Abstract. Technology of concrete has been advanced recently to improve the properties of concrete. Utilization of ash as the substitute of cement or filler of concrete also indicates good result in compressive strength concrete in certain amount. Harnessing the bacteria for self-healing concrete has also been successfully performed in order to maintain the destruction of the concrete by itself. Past research indicated that bacteria can be beneficiary to improve the compressive strength, absorption, permeability, and so on. In this paper, Bacillus Altitudinis was extracted from the karst (source from the limestone mountain) and bred through liquid media to be impregnated inside the volcanic ash. The impregnated bacteria in volcanic ash were used as the filler to the concrete mixture with the proportion of filler varied from 1%, 1.5% and 2% to the weight of cement. Mechanical properties of the concrete specimen showed that the compressive strength reached its best when the filler proportion was 1.5%. The absorption referred analogously to the increment of compressive strength due to the success of filling the void inside the concrete. Based on compression test to all the concrete specimens, there was enhancement about 18% and the average absorption can be abated around 23%. Future research due to some drawbacks turning up is the need of developing another media for bacteria to live and making sure the exact amount of bacteria impregnated to the media so that the desired advance of concrete compressive strength can be acquired.
The purpose of this research was to analyze soft second story bulding behavior due to the earthquake load by applying column height variation. The building case has a vertical irregularity soft story on the second level so the behavior during the earthquake was analyzed by heighten the columns at the second level of the building. The behavior of building structure results the response such as internal forces in columns and beams, base shear, fundamental period, displacement and story drift. The seismic analysis is using dynamic analysis response spectrum based on SNI 1726:2012 and carried out using software ETABS version 9.7.4. The results of this research indicates that the increase of column height in soft second story building reduces the building stiffness. So it decreases the building forces, extending the fundamental period, decreasing the base shear, increasing the displacement and the story drift. It can be concluded that the soft second story building reduces the building resistance of earthquake load by produces the behavior approaches the collapse.
Abad ke-21 adalah abad digital. Komunikasi dilakukan melewati batas wilayah negara dengan menggunakan perangkat teknologi yang semakin canggih. Kemajuan teknologi tersebut dirasakan oleh berbagai industri dan manufaktur. Namun dari berbagai bidang yang ada, pendidikan adalah bidang yang paling merasakan dampak positif terhadap kemajuan teknologi dan informasi. Salah satu penerapan pembelajaran abad 21 adalah modul blended learning. Modul berbasis blended learning akan memberikan warna baru yang dapat dengan mudah dilakukan oleh siswa dengan bimbingan guru. Salah satu kelebihan modul blended learning yaitu bahan ajarnya memberikan pengalaman bagi peserta didik dalam belajar mandiri dengan melakukan intruksi-instruksi untuk melakukan tugas dengan bisa mengakses materi-materi secara online. Kegiatan ini bertujuan untuk melatih peserta dalam menyusun modul Blended Learning yang dapat digunakan pada pembelajaran. Peserta merupakan guru-guru SMKN 6 Kota Bekasi dan SMKN 1 Cikarang Barat sejumlah 45 orang. Peningkatan nilai dari pretest (62,22) ke posttest (69,33) menunjukkan pemahaman peserta mengenai penyusunan modul Blended Learning meningkat.
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