Nondestructive Testing of Concrete Pavements for Characterization of Effective Built-In Curling

2005 ◽  
Vol 33 (5) ◽  
pp. 12338
Author(s):  
DR Petersen ◽  
RE Link ◽  
S Rao ◽  
JR Roesler
Keyword(s):  
Nondestructive Testing ◽  
Concrete Pavements

Microscale Heat Island Characterization of Rigid Pavements

2017 ◽  
Vol 2639 (1) ◽  
pp. 73-83 ◽  
Author(s):  
Sushobhan Sen ◽  
Jeffery Roesler
Keyword(s):  
Radiative Forcing ◽  
Time Lag ◽  
Thermal Inertia ◽  
Concrete Pavements ◽  
Heat Island ◽  
Rigid Pavements ◽  
Subsurface Layers ◽  
Urban Heat ◽  
Base Course

Rigid pavements have an impact on the urban heat island (UHI) and hence the surrounding environment and human comfort. Currently, most studies use a mesoscale approach in UHI characterization of pavements. This study proposes a microscale approach that can be incorporated into a pavement life-cycle assessment (LCA). The heat flux of various concrete pavements containing layers of varying thermal diffusivity and inertia was simulated. The surface pavement radiative forcing (RFp) was developed as a metric for use in a pavement LCA. Additionally, the heat conducted and stored in each concrete pavement system was analyzed using an average seasonal day metric to understand the temporal pavement energetics. Of the various thermal cases, only a higher albedo surface significantly changed the RFp for a fixed climate. However, a time lag was induced by the thermal inertia of the base course, which decreased the amount of heat conducted out of the pavement at night by storing heat in the base course for a longer time, effectively reducing nighttime UHI. Diurnal variations in thermal behavior can be controlled by changing the thermal properties of subsurface layers, which can be used to partially mitigate UHI.

CHARACTERIZATION OF AIR VOIDS IN FRESH CEMENT PASTE THROUGH ULTRASONIC NONDESTRUCTIVE TESTING

2008 ◽  
Author(s):  
R. M. Kmack ◽  
L. J. Jacobs ◽  
K. E. Kurtis ◽  
J.-Y. Kim ◽  
Donald O. Thompson ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Cement Paste ◽  
Ultrasonic Nondestructive Testing ◽  
Air Voids

Characterization of Nitinol Laser-Weld Joints by Nondestructive Testing

2015 ◽  
Vol 24 (12) ◽  
pp. 4991-4996 ◽  
Author(s):  
Markus Wohlschlögel ◽  
Gunter Gläßel ◽  
Daniela Sanchez ◽  
Andreas Schüßler ◽  
Alexander Dillenz ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Laser Weld ◽  
Weld Joints

Innovative test method for the reliable evaluation of joint sealants in concrete pavements

2021 ◽  
Author(s):  
David Ov ◽  
Rolf Breitenbücher ◽  
Martin Radenberg ◽  
Dominik Twer
Keyword(s):  
Plain Concrete ◽  
Test Method ◽  
Life Cycle Costs ◽  
Artificial Ageing ◽  
Concrete Pavements ◽  
Joint System ◽  
Relevant Element ◽  
Reliable Correlation

Joint sealants as indispensable filling systems in jointed plain concrete pavements (JPCP) are permanently exposed to various stresses during their service life, which often leads to a replacement of the sealing after approx. 7 to 10 years. Aside from seasonal unsteady climatic changes, the cyclical stresses caused by traffic and the ageing of joint sealants are especially significant. Considering the rising number of damages that occur within the overall "joint" system, an increased demand for a durable solution is requested as it is a relevant element for the life cycle costs of concrete pavements. In this context, a testing and ageing method was developed which comprises of the entire "joint" system, including the saw-cut concrete joint flanks, the primer as well as the joint sealant. This procedure depicts the decisive scenarios of in-situ stresses and allows the characterization of joint sealants. For this purpose, specimens were subjected to horizontal and vertical loads (static/cyclic) as well as to various ageing effects (temperature conditioning, UV-conditioning and freeze-thaw-cycles). After conditioning, a significant influence of the artificial ageing on the residual strength was observed in the tensile/shear tests. By comparing the artificially aged samples tested in the laboratory with extracted and in-situ aged samples, a reliable correlation was determined. Considering these system tests an initial approach was established which enables the evaluation of joint sealants in both unaged and artificially aged conditions on the basis of scientific parameters and limits.

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