• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 춘계 학술논문 발표대회
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• pp.216-217
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• 2018

The three kinds of tests are used to further study the effect of the amount of mineral powder in this mixture design. Firstly, comparing the relationship of the content of mineral powder and asphalt bitumen membrane thickness at different asphalt content, through film thickness to determine the range of gradation and asphalt content in laboratory tests, Grade A and Grade D, asphalt content 2.6%, 3.4% and 3.8% are set for the benchmark, then fatigue properties of the test are carried out in the established range, the result show that asphalt film thickness decreases with the addition of mineral powder. The result also show that fatigue properties of asphalt rubber mixture will reduced, when mineral powder added in, especially when the asphalt content is high.

• 한국건설순환자원학회지
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• 제15권1호
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• pp.16-25
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• 2020

• 한국도로학회논문집
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• 제19권5호
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• pp.13-20
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• 2017

PURPOSES : This research was a laboratory study for evaluating the Reclaimed Asphalt Pavement (RAP) mixture added developed rejuvenator for warm mix recycling. Waste asphalt mixtures occupy about 18.2% of construction wastes in Korea. Moreover, most rejuvenators were imported from Europe or the U.S. Therefore, improving usage of RAP with a developed rejuvenator material provides environmental protection at a reduced cost. METHODS : The specimen used for this experiment was performed by only using RAP. A suitable rejuvenator for Target PG was then added. In addition, a conventional rejuvenator was selected to compare performance and specimens introduced with the same procedure as the developed rejuvenator was prepared. In order to evaluate rutting resistance and water susceptibility, we conducted a deformation strength test, a tensile strength ratio test, and a dynamic immersion test with the prepared mixtures. RESULTS :Laboratory test results indicated that both the developed additive and conventional additive improved performance of the recycled asphalt mixtures compared to mixtures without the rejuvenator. In addition, the deformation strength test and TSR test results satisfied standards for domestic recycling asphalt mixtures. The dynamic immersion test showed that the developed rejuvenator has superior scaling resistance than the conventional rejuvenator. CONCLUSIONS : In terms of rutting resistance and moisture susceptibility, the warm mix recycled asphalt mixtures with the developed rejuvenator appeared to effectively recovered performance.

• 한국도로학회논문집
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• 제16권4호
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• pp.63-74
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• 2014

PURPOSES: This research is to evaluate the mechanical performance of different types of Hot Mix Asphalt (HMA) pavement cells prepared for MN/Road field testing section through an extensive experimental analysis of air voids and simple statistical evaluation tools (i.e. hypothesis test). METHODS: An extensive experimental work was performed to measure air voids in 82 asphalt mixture cores (238 samples in total) obtained from nine different types of road cell located in MN/Road testing field. In order to numerically and quantitatively address the differences in air voids among the different test Cells built in MN/Road, a simple statistical test method (i.e. t-test) with 5% significance was used. RESULTS: Similar trends in air voids content were found among the mixtures including conventional HMA, Reclaimed Asphalt Pavement (RAP) and Warm Mix Asphalt (WMA) combined with taconite aggregate this provides support to the use of RAP and WMA technology in the constructions of asphalt pavement. However, in case of acid modified HMA mixtures, significant differences in air void content were observed between on the wheel path and between wheel path location, which implies negative performances in rutting and thermal cracking resistances. Conclusions : It can be concluded that use of RAP and WMA technology in the construction of conventional asphalt pavement and the use of PPA (Poly Phosphoric Acid) in combinations with SBS (Styrene Butadiene Styrene) in asphalt binder production provide satisfactory performance and, therefore, are highly recommended.

• 한국도로학회논문집
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• 제12권4호
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• pp.111-120
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• 2010

본 연구는 준고온 공법을 이용한 재생 아스팔트 콘크리트의 강도특성을 평가하기 위해 이루어졌다. 굵은 골재 최대치수 13mm의 화강암과 침입도 60-80인 신규 바인더 60-80을 재생 혼합물을 제조하는데 사용하였다. 배합설계는 RAP(굵은 입자 : 잔입자=6 : 4) 첨가비율 20%와 30%를 사용하였고 GPC, 침입도, 절대점도, 동점도를 준고온 첨가제(Evotherm와 Sasobit)의 첨가 함량을 결정하기 위하여 측정하였다. LD(low-density poly ethylene)를 본 연구에서 준고온 재생 아스팔트 혼합물의 개질제로 사용하였다. 본 연구에서는 8개의 준고온 재생 혼합물(2 RAP함량 ${\times}$ 2 준고온 첨가제 ${\times}$ 2 개질제)뿐만 아니라 2개의 일반 재생 혼합물, 1개의 가열혼합 일반혼합물(control)까지 총 11개의 혼합물을 제조하였다. 변형강도 시험, 간접인장강도 시험, 수분민감성 시험, wheel tracking을 통한 소성변형 시험을 준고온 재생혼합물의 기본 특성을 평가하기 위하여 수행하였다.

• 한국도로학회논문집
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• 제20권1호
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• pp.27-33
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• 2018

PURPOSES : The purpose of this study is to estimate the optimum content of an inorganic additive for cold-recycled asphalt mixtures and evaluate its performance. METHODS : An indirect tensile test, a tensile-strength ratio test, and an indirect tensile-fatigue test were conducted on cold-recycling asphalt mixtures with various additives. RESULTS : The laboratory performance tests indicated that granulated blast-furnace slag mixed with inorganic and cement activators provided optimum performance. The performance results of the cold-recycled asphalt pavement were similar to the inorganic and cement activators' performance in terms of the indirect tensile strength, tensile strength ratio, and indirect tensile-fatigue test. CONCLUSIONS : Overall, the performance of a cold-recycled asphalt mixture using inorganic additives and emulsion asphalt was comparable to a warm-recycled asphalt mixture. However, more experiments aimed at improving its performance and studying the effect of the inorganic additives must be conducted.