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AGGREGATES FOR HIGHWAY CONSTRUCTION FROM UNWEATHERED AND PARTIALLY WEATHERED SOURCES

Master Theses from / 2005-02-19 00:34:21
Oleh : SELAMAT RASIDI, S2 - Highway System Engineering
Dibuat : 1990-00-00, dengan 1 file

Keyword : The physical and mechanical properties, the bulk of the mix, Angeles Abrasion Value.
Nomor Panggil (DDC) : T 625.7 RAS
Sumber pengambilan dokumen : 1990/2224

The physical and mechanical properties of a wide range of quality of aggregates as prepared from sources found around Bandung, West Java, were examined with a view to assessing their likely performance when used in bituminous pavement surfacings, where the bulk of the mix is comprised of graded aggregates. Materials which were of basic igneous origin, were taken from both bedrock and alluvial sources and represented a wide range of weathering grades. The materials were designated according to a colour coding. The laboratory programme on physical and mechanical properties involved testing for the Aggregate Impact (AIV) and Los Angeles Abrasion Value. In the former test repeated soaking and drying cycles were applied, according to British Standard procedure, prior to loading. This was an attempt to simulate weathering effects, but the limited cycle times applied were found to be insufficient to show any changes due to simulated accelerated weathering, and magnesium sulphate soundness tests would be required to examine this further. A modified impact value (AIVM) was also determined and a residual (AIVR) calculated. It was found that the procedure used in the Institute of Road Engineering was not standard. The second part of the programme involved preparation of bituminous mixes using the aggregates from the different sources. The mixes were gap graded at the no. 16 sieve size. Portland Cement was used as a filler and the bitumen was of 80-100 pen grade as readily found in Indonesia. Testing of the mixes was carried out using Marshall procedures. The results of the materials and Marshall tests indicated that all the qualities of stone could pass adequately normal designated specification standards, except that the flow values in the Marshall tests were usually a little high, in line with the high contents of bitumen required in the mixes. A significant percentage of the bitumen was absorbed in the aggregate, the amount varying from 0.8 % to 2.4 X, in accordance with the degree of weathering of the aggregate.

Deskripsi Alternatif :

Sifat-sifat fisik dan mekanik dari beberapa macam kwalitas agregat yang terdapat pada sumber-sumber di sekitar Bandung, Jawa Barat, diteliti dengan tujuan untuk mengkaji daya gunanya sebagai bahan lapisan permukaan perkerasan aspal dimana campuran agregat terdiri dari beberapa macam gradasi. Material yang berasal dari basic igneous diambil dari sumber bedrock dan alluvial dan mewakili berbagai macam tingkat pelapukan. Material tersebut dinyatakan berdasarkan Rode warna. Program laboratorium dalam menentukan sifat-sifat fisik dan mekanik meliputi pengujian Aggregate Impact Value (AIV), and Los Angeles Abrasion Value. Pada pengujian yang pertama perendaman dan pengeringan secara berulang-clang dilaksanakan menu rut prosedur British Standard sebelum dibebani. Hal ini merupakan usaha untuk menstimulasi terjadinya pelapukan, tetapi terbatasnya siklus waktu perendaman dan pengeringan yang dilakukan ternyata tidak cukup untuk menunjukkan adanya perubahan akibat percepatan simulasi pelapukan tersebut dan pengujian magnesium sulphate soundness diperlukan untuk pengujian selanjutnya. Aggregate Impact Value Modified (AIVM) juga ditentukan dan sisanya (AIVR) dapat dihitung. Ternyata prosedur yang digunakan oleh Puslitbang Jalan tidak standard. Bagian ke dua dari program ini meliputi persiapan campuran aspal yang menggunakan agregat dari sumber-sumber yang berbeda. Campuran tersebut gap graded pada saringan no. 18. Semen digunakan sebagai bahan pengisi dan aspal yang dipergunakan adalah jenis 80-100 pen grade yang banyak terdapat di Indonesia. Pengujian campuran aspal dilaksanakan dengan menggunakan prosedur Marshall. Hasil-hasil pengujian agregat dan pengujian Marshall menunjukkan bahwa semua kwalitas batuan memenuhi standard spesifikasi normal, kecuali nilai flow di dalam pengujian Marshall lebih tinggi dari biasanya, sesual dengan tingginya Radar aspal yang diperlukan dalam campuran itu. Persentase aspal yang diserap oleh agregat cukup berarti, jumlahnya bervariasi dari 0.8 % sampai 2.4 X sesuai dengan tingkat pelapukan agregat tersebut.

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