Abstact -SNI 03-6861-1-2002, states that the fine aggregate used in concrete structures should use river sand. However, the use of fine aggregate in Fakfak regency in general is still dependent on sea sand potential is quite large. The purpose of this study were: 1) determine the characteristics of sea sand in Fakfak regency as a component of the concrete mix; 2) determine the strength of concrete resulting from the use of sea sand. This research is an experimental research laboratory by means of sample testing and analysis of the characteristics of aggregates and concrete compressive test using a compression test machine. Abstrak -SNI 03-6861-1-2002, menyebutkan bahwa agregat halus yang digunakan pada struktur beton sebaiknya menggunakan pasir sungai. Namun demikian penggunaan agregat halus di kabupaten Fakfak secara umum masih tergantung pada pasir laut yang potensinya cukup besar. Tujuan penelitian ini adalah : 1) mengetahui karakteristik pasir laut di Kabupaten Fakfak sebagai penyusun campuran beton; 2) mengetahui kuat tekan beton yang dihasilkan akibat penggunaan pasir laut. Penelitian ini merupakan penelitian eksperimental laboratorium dengan cara pengujian sampel dan analisis karakteristik agregat dan uji tekan beton menggunakan compression machine test. Hasil pengujian karakteristik agregat halus untuk quarry di Kabupaten Fakfak yang terdiri atas
In the construction of public infrastructures, especially road infrastructure, bridge construction work plays a very important role besides the construction of the road itself. One of the matters that deserves the attention of the planners in designing a bridge structure is the design of the substructure, this is because the substructure determines the quality and service life of a bridge. Besides, at present many cases of bridge structure failures are caused by failures of the substructure in holding the load acting on the bridge. This study aimed to determine the stability of the abutment to sliding failure and the stability of the abutment to overturning failure on the construction of the Aifa bridge in the Bintuni Bay Regency. From the results of the calculation of the stability of the abutments to sliding failure, when the abutments were in normal conditions, the obtained safety factor (SF) was 1.907. In the condition of the upper structure load was not working, the obtained safety factor (SF) was 1.045 and during earthquake conditions, the obtained safety factor (SF) was 1.419. While the results of the calculation of the stability of the abutments to overturning failure, when the abutments were in normal conditions, the obtained safety factor (SF) was 4.640. In the condition of the upper structure load was not working, the obtained safety factor (SF) was 1.658 and during earthquake conditions, the obtained safety factor (SF) was 3.159. Because the obtained safety factor (SF) values were greater than 1, the stability of the abutment to sliding failure and overturning failure are considered to be safe.
One that deserves the attention of planners in designing a bridge structure is the design of the substructure. This is due to the fact that the structure below determines the quality and service life of a bridge and at present many cases of bridge structure failures are caused by failures of the substructure in holding the load acting on the bridge The aim of this research to test the characteristics of the soil and calculate bearing capacity of the foundation based cone penetration testing data and soil parameters at the Aifa bridge construction field in Fafurwar District, Teluk Bintuni Regency, West Papua Province. From the results of testing the soil characteristics in the laboratory, the type of soil at point 1 is the type of good to bad graded sand soil (SW-SP) with a water content of 17.72%, specific gravity 2.98, liquid limit (LL) = 16,746% included in the non-plastic category. While the location of point 2 is obtained from good to bad graded sand soil type (SW-SP) with a water content of 28.52%, specific gravity 2.73, liquid limit (LL) = 16.746% including the non-plastic category. To analysis of the calculation of the bearing capacity of the foundation Aifa bridge using data from the sondir test results for point 1 was obtained allowable bearing capacity (Qall) is 4.610,44 kN and for point 2 was obtained allowable bearing capacity (Qall) is 3.598,43 kN. For calculating bearing capacity of the foundation using soil parameter data for point 1 was obtained bearing capacity allowable (Qall) is 2.209,93 kN and for point 2 was obtained allowable bearing capacity (Qall) is 655,41 kN
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