2013 Session: 711

• Evaluation of Functional Properties of Porous Asphalt Pavements Subjected to Clogging and Densification of Air Voids
  Abstract: This study was motivated by concerns that porous asphalt concrete (PAC) might not perform well under the environmental and traffic conditions. It was feared that the drainability, friction, and noise benefits of PACs would be rapidly lost. PAC sections were constructed by using three different types of asphalt as follows: non-modified bitumen (NMB), polymer-modified bitumen (PMB), and highly-modified bitumen (HMB). These sections were completed in 2008 and evaluated twice per year for their functionality. Clogging and densification were shown to be the main reason to cause reduction in air voids of PAC. For the NMB and PMB sections, more than 70% of reduction in air voids resulted from traffic compaction, while less than 30% for the HMB section. The decrease in drainability corresponded well with the decrease in air voids. Cleaning PAC mixtures did not appear to be effective for the NMB and PMB sections since most reduction in air voids resulted from traffic compaction. Because of the significant amount of macrotexture produced within PAC pavement surfaces, PAC layers maintained adequate frictional characteristics even after become clogged and condensed. The noise characteristics of PAC depended on the air void content. No rutting, raveling, cracking or other failures have been observed on the three monitored sections to any significant extent since open to traffic in 2008, which suggests that PAC may be a viable pavement surface type for use on highways to provide good performance, including good friction, reduced splash and spray, and reduced tire¡Vpavement noise.
  Authors: Chen, Jian-Shiuh; Hsieh, Weichou; Liao, Min-Chih
  Authors: Chen, Jian-Shiuh; Hsieh, Weichou; Liao, Min-Chih
  Year: 2013
  Document Type: Paper
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-1623
• Sound Absorption and Friction Responses of Nano-Concrete for Rigid Pavements
  Abstract: This paper mainly reports on the influence of nanosilica on friction and sound absorption responses of concrete for application in rigid pavements. The feasibility of applying the nano-lotus leaf as a coating for concrete material is also discussed in this paper. Previous research on friction and sound absorption characteristics of concrete pavement mostly emphasized creating different surface textures through macrotexture modifications. The microstructure can also have significant effect on the surface texture, friction and sound absorption characteristics of concrete. This research studied the friction and sound absorption properties of concrete based on the microtexture modification using nano-materials such as nanosilica and nano-lotus leaf.Several laboratory concretes were produced using different proportions of nanosilica, which was used as a partial replacement of cement by weight. The fresh concretes were tested for workability, wet density, and air content. The hardened concretes were tested for compressive strength, friction and sound absorption. The British pendulum test was used to determine the friction number. The sound absorption coefficient was determined using an impedance tube. Preliminary results indicate that nanosilica can increase friction and sound absorption of concrete pavements. Also, the results show that the nano-lotus leaf can be applied as a coating on concrete material for rigid pavements to retain their friction property.
  Authors: Gonzalez, Marcelo; Safiuddin, Md.; Tighe, Susan Louise
  Authors: Gonzalez, Marcelo; Safiuddin, Md.; Tighe, Susan Louise
  Year: 2013
  Document Type: Paper
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-2248
• Evaluation of the Benefits of Diamond Grinding of CRCP in Texas
  Abstract: The paper discusses a study to evaluate the benefits of diamond grinding on a CRCP, used specifically for improving functionality in terms of surface macrotexture, skid resistance, roughness, and pavement noise. The effectiveness of diamond grinding in improving the above properties is calculated based on in-field observations. The effect of three different pre-existing conditions (carpet drag, burlap drag and transverse tining) on the effectiveness of the diamond grinding is also evaluated. The results of the analysis indicate that diamond grinding improved the surface macrotexture by 0.6 mm and skid resistance by about 60 %. The surface roughness of the diamond ground sections were on average appreciably reduced from 124 inch/mile to 80 inch/mile. An average overall reduction in noise level of 3.2 dBA was evident. A maximum reduction in the region of the noise frequencies (1,000 Hz to 2,500 Hz) was observed with a maximum noise reduction of 5.6 dBA at 1,600 Hz. The grinding operation produced a relatively uniform surface in terms of these properties despite the varying pre-existing conditions across the CRCP.
  Authors: Buddhavarapu, Prasad N. V. S. R.; Smit, Andre de Fortier; Trevino, Manuel; Banerjee, Ambarish; Prozzi, Jorge A.
  Authors: Buddhavarapu, Prasad N. V. S. R.; Smit, Andre de Fortier; Trevino, Manuel; Banerjee, Ambarish; Prozzi, Jorge A.
  Year: 2013
  Document Type: Paper
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-1515
  Practice-Ready: Yes
• Development and Implementation of a Beam Bridging Filter for Use in Airport Groove Identification
  Abstract: Transverse grooves on runways prevent hydroplaning of aircraft at high speeds and are therefore a vital component of air safety. To accurately identify groove geometry, this paper proposes a new type of beam bridging filter using a mechanical model to reduce the influence of short dips in pavement elevation profiles. This approach can adjust the effect of a tire’s contact with the road surface by modeling the contact area as a beam element with a series of compressive springs. If small dips or grooves with characteristic length significantly less than the length of the tire contact length are present in the pavement profile, the beam bridging filter simulates a bridge over the dips or grooves as would be formed by the tire’s contact with the ground. The beam bridging filter is compared with other types of bridging filter: 1) the physical straightedge method; 2) simulation of a profilograph wheel; 3) the FHWA bridging (moving average) filter; and 4) the UMTRI bridging (improved moving average) filter. Application of the bridging filter is demonstrated by incorporation in a transverse groove identification computer program for use on airport runway longitudinal profiles. The example demonstrates that using the proposed beam bridging filter leads to improved groove identification compared to the current low-pass filter implementation.
  Authors: Wang, Qiang; Hayhoe, Gordon F.
  Authors: Wang, Qiang; Hayhoe, Gordon F.
  Year: 2013
  Document Type: Paper
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-3063
  Practice-Ready: Yes
• Evaluation of Functional Properties of Porous Asphalt Pavements Subjected to Clogging and Densification of Air Voids
  Authors: Chen, Jian-Shiuh
  Authors: Chen, Jian-Shiuh
  Year: 2013
  Document Type: Presentation
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-1623
• Evaluation of the Benefits of Diamond Grinding of CRCP in Texas
  Authors: Buddhavarapu, Prasad
  Authors: Buddhavarapu, Prasad
  Year: 2013
  Document Type: Presentation
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-1515
• Development and Implementation of a Beam Bridging Filter for Use in Airport Groove Identification
  Authors: Wang, Qiang
  Authors: Wang, Qiang
  Year: 2013
  Document Type: Presentation
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-3063
• Sound Absorption and Friction Responses of Nano-Concrete for Rigid Pavements
  Authors: Gonzalez, Marcelo
  Authors: Gonzalez, Marcelo
  Year: 2013
  Document Type: Presentation
  Subject: Design; Pavements
  Session: 711
  Paper Number: 13-2248