Proceedings of the 12th International Conference on Concrete Pavements最新文献

{"title":"Accounting of Strain Cycles Sustained by Airfield Rigid Pavements","authors":"A. Ioannides, J. A. Harrison, Carlos R. Gonzalez, Peter G Bly","doi":"10.33593/crd3iwco","DOIUrl":"https://doi.org/10.33593/crd3iwco","url":null,"abstract":"The so-called 72-in. rule, employed in U.S. Department of Defense rigid pavement design for establishing the number of strain cycles arising under a pass of any aircraft on a particular pavement system, is re-examined using mechanistic tools, particularly layer elastic theory and dimensional analysis. Field data collected at Denver International Airport are reproduced using analytical simulations, which permit the generation of analogous synthetic results pertaining to different pavement systems and aircraft gear configurations. The analysis affirms the expectation that the criterion for establishing the number of strain cycles cannot be simply a fixed value, defined exclusively by the tandem wheel spacing. Rather, the dual wheel spacing and the radius of each tire-print must also be taken into consideration. In addition, the radius of relative stiffness of the pavement system needs to be accounted for. In this study, these variables are accommodated in the form of three dimensionless independent input parameters. The single dependent variable is the ratio (trough strain / maximum strain), denoted herein as υ. A process is formulated to ascertain whether υ is positive or negative: if υ>0, then one strain cycle may be expected; if υ<0, then two strain cycles may be expected. Comparisons of the process outcomes to those from the 72-in. rule show excellent agreement for the Denver conditions, testifying to the admirable simplicity and laudable wisdom of the latter. The process may be further refined for application to more complex gear configurations, e.g., tridems.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127515850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Establishing Effects of Superloads on Doweled Jointed Plain Concrete Pavements","authors":"Charles Donnelly, J. Vandenbossche","doi":"10.33593/kpufzjey","DOIUrl":"https://doi.org/10.33593/kpufzjey","url":null,"abstract":"Superloads are typically defined as vehicles weighing greater than 890 kilonewtons (200,000 pounds), although the geometrics of the vehicle are also a consideration. The damage of these superloads on jointed plain concrete pavements (JPCP) as compared to a standard 80-kN (18-kip) single axle design load are not well defined. The purpose of this study is to identify the effects of these superloads on the performance of JPCP joints in comparison to that of standard traffic loads. One mechanism of failure at the transverse joints in JPCP is the degradation of dowel performance. This can decrease the effectiveness of the joint load transfer efficiency; thereby resulting in large differential deflections and the development of faulting. Therefore, to quantify the damage caused by superloads, typical load configurations were identified using superload permit data obtained from the Pennsylvania Department of Transportation. Using the typical superload profiles established from permit data, the effect on dowel performance is evaluated.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"174 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123760250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sensitivity Analysis of FAARFIELD Rigid Airport Pavement Thickness Determination","authors":"G. White, Mitch Sterling, Matt Duggan, J. Sterling","doi":"10.33593/38a8fh4e","DOIUrl":"https://doi.org/10.33593/38a8fh4e","url":null,"abstract":"FAARFIELD is a common mechanistic-empirical software that uses a combination of layered elastic and finite element methods for the determination of rigid aircraft pavement thickness. The primary input parameters are the aircraft type, mass and departures, concrete flexural strength, sub-base material and thickness, as well as subgrade support characteristic. A parametric sensitivity analysis, including three common commercial aircraft and four subgrade conditions, determined that concrete thickness was most sensitive to concrete strength and aircraft mass. The concrete thickness was least sensitive to the sub-base material and thickness and was moderately sensitive to the subgrade condition and aircraft departures. These relative sensitivities were consistent when the results were analysed based on average percentage change in concrete thickness, the average slope of lines of best fit for normalised parameter values and the coefficients of a numeric linear regression for concrete thickness. It is recommended that designers focus their attention on accurately estimating realistic concrete strength and aircraft mass values, as these parameters had the greatest influence on concrete thickness.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":" 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113948107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laboratory And Field Tests On A Prefabricated Steel-Bar Mesh-Panel System For Continuously-Reinforced-Concrete Pavement (CRCP)","authors":"Norinobu Katayama, Kazuhiko Fujisaki, Takehisa Ueno, Ryutaro Onishi, I. Yoshitake","doi":"10.33593/fbj2y5fe","DOIUrl":"https://doi.org/10.33593/fbj2y5fe","url":null,"abstract":"The decline in the number of persons of working age is a social problem in Japan. This is a particularly serious concern for workers in the construction field; construction systems should be considered for productivity improvements. Prefabrication systems are an effective method for shortening construction cycles and times. In fact, various precast concrete members have been employed to realize more rapid construction and improvements in quality. Using precast concrete members is difficult because jointless roads are preferable for highway pavement. Continuously reinforced concrete pavement (CRCP), which has the advantages of concrete jointless construction and high ductility, is a suitable method for highway road construction. Typical Japanese highways built with CRCP reduce the amount of horizontal cracking by arranging transverse rebars at an angle of 60° to the main rebars. Note that rebar placement and bonding in conventional CRCP are troublesome and labor intensive owing to the long construction time required. We have developed prefabricated steel bar meshes for CRCP and can report some benefits relating to their practical application. To examine the fundamental properties of mesh panels, we conducted a laboratory experiment and a simulated field test. The primary concern of welded rebars are failures induced by cyclic loading. A flexural fatigue loading test using CRCP models was conducted. In addition, a comparative survey on conventional and prefabrication systems was performed in the simulated field test to quantify the constructability of CRCP and to observe the extent of cracking in concrete. This paper reports on our experimental investigation.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"419 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131856721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Interlayer Properties on the Performance of Unbonded Concrete Overlays","authors":"J. Vandenbossche, John W. DeSantis","doi":"10.33593/a2dhe4o6","DOIUrl":"https://doi.org/10.33593/a2dhe4o6","url":null,"abstract":"Unbonded concrete overlays (UBOL) consist of a new Portland cement concrete (PCC) layer placed on an existing PCC pavement. The new concrete layer is separated from the existing pavement by an interlayer system, allowing these overlays to be placed on distressed PCC pavements. The interlayer system usually consists of a thin open graded or dense graded hot mix asphalt (HMA) layer or a non-woven geotextile fabric. In an effort to develop a mechanistic-empirical design procedure for UBOLs, the effects of the interlayer properties on the performance of the overlay must first be established. There are many variables to consider when selecting an interlayer for UBOLs such as, drainability, frictional restraint, prevention of reflective cracking, and stability of a mixture to prevent erosion or consolidation/ rutting. Performance data from in-service pavements at the Minnesota Road Research Facility (MnROAD), Michigan, Missouri, and Pennsylvania, as well as data in the Long-Term Pavement Performance (LTPP) database is examined to establish the influence of interlayer characteristics on overlay performance. . Many of the distresses are at least partially caused by breakdown of the interlayer. Longitudinal cracking develops in the wheelpath due to erosion or consolidation of an asphalt interlayer, while transverse cracking can occur due to reflective cracking, reflective distress, or erosion along the transverse joint. The characteristics of the interlayer also play a role in the rate of the development of faulting. Based on this evaluation, factors that should be considered for optimizing the performance of the interlayer are defined.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131872724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comparative study of crack behavior of continuously reinforced concrete pavements (CRCP) on three sections in Germany","authors":"M. Moharekpour, S. Hoeller, M. Oeser","doi":"10.33593/4pr5xno7","DOIUrl":"https://doi.org/10.33593/4pr5xno7","url":null,"abstract":"The traffic volume and the amount of heavy traffic on German motorways increased steadily. To guarantee mobility and reduce the national economic costs, road construction with maximum service life, minimum maintenance and minimum traffic restrictions for maintenance are needed. Continuously reinforced concrete pavement (CRCP) are extremely durable in terms of use and maintenance. CRCP offer lower thickness, no transversal joints and the possibility to improve skid resistance and reduction of noise emissions through a thin asphalt surface. The performance of CRCP is influenced by a number of specific characteristics such as the thickness and the quality of the concrete, the longitudinal and transversal reinforcement, the base layer and the environmental conditions. These aspects influence the crack pattern, crack distance and crack widths. In Germany CRCP is in the stage of field testing. From 1997 to today, a total of 8 sections with many variations have been constructed. A detailed comparative study of these sections has been lacking. As part of a research project, the RWTH University and the German Federal Highway Research Institute (BASt) are investigating these sections in CRCP with and without an asphalt surface in Germany and compare it to the Belgium standard constructions. Three CRCP sections were selected and evaluated throughout Germany. The aim is to evaluate the different designs in the sections in terms of their behavior, to quantify achievable service life, necessary maintenance and availability. From this, a preferred variant of the construction is designed and implemented on a motorway in Germany as part of a trial site.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130178194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Developing New Approach to CRC Pavement Punchout Model Calibration","authors":"Issa M. Issa, D. Zollinger","doi":"10.33593/ixt4104e","DOIUrl":"https://doi.org/10.33593/ixt4104e","url":null,"abstract":"Local calibration of the punchout model in the Pavement ME software is a vital step in achieving performance predictability for the design of Continuously Reinforced Concrete (CRC) pavement. In Oklahoma, there was only limited performance data available in the General Pavement Studies (GPS) database for CRC pavement. This set of circumstances required a different approach as to the type of data used for calibration. The type of data originally utilized in NCHRP 1-37A essentially represented visually evident damage that is clearly observable at the surface of the pavement structure. Non-observable damage however is actually of greater value as a source of calibration data since it represents the deteriorative conditions that lead to the visual manifestation of the damage process. Since visually validated distress is the end result of the distress cycle the traffic level associated with it is often subject to a considerable amount of error. In this regard, non-observable data such as erosion damage is shown to be a good indicator of and a substitute for actual punchout data since it represents the deterioration of the slab subbase interface that has be found to closely aligned with the punchout process. The amount of erosion is evaluated based on FWD data and is shown it to be a reliable way to determine the calibration coefficients for the punchout model. This paper proposes an approach for calibrating local coefficients for CRC pavements based on non-observable performance data. The main process of this methodology requires estimating erosion percentage damage using Falling Weight Deflectometer data (FWD), determining the percentage of punchout from the Long-Term Performance Program (LTPP) records, and establishing the relationship between both components to estimate the existing punchout distresses. This relationship can be used to calculate the actual damage including erosion damage and to calibrate the local coefficients used in the pavement ME punchout model. This methodology was carried out on one section from Oklahoma and one section from Texas in order to validate its applicability and conclude on the pavement ME punchout model and its ability to predict punchout distress in the field.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129465019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Paste Curing Effectiveness with Contactless Sensing and 2D Wavefield Analysis","authors":"Quang Tran, J. Roesler","doi":"10.33593/mmj09v6u","DOIUrl":"https://doi.org/10.33593/mmj09v6u","url":null,"abstract":"The serviceability and performance life of concrete pavement are improved by temperature and moisture management during the initial cement reactions, which has been done successfully by various curing methods and compounds. However, the effectiveness of all curing compounds and methods has been difficult to measure spatially and rapidly in the field. In this paper, a new contactless ultrasonic testing system (UTS) and 2D wavefield analysis are introduced to evaluate the effectiveness of curing methods and compounds through monitoring of the near-surface damage of early-age hydrating paste. Cement paste specimens were cast and exposed to elevated drying conditions (23 C air temperature, 46% humidity, and 6.6 m/s wind speed) while subjected to no curing, plastic cover curing, and a wax- based compound. The UTS employed a fully contactless 50kHz ultrasonic transmitter and an array MEMS receivers. The paste specimens were monitored at ages 1, 4, 7 days after casting for the evolution of near-surface cracking. The non-contact UTS monitored the energy of leaky Rayleigh waves (LR-waves) signal over time and analyzed the frequency-wave number (f-k) domain to characterize the quantity of near-surface damage in the cement paste specimens. An ultrasonic surface damage index (USDI) was defined from f-k wavefield domain based on the ratio of the non- propagating and forwarding LR-waves. The contactless sensing and 2D wavefield analysis easily distinguished the specimen damage differences between the no curing surface, the plastic sheet cover cure, and the wax-based curing. Surfaces with low surface damage had little to zero non-propagating wave energy, which was seen in the wax-based curing specimens and the unexposed bottom surfaces of all cast specimens.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121119805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use Of Alternative Aggregates In Pavement Concrete: Research And Practice In Belgium","authors":"E. Boonen, Slyvie Smets, A. Van der Wielen","doi":"10.33593/k49ulzbe","DOIUrl":"https://doi.org/10.33593/k49ulzbe","url":null,"abstract":"Alternative aggregates, including recycled (concrete) aggregates as well as artificial aggregates (such as crushed stainless steel slag), are being increasingly used in road construction in the context of a more circular economy, e.g. in base and subbase layers. As these materials are applied higher up in the structure (surface and binder courses), stricter requirements are made to allow for higher loads and the stronger influence of the environment, and the application of these aggregates becomes less straightforward. The Belgian standard specifications, for instance, allow incorporation of recycled concrete aggregates in concrete pavements or linear elements in concrete, but only if certain stringent requirements are met and only up to certain percentages of substitution of the natural coarse aggregates. Furthermore, artificial aggregates originating from stainless steel slag are not even allowed for the time being in pavement quality concrete, although a Belgian standardization working group has recently been installed to investigate this matter in more detail. This paper presents an overview of laboratory research conducted in Belgium to characterize several types of alternative aggregates and concrete mixtures incorporating them, while focusing on practical execution as well as on the durability of pavement concrete. In addition, several concomitant pilot applications in Belgium are discussed in view of future perspectives for the application of alternative (recycled and/or artificial) aggregates in road construction.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116407270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"System Design Improvements of Heated Pavements: Recommendations for Future Projects","authors":"Amir Malakooti, S. Sadati, H. Ceylan, Sunghwan Kim","doi":"10.33593/graq16tb","DOIUrl":"https://doi.org/10.33593/graq16tb","url":null,"abstract":"Many agencies allocate a great deal of resources to clearing infrastructure systems (e.g., roads, bridges, and airports) from ice and snow during winter seasons using traditional snow-removal equipment and application of salt or de-icing chemicals. Using an electrically-conductive concrete (ECON) heated pavement system (HPS) is a cost-effective and environmentally friendly approach to melting ice and snow. ECON is a carbon-fiber-reinforced form of concrete that uses carbon fiber (conductive agent) with low median electrical resistivity to conduct electrical current through the concrete ECON layer through embedded stainless-steel electrodes. The inherent electrical resistance in the concrete generates heat used in the ECON HPS to melt ice and snow on the surface. ECON HPS construction is different from regular concrete construction in using two-lift paving, two different concrete mixes, and embedded stainless-steel electrodes with electrical connections to a power supply. An ECON HPS demonstration project has recently been constructed at the south parking lot of the Iowa Department of Transportation in Ames, Iowa. This project consists of 10 instrumented slabs, and this paper is focused on the ideas for improvement and lessons learned emerged from the full-scale demonstration project with respect to the construction methods the ECON mix design, control system design, electrode, cross slope design, and instrumentation of the concrete pavement system. These improvements in the construction of this unique concrete pavement system are expected to increase future paving quality, ECON HPS performance, and significantly decrease construction time and cost of such systems.","PeriodicalId":265129,"journal":{"name":"Proceedings of the 12th International Conference on Concrete Pavements","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129159443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}