The Experts below are selected from a list of 228 Experts worldwide ranked by ideXlab platform
Louay N Mohammad - One of the best experts on this subject based on the ideXlab platform.
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evaluating the light falling weight deflectometer device for in situ measurement of elastic modulus of pavement layers
Transportation Research Record, 2007Co-Authors: Munir D Nazzal, Murad Y Abufarsakh, Khalid A Alshibli, Louay N MohammadAbstract:Field and laboratory Testing programs were conducted to evaluate the potential use of the light falling weight deflectometer (LFWD) device for measuring the in situ elastic modulus of pavement layers and subgrades. The field Tests were conducted on several highway sections selected from different projects in Louisiana. In addition, nine Test sections were constructed and Tested at the Pavement Research Facility site of Louisiana Transportation Research Center. All sections were Tested using the Prima 100 model-LFWD in conjunction with the falling weight deflectometer (FWD), Plate Load Test (PLT), and dynamic cone penetrometer (DCP) Tests that were used as reference measurements. Linear regression analyses were carried out on the collected Test data to develop models that could directly relate the LFWD stiffness modulus with moduli obtained from FWD and PLT and the DCP penetration rate. In addition, multiple nonlinear regression analyses were conducted to develop models that could predict FWD and PLT modul...
Munir D Nazzal - One of the best experts on this subject based on the ideXlab platform.
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evaluating the light falling weight deflectometer device for in situ measurement of elastic modulus of pavement layers
Transportation Research Record, 2007Co-Authors: Munir D Nazzal, Murad Y Abufarsakh, Khalid A Alshibli, Louay N MohammadAbstract:Field and laboratory Testing programs were conducted to evaluate the potential use of the light falling weight deflectometer (LFWD) device for measuring the in situ elastic modulus of pavement layers and subgrades. The field Tests were conducted on several highway sections selected from different projects in Louisiana. In addition, nine Test sections were constructed and Tested at the Pavement Research Facility site of Louisiana Transportation Research Center. All sections were Tested using the Prima 100 model-LFWD in conjunction with the falling weight deflectometer (FWD), Plate Load Test (PLT), and dynamic cone penetrometer (DCP) Tests that were used as reference measurements. Linear regression analyses were carried out on the collected Test data to develop models that could directly relate the LFWD stiffness modulus with moduli obtained from FWD and PLT and the DCP penetration rate. In addition, multiple nonlinear regression analyses were conducted to develop models that could predict FWD and PLT modul...
Raden Harya Dananjaya - One of the best experts on this subject based on the ideXlab platform.
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penggunaan material batu kapur sebagai lapisan subbase course perkerasan jalan pada subgrade tanah granuler
Matriks Teknik Sipil, 2017Co-Authors: Lukman N Fahreza, Bambang Setiawan, Raden Harya DananjayaAbstract:Kerusakan perkerasan jalan tidak hanya disebabkan oleh kualitas permukaan perkerasannya, tetapi juga dapat disebabkan oleh kualitas struktur lapis pondasi atas ( base course ), lapis pondasi bawah ( subbase course ) dan tanah dasar ( subgrade ). Penelitian ditujukan untuk menganalisis pengaruh ketebalan lapisan subbase course pada subgrade tanah granuler terhadap nilai CBR dan k v . Penelitian dilakukan dengan mensimulasikan struktur lapisan perkerasan jalan di dalam laboratorium. Pengujian CBR dilakukan terhadap lapisan subgrade , sedangkan pengujian Plate Load Test dilakukan pada lapisan subbase course dan base course . Hasil penelitian menunjukkan bahwa penambahan ketebalan subbase course setiap 5 cm mampu meningkatkan nilai CBR pada subbase course berturut-urut sebesar 15,93%; 38,73% dan 3,35%. Penambahan ketebalan subbase course setiap 5 cm mampu meningkatkan nilai CBR pada base course berturut-urut sebesar 4,63%; 34,09%; 21,99% dan 2,68%. Penambahan ketebalan subbase course setiap 5 cm mampu meningkatkan nilai k v pada subbase course berturut-urut sebesar 6,79; 58,82 dan 3,03%. Penambahan ketebalan subbase course setiap 5 cm juga mampu meningkatkan nilai k v pada base course berturut-urut sebesar 12,20; 30,85; 9,30 dan 3,61%. Lapisan subbase course terbukti memiliki performa yang lebih baik dibandingkan lapisan base course . Hal ini ditunjukkan dengan nilai CBR subbase course yang 33,33% lebih besar daripada nilai CBR base course , pada ketebalan total struktur perkerasan jalan 40 cm. Hal ini juga ditunjukkan dengan nilai k v subbase course yang 26,83% lebih besar daripada nilai k v base course , pada ketebalan total struktur perkerasan jalan 40 cm.
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material batu kapur sebagai lapisan subbase course pada subgrade tanah lunak dengan perkuatan plastik dan geosintetik
Matriks Teknik Sipil, 2017Co-Authors: Bambang Setiawan, Raden Harya DananjayaAbstract:Kerusakan perkerasan jalan selain karena faktor cuaca dan kelebihan beban juga dapat disebabkan oleh kualitas struktur lapis pondasi atas ( base course ), lapis pondasi bawah ( subbase course ) dan tanah dasar ( subgrade ). Penelitian ditujukan untuk menganalisis pengaruh ketebalan lapisan subbase course pada subgrade tanah lunak terhadap nilai CBR dan k v . Penelitian dilakukan dengan mensimulasikan struktur lapisan perkerasan jalan di dalam laboratorium. Pengujian CBR dilakukan terhadap lapisan subgrade , sedangkan pengujian Plate Load Test dilakukan pada lapisan subbase course dan base course . Hasil penelitian menunjukan bahwa dengan penambahan ketebalan lapisan subbase course setiap 5 cm mampu meningkatkan k v pada kombinasi lapisan lengkap subgrade+ plastik+ subbase course+base course berturut-turut sebesar 65%; 12,35%; 7,67%; dan ditambah perkuatan geosintetik meningkatkan nilai k v pada base course berturut-turut sebesar 26,13%; 14,28%; 24,19%. Hasil penelitian juga menunjukan bahwa dengan penambahan ketebalan lapisan subbase course setiap 5 cm mampu meningkatkan CBR pada kombinasi lapisan lengkap subgrade+ plastik+ subbase course+base course berturut-turut sebesar 145,16%; 33,97%; 87,01%; dan ditambah perkuatan geosintetik meningkatkan nilai k v pada base course berturut-turut sebesar 75,43%; 49,51%; 65,53%. Penambahan geosintetik geotextile woven tipe 250 sebagai perkuatan yang diletakan di antara lapisan subgrade dan subbase course dapat meningkatkan nilai modulus reaksi subgrade ( k v ) sebesar ± 26,35%.
Youngho Park - One of the best experts on this subject based on the ideXlab platform.
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evaluation of size effects of shallow foundation settlement using large scale Plate Load Test
Journal of the Korean Geotechnical Society, 2012Co-Authors: Youngho ParkAbstract:Abstract This paper addresses the size effect of shallow foundation settlement in very dense weathered granite soil commonly encountered in bridge foundation. Load-settlement curves measured from the Plate Load Tests of 5 different Plate sizes in 2 sites were analyzed. The Test results showed that the ground beneath the Plate was considered not to reach the failure state and the settlement continuously increased proportionately as Load increased. The result implies that settlement would govern the stability or serviceability of foundation on very dense weathered soil. The size effect is expressed as a relationship of subgrade reaction modulus to the size of Plate. Compared with the previous relationships, the size effect in this result was more prominent and indicated that settlement prediction using the previous method could possibly underestimate the settlement of foundation in dense weathered granite soil. 요 지 교량기초의 지지층인 조밀한 화강풍화토 지반에서 얕은 기초의 침하에 대한 크기효과를 평가하고자 하였다. 이를 위해 지반조건이 유사한 2개 현장에서 재하판 크기를 다르게 하여 평판재하시험을 수행하였다. 시험결과 재하판 하부 및 주변 지반의 파괴는 관찰되지 않았으며 하중 증가에 따라 침하가 비례하여 증가하였다. 이러한 결과는 대상지반에 지지되는 기초의 안정성 또는 사용성은 침하가 지배하는 것을 의미한다. 침하에 대한 기초크기 효과는 압력-침하곡선의 기울기로 표현되는 지반반력계수와 기초폭의 관계로 표현하였다. 기존에 제안된 관계식과 비교해 볼 때 본 실험 결과는 크기효과가 더 크게 나타나며, 이는 기존에 제안된 관계식은 조밀한 화강풍화토 지반에 지지된 기초의 침하를 과소평가할 수 있음을 나타낸다.
Murad Y Abufarsakh - One of the best experts on this subject based on the ideXlab platform.
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evaluating the light falling weight deflectometer device for in situ measurement of elastic modulus of pavement layers
Transportation Research Record, 2007Co-Authors: Munir D Nazzal, Murad Y Abufarsakh, Khalid A Alshibli, Louay N MohammadAbstract:Field and laboratory Testing programs were conducted to evaluate the potential use of the light falling weight deflectometer (LFWD) device for measuring the in situ elastic modulus of pavement layers and subgrades. The field Tests were conducted on several highway sections selected from different projects in Louisiana. In addition, nine Test sections were constructed and Tested at the Pavement Research Facility site of Louisiana Transportation Research Center. All sections were Tested using the Prima 100 model-LFWD in conjunction with the falling weight deflectometer (FWD), Plate Load Test (PLT), and dynamic cone penetrometer (DCP) Tests that were used as reference measurements. Linear regression analyses were carried out on the collected Test data to develop models that could directly relate the LFWD stiffness modulus with moduli obtained from FWD and PLT and the DCP penetration rate. In addition, multiple nonlinear regression analyses were conducted to develop models that could predict FWD and PLT modul...