Currently concrete technology continues to grow and continue to innovate one of them using fibers. Fiber concrete has advantages over non-fiber concrete, among others: strong against the effect of shrinkage, ability to reduce crack as well as fire resistance. In this study, concrete mix design using the procedures listed on SNI 03-2834-2000. The sample used is a cylinder with a height of 30 cm and a width of 15cm in diameter, which is used for compression and tensile testing, while the slab is 400cm x 100cm x 15cm. The fiber used is steel fiber (dramix), with the addition of 2/3 of the thickness of the slabs. The charging is done using a two-point loading. From the result of the research, it is found that the loading of non-fiber slab (0%) of the initial crack is the maximum crack that has passed the maximum crack allowed with a crack width of 1.3 mm with a loading of 1160 kg. The initial crack with the largest load is found on the 1% fiber mixed slab, with the initial crack also being a maximum crack of 0.5mm which also has exceeded the required maximum crack. In the 4% slab the initial crack of 0.1 mm is a minimal initial crack with a load greater than the load of a non-fiber (0%) slab by load1200 kg. While the maximum load on the maximum crack according to the applicable maximum crack conditions, on the 5% fiber mixed slab with a crack width of 0.32mm by loading 1250 kg.
Jembatan sungai Meskom awalnya merupakan jembatan balok T yang menghubungkan permukiman masyarakat setempat. Kondisijembatan tersebut saat ini memiliki pilar yang terlalu banyak yang berada dibawah balok T sehingga perahu-perahu nelayan tidak bisa melintasdibawah jembatan. Sehingga dicoba mendesain ulang jembatan tersebut menggunakan girder beton prategang. Dengan menggunakan girder prategangdiharapkan, sungai nantinya bisa difungsikan bagi masyarakat setempat dan perahu nelayan bisa melintas dibawah jembatan. Untuk analisa bebanmengacu pada standar pembebanan untuk jembatan SNI 1725-2016, dan SNI T-12-2004 untuk perencanaan struktur jembatan beton prategang.Desain meliputi Girder, diafragma, trotoar, slab. Hasil dari Desain yaitu lebar Slab jembatan 8 m, tebal 0,2 m, momen ultimit pada tumpuan 85,853kN, tulangan lentur negatif dan positif sama, yaitu Tulangan pokok D 16 – 100, tulangan bagi D 13 – 120.. Girder prategang menggunakan PCI girderdengan spesifikasi tinggi 0,9 m, beam spacing 2 m, mutu beton girder k-800. Kabel prestress pada desain PCI girder digunakan 4 tendon yang masing – masing terdiri dari 19 kawat jenis uncoated 7 wire super strands ASTM A-416 grade 270.Gaya prategang awal 5442,998 kN, gaya yang terjadiakibat jacking 4802,645 kN, dan gaya prategang akhir diperkirakan kehilangan tegangan (loss of prestress) 30% yaitu 3810,09 kN.
Bengkalis Regency is an island where almost all of its land is peat soil. Peat is a soillayer rich in organic matter. The organic matter that makes up the soil is formed from the remains of dead and weathered plants. This area is also located in the middle of the ocean and the absence of rivers and mountains in the area so construction materials were imported from Tanjung Balai Karimun. Coarse and fine aggregates in the area are exposed to high salt content also no fresh water meets the basic specifications of concrete design. This research uses additives to improve the quality of concretenamed Master Rheobuild 6. This study used cylindrical concrete measuring 105 x 210 mm and as many as 27 samples for testing compressive strength and porosity with a treatment period of 14 and 28 days. based on the results of compressive strength, the addition of 1.5% additive by weight of cement resulted in compressive strength of up to 35.39 MPa compared to normal concrete which only reached 32.71 MPa. Meanwhile, for the porosity test with the addition of 1.5% additive, the porosity value was 4.75% compared to normal concrete, which was 10.45%. This study highly recommends the use of this additive in concrete work so that based on the tests carried out, the quality of the concrete is high and the porosity is relatively small so it is not easy for water to enter the concrete which has an impact on the performance of the concrete material itself.
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