Abstract-Infrastructure industry is still dominant in developing countries. These activities requires a large number of aggregates. To make cement concrete and asphalt concrete, itrequires60% to 75% of aggregate in total volume of the mixture. This high volume of aggregates may cause reduction on availability of natural aggregate. Another problem is that not all area in Indonesia has the ability to provide adequate aggregates so that it can support the infrastructure development, especially in remote areas. The aggregate mobilization may face disruption. This research attempts to present an idea of creating an artificial aggregate. The artificial aggregate is made of power plant waste that is mixed with alkali silica, named as fly ash geopolymer. Previous study indicates that the use of fly ash geopolymer as filler replacement in asphalt concrete mixture, is able to double the stability of Marshall test. This experiment serves a role to design an artificial aggregate.

Aviation industry growth has increased continuously over the years. Air transport demand continues to increase due to the reliability, time saving and efficiency. Aviation industry has impact on environment as a source of pollutant emissions. The estimation of pollutant emissions at taxi/idle, approach, climb out and take off of Carbon dioxide (CO2) and Nitrogen dioxide (NOx) at Juanda International Airport Indonesia was calculated using Advanced ICAO landing and take-off (LTO) cycle method. The CO2 emissions were 23.02 tons, 10.52 tons, 17.27 tons and 6.73 tons during taxi/idle, approach, climb out, take off respectively while NOx emissions were 0.03 tons, 0.03 tons, 0.12 tons and 0.06 tons for taxi/idle, approach, climb out and take-off respectively. Based on the results of the discussion it can be concluded that pollutant emissions and fuel consumption are positively related to amount of flight operation. The aircraft emissions affect the air quality around the vicinity of airport and lead to climate change.

Bekasi City is a buffer city of the Capital City of DKI Jakarta, with a population of 2,873,484 inhabitant. KRL, LRT, and BRT were built to meet the needs of trips to the city of Jakarta to reduce congestion. In fact, many people didn’t use KRL, LRT, and BRT as means to go to Jakarta. Therefore it is necessary to anlyze the accessibility to the three stations. The method used in this study is the Accessibility Method with the Competition Measure. Each land use surrounded the Bus Rapid Transit station area, Jabodebek LRT station, and Commuter Train Station is identified. Each facility's capacity, the physical distance between zones, travel time based on mode, and travel costs are the considered variables. The results show that the worst accessibility value is on Thursday, with the worst accessibility value of 5.804 for centroid number 235. The total area with a good accessibility category is 89 km2, moderate is 117 km2, and bad is 89 Km2. From the multiple regression analysis, the modeling form Y = -0.731 + 0.006 X1 + 0.075 X2 + 0.03 X3 + 0.031 X4 is obtained. From the new accessibility results, the value obtained the results of the category of good accessibility from 89 Km2 become 86 km2, areas with moderate accessibility category increased from 117 Km2 to 132 km2, and areas with poor accessibility categories from 33 km2 to 19 km2.Keywords: Accessibility; BRT Station; LRT Station; KRL Station; Public Transportation.ABSTRAKKota Bekasi merupakan kota penyangga Ibukota DKI Jakarta dengan jumlah penduduk 2.873.484 jiwa, serta memiliki potensi pergerakan orang yang besar menuju wilayah DKI Jakarta. KRL, LRT, dan BRT di Kota Bekasi dibangun untuk memenuhi kebutuhan perjalanan menuju Kota Jakarta untuk mengurangi kemacetan. Pada kenyataannya, banyak orang tidak menggunakan sarana tersebut menuju ke Kota Jakarta. Oleh karena itu perlu dilakukan penelitian untuk mengetahui tingkat pelayanan angkutan umum menuju ketiga stasiun tersebut. Salah satu indikator tingkat pelayanan adalah aksesibilitas. Adapun metode yang digunakan didalam penelitian ini adalah pengukuran aksesibilitas dengan metode penghitungan Competition Measure, dimana pada masing masing kawasan stasiun Bus Rapid Transit, stasiun LRT Jabodebek, Stasiun Kereta Commuter akan dilakukan penghitungan kapasitas masing–masing fasilitas, jarak fisik antar zona,  waktu tempuh perjalanan, biaya perjalanan. Penghitungan menghasilkan nilai aksesibilitas terburuk pada hari kamis dengan nilai aksesibilitas terburuk 5.804 pada centroid nomor 235, dengan luas wilayah kategori baik sebesar 89 Km2, sedang sebesar 117 Km2, dan buruk sebesar 89 Km2. Dari analisa regresi berganda didapatkan bentuk pemodelan Y  = -0.731 + 0.006 X1 + 0.075 X2 + 0.03 X3 + 0.031 X4. Dari hasil nilai aksesibilitas baru didapatkan hasil kategori aksesibilitas baik sebesar 89 Km2 menjadi 86 Km2, wilayah dengan kategori aksesibilitas sedang dari 117 Km2 menjadi 132 Km2, dan wilayah dengan kategori aksesibilitas buruk dari 33 Km2 menjadi 19 Km2.Kata Kunci: Aksesibilitas; Stasiun BRT; Stasiun LRT; Stasiun KRL; Pengangkutan Umum.

The purpose of this research is to observe the strength of asphalt concrete using solidified coal waste or geopolymer. The use of geopolymer is known in enhancing concrete mixture strength. More detail in this study is to acquire the comparison rate of stability and flow of mixture using geopolymer and the one with ordinary filler. The stability and melting rate of this mixture will determine whether the use of geopolymer as a filler material in flexible pavement is applicable. In this research, the first stage is to find the initial mix design, which is not including the geopolymer filler. From this research, it is found that the use of geopolymer increases the stability in asphalt mixture but reduce the melting rate and increase the cavity in the mixture. Although the melting rate decreases and the voids increases, the result acquired still fulfills the minimum specification of asphalt concrete for the high level of traffic load.

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