Pasa Lolo, Dina (2022) KAYU BUS (Melaleuca Viridiflora) SEBAGAI MATERIAL PERKUATAN LAPIS PONDASI PADA PERKERASAN LENTUR JALAN. Doctoral thesis, UNDIP.

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Abstract

Abstract
The development of transportation infrastructure, especially roads, is an important
part of national development. In addition to encouraging economic growth, road construction
can also increase productivity, absorb employment, increase global competitiveness, and
help reduce poverty. The provision of road infrastructure can have a significant impact on
the economy. With the development of road infrastructure, it can achieve remote areas that
have good economic potential, to accelerate economic growth in the region. However, the
development of road infrastructure is inseparable from various challenges, such as
geographical conditions and climate change, as well as material limitations. The limited
material for road pavement causes the need for materials from other places, which makes the
material procurement costs expensive. Therefore, it is necessary to make efforts to utilize
local materials as an alternative to substitute materials. The test was carried out on a full
scale, where the specimens are made from timber raft construction which is used as a subbase.
The model of the test consisted of a flexible pavement with and without timber raft with a
length of 14 m and a width of 3.5 m. Road pavement construction consists of subgrade layer,
Bus timber raft, soil cement, and asphalt concrete bearing course (ACBC). Static loading is
used in this test where the load will be varied starting from 8,4 tons and 19,4 tons. A digital
dial gauge was used to measure the settlement that occurs, while the CBR tools is used to
support while loading. Plaxis2D and KENPAVE applications will be presented and
compared to the results of data analysis from the field. The results showed that the settlement
magnitude on pavement without a timber raft are 26,18 mm with a duration 8 minutes at 8,4
tons of loaded and 26,81 mm with a duration of 5 minutes at 19,4 tons of loaded. While for
pavement using a timber raft, the magnitude of the settlement that occurred is 26,71 mm in
12 minutes at 8,4 tons of loaded, and for 19,4 tons of loaded the settlement is 26,39 mm in 9
minutes of duration. Furthermore, the results of the analysis using Plaxis2D showed that the
settlement of 8,4 tons of loaded was average decreased 24,53 mm and 24,21 mm for
pavement with and without timber raft, respectively. And for 19,4 tons of loaded, the
settlement was decreased 25,27 for pavement with no timber raft and 27,15 mm for pavement
with timber raft. The result of the analysis using empirical modulus of elasticity showed the
different of deflection was 16,5 %. A correction factor of 0,83 is required so the different of
deflection becomes 9,9 %. While the results of the analysis with KENPAVE obtained the
number of repetitions of the load that can be resisted by the pavement with timber raft until
it is damaged is 3,7E5 ESAL for fatigue cracking and 2.83E2 ESAL for permanent
deformation.
Keywords: Flexible Pavement, Subbase Course, Bus-Timber Raft Construction

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