Eutrophication and algal blooms can lead to increase of taste and odor compounds and health problems by cyanobacterial toxins. To cope with these eco-social issues, Ministry of Environment in Korea has been reinforcing the effluent standards of wastewater treatment facilities. As a result, various advanced phosphorus removal processes have been adopted in each wastewater treatment plant nation-widely. However, a lot of existing advanced wastewater treatment processes have been facing the problems of expensive cost in operation and excessive sludge production caused by high dosage of coagulant. In this study, the sedimentation and dissolved air flotation (SeDAF) process integrated with sedimentation and flotation has been developed for enhanced phosphorus removal in wastewater treatment facilities. Design and operating parameters of the SeDAF process with the capacity of 100 m3/d were determined, and a demonstration plant has been installed and operated at I wastewater treatment facility (located in Gyeonggi-do) for the verification of field applicability. Several empirical evaluations for the SeDAF process were performed at demonstration-plant scale, and the results showed clearly that T-P and turbidity values of treated water were to satisfy the highest effluent standards below 0.2 mg/L and 2.0 NTU stably for all of operation cases.

To remove phosphorus from the effluent of public wastewater treatment facilities, hundreds of enhanced phosphorus treatment processes have been introduced nationwide. However, these processes have a few problems including excessive maintenance cost and sludge production caused by inappropriate coagulant injection. Therefore, the optimal decision of coagulant dosage and automatic control of coagulant injection are essential. To overcome the drawbacks of conventional phosphorus removal processes, the integrated sedimentation and dissolved air flotation(SeDAF) process has been developed and a demonstration plant(capacity: 100 m3/d) has also been installed. In this study, various jar-tests(sedimentation and / or sedimentation·flotation) and multiple regression analyses have been performed. Particularly, we have highlighted the decision–making algorithms of optimal coagulant dosage to improve the applicability of the SeDAF process. As a result, the sedimentation jar-test could be a simple and reliable method for the decision of appropriate coagulant dosage in field condition of the SeDAF process. And, we have found that the SeDAF process can save 30 – 40% of coagulant dosage compared with conventional sedimentation processes to achieve total phosphorus (T-P) concentration below 0.2 mg/L of treated water, and it can also reduce same portion of sludge production.

Dentin hypersensitivity (DH) is defined as short and sharp pain caused by external stimuli such as heat, vaporization, contact, osmotic pressure, and chemical stimulation in a normal tooth, rather than due to disease or tooth damage. Its solution is to block the flow of dentinal fluid by physically blocking the dentinal tubule. Of these treatments, fluoride and oxalate type for hypersensitivity can only have a temporary effect. Resins should be used with a suitable bonding system and they may cause hypersensitivity symptoms after treatment. Overcoming these limitations, there is a need for method that can effectively treat dental hypersensitivity lasting long without any side effects. For this reason, experiments with 200 plant extracts as candidates for dentin hypersensitivity, Buddleja officinalis was considered as a candidate for present study. The purpose of this study is to confirm whether the ethanol extract of Buddleja officinalis is effective to protect enamel and dentin by coating tooth surface and resistance to acid or alkali even after tooth coating.

PURPOSES : This study establishes a pay adjustment factor scheme that will penalize or provide incentives to contractors after pavement construction in Seoul City. METHODS: Random sampling was conducted, wherein acceptable quality characteristics (AQCs) of the field mixture such as the aggregate gradation, asphalt binder content, pavement thickness, field air void, and IRI (International Roughness Index) were determined. Using the acquired field data, the percent within limit (PWL) values of each AQC were determined. RESULTS : Weight factors were used to consider the effect of each AQC, since field data varies depending on the field condition. The total pay factor (PF) was determined by combining the PF material and PF construction. PF material considers the asphalt binder content and the aggregate gradation, while PF construction considers the field air void, pavement thickness, and field IRI. CONCLUSIONS: A pay adjustment factor was established by determining the PWL of each AQC and calculating the corresponding pay factor. Based on the results, it is found that PWL is a reasonable and acceptable method for evaluating the pavement quality and determining the pay factor.

The algal blooms in stagnant streams and lakes have caused many problems. Excessive algae leads to disturbance of ecosystem and overload of water treatment processes. Therefore, phosphorus(P), source of algal blooms, should be controlled. In this study, a filtration trench has been developed to convert dissolved phosphorus into hydroxyapatite(HAP) so that it could be crystallized on the surface of ‘phosphorus removal granular material’; and residual particulate phosphorus could be removed by additional precipitation and filtration. The front and rear parts of filtration trench consisted of ‘phosphorus removal granular material contact bed’ and ‘limestone filtration bed’, respectively. As a result of the column test using phosphorus removal granular material and limestone serially, PO4-P was removed more than 90% when EBCT(empty bed contact time) of the contact bed was over 20 minutes; and T-P represented 60% of removal efficiency when total EBCT was over 1.5 hours. The results of column tests to figure out the sedimentation characteristics showed that more than 90% of particulate phosphorus could be removed within 24 hours. It was necessary to optimize the filtration part in order to increase removal efficiency of T-P additionally. Also, it was confirmed through the simulation of Visual MINTEQ that most of particulate phosphorus in the column tests is the form of HAP. Based on the results of the study, it could be suggested that the design parameters are over 0.5 hour of EBCT for phosphorus removal granular material contact bed and over 1.5 hours of EBCT for limestone filtration bed.

Water quality improvement processes for stagnant area consist mainly of technologies applying vegetation and artificial water circulation, and these existing technologies have some limits to handle pollution loads effectively. To improve the purification efficiency, eco-friendly technologies should be developed that can reinforce self-purification functions. In this study, a multi-functional floating island combined with physical · chemical · biological functions (① flotation and oxidization using microbubbles, ② vegetation purification and ③ bio-filtration with improved adsorption capacity) has been developed and basic experiments were performed to determine the optimal combination conditions for each unit process. It has been shown that it is desirable to operate the microbubble unit process under conditions greater than 3.5 kgf/cm2. In vegetation purification unit process, Yellow Iris (Iris pseudacorus) was suggested to be suitable considering water quality, landscape improvement and maintenance. When granular red-mud was applied to the bio-filtration unit process, it was found that T-P removal efficiency was good and its value was also stable for various linear velocity conditions. The appropriate thickness of filter media was suggested between 30 and 45 cm. In this study, the optimal design and operating parameters of the multi-functional floating island have been presented based on the results of the basic experiments of each unit process.

The annual total phosphorus load caused by public wastewater, nightsoil and livestock manure treatment facilities in Korea has been examined macroscopically. Annual domestic average phosphorus (P) inflows through the income of phosphate rock for the last five years (2012 - 2016) were analyzed as 76,598 tons/year. As of the year 2015, the total loadings of phosphorus attributed to public wastewater treatment facilities, nightsoil treatment facilities and livestock wastewater were estimated as 30,269 tons/year, 1,909 tons/year and 18,138 tons/year, respectively. Considering the amount of phosphorus imports, the annual phosphorus load from wastewater, livestock wastewater and excretions is equivalent to 39.5%, 23.7%, 2.5% and totally 65.7%(39.5% + 23.7% + 2.5%). Therefore, the introduction of phosphorus recovery and recycling processes for the public wastewater and livestock manure treatment facilities has been found to be effective because it could reduce the import amount of phosphate rock by up to 60% or more.

PURPOSES : The objective of this study is to develop a pavement rehabilitation decision tree considering current pavement condition by evaluating severity and distress types such as roughness, cracking and rutting. METHODS: To improve the proposed overall rehabilitation decision tree, current decision tree from Korea and decision trees from other countries were summarized and investigated. The problem when applying the current rehabilitation method obtained from the decision tree applied in Seoul was further analyzed. It was found that the current decision trees do not consider different distress characteristics such as crack type, road types and functions. Because of this, different distress values for IRI, crack rate and plastic deformation was added to the proposed decision tree to properly recommend appropriate pavement rehabilitation. Utilizing the 2017 Seoul pavement management system data and considering all factors as discussed, the proposed overall decision tree was revised and improved. RESULTS: In this study, the type of crack was included to the decision tree. Meanwhile current design thickness and special asphalt mixture were studied and improved to be applied on different pavement condition. In addition, the improved decision tree was incorporated with the Seoul asphalt overlay design program. In the case of Seoul's rehabilitation budget, rehabilitation budget can be optimized if a 25mm milling and overlay thickness is used. CONCLUSIONS: A practical and theoretical evaluation tool in pavement rehabilitation design was presented and proposed for Seoul City.

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.

One of the major sources causing eutrophication and algal blooms of lakes or streams is phosphorus which comes from point and nonpoint pollution sources. HAP (hydroxyapatite) crystallization using granular alkaline materials can achieve the decrease of phosphorus load from wastewater treatment plants and nonpoint pollution control facilities. In order to induce HAP crystal formation, continuous supply of calcium and hydroxyl ions is required. In this research, considering HAP crystallization, several types of lime-based granular alkaline materials were prepared, and the elution characteristics of calcium and hydroxyl ions of each were analyzed. Also, column tests were performed to verify phosphorus removal efficiencies of granular alkaline materials. Material_1 (gypsum+cement mixed material) achieved the highest pH values in the column tests consistently, also, Material_2 (gypsum+slag mixed material) and Material_3 (calcined limestone material) achieved over pH 9.0 for 240 hours (10 days) and proved the efficiencies of long-term ion supplier for HAP crystallization. In the column tests using Material_3, considerable pH increase and phosphorus removal were carried out according to each linear velocity and filtration depth. T-P removal efficiencies were 87.0, 84.0, 68.0% and those of PO4-P 100.0, 97.0, 80.0% for linear velocity of 1.0, 2.5, 5.0 m/hr respectively. Based on the column test results, the applicability of phosphorus removal processes for small-scale wastewater treatment plants and nonpoint pollution control facilities was found out.

PURPOSES : The objective of this study is to develop a simple regression model in designing the asphalt concrete (AC) overlay thickness using the Mechanistic-empirical pavement design guide (MEPDG) program. METHODS: To establish the AC overlay design equation, multiple regression analyses were performed based on the synthetic database for AC thickness design, which was generated using the MEPDG program. The climate in Seoul city, a modified Hirsh model for determining dynamic modulus of asphalt material, and a new damaged master curve approach were used in this study. Meanwhile, the proposed rutting model developed in Seoul city was then used to calibrate the rutting model in the MEPDG program. The AC overlay design equation is a function of the total AC thickness, the ratio of AC overlay thickness and existing AC thickness, the ratio of existing AC modulus and AC overlay modulus, the subgrade condition, and the annual average daily truck traffic (AADTT). RESULTS: The regression model was verified by comparing the predicted AC thickness, the AADTT from the model and the MEPDG. The regression model shows a correlation coefficient of 0.98 in determining the AC thickness and 0.97 in determining AADTT. In addition, the data in Seoul city was used to validate the regression model. The result shows that correlation coefficient between the predicted and measured AADTT is 0.64. This indicates that the current model is more accuracy than the previous study which showed a correlation coefficient of 0.427. CONCLUSIONS: The high correlation coefficient values indicate that the regression equations can predict the AC thickness accurately.

서울시 도로포장은 대부분 30년 이상 노후화된 포장으로서 이미 구조적 손상이 많이 진행된 상태이고, 기후변화로 인한 강수량 증가 등 환경적 요인으로 인해 포장 파손이 최근 급격히 증가하고 있다. 또한 설계당시의 포장 단면 두께가 현재의 교통량을 반영하지 않아 상당히 부족한 상태이다. 서울시의 버스교통량이 증가함에 따라 중차량에 의한 교통하중이 증가하고 기존 도로포장에 버스전용차로를 도입하여 중차량 교통하중이 집중되는 현상이 발생하고 있다. 이에 서울시는 도로파손을 해결하기 위해 아스팔트 도로포장의 두께와 다양한 아스팔트 혼합물을 적용하고 있다. 하지만 중차량 교통하중 집중현상, 교차로 및 버스정류장에서는 차량속도 감속으로 인해 소성변형이 발생하고 있다. 최근, 해외의 여러 기관에서는 소성변형 예측 모형 개발 또는 기존 모형을 개선하여 소성변형으로 인한 도로포장 파손을 예측하는 연구가 진행중이다. 이러한 모형들은 소성변형을 발생시키는 주요 원인을 고려하여 개발하였으며 이는 소성변형에 대한 도로포장의 수명 및 성능 변화를 예측하여 유지보수 공법과 적용 시기를 결정한다. 본 연구에서 개발한 소성변형 예측 모형은 하중재하 속도 및 횟수, 아스팔트 포장층 온도, 전단응력과 강도의 비율을 고려하여 개발하였다. 전단응력과 강도의 비율은 아스팔트 혼합물의 응집력과 마찰각의 영향을 받는 것으로 나타났으며 이를 고려하여 아스팔트 혼합물 물성을 활용한 다중 회귀분석을 적용하였다. 개발된 소성변형 예측 모형을 검증하기 위해 Westrack 자료를 활용하였으며 2.35%의 오차율을 보였고 LTPP 자료를 활용하였을 때는 1.19%의 오차를 보여 매우 높은 신뢰성을 보였다. 개발된 소성변형 예측 모형을 활용하여 아스팔트 혼합물 배합설계와 지불계수에 적용하였다. 배합설계의 경우, 교통량 및 차량속도와 같은 인자를 고려하여 최적의 아스팔트 바인더 함량을 결정할 수 있음을 확인할 수 있었다. 또한 소성변형 예측 모형을 적용하여 설계 공용수명 대비 공용수명의 비율을 적용하여 아스팔트 혼합물의 지불계수를 결정할 수 있다

PURPOSES:The objective of this study is to evaluate the performance of asphalt mixtures containing inorganic additive and a high content of reclaimed asphalt pavement (RAP).METHODS:The laboratory tests verified the superior laboratory performance of inorganic additive compared to cement, in cold recycled asphalt mixtures. To investigate the moisture susceptibility of the specimens, tensile strength ratio (TSR) tests were performed. In addition, dynamic modulus test was conducted to evaluate the performance of cold recycled asphalt mixture.RESULTS:It was determined that NaOH solution mixed with Na2SiO3 in the ratio 75:10 provides optimum performance. Compared to Type B and C counterparts, Type A mixtures consisting of an inorganic additive performed better in the Indirect tensile strength test, tensile strength ratio test, and dynamic modulus test.CONCLUSIONS:The use of inorganic additive enhances the indirect strength and dynamic modulus performance of the asphalt mixture. However, additional experiments are to be conducted to improve the reliability of the result with respect to the effect of inorganic additive.

PURPOSES:The objective of this study is to evaluate the effect of anti-stripping on asphalt mixtures constituting anti-stripping agents.METHODS:Based on the literature review, asphalt mixture added with anti-stripping agents was prepared, and these asphalt mixtures were evaluated for anti-stripping properties for each anti-stripping agent through various lab tests, namely, tensile strength ratio (TSR), dynamic immersion test, uniaxial compression test, and indirect tensile strength test (IDT). The liquid anti-stripping agents used in the lab test were premixed with each asphalt binder (PG 64-22, PG 76-22) before being mixed with the aggregate.RESULTS:The result of the TSR test revealed that the effect of anti-stripping was highest when hydrated lime and liquid anti-stripping agent W were added. The correlation coefficient R2 between the TSR result and cohesion ratio is 0.99, which indicates that the sensitivity of the TSR to moisture damage is reliable from the mechanical point of view. The covering ratio of the asphalt binder to the liquid anti-stripping agent W was determined to be higher than that to the other liquid anti-stripping agents.CONCLUSIONS:It is considered that the improved moisture resistance of asphalt mixture as a result of the use of anti-stripping agents can reduce the incidence of various pavement damages such as portholes caused by stripping, and the performance life of the asphalt road pavement can be prolonged.

In the coagulation/sedimentation (C/S) process of the water treatment process, the inflow of massive algal bloom causes many problems including fouling of filter media. This study was conducted to find out the way to remove the algae’s harmful effects by addition of pre-treatment prior to C/S process. Many Jar-tests were conducted such as ① ACF (Algae Coagulation·Flotation) process using natural algae coagulant (Water Health®), ② ACF + C/S process and ③ C/S process with a variety of conditions using cultured algae. The average values of turbidity were ① 0.42 NTU for ACF process, ② 0.13 NTU for ACF + C/S process and ③ 0.25 NTU for C/S process. It was shown that the treatment efficiency of ACF process could get low turbidity results, and ACF + C/S process could achieve more efficient results than those of C/S process. Any negative effects of ACF process to the efficiency of C/S process were not observed in ACF + C/S process. In order to reduce the unfavorable effects of algae, it was found out that the introduction of ACF process in the forms of ① ACF or ② ACF + C/S could be one of the effective and alternative solutions.

국내에서 발생하는 폐아스팔트 콘크리트는 2013년 기준 1,291만톤 발생하였고, 재활용(순환) 아스콘 생 산없체는 점점 증가하는 추세로 아스콘(신재)대비 재활용아스콘의 사용비율은 매년 증가하는 것을 알 수 있으나 상온 재생 아스팔트의 사용은 미비한 실정이다. 현재 정부는 재활용아스콘 사용량을 2020년까지 50%이상 의무사용량을 증가시키는 규정을 제정하였고, 2015년 파리기후협약으로 우리나라는 2030년까 지 배출전망치대비 37%의 감축 목표를 가지고 있다. 상온 재활용 아스팔트의 첨가제를 시멘트로 사용시 취성에 약하며 또한 시멘트 생산과정에서 다량의의 온실가스가 발생하고, 일부 상온 재생 아스팔트 포장에서 다량의 시멘트 사용으로 인하여 포장의 조기 균 열과 상온 재생 아스팔트 혼합물의 장기간 양생으로 인하여 조기 교통개방이 불가능하여 주로 신설포장의 기층용 혼합물로 사용되고 있다. 따라서 상온 재생 아스팔트 혼합물의 양생시간을 단축하고 조기에 고강도를 발현시킬 수 있는 속경화 성 고성능 무시멘트계 첨가제의 개발이 필요하다. 무시멘트 첨가제 사용 및 폐아스콘 재활용률 증가로 온 실가스 배출저감 효과 극대화, 조기 교통개방 가능, 신설뿐만 아니라 유지보수 공사에도 적용하여 폐아스 콘의 사용량 증가 및 중교통도로에도 적용이 가능할 것으로 판단한다. 본 연구에서는 첨가제 ʻA, B, Cʼ를 혼합하여 자체적으로 무시멘트 첨가제를 개발하였으며 이를 상온 재생 아스팔트에 적용하여 가열 재생 아스팔트 및 시멘트가 첨가된 상온 재생 아스팔트와 실내 공용성을 비교분석 하였다. 실내 공용성 분석을 위한 시편을 제작하기에 앞서 3가지의 비교군을 선정하고 각각의 혼합물은 선회다짐기와 마샬다짐기를 이용하여 시편제작을 하였다. 앞서 선정된 상온 재생 아스팔트 혼합 물의 배합비와 시편의 제작순서를 결정한 후 선회다짐기를 사용하여 높이 100㎜, 지름 150㎜의 선회다짐 시편을 시편을 제작하였으며 이를 높이 50㎜로 성형 후 실내 공용성 시험을 진행하였다. 공용성 평가를 위하여 진행한 시험으로는 동탄성계수 시험과 간접인장강도 시험, 아스팔트 혼합물의 수분저항성(TSR) 시험 등을 통해 무시멘트 첨가제를 사용한 상온 재생 아스팔트 외 2가지의 혼합물에 대 한 시험을 진행하였다. 동탄성계수 시험은 5개의 온도조건과 6개의 하중주기를 통하여 다양한 조건을 모사하여 혼합물의 점탄 성 특성을 평가하는 시험방법으로 간접인장방식을 통하여 ｜E*｜와 Master Curve의 시험결과를 도출하였 으며, 물 함유량이 큰 시편은 제작 후 절단할 때 손상이 심하여 동탄성계수 시험을 진행하지 못하였다. 간 접인장강도 시험은 직경 100㎜의 공시체를 시험온도인 25℃의 항온건조로에 넣었다가 꺼내어 실험을 진 행하였고 상온 재생 아스팔트는 공극률 7%를 맞추기 어려운 관계로 시편의 공극율을 토대로 70~80%사 이로 감압하여 수분처리 후 간접인장강도 시험을 실시하였다.

A permanent deformation model for asphalt concrete (AC) layers based on shear properties is developed and calibrated in this study. The indirect tensile (IDT) strength and uniaxial compressive strength (UCS) were used to determine the cohesion and friction angle of asphalt mixtures. Five types of asphalt mixtures with various air-void and binder contents are tested under different loadings and temperature conditions. Multiple regression analysis was conducted to develop permanent deformation model of asphalt mixtures which is a function of the air void, binder content, stress, and number of load cycles, temperature, and frequency. The regression model was verified by comparing the predicted and measured plastic strain. It was found out that the regression model has a correlation coefficient of 0.96 in determining plastic strain. Through the field WesTrack database, the permanent deformation model was calibrated to be applied to AC layers. After calibration, it is observed that the correlation coefficient is 0.86 for the measured and predicted rut depth. Finally, the model is validated using the field rutting performance obtained from Long Term Pavement Performance (LTPP) data sets. Based on the validation study, it can be concluded that the proposed model can successfully predict the permanent deformation of various asphalt mixtures in a wide range of loadings and temperature conditions in the field.

현재 서울시의 아스팔트 포장도로의 수명은 20~30년이다. 기존 포장의 지지력에 기반을 둔 덧씌우기 포장의 수명은 이보다 더 짧다. 이에 따른 본 연구는 MEPDG를 활용한 아스팔트 포장 카탈로그 설계법 개발로서 서울형 설계법을 총 3가지 카탈로그(버스전용차로(Ⅰ), 버스전용차로가 운영되는 도로의 일반차 로(Ⅱ), 버스전용차로가 운영되지 않은 도로의 일반차로(Ⅲ))로 분류하여 연구를 진행하였다. 서울시의 각 도로의 종류에 따른 포장 두께는 다음과 같다. 일반차로 약 100mm~260mm를 보이며 130, 160, 180mm가 가장 일반적인 두께로 조사되었다. 반면, 버스전용차로는 약 140mm~290mm를 보 이며 170, 200, 220mm가 가장 일반적인 두께로 조사되었다. 이를 기반으로 본 연구에서는 영국의 포장 설계 카탈로그에 나온 각 도로별 포장두께를 비교하였다. 이를 조사한 결과 현재 한국의 버스전용차로의 아스팔트 포장 두께는 89mm가 부족하고, 일반차로의 아스팔트 포장두께는 84mm가 부족하였다. 덧씌우기 포장의 수명은 서울시의 경우 6.6년이다. 이는 일반국도의 수명인 10년에 비해 3.4년이 짧다. 전체 도로 중 45%가 조시파손이 생기며 이는 4~5년 이내에 발생한다. 조기파손을 구조적인 측면에서 조 사한 결과, 단기 공용성(덧씌우기 수명 5년 미만)의 10개 구간 중 5개의 구간에서 Crack Depth Ratio(CDR)이 1로 조사되었다. 이중 구조적으로 아스팔트 두께가 최대 145mm가 필요한 구간도 있었다. 반면 장기 공용성(덧씌우기 수명 10년 이상)중 가장 큰 CDR 값이 0.6이며 이 중 아스팔트 두께가 최대 95mm가 필요한 구간이 있다. 본 설계법은 도로의 다양한 교통 특색(연간 일일 평균 교통량, 차종별 분포 율 등), 노상층의 상태, 신규재료의 물성값을 MEPDG 프로그램에 활용하여 정립하였다.

2000년대 초반 서해대교와 영종대교가 건설된 이후 국내에서는 섬과 섬, 육지와 섬을 연결하는 장대교량 의 건설이 지속적으로 추진되고 있다. 이러한 장대교량은 대부분 주경간을 케이블로 지지하는 현수교 또는 사장교로 건설되고 있다. 이러한 장대교량의 경우 사하중을 경감하기 위하여 교량상판은 대부분 강상판 형식 으로 건설되고 있다. 강상판에 적용되는 교면포장은 불투수성의 방수성능과 충격 및 진동에 대한 저항성이 우수해야 되기 때문에 유럽과 일본을 비롯하여 국내에서는 일반적으로 매스틱(구스) 아스팔트포장 공법을 두 께 70~80mm(매스틱/매스틱, 개질/매스틱) 내외로 적용하여 시공하고 있고(이진구, 2004), 일반적이지는 않으나 에폭시 아스팔트 또는 폴리머 콘크리트로 두께 50mm이하의 박층 교면포장을 시공하는 사례도 있다. 매스틱 아스팔트 혼합물은 불투수성으로 휨에 대한 적응성이 높기 때문에 일반적으로 강상판 교면포장에 사용되며, 일반 아스팔트 혼합물에 비해서 0.075mm(Filler)이하 미립자의 함량이 17~34% 정도로 높고, 고 점도의 TLA(Trinidad Lake Asphalt)로 인하여 230℃이상의 고온에서 혼합물을 교반하여 시공한다. 특히 고온에서의 교반을 위하여 특수 혼합기인 쿠커(Cooker)를 사용하여 현장에서 매스틱 아스팔트 혼합물을 생 산한다. 매스틱 아스팔트 혼합물은 고온에서 유동성이 우수하여 아스팔트 피니셔(Finisher)로 흘려 넣듯이 포설하기만 하여도 추가적인 다짐 없이 시공을 마무리 할 수 있다. 기존의 매스틱 아스팔트포장은 일반 아스팔트에 고점도의 TLA인 천연 아스팔트를 혼합하여 생산하는데 일반 매스틱 아스팔트포장의 경우 TLA를 전량 외국에서 수입하기 때문에 재료비가 고가이고 물리적인 성질 을 개선하기가 상당히 어려운 실정이다. 이러한 문제를 극복하기 위한 대안으로 SBS 개질재를 혼합한 개질 매스틱아스팔트 및 다양한 재료에 대해 연구 사용하고 있다. 본 연구에서는 매스틱 아스팔트 포장과 TLA, SBS개질재가 첨가되지 않는 친환경적이고 경제적인 폐아스 콘을 혼합한 재생매스틱 아스팔트를 비교해본다. 배합설계를 위해 폐아스콘에 신규골재와 신규 바인더를 첨 가한 재생 매스틱 아스팔트를 고온에서의 안정성을 평가하는 관입량 시험과 혼합물의 반죽질기를 평가하여 시공성능을 가늠하기 위한 류엘 유동성 시험, 혼합물의 배합설계 및 품질 관리시 내유동성을 평가하는 동적 안정도 시험을 하였다.