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RISS 인기검색어
- 검색키워드
- 저자 : Shelley M. Stoffels (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Evaluation of Pavement Subgrade Long-term Equilibrium Moisture with Suction Potential
Abraham Bae,Shelley M. Stoffels 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1
The objective of this study was to find the relationship between soil suction potential and moisture change from the Optimum Moisture Content (OMC) to the long-term equilibrium moisture. The sixty-five Seasonal Monitoring Program (SMP) sites in the Long Term Pavement Performance (LTPP) program were employed. Suction potential was evaluated using the Soil Water Characteristic Curve (SWCC) characterized. Moisture change wetting and drying from OMC was identified. Maximum wetting moistures are 15.3 and 19.9 percent from OMC and maximum drying moistures are -10.3 and -15.4 percent from OMC for flexible and rigid pavements, respectively. Once reaching equilibrium, the moisture variations were mostly less than 1 percent in terms of gravimetric moisture. OMC has a significant correlation to the percentage passing at 0.02 mm sieve size. As suction potential increased, subgrade became more wetted. The characteristic was more noticeable in rigid than flexible pavements. Groundwater table and precipitation were found not to be dominant factors in causing long-term moisture changes.
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Pavement Roughness Index Impact for Specific Wavebands and Causative Factors
Abraham Bae,Shelley M. Stoffels 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.5
This study quantified roughness for individual wavebands in the long wavelength range in pavement longitudinal profiles. Particularly, the roughness was related with quantified plausible factors associated with those wavebands. Root Mean Square (RMS) roughness defined under the Power Spectral Density (PSD) profile in the frequency domain was used as a quantified index that can reflect detailed roughness information for a specific waveband. A method to interpret the quantified roughness in terms of the International Roughness Index (IRI) was also developed. It was demonstrated that the RMS roughness evaluated in individual wavebands under the PSD function can be technically interpreted in terms of IRI. Thus, the interpreted IRI could be directly explained by the quantified plausible factors. It was concluded that the demonstrated method can contribute to improved roughness prediction models the Mechanistic-Empirical Pavement Design Guide (MEPDG) with smoothness characteristics in detailed wavelengths underpinnings in future generations of pavement design models.
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Economic Effects of Microsurfacing on Thermally-Cracked Pavements
Abraham Bae,Shelley M. Stoffels 대한토목학회 2008 KSCE JOURNAL OF CIVIL ENGINEERING Vol.12 No.3
The exclusive effects of microsurfacing on thermal cracks were quantified in terms of IRI. In addition, vehicle operating costsrelated to the IRI were estimated. For the MnROAD project, using a measurement device with high resolution, pavement surfaceswith thermal cracks were profiled before and after microsurfacing. The crack profiles were transferred into longitudinal profiles withno cracks so that the exclusive contribution of original and microsurfaced cracks to roughness could be analyzed. Then, vehicleoperating costs corresponding to the exclusive roughness were evaluated. Applying the given amount of microsurfacing materials,the IRI resulting from cracks with 0.7 cm depth and 0.58 m width was reduced by about 80 percent for serviceable roughness levels.1.8 cm depth and 0.80 m width were decreased by about 60 percentand about 45 percent, respectively. By examining vehicle operating costs, it was found that a small difference in crack severitiesresults in a greater increase in cost. Therefore, it was concluded that prompt operation of microsurfacing for any crack severity levelsis no less important than earlier operation for low severity cracks. In addition, it was concluded that microsurfacing can be a cost-effective maintenance technique for cracks for a year. If more than 3 cracks would be detected in the field, microsurfacing would bestill a cost-effective maintenance method for any severity crack level.
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