Policy implications of standalone timing versus holistic timing of infrastructure interventions: Findings based on pavement surface roughness

2021 ◽  
Vol 148 ◽  
pp. 79-99
Author(s):  
Julie Yu Qiao ◽  
Runjia Du ◽  
Samuel Labi ◽  
Jon D. Fricker ◽  
Kumares C. Sinha
Keyword(s):  
Surface Roughness ◽  
Policy Implications ◽  
Pavement Surface

scholarly journals An Investigation of the Polishing Behavior of Calcined Bauxite Aggregate

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 760 ◽  
Author(s):  
Fa Yang ◽  
Bowen Guan ◽  
Jingyi Liu ◽  
Jiayu Wu ◽  
Jianan Liu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Los Angeles ◽  
Surface Coatings ◽  
Skid Resistance ◽  
X Ray Diffraction ◽  
Construction Costs ◽  
X Ray ◽  
Pavement Surface ◽  
Lower Porosity

The application of top-grade calcined bauxite to improve the skid resistance of pavement surface coatings increases construction costs and causes excessive tire wear. Therefore, it is necessary to investigate the polishing behavior of different grades of calcined bauxite aggregate. The polished stone value of calcined bauxite was measured after the standard polishing time and the extended polishing time. The Los Angeles (L.A.) abrasion and the crushing value, profile roughness, hardness, X-ray diffraction, and micromorphology were also tested. The results showed that the calcined bauxite above 75# (the ratio of corundum to mullite by weight, C/M > 1) satisfied the requirement of the ultra-thin friction course. Compared with basalt, the calcined bauxite above 80# (C/M > 3) has better long-term skid resistance, even though the pavement surface is subject to heavier traffic. Due to the higher cohesion of lower porosity, more hard minerals to keep the surface roughness, and less soft minerals to smooth the surface roughness, calcined bauxite with a higher corundum content has the better skid resistance. There is a power law relationship between C/M and Polished Stone Value (PSV). Considering the diminishing returns of higher-grade calcined bauxite, it is necessary to accurately select the appropriate C/M of calcined bauxite before use in pavement surface coatings.

Definition and measurement of pavement surface roughness

Wear ◽  
1979 ◽  
Vol 57 (1) ◽  
pp. 127-136 ◽  
Author(s):  
Rudolph R. Hegmon
Keyword(s):  
Surface Roughness ◽  
Pavement Surface

Remaining Life Prediction of Asphalt Concrete Pavement under Dynamic Load

2011 ◽  
Vol 255-260 ◽  
pp. 3161-3165
Author(s):  
Min Qin ◽  
Zhao Feng Lu
Keyword(s):  
Surface Roughness ◽  
Asphalt Concrete ◽  
Permanent Deformation ◽  
Prediction Method ◽  
Concrete Pavement ◽  
Pavement Management ◽  
Remaining Life ◽  
Pavement Surface ◽  
Scientific Decision ◽  
Asphalt Concrete Pavement

With the theory of M.W.Sayers, the pavement surface roughness was simulated by the sine curve. Through the Mat lab and VC + + program, the dynamic vehicle load caused by pavement surface roughness was analyzed and calculated. Given the dynamic road and environment factors and combined the test results of highway surface roughness, the deterioration law of pavement roughness were studied by amendment Shell permanent deformation theory. A new prediction method was put forward to predict the remaining life of asphalt concrete pavement, which was proved to be reasonable and reliable and can provide a valuable basis for the scientific decision-making of asphalt pavement management.

Roughness measurements of nonlinear optical polymer films by scanning tunneling microscopy

1989 ◽  
Vol 47 ◽  
pp. 22-23
Author(s):  
I. H. Musselman ◽  
R.-T. Chen ◽  
P. E. Russell
Keyword(s):  
Surface Roughness ◽  
Scanning Tunneling Microscopy ◽  
Nonlinear Optical ◽  
Polymer Surface ◽  
Light Extinction ◽  
Scanning Tunneling ◽  
Silicon Substrates ◽  
Tunneling Microscopy ◽  
Optical Polymer ◽  
Total Light

Scanning tunneling microscopy (STM) has been used to characterize the surface roughness of nonlinear optical (NLO) polymers. A review of STM of polymer surfaces is included in this volume. The NLO polymers are instrumental in the development of electrooptical waveguide devices, the most fundamental of which is the modulator. The most common modulator design is the Mach Zehnder interferometer, in which the input light is split into two legs and then recombined into a common output within the two dimensional waveguide. A π phase retardation, resulting in total light extinction at the output of the interferometer, can be achieved by changing the refractive index of one leg with respect to the other using the electrooptic effect. For best device performance, it is essential that the NLO polymer exhibit minimal surface roughness in order to reduce light scattering. Scanning tunneling microscopy, with its high lateral and vertical resolution, is capable of quantifying the NLO polymer surface roughness induced by processing. Results are presented below in which STM was used to measure the surface roughness of films produced by spin-coating NLO-active polymers onto silicon substrates.

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