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Journal : Jurnal IPTEK

Soil Improvement Planning Combination of Preloading and Stone Column (Case Study) in Sidorukun District, Gresik, Jawa Timur Dewi Kusumaningrum; Gati Sri Utami; Johan Catur Atmaja
Jurnal IPTEK Vol 25, No 2 (2021)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2021.v25i2.2128


The subgrade is the essential part of the construction process, such as access to factories, to develop industrial factory in areas to be developed, one of which in the Gresik area. Not all construction site has met the requirement. Hence, need soil improvement with a combination of preload and stone column. The soil parameters show the results of field and laboratory tests that the area has a small value NSPT with a thickness of the soft bottom layer up to a depth of 20 meters. This research is planned the initial height (Hinitial) to have stability analysis of un-reinforcement embankment, the diameter, and the distance from the stone column with the Xstab program. The results of the calculations carried out for the construction height of the embankment (Hfinal) 3.50 meters, then the first dam (HInitial) of 4.60 m is required. The tilt stabilization is obtained (MR = 168.7 tonm), wherein The Radius of the Slope area is 11.62 meters and the Safety Factor (SF = 0.881), where there is a possibility to slide. Planning preload with a stone column with a diameter of 1.00 meters needs to be combined, a distance of 1.50 meters installed in the subgrade.
The Effect of Using Styrofoam As Additional Material For Asphalt Concrete Layer (Laston) – WC With BNA BLE Arintha Indah Dwi Syafiarti; Fadlil Jalil Aslim; Gati Sri Utami; Ratih Sekartadji
Jurnal IPTEK Vol 26, No 1 (2022)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2022.v26i1.2433


Asphalt concrete layer (laston) has a high degree of flexibility so that placing it directly on top of layers such as AC-WC (Asphalt Concrete – Wearing Course) makes this layer vulnerable to damage due to high temperatures and heavy traffic loads. The type of damage that often occurs in the laston is the release of granules and cracks. Styrofoam is a type of plastic polymer that is thermoplastic when heated it becomes soft and hardens when cold. When mixed with gasoline, styrofoam will soften and can function as an adhesive. This study was to determine the value of Marshall characteristics in the addition of styrofoam into the asphalt.variations used for styrofoam content are 1%, 1.5%, 2% with asphalt content of 4.5%, 5.0%, 5.5%, 6.0%. The results showed that the optimum asphalt value was obtained at 6% asphalt content. And the mixture that meets the requirements is the addition of 1% styrofoam. Higher content of styrofoam will reduce the value of the melt (flow) and will reduce the value of Marshall stability.