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The latest trend of concrete technology declared that concrete is not only needs strength but also durability. it is concurrently with the environmental issues that material durability is something that needs to be prioritized in its use. Various attemps have  been made to produce concrete that has high durability. Many studies and experiments have been done partly by using admixtures of fly ash and silica fume (FS). The latest development was the application of nano silica (NS) to improve the performance of concrete especially its durability. in this study, further experiments were done by using admixtures of nano silica with and without silica fume. the additive were applied to the concrete mix design of high performance concrete (HPC) with f'c 100 MPa as a reference, then mixed with NS in a percentage of 3%, 5%, 110%, 15% with and without silica fume. Further compressive strength  and durability testing were done with a standard DIN 1045 and RCPT standard ASTM C 1202. The experiment results shown that the optimum admixtures proportion were the application of NS 5% and SF 5% which given the best of concrete compressive strength and durability. Furthermore the combination of the use of nano silica with silica fume is more effective than nano silica without silica fume.

Keywords: durability, silica fume, nano silica

Nanotechnology has experienced rapid growth, it can be seen the emergence of products and high interest researchers associated with nanotechnology.The implication process natural resources management is no longer limited to generating value addition, but were able to perform value creation. One potential source is the natural silica sand.

Silica sand reserves in Indonesia, among others are, South Kalimantan, West Java, East Java and Papua. Utilization of silica sand has been used as a filler only on the construction materials at a price of 20 - 50 IDR/kg, while microsilica: 12,000 – 15,000 IDR/kg and nanosilica: 100,000-150,000 IDR/kg.This study develops the potential of silica sand in Indonesia through testing, XRF, XRD, SEM andPSA. Then further process by nanosilica’s equipment in Indonesia, resulting microsilica and nano silica Indonesia. The end result made comparisons with microsilica and commercial nanosilica.

The results showed that the Planetary Ball Mill (PBM), High Energy Milling (HEM) can be used to generate microsilica. Polishing Liquid Milling Technology (PLMT) can be used to make nanosilica of Indonesia's natural resources, which is equivalent to nanosilica have traded commercial.

Keywords: Nanotechnology, Creating Value, Microsilica, Nanosilica.

Fasilitas penyeberangan jalan di depan kampus Universitas Pancasila menghubungkan  halte bus Universitas Pancasila dengan Stasiun Universitas Pancasila Fasilitas tersebut  dipergunakan penumpang KRL yang hendak menuju kampus Universitas Pancasila ataupun menuju lokasi yang berdekatan dengan Universitas Pancasila. Dengan adanya fasilitas penyeberangan maka para penumpang KRL dapat menyeberang jalan dengan aman dan nyaman, tetapi para penumpang juga harus paham tentang aturan dalam menyeberang. Masalah yang muncul diwilayah pengamatan bahwa pengguna jalan dan penyeberang jalan merasa cemas untuk melintas. Baik melintas sebagai penyeberang jalan maupun melintas sebagai pengendara.Dengan menggunakan metode pengamatan lapangan didapat keresahan dari pihak penyeberang jalan. Di lapangan juga terlihat utilitas penyeberang jalan yang telah disediakan. Berdasarkan Undang-Undang Nomer 22 Tahun 2009 tentang Lalulintas dan Angkutan Jalan, bahwa pasal 25 dan  pasal 26 mengatur penggunaan dan perlengkapan jalan. Berdasarkan pengamatan dan analisa, dihasilkan bahwa penyeberang jalan mengharapkan adanya peningkatan fasilitas penyeberang jalan, agar kecelakaan yang sering terjadi dapat berkurang.

Kata kunci: Aksesibilitas, utilitas penyeberangan jalan, fasilitas penyeberangan

The development of construction technology today, allowing construction of high-rise building that has 20 floors or more simply the floor 5-7 cycles/day, so the time of completion of construction of the building quickly. The implication aspects of cost control, quality, time should be more strict and quick in desicion making. one of the critical factors of success achieved work-storey building is the decision of determining materials to be used. To basement whether using normal concrete (without admixture) or integral concrete waterproofing. Therefore it is necessary to use parameters or standards. Permeability, absorption and compressive strength  of concrete. Standard generally used for permeability, absorption and compressive strength  of concrete at the time 28 days. Determination of the age of 28 days is often a problem that resultd in delays in the on going work. one of the parametrs that is needed is the conversion value that can be used on the job basement, thus making receipt of material at an early age concrete. this study is very significant to generate the conversion value of permeability,absorption and compressive strength  of normal concrete for concrete compressive strength: f'c 30 MPa, 35 MPa f'c 40 MPa, 45 MPa f'c and f'c 50 MPa, so it can be used as a standard in determining the material used.

keywords: permeability, absorption,  compressive strength  and conversion value