The pavement of the nailed-slab system has been proposed as an alternative solution for addressing the rigid pavement problem in soft soils. This system is used for developing a rigid pavement. The simple method of using an equivalent modulus of subgrade reaction (k') in nailed-slab system analysis was proposed by a previous researcher. This modulus consists of the modulus of subgrade reaction from a plate load test (k) and an additional modulus of subgrade reaction due to pile installing (k). The additional modulus of subgrade reaction has been proposed by some authors. The displacement factor was used in determining the additional modulus of subgrade reaction. This factor is difficult to define. In this research, the prototype test of a nailed slab with single-pile installation was conducted to learn the validation of the theory of the additional modulus of subgrade reaction on a full-scale dimension. The prototype was constructed on soft clay, and the connection between the pile and slab was perfect monolithically. This system was loaded by centric load. A new curve of the displacement factor is proposed. Calculated deflections based on this curve were compared to the observed deflection and resulted in good agreement with the observation. Hence, it can be used in preliminary design.
Peradaban adalah suatu susunan masyarakat yang kompleks yang dicirikan oleh pembangunan perkotaan, stratifikasi sosial yang diterapkan oleh elit budaya, sistem komunikasi simbolik (misalnya, sistem penulisan), dan pemisahan yang dirasakan dari dan dominasi atas lingkungan alam. Peradaban Islam adalah peradaban yang dibangun di atas dasar aqidah Islam, bertujuan sesuai maksud-maksud (maqashid) syariah, dan diwujudkan dengan mencontoh perbuatan (sunnah) Nabi Muhammad, para shahabatnya serta rambu-rambu halal dan haram. Islam berada di puncak peradaban saat sistem Khilafah masih tegak, meski mengalami pasang surut. Pada tulisan ini dibahas kondisi dunia sains dan teknologi terkini di Indonesia dan dunia, komparasinya dengan sistem Islam saat berada di puncak peradaban, dan tawaran solutif pengembangan sains dan teknologi saat ini.
ABSTRACT:The weaker part of rigid pavement when it is loaded is the edge of slab. Vehicle wheels that are often running in/out from/to pavement can cause void in the sub base-pavement interface for a long time loading period. Flexural moment caused by temperatures also precipitate the damages of pavement edge. To avoid the damage of pavement edge, the vertical wall barrier is added. This research is aimed to learn the contribution of vertical wall barrier on the pavement of Nailed-slab System to reduce the slab deflection. Full scale observation was done over models in soft clay soil. The full scale of 1 pile row Nailed-slab System was conducted on soft clay which consisted of 6.00 m x 1.20 m slab area with 0.15 m in slab thickness, 5 short micro piles as slab stiffeners which were installed under the slab. Piles and slab were connected monolithically, then in due with vertical concrete wall barrier on the two ends of slab. The system was loaded by compression loadings on the slab. Deflection of model without vertical wall barrier was analyzed by finite element method. Results show that the vertical wall barrier cannot significantly reduce the deflection for edge loading. It is opposite to the model test result from Puri, et.al. (2011) where the vertical wall barrier can reduce 74% deflection for edge loadings. It is to be expected that numerical application program could not model the vertical wall barrier which lower position than slab level.
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