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Sentot Hardwiyono
Universitas Muhammadiyah Yogyakarta
Engineering

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Pemanfaatan Batugamping Keprus Sebagai Campuran Agregat Pada Lapis Pondasi Agregat Kelas B Sentot Hardwiyono; Anita Widianti
Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v8i2.905

Abstract

Batugamping keprus banyak terdapat di Kabupaten Gunung Kidul, Yogyakarta. Penelitian ini bertujuan untuk mengkaji kemungkinan pemakaian batugamping keprus sebagai bahan campuran agregat pada  lapis pondasi agregat kelas B. Penelitian dilakukan dengan membuat berbagai variasi persentasi campuran batugamping keprus, sirtu dan tanah. Batugamping keprus bervariasi dari 15% hingga 85%, sirtu bervariasi dari 75% hingga 5% dan tanah tetap sebesar 10% dari berat total campuran. Pada setiap campuran dilakukan uji batas cair, indeks plastisitas, CBR unsoaked dan CBR soaked pada kepadatan maksimal dengan mengacu pada SNI. Hasil penelitian menunjukkan bahwa nilai batas cair, nilai indeks plastisitas dan nilai CBR unsoaked dari berbagai persentasi campuran batugamping keprus, sirtu dan tanah (kecuali untuk campuran 85% batugamping keprus, 5% sirtu dan 10% tanah) memenuhi spesifikasi yang telah ditetapkan oleh Bina Marga,  namun nilai CBR soaked tidak memenuhi spesifikasi tersebut.  
Pengaruh Penambahan Parutan Karet Ban Gradasi Tipe 2 terhadap Parameter Marshall pada Campuran Hot Rolled Sheet Wearing Course Sentot Hardwiyono
Semesta Teknika Vol 15, No 2 (2012): NOVEMBER 2012
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v15i2.1358

Abstract

The provision of road infrastructure cannot be separated with the pavement construction itself. One of the materials used is asphalt that is really related to natural resources. Using asphalt is not durable in many cases because of the oxidation process, mainly due to heating. This can lead the road (flexible pavement) to fast deformation, including cracking. Nowadays, there are many additives to improve the asphalt quality. One of them is adding rubber to the asphalt which can give more durability under high temperatures, increase its adhesion, and improve its flexibility. This study used the additives in the form of shredded rubber with the content of 20%, 21%, and 22% of the total mass of asphalt. The shredded rubber was mixed with the asphalt, and then heated at least 45 minutes before mixing it with the aggregates. The HRS WC mixture with the tire rubber was compared in term of optimum asphalt content and Marshall results. The results show that adding shredded tire rubber in HRS WC mixture can decrease the flow. This shows that the addition of shredded rubber can decrease of the sample deformation, so that the mix will not be too plastic and easily deformed under the loading. It can also increase the VIM and decrease the VFA, so that it can reduce the bleeding possibility.
Co-Authors Anita Widianti