay subgrade. Thermocouples were imbedded throughout the pavement structure and subgrade. During the thawing periods, deflection measurements were made at four locations in each test section using a Dynatest Falling Weight Deflectometer (FWD). The results of the deflection measurements are presented here. An analysis was done to quantify the subgrade strength based solely on FWD measurements. It was also shown that a relationship existed between thaw depth and FWD measurement in the subgrade.
Download or read book Asphalt Pavements written by Patrick Lavin and published by CRC Press. This book was released on 2014-04-21 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Asphalt Pavements provides the know-how behind the design, production and maintenance of asphalt pavements and parking lots. Incorporating the latest technology, this book is the first to focus primarily on the design, production and maintenance of low-volume roads and parking areas. Special attention is given to determining the traffic capacity, required thickness and asphalt mixture type for parking applications. Topics covered include: material information such as binder properties, testing grading and selection; construction information such as mixing plant operation, proportioning, mixture placement and compaction; and design information such as thickness and mixture design methods and guidelines on applying these to highways, city streets and parking Areas. It is an essential practical guide aimed at those engineers and architects who are not directly involved in the asphalt industry, but who nonetheless need to have a good general knowledge of the subject. Asphalt Pavements provides a novice with enough information to completely design, construct and specify an asphalt pavement.
Download or read book Progress in Industrial and Civil Engineering II written by Wei Jun Yang and published by Trans Tech Publications Ltd. This book was released on 2013-09-03 with total page 3780 pages. Available in PDF, EPUB and Kindle. Book excerpt: Collection of selected, peer reviewed papers from the 2013 2nd International Conference on Civil, Architectural and Hydraulic Engineering (ICCAHE 2013), July 27-28, 2013, Zhuhai, China. The 683 paper are grouped as follows: Chapter 1: Geological Engineering and Geotechnical Construction; Chapter 2: Structural Engineering; Chapter 3: Tunnel, Subway and Underground Facilities; Chapter 4: Coastal Engineering; Chapter 5: Bridge Engineering; Chapter 6: Road and Railway Engineering; Chapter 7: Seismic Engineering; Chapter 8: Hydrology and Irrigation; Chapter 9: Disaster Prevention and Mitigation; Chapter 10: Traditional Construction Materials; Chapter 11: Advanced Construction Materials; Chapter 12: Heating, Gas Supply, Ventilation and Air Conditioning; Chapter 13: Surveying Engineering and Measurement; Chapter 14: Cartography and Geographic Information System; Chapter 15: Construction Technology; Chapter 16: Computational Mechanics; Chapter 17: Construction Machinery and Equipment; Chapter 18: Project Management, Project Construction Cost and Engineering Management.
Download or read book A Multiscale Approach for Predicting Freeze thaw Damage in Asphalt Mixtures written by Lisa Lövqvist and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frost Action Predictive Techniques for Roads and Airfields written by and published by . This book was released on 1986 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Significant Findings from Full scale Accelerated Pavement Testing written by Frederick Hugo and published by Transportation Research Board. This book was released on 2004 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 325: Significant Findings from Full-Scale Accelerated Pavement Testing documents and summarizes the findings from the various experimental activities associated with full-scale accelerated pavement testing programs.
Download or read book Environmental Impacts on the Performance of Pavement Foundation Layers written by Bora Cetin and published by . This book was released on 2021 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seasonal freeze-thaw weakening has a significant effect on pavement foundation performance. The seasonal freeze-thaw cycles cause extensive damage to the pavement from frost-related problems such as frost heave, frost boils, thaw weakening, total rutting, and degradation of mechanical properties. Changes in temperature of pavement foundation geomaterials during freeze-thaw cycles can significantly influence the performance of pavement foundation layers. It is crucial to monitor the changes in water content, temperature, and matric suction of aggregate base and subgrade soils to be able to predict the frost depth, freezing and thawing times, and number of freeze-thaw cycles. This project has two main goals: (1) develop a data-driven model to predict the maximum/minimum frozen soil depths and (2) freezing and thawing duration and numbers via use of standard climate data that includes precipitation, shortwave radiation, and air temperature. During this research, a model was developed and validated using the climate and environmental data collected from MnDOT. As a result of this research an Excel tool was developed that can predict frost depth, soil temperature, number of freeze-thaw cycles, and duration of freezing and thawing periods at a given soil depth via use of weather data. The required climate data include air temperature, relative humidity, wind speed, precipitation, and solar radiation.
Download or read book Bulletin written by National Research Council (U.S.). Highway Research Board and published by . This book was released on 1955 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the Highway Research Board's annual meeting.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1990 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environment Friendly Construction Materials written by Shaopeng Wu and published by MDPI. This book was released on 2019-06-20 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Construction materials are the most widely used materials for civil infrastructure in our daily lives. However, from an environmental point of view, they consume a huge amount of natural resources and generate the majority of greenhouse gasses. Therefore, many new and novel technologies for designing environmentally friendly construction materials have been developed recently. This Special Issue, “Environment-Friendly Construction Materials”, has been proposed and organized as a means to present recent developments in the field of construction materials. It covers a wide range of selected topics on construction materials.
