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BERKURANGNYA UMUR PERKERASAN LENTUR AKIBAT PENCEMARAN LAPIS PONDASI BAWAH OLEH BUTIR-HALUS TANAH-DASAR Martinus Agus Sugiyanto NPM : 2001832002 ABSTRAK Kerusakan perkerasan jalan di Indonesia mengakibatkan berkurangnya umur perkerasan. Masalah itu belum bisa diatasi secara tepat. Tinjauan pada kerusakan perkerasan lentur menunjukkan bahwa hampir tidak ada yang mampu bertahan pada
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  BERKURANGNYA UMUR PERKERASAN LENTUR AKIBAT PENCEMARAN LAPIS PONDASI BAWAH OLEH BUTIR-HALUS TANAH-DASAR Martinus Agus Sugiyanto NPM : 2001832002 ABSTRAK Kerusakan perkerasan jalan di Indonesia mengakibatkan berkurangnya umur  perkerasan. Masalah itu belum bisa diatasi secara tepat. Tinjauan pada kerusakan  perkerasan lentur menunjukkan bahwa hampir tidak ada yang mampu bertahan pada kinerja yang diharapkan hingga umur rencananya. Permasalahan yang bersifat teknis tersebut menimbulkan masalah ekonomi dan sosial masyarakat penggunanya. Berbagai penyebab kerusakan sering diwacanakan seperti tanah dasar atau konstruksi  bagian bawah yang tidak kuat, kesalahan perancangan, penyimpangan dalam  pelaksanaan, jenis dan kualitas bahan, beban berlebih dan lain-lain. Inti dari hipotesa  penelitian ini adalah degradasi kekuatan lapis pondasi bawah akibat pencemaran oleh  butir halus tanah dasar, menyebabkan berkurangnya umur perkerasan. Penelitian ini ditujukan untuk memberikan sumbangsih pemikiran bagi upaya  bersama pihak-pihak yang mempunyai kompetensi mengatasi masalah kerusakan  jalan. Berdasarkan tinjauan pustaka, observasi lapangan dan pelaksanaan uji lubang ( test pit  ), dapat ditarik kesimpulan awal yang memperkuat hipotesa, bahwa telah terjadi pencemaran lapis pondasi bawah oleh butir halus tanah dasar. Hasil pengujian eksperimental di laboratorium (uji CBR  dan  Modulus Resilient  ) menunjukkan bahwa akibat adanya pencemaran tersebut telah mengakibatkan degradasi kekuatan lapis  pondasi bawah. Penggunaan rumus N f (penentuan  ESAL  berdasar kriteria  fatigue ) dan N d (penentuan  ESAL  berdasar kriteria deformasi) diperlukan untuk menentukan umur  perkerasan N (dalam  ESAL ). Program komputer ELSYM5 dipergunakan untuk mendapatkan ε t (regangan tarik pada bagian bawah lapis beraspal) dan ε c (regangan tekan vertikal pada permukaan tanah dasar). Analisa tersebut berdasarkan nilai  Modulus Resilient   lapis pondasi bawah hasil eksperimen dan nilai  Modulus Resilient   tanah dasar hasil konversi dari pengujian  DCP  ( CBR ) di lapangan. Hasil perhitungan umur perkerasan pada kondisi tanah dasar tidak terjadi perubahan nilai  Modulus  Resilient   (  M   R =7,500 psi) untuk gradasi C35 menunjukkan penurunan umur  perkerasan dari 10,827,111.11  ESAL  turun menjadi 5,806,537.36  ESAL  (sisa umur = 53.63%), dan untuk gradasi C60 dari 14,563,466.63  ESAL  turun menjadi 6,395,154.90  ESAL  (sisa umur = 43.91%). Hasil perhitungan umur perkerasan pada kondisi lapisan tanah dasar dengan nilai  Modulus Resilient 2,250 psi, untuk gradasi C35 menunjukkan penurunan umur perkerasan dari 10,827,111.11  ESAL  turun menjadi 3,203,389.42  ESAL  (sisa umur = 29.59%). dan untuk gradasi C60 dari 14,563,466.63  ESAL  turun menjadi 2,269,818.39  ESAL  (sisa umur = 15.59%). Kata kunci: Lapis-pondasi-bawah, tanah-dasar, kadar-tanah-butir-halus,  Modulus- Resilient  , umur- perkerasan-lentur.  THE REDUCED LIFE-SPAN OF FLEXIBLE PAVEMENT AS A RESULT OF CONTAMINATION OF THE SUB-BASE LAYER BY FINE-GRAINED SOIL OF THE SUB-GRADE LAYER Martinus Agus Sugiyanto SRN : 2001832002 ABSTRACT The damage of road pavement in Indonesia to result in the reduced of  pavement life-span. The problem has not been solved in appropriate way. Observation of damaged flexible pavement indicates that there are hardly any roads with flexible pavement that are sufficiently durable to hold out at the performance expected until the end of the life-span. Some causes of damage are often mentioned such as weak sub-grade layers or the bottom construction is weak, faulty planning, deviation in implementation, inappropriate choice of the kind of material, overload and other. The main focus of this research hypothesis is degradation in strength of the sub-base layer as a result of contamination by fine-grained soils of sub-grade layer to result in the reduced of pavement life-span. The research objective is to make an contribution to the collective effort to handle the problem of damaged road pavement, along with the various parties involved that are deemed competent to do so. Based on theoretical review, field observation, making use of test pits may have initial conclusion that supports the hypothesis it can be established that sub-base layer contamination by fine-grained of the sub-grade layer has indeed occurred. The result of experimental testing in laboratory (CBR and Modulus Resilient testing) indicates that the contaminating to result in strength degradation of sub-base layer. Application of the N f   equation (determining ESAL based on fatigue criteria) and N d   equation (determining ESAL based on deformation criteria) is required to determine the pavement life-span N (in ESAL). The ELSYM5 computer program has  been used to establish ε t  (tension strain on the basic surface layer) and ε c  (vertical compression strain on surface of the sub-grade layer). The analysis based on the Resilient Modulus values of the sub-base as the out come of the experimental test and the Resilient Modulus of the sub-grade as the out come of the DCP (CBR) field test conversion. The result of calculating the pavement life-span of the condition the sub-grade layer at an MR value of 7.500 psi for gradation of C35 shows a decrease in life-span from 10,827,111.11 ESAL down to 5,806,537.36 ESAL (The residual life-span = 53.63%), and for gradation of C60 from 14,563,466.63 ESAL down to 6,395,154.90 ESAL (The residual life-span = 43.91%.). The result of calculating the  pavement life-span of the condition the sub-grade layer with an Modulus Resilient value of 2,250 psi, for gradation of C35 shows a decrease in life-span from 10,827,111.11 ESAL down to 3,203,389.42 (The residual life-span = 29.59%) and for gradation of C60 from 14,563,466.63 down to 2,269,818.39 ESAL (The residual life-span = 15.59%.). Key phrases: Sub-base layer, sub-grade layer, fine-grained soil content/level, Resilient Modulus, life-span of flexible pavement.
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