Pengaruh rendaman air laut terhadap daya tahan lapis perkerasan HRS-WC

ASRARUDDIN, Dr.Ir. Latif Budi Suparma, M.Sc

2005 | Tesis | Magister Sistem dan Teknik Transportasi

Pengembangan jaringan jalan di daerah pesisir pantai semestinya tidak hanya memperhatikan faktor kekuatan perkerasan dalam menahan beban lalulintas, tetapi juga harus awet dalam arti memiliki ketahanan tinggi terhadap pengaruh lingkungan antara lain pengaruh rendaman air laut. Penelitian ini dilaksanakan untuk mengetahui pengaruh rendaman air laut terhadap daya tahan maupun tingkat keawetan benda uji campuran HRS-WC. Penelitian ini dilakukan dengan membuat 3 (tiga) jenis variasi agregat pada campuran HRS-WC yaitu benda uji variasi I dengan kandungan agregat kasar 47%, agregat halus 44%, filler 9%, variasi II dengan agregat kasar 40%, agregat halus 51%, filler 9%, dan variasi III dengan agregat kasar 33,5%, agregat halus 57,5% dan filler 9%. Dengan metode Marshall dan Compacted Agregate Density (CAD), ditentukan kadar aspal optimum pada masing-masing variasi benda uji. Benda uji pada kadar aspal optimum selanjutnya direndam dengan air laut selama ½ jam dan 2 jam selama 14 hari. Setelah perendaman, dilaksanakan pengujian Marshall, pengujian Cantabro dan pengujian Marshall pasca Cantabro untuk mengetahui nilai stabilitas sisa dan indeks kekuatan sisa (IKS) serta daya tahan benda uji akibat pengaruh gaya impact. Hasil penelitian menunjukkan kadar aspal optimum benda uji variasi I, II, dan III bertutut-turut adalah 6,6%, 7,4% dan 8,3%. Pada perendaman selama 1/2 jam, benda uji variasi I, II dan III masing-masing memiliki nilai IKS sebesar 97,29%, 97,49%, dan 97,80%, pada perendaman 2 jam nilai IKS masing-masing adalah 94,82%, 95,58% dan 95,90%. Hasil pengujian Cantabro menunjukkan prosentase kehilangan berat paling banyak terjadi pada perendaman selama 2 jam, di mana benda uji variasi I, II dan III masing-masing mengalami kehilangan berat sebesar 3,18%, 2,69%, dan 2,52%. Pada pengujian stabilitas pasca Cantabro, benda uji variasi I, II dan III memiliki nilai Retained Marshall Stability (RMS) masing-masing sebesar 50,16%, 52,92% dan 54,18%. Hal ini menunjukkan bahwa semakin tinggi kadar aspal, semakin tinggi pula tingkat durabilitas benda uji terhadap pengaruh rendaman air laut

The development of road infrastructure in coastal area should not only consider the pavement strength to support the traffic load, but also must durable with high resistance to the effects of sorrounding environment such as the effect of sea water submerged. This research was performed to explore the effect of sea water submerged to the stability and durability of HRS-WC mix specimens. This research was conducted by making 3 (three) kind of agregate variation of HRS-WC mix, they are variation I with 47% of coarse agregate content, 44% of fine agregate, 9% of filler, variation II with 44% of coarse agregate, 51% of fine agregate, 9 % of filler, variation III with 33,5% of coarse agregate, 57,5% of fine agregate, and 9% of filler. By using marshall and compacted agregate density (CAD), have defined the asphalt optimum content in each of specimens variation. Then, the specimens of optimum asphalt content were submerged in sea water as long as a half and 2 hours during 14 days. After the immersion, then marshall test, cantabro test and marshall test after cantabro were conducted to identifie the retained stability indeks and the resistance of specimens to the impact power. The research result shows that the optimum asphalt content of the specimens of variation I, II, and IIII are respectively 6,6%, 7,4%, and 8,3%. In a half hours immersion, the variation I, II, and III of the specimens have respectively retained stability indeks of 97,29%, 97,49%, and 97,80%, meanwhile in 2 hours immersion, the specimens respectively have retained stability indeks of 94,82%, 95,85%, and 95,90%. Cantabro test result explained that the most heavy loss persentage was happened in 2 hours immersion, where the specimens of variation I, II, and III are respectively loss their heavy of 3,18%, 2,69%, and 2,52%. At stability test after cantabro, the specimens of variation I, II, and III are respectively had retained marshall stability of 50,16%, 52,92%, and 54,18%. These data shows that the more of asphalt content, the higher of specimen durability degree to the effect of sea water immersion

Kata Kunci : Jaringan Jalan,Pesisir Pantai,Beton Aspal,HRS,WC,Marshall