Problematic soils such as expansive soils are common in Indonesia. There are several methods to overcome the damage caused by expansive soil, such as by mixing the soil with additives. Some researchers have conducted research by mixing additives into expansive soil (cement, lime, fly ash etc), which work to increase soil strength and reduce swelling. Considering that the people in Buraen Village of Kabupaten Kupang use white soil as a substitute for cement, where the white soil has chemical constituents almost the same as those owned by cement, and contain CaO as it has lime, it is necessary to do research to determine the effect of white soil on physical and mechanical properties of expansive soil, so it can be used as an additive. This research was conducted at Soil Mechanics Laboratory, Civil Engineering Department, Engineering Faculty, Diponegoro University, Semarang.with soil sample from Godong, Central Java and white soil in Buraen Village of Kupang Regency, which purpose to find out the change of physical and mechanical properties of expansive soil that have been given some variation of mixture of white soil  to the dry weight of the soil, with optimum moisture content from standard Proctor test results. The results of this study indicate that white soil can be used as an additive and the use of OMC for mixing is the OMC of expansive soil.

The parts of Yogyakarta-Bawen Toll Road Indonesia, based on the geological agency’s liquefaction susceptibility map are located on moderately susceptible to liquefaction soil. This map can be a preliminary indication of liquefaction as it can roughly indicate liquefaction potential. However, it cannot illustrate the actual condition in detail as its inputs are macro parameters (geological and seismicity factors). The existence of silty sand and sand, earthquake sources, and shallow groundwater increase the liquefaction possibility to occur in this important national project. Therefore, the Liquefaction Severity Index (LSI) and the Liquefaction Potential Index (LPI) using Sonmez’s and Iwasaki’s analysis methods are conducted with peak ground acceleration (PGA) of 0.322 g for the first section and in the second section 0.298 g. The results of the three types of analysis have relatively similar trends but the differences are in each category. The LSI’s categories are very low-moderate in the observed location, meanwhile, the LPI’s categories are low-very high.

Jalan merupakan infrastruktur penting bagi pergerakan manusia dan merupakan akses penghubung antar wilayah. Infrastruktur jalan yang baik akan membuat pengguna jalan lebih nyaman dan mudah untuk berpindah dari tempat yang satu ke tempat yang lain. Kondisi jalan yang baik akan membawa dampak yang menguntungkan dari sisi ekonomi bagi kemajuan suatu daerah. Kondisi jalan penghubung antar desa di wilayah Desa Jembrak saat ini masih banyak yang memprihatinkan. Terdapat ruas jalan yang saat ini masih berupa jalan tanah berbatu dimana menjadi akses yang harus dilalui oleh masyarakat Desa Jembrak menuju desa tetangga. Kondisi tersebut semakin parah saat memasuki musim penghujan, dimana jalan tanah akan menjadi becek bahkan licin saat dilalui. Hal inilah yang menjadi alasan dilakukannya Pengabdian Masyarakat di Desa Jembrak. Kegiatan pengabdian kepada masyarakat ini dilakukan oleh Tim Pengabdian Masyarakat Departemen Teknik Sipil Universitas Diponegoro kepada masyarakat Desa Jembrak untuk bersama-sama dan bergotong-royong membuat jalan penghubung desa dengan material beton. Struktur beton dipilih untuk pembuatan jalan desa karena sumber material utama yaitu pasir dan split mudah didapatkan di Desa Jembrak. Potensi tenaga dan semangat gotong royong penduduk desa juga masih sangat tinggi. Pengabdian kepada Masyarakat di Desa Jembrak ini berupa pendampingan pembuatan jalan yang terdiri dari metode pencampuran beton, tahapan pelaksanaan, hingga perawatan beton secara benar dengan masyarakat sebagai tenaga pelaksana pekerjaan pembuatan jalan. Sehingga, dengan adanya kerjasama yang baik antara Tim Pengabdian Masyarakat Departemen Teknik Sipil Universitas Diponegoro dan warga Desa Jembrak, jalan penghubung desa dari rabat beton yang layak guna memperlancar mobilitas masyarakat Desa Jembrak dapat terwujud.Kata kunci : jalan beton, mobilitas, pembuatan jalan

An expansive clay soil material that is composed of various minerals include kaolinite

<strong><em>Slab on pile is one of the bridge structures used in the Semarang Demak Toll Road Project Section 2. The slab on pile structure consists of a slab, pile head, and piles. There are 2 (two) typical slab on pile bridges at this location, which are distinguished by the number and distance of the piles. 5 (five) piles in 1 (one) pile head with a spacing of 3.5 meters are used for piles with a freestanding of less than 6 meters. This pile configuration is located at STA 19 +658 to 19+793. Meanwhile, 6 (six) piles with a space of 2.8 m are used for piles with freestanding of more than 6 meters. This pile configuration is located at STA 19+800 to 19+894. At STA 19+674 there is an expansion joint that functions to accommodate all forms of movement that occur in the slab on pile structure. In addition, the span between the piles in the longitudinal direction is 7 meters. This slab on pile planning (SNI 1725:2016) "Loading for Bridges" and "Bridge Planning for Earthquake Loads" (SNI 2833:2016). Slab on pile planning is carried out with the help of SAP2000 software to determine the internal forces that occur in the slab on pile structure. The foundation system used in the modeling is a pile with spring support where the function of the spring support is to represent the nature of the soil. The result of this plan is to obtain a slab on pile structure design along with shop drawings.</em></strong>