PURPOSES : Surface treatment material for pavement preventive maintenance should be inspected field applicability. This study(Part Ⅱ) aimed to checkup coating characteristics and performance analysis using lab and field tests. The hydrophobic - low viscosity filling material for pavement preventive maintenance is presented in Part Ⅰ, which is a series of companion study. METHODS: Relative comparison between general asphalt mixtures and surface treatment asphalt mixtures are analyzed and measured for the field application such as indirect tensile strength ratio(TSR), abrasion resistance, crack propagation resistance, temperature resistance, coating thickness, permeability resistance and skid resistance in terms of british pendulum number(BPN). RESULTS: It is found that TSR, crack propagation resistance and permeability resistance is increased as against uncoated asphalt specimen. Abrasion resistance and temperature resistance is secured from the initial coating thickness point of view, which is about 0.2~0.3mm. Skid resistance on the surface treatment pavement is satisfied with the BPN criteria of national highway because of exposed aggregate and crack sill induced pavement deterioration and damage cracks. CONCLUSIONS : The hydrophobic - low viscosity surface treatment material for pavement preventive maintenance is validated on field applicability evaluation based on quantitative analysis of coating thickness and performance analysis using lab and field tests.

PURPOSES: This research investigates traffic noise characteristics as change the transverse rumble strips shape from rectangular to cylinder at toll plaza of highway. METHODS : The traffic noise was investigated at two different places at toll plaza of highway. One is modified grooving, another is employed cylinder shape of TRS instead of rectangular shape of TRS. A measurement of traffic noise was conducted at same location and time period. The traffic volume information was gotten from office of highway office and vehicle speed was measured by speed measuring device. The traffic noise measurement was conducted from 13:00 to 23:00 and by pass-by method. Also, the traffic noise was measured behind noise barrier. Various distance from noise barrier(7.5m, 30m, 50m) and different heights(1.2m, 3m, and 5m) were parameter for measurement of traffic noise in this study. RESULTS : The class 1 vehicle was contributed from traffic volume which was increased 1,500. However, the distribution of traffic speed didn’t change compare to previous investigated period. From this study, It was found that the external traffic noise was changed as function of geometric shape of TRS. The external noise from modified grooving was less than 1.2dB(A) of the current TRS. A difference of traffic noise was 20dB(A) before and after barrier. It came from a noise barrier effect as reduction of traffic noise. According to investigate a traffic noise distribution near barrier, there is similar noise characteristic as function of height at 7.5m distance from noise barrier. Also, There is no different traffic noise between 30m and 50m from source of the noise of sound barrier. CONCLUSIONS: Based on this traffic noise investigation result, there is a clear characteristic difference as changed TRS shape. The traffic noise was reduced by changed TRS shape. Specially, traffic noise was decreased although the traffic volume was increase for same investigation time and period. It is implied that cylinder type of TRS significantly reduces the traffic noise. The specification of various TRS will be studied in the future.

This study examined the growth performance and field evaluation of the dual herbicide-resistant transgenic creeping bentgrass plants. The effect of glyphosate treatment on the herbicide resistance of the transgenic creeping bentgrass plants was determined, and the non-transgenic control plant withered at the concentration 11 μg/mL or higher whereas the transgenic creeping bentgrass plants survived the treatment at the concentration of 3,000 μg/mL, and the increase of the plant length was repressed as the glyphosate treatment concentration was increased. At field evaluation, glufosinate-ammonium and glyphosate were simultaneously treated to investigate the weed control effect. The results showed that more than 90% of the weeds withered four week after herbicide treatment, while the transgenic creeping bentgrass plants continued to grow normally. Therefore, the dual herbicideresistant creeping bentgrass plants may be able to greatly contribute to the efficiency of weed control and to the economic feasibility of mowing in places such as golf courses.

PURPOSES : The purpose of this study is to evaluate of field application and laboratory performance of warm-mix asphalt (WMA) according to the dosage rate of organic-based WMA additive. METHODS: Three asphalt mixtures, i.e., hot mix asphalt (HMA), WMA with the dosage rate of 1.5%, WMA with the dosage rate of 1.0%, were sampled from the asphalt plant when the field trial project were constructed. With these mixtures, the laboratory testings were performed to evaluate the linear viscoelastic characteristics and the resistance to moisture, rutting and fatigue damage. RESULTS : From the laboratory test results, it was found that the WMA with the reduced dosage rate of additive would be comparable to HMA and WMA with the original dosage rate in terms of the dynamic modulus, tensile strength ratio, rutting resistance. However, the fatigue reisistance of WMA with the reduced dosage rate was slightly worse but it should be noted that the fatigue performance is necessarily predicted by combining the material properties and pavement structure. CONCLUSIONS: Through the field construction and laboratory testings, the dosage rate of organic-based WMA additive could be reduced from 1.5% to 1.0% without the significant decrease of compactability and laboratory performance. The long-term performance of the constructed pavement will be periodically monitored to support the findings from this study.

PURPOSES : This study evaluated the field applicability and laboratory performance of warm-mix asphalt (WMA) as an alternative technology in asphalt pavement. METHODS : The pilot road using two different types of WMA mixture and one HMA mixture was constructed in Waegwan-Seokjeok road construction site and the mixtures were sampled at the asphalt plant for laboratory testings. The field applicability was assessed in environmental aspects, such as CO2 emission, and in aspects of constructibility using the existing equipment and procedure, i.e., thickness and density measurement. The laboratory testings included the moisture susceptibility test by AASHTO T283, dynamic modulus test, triaxial repeated load permanent deformation test, and the fatigue test. RESULTS : The temperatures for production and compaction of WMA were 20~30℃ lower than those for HMA and therefore, the noxious gas emission were significantly reduced. The field density of WMA pavements was similar or better than that of HMA pavement. From the laboratory testings, it was found that WMA mixtures exhibit comparable performance to HMA mixture in moisture susceptibility, permanent deformation, and fatigue performance. CONCLUSIONS : With these results, it would be concluded that WMA could replace the existing HMA technology without any significant issue. To support this conclusion, it is necessary to track the long-term performance of WMA in pilot road.

본 연구는 최근 조사료의 신속한 품질평가 방법으로 근적외선 분광법의 이용성이 확대되고 있는 시점에 근적외선 분광기의 현장 적용성을 평가하기 위하여 수행되었다. 실험실용 근적외선분광기와 소형 근적외선분광기의 조사료 품질평가의 예측 정확성을 평가하기 위하여 전남지역에서 이탈리안 라이그라스 사일리지 67점을 수집하여 각각의 근적외선 분광기를 이용하여 스펙트럼을 측정한 후 사료가치의 실험실 분석값과 다변량회귀분석을 통하여 검량식을 유도하여 예측 정확성을 평가하

본 연구에서는 도심지 열섬현상을 완화 시킬 수 있는 아크릴 수지와 차열안료를 혼합한 차열성 포장을 개발하였다. 태양 복사열에 의한 포장체의 온도상승을 모사한 실내 시험으로부터 60℃의 포장 온도에서 차열성 포장이 12℃ 이상의 온도 저감 효과를 나타냈다. 이러한 온도 감소 효과는 차열안료의 배합비가 증가함에 따라 증가하였고, 반면에 점도의 증가로 인하여 작업성은 떨어졌다. 이러한 결과로부터 아크릴 수지 대비 차열안료의 최적혼합비율을 15%로 결정하였다. 차열성 포장의 칸타브로 손실률은 일반 배수성 포장의 손실률 1/4 수준으로 골재 비산 저항성이 우수하게 나타났다. 휠트랙킹 시험결과 차열성 포장의 동적안정도가 일반 배수성 포장에 비해 두 배 증가하였다. 차열성 포장재의 높은 부착력으로 인하여 탈리에 의한 손상 가능성은 낮은 것으로 나타났다. 시험 시공 구간에서의 소음도 측정 시험 결과 일반 배수성 포장에 비하여 평균 3.7dB의 소음저감 효과가 있었고, 미끄럼 저항치는 일반 배수성 포장에 비해서 평균 30% 정도 높아 우수한 미끄럼 저항성을 가지는 것으로 판단된다. 투수 시험 결과 차열성 포장의 투수성은 일반 배수성 포장보다 다소 작았으나 국내 배수성 포장 기준을 만족하는 것으로 나타났다.

본 시험은 사일리지용 옥수수의 논 재배에서 적응성 및 생산성이 우수한 품종을 선발할 목적으로 2008년부터 2009년까지 2년간에 걸쳐 충청남도 천안의 농가포장에서 수행하였다. 국내육성 5 품종과 도입품종 5 품종 등 10 품종을 시험한 결과 국내 품종으로는 강다옥과 광평옥 품종이 건물수량이 각각 ha당 20,295 kg와 19,745 kg으로 수량이 많고 후기녹체성이 좋으며 내습성에 강한 특성을 보였으나 강다옥은 착수고가 공시품종 중에서 가장 높아 도

The sex pheromone of Synanthedon bicingulata (Staudinger), a major pest of peach trees in many regions of northeast Asia, was identified. Two major components from the pheromone gland extracts of female moths are E3,Z13-18:OAc and Z3,Z13-18:OAc, and the average ratio of these components is about 4:6, respectively. In addition to the major components, four minor components, Z13-18:OAc, E2,Z13-18:OAc, E3,Z13-18:OH, and Z3,Z13-18:OH also were identified from pheromone gland extracts. Field tests showed that E3,Z13-18:OAc and Z3,Z13-18:OAc are essential for attraction of male S. bicingulata moths, and males are optimally attracted to the blend ratio found in pheromone gland extracts of conspecific females. Addition of the minor glandular components (Z13-18:OAc, E2,Z13-18:OAc, E3,Z13-18:OH, and Z3,Z13-18:OH) did not affect captures of males to the primary binary blend. Thus, the blend of E3,Z13-18:OAc and Z3,Z13-18:OAc at the natural ratio can be used for monitoring populations of this species.

VES-LMC(Very-Early Strength Latex Modified Concrete)는 콘크리트의 내구성 향상에 기여하는 SB라텍스를 첨가한 신속개방형 보수보강재로서로 교면재포장 및 콘크리트포장 보수에 적용되고 있다. 그러나 VES-LMC의 밝은 색상은 운전자에게 시각적 부담을 유발하여 주행성을 저하시킬 수 있어, 심리적 안정 도모를 위해 VES-LMC의 색상을 인접한 아스팔트 포장구간과 유사한 흑색으로 개발할 필요성이 대두 되었다. 따라서 본 연구에서는 흑색안료인 카본블랙을 시멘트량 대비 2% 첨가한 흑색 VES-LMC에 대한 현장 적용성 및 공용성을 평가하고자 하였다. 현장 적용결과 흑색 VES-LMC는 기존 VES-LMC와 비교하여 작업성, 슬럼프, 공기량 등에는 변화가 없었으며 양생 4시간에서는 20MPa 이상을 발현하였다. 공용성 평가결과 흑색 VES-LMC는 일반콘크리트와 아스팔트포장 구간에 비하여 온도응력발생량이 가장 적은 것으로 평가되었으며, 이것은 콘크리트의 안정성을 의미한다. 특히 결빙시 영하권에서도 상온을 유지하여 도로결빙을 예방하고 융빙을 촉진할 수 있을 것으로 기대된다.

본 연구는 지불계수를 이용하여 시험포장 구간의 품질을 평가하고 이에 따른 피로수명의 변화를 분석하기 위해 실시되었다. 특히 품질관리가 어려운 아스팔트 함량을 지불규정 기준인자로 선정하여 지불계수를 산출하였다. 먼저 아스팔트 함량이 피로수명에 미치는 영향을 확인하기 위하여 아스팔트 함량에 따른 피로수명의 연관성을 분석하였다. 이후 총 2회에 걸쳐 시험포장 구간에서 시료를 채취해서 지불계수를 산출하여 시험포장 구간의 품질을 평가하였으며, 지불계수에 따라 시험포장 구간의 품질에 차이가 있음을 확인 할 수 있었다. 시험포장 구간에 포설된 아스팔트 혼합물을 이용하여 시편을 제작, 피로수명을 분석하였다. 그 결과 지불계수가 높은 시험포장의 피로수명이 월등히 높음을 확인할 수 있었다. 이는 통계이론을 이용한 지불계수가 실제 포장의 피로수명을 반영한다는 것을 의미한다고 사료된다. 또한 시험포장 구간에 아스팔트 혼합물을 납품한 플랜트의 배합보고서와 동일한 시편을 제작하여 휨 피로시험을 실시하여 1, 2회차 시험포장의 피로수명들과 비교하였다. 그 결과 배합보고서를 기초로 제작한 시편의 피로수명이 시험포장 구간의 피로수명에 비해 월등히 높음을 알 수 있었다. 이는 입도나 기타 요인에 따른 공용성 감소현상이 발생 할 수 있음을 나타내는 것이라 사료된다. 따라서 지불규정을 적용중인 미국과 같이 입도, 공극률 등을 지불규정 기준인자로 선정하여 최종적인 지불계수를 산출하는 것이 보다 정확한 도로포장의 품질을 평가할 수 있을 것이다.

(E,E)-8,10-dodecadienyl acetate (E8E10-12:Ac) and (E)-8-dodecaenyl acetate (E8-12:Ac) have been selected as the candidate chemicals for sex pheromone components of the M. phaseoli, female through GC-EAD tests, whereas the two compounds and an additional candidate, (E,Z)-7,9-dodecadienyl acetate (E7Z9-12:Ac), have been found at a ratio of 7:1:1 in the abdominal tip extract (Yum et al., 2008). In order to determine the actual composition of sex pheromone, therefore, several blends using the three chemicals were evaluated for attractiveness to males of M. phaseoli around red bean and soybean fields. Individual components as well as two blends consisted of E8E10-12:Ac/E7Z9-12:Ac and E8-12:Ac/E7Z9-12:Ac did not show attractiveness, whereas the blend of E8E10-12:Ac/E8-12:Ac showed an increased effect in male capture. Of the tested blends with all three chemicals, the 7:1:2 composition of E8E10-12:Ac, E8-12:Ac and E7Z9-12:Ac attracted the most number of males. The results suggested that E7Z9-12:Ac is one of the sex pheromone components and may act as a synergist.

본 시험은 남부지방에 벼 대체 여름 사료작물인 옥수수를 파종하여 조사료를 생산하는데 논 재배에서 적응성 및 생산성이 우수한 품종을 선발할 목적으로 2007년부터 2008년까지 2년간에 걸쳐 전라남도 농업기술원에서 수행하였다. 국내육성 2품종과 도입품종 4품종 등 6품종 을 시험한 결과 광평옥 품종이 간장이 198cm 로 다른 품종들보다 크고 경직경이 굵으며 내습성 및 후기 녹체성이 좋고 우수한 특성을 보였으며 수량 측면에서도 생초수량은 ha당 생초 수량