• International Journal of Highway Engineering
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• v.7 no.1 s.23
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• pp.63-71
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• 2005

Asphalt binder grading is to specify quality of asphalt binders relating to pavement performance in orderly manner, and provides the necessary information in selecting the appropriate asphalt binder for the hot mix design. For this purpose, United States has developed the PG-grading in 1995 and is implementing in practice. Recently, this American PG-grading system has been accepted as the domestic binder grading specification. However, the Asian (including Japan and China) and the most European countries are still use the traditional penetration and viscosity specification. The goal of this study lies in analysing the American PG-grading for its justification. As the result, the serious errors are found, and thus, to eliminate the errors, the more precise binder grading equation is introduced, Credibility of this study is checked by predicting the literature rut data with the equations mentioned. The prediction result are validating the claimes made in this study.

• International Journal of Highway Engineering
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• v.3 no.2 s.8
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• pp.91-102
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• 2001

On the basis of several experiments peformed, Bahia et al. (1998) concluded that the current Superpave PG-grading system failed to characterize grading specification of fill modified binders. This conclusion motivates us to investigate the correct grating system suited for modified asphalt binders. The main concept of this development is originated from the relationship between rut depth and binder properties at high temperatures. A new grading system for modified asphalt binders suggested here somewhat resembles to the unmodified binder grading one developed by Huh et al. (2000). Thus, this investigation will provide a unified single theoretical equation of high temperature grading that can apply both to modified and unmodified binders, and will check its effectiveness with the laboratory and the field rut data reported by independent studies. Successful results observed may allow to construction of a correct grading system in the near future.

• Proceedings of the Korea Concrete Institute Conference
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• 2002.05a
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• pp.111-116
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• 2002

Permeable polymer concrete has a lot of internal voids, which has more excellent performance in permeability and durability than asphalt and cement concrete. Therefore, in this paper, influences of grading distribution of aggregates on the permeable polymer concrete are presented using polyester resin as binders. According to test results, it shows that compressive strength and unit weight increase with continuous grading distribution and increase of binder content, while void and permeability coefficient shows decline tendency.

• 한국도로학회:학술대회논문집
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• 2002.10a
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• pp.111-118
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• 2002

• 한국도로학회:학술대회논문집
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• 2004.10a
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• pp.131-136
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• 2004

• 한국도로학회:학술대회논문집
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• 2003.10a
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• pp.229-234
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• 2003

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05b
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• pp.525-528
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• 2005

This study determines the best composite grade to minimize the void of aggregate mixture based on the maximum density theory in an attempt to suggest a mix proportion method design for asphalt mixtures. Study results show that the grading curve with the maximum mass per unit capacity of each aggregate mixture satisfied the KS standards and the optimum AP content to meet the optimal asphalt mixture void rate of 4$\%$ was 5.7$\%$, less than the optimum AP content of 6.5$\%$ suggested in the Marshal mix proportion method design. At the same time, the asphalt mixture produced based upon the suggested mix proportion method had a flow value 17$\%$ lower than that of asphalt mixture produced according to the Marshal method, while its density was greater by 0.06$\～$0.09. This suggests that the introduced mix proportion method design helps to improve the shape flexibility and crack-resistance of asphalt concrete.

• 한국도로학회:학술대회논문집
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• 2011.03a
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• pp.39-44
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• 2011

• Journal of the Korean Recycled Construction Resources Institute
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• v.6 no.3
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• pp.199-206
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• 2018

Due to the advantages of less raw materials and fossil fuel consumption, lower carbon footprint, and the capability of pavement performance improvement, the recycling technology of asphalt is developed and applied for road rehabilitation and construction in the western countries over the past two decades. Cold recycled asphalt mixtures are bituminous materials normally made by mixing recycled aggregate from wasted asphalt with an asphalt emulsion and water at room temperature. This paper aims at investigating the properties of cold recycled asphalt mixture with alkali-activated filler according to wasted asphalt aggregate content. As a result, as the content of wasted asphalt aggregate increased, the marshall stability of cold recycled asphalt mixture decreased and void ratio increased. Also, grading curves for cold recycled asphalt mixture as specified in GR criteria were satisfied in all aggregate mixing conditions regardless of the wasted asphalt aggregate content.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.11a
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• pp.141-146
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• 2001

Permeable polymer concrete has a lot of internal voids, which has more excellent performance in permeability and durability than asphalt and cement concrete. Therefore, in this paper, influences of grading distribution of aggregates on the permeable polymer concrete are presented using polyester resin as binders. According to test results, it shows that compressive strength and unit weight increase with continuous grading distribution and increase of binder content, while void and permeability coefficient shows decline tendency