Author: Harold L. Von QuintusPublisher: DIANE Publishing
ISBN: 1428995366
Category : Pavements
Languages : en
Pages : 146
Book Description
Backcalculation of layer parameters for LTPP test sections
Author: Publisher: DIANE Publishing
ISBN: 1428995684
Category :
Languages : en
Pages : 274
Book Description
Back-calculation of Layer Parameters for LTPP Test Sections
Author: Harold L. Von QuintusPublisher: DIANE Publishing
ISBN: 1428995366
Category : Pavements
Languages : en
Pages : 146
Book Description
Back-calculation of Layer Parameters for LTPP Test Sections: Layered elastic analysis for flexible and rigid pavements
Author: Publisher:
ISBN:
Category : Pavements
Languages : en
Pages :
Book Description
Vol. 1 documents the results of backcalculation of layer material properties for rigid pavements included in the Long Term Pavement Performance (LTPP) program in the United States and Canada using deflection testing data. Vol. 2documents the procedure and steps used to back-calculate the layered elastic properties (Young's modulus and the coefficient and exponent of the nonlinear constitutive equation) from deflection basin measurements for all of the Long-Term Pavement Performance (LTPP) test sections with a level E data status.
Backcalculation of Layer Parameters for LTPP Test Sections
Author: Lev KhazanovichPublisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 0
Book Description
"This report documents the results of backcalculation of layer material properties for rigid pavements included in the Long Term Pavement Performance (LTPP) program in the United States and Canada using deflection testing data. This study backcalculated the layer material properties for rigid pavements using the slab on elastic solid foundation and the slab on dense-liquid foundation procedures. The "best fit" algorithm was used after consideration of alternative methods of backcalculation. Pre-processing and post-processing utility software were developed to facilitate data handling. The backcalculation analysis was conducted for all General Pavement Studies (GPS), Special Pavement Studies (SPS), and Seasonal Monitoring Program (SMP) test sections. Data tables that include backcalculation parameters were developed for inclusion in the LTPP Information Management System (IMS). Key findings include the following: 1. The "best-fit" method was selected as the primary backcalculation method for both dense-liquid (DL) and elastic solid (ES) subgrade models. 2. Reasonable backcalculation results were obtained for the large majority of GPS, SPS, and SMP sections. Typical modulus values and ranges are provided for the PCC slab, many types of bases, and the subgrade. 3. Strong correlations were found between backcalculated parameters using DL and ES subgrade models. 4. Temperature curling during the day had a profound effect on the results of backcalculation [making it important to conduct falling weight deflectometer (FWD) basin testing early in the morning to reduce variability in backcalculated values]. 5. Poor correlation was found between backcalculated and laboratory elastic moduli of the concrete slab. 6. A bonded interface between the slab and base produced the best layer moduli for a large majority of the sections (center slab backcalculation)"--Tech. report doc. page.
Backcalculation of Layer Parameters for LTPP Test Sections
Author: Lev KhazanovichBack Calculation Of Layer Parameters For LTPP Test Sections, Volume I: Slab On Elastic Solid And Slab On Dense-Liquid ..., Publication No. FHWA-RD-00-086 ... U.s. Department Of Transportation
Author: Variations in Backcalculated Pavement Layer Moduli in LTPP Seasonal Monitoring Sites
Author: EO. LukanenPublisher:
ISBN:
Category : Backcalculation
Languages : en
Pages : 16
Book Description
Seasonal variations in structural parameters were calculated from Falling Weight Deflectometer data on 25 LTPP flexible seasonal monitoring sections. In all, 23,976 deflection basins were analyzed. The deflection basins were collected monthly between the fall of 1993 and the spring of 1995. The test locations were distributed around North America from Saskatchewan to South Texas and from Idaho to Maine. The sections all consisted of asphalt surfacing and granular bases (and some granular subbases) over subgrades. Asphalt thicknesses ranged from 46 to 277\mm. Seasonal variations observed on selected sections in this database and documented in this paper include variations in asphaltic materials with temperature, variations in moduli of the unbound materials with precipitation, and variations in moduli of unbound materials due to freeze/thaw. For moderately thick to thick asphalt sections (>125 mm) the temperature dependency can clearly be seen in the deflection basins. As expected, this variation in deflections, and AC modulus is sinusoidal over the year. The amplitude of the sinusoidal variations were found to be heavily influenced by the thickness of the AC layer. Thicker AC sections exhibited higher sinusoidal variations. Base and subgrade values tended to be influenced by temperature but remained more consistent throughout the year except in cases where freezethaw effects were seen. During freeze conditions, the moduli of the unbound (base and subgrade) layers drastically increased.
CTD measurements during 1999 and 2000 as part of the Global OceanAtmosphereLand System (GOALS)/Pan American Climate Studies (PACS)
Author: Publisher: DIANE Publishing
ISBN: 1428995676
Category :
Languages : en
Pages : 128
Book Description
Nondestructive Testing of Pavements and Backcalculation of Moduli
Author: Shiraz D. TayabjiPublisher: ASTM International
ISBN: 0803128584
Category : Materials
Languages : en
Pages : 534
Book Description
As with the previous two symposia, the 32 papers from the June/July, 1999, Seattle symposium present advances in the nondestructive testing of pavements using conventional falling weight deflectometer techniques and other promising techniques such as ground penetrating radar, rolling weight deflecto
Author: