Stake-Out is a processes of transferring construction design to the real world so that Stake Out is highly imperative in a construction job. Stake-Out jobs in the middle and lower levels of construction industry are still using theodolite accompanying with calculator rather than using high-end instruments. The results of the study show that theodolite has lower accuracy compared to Total Station and other high-end instruments, such as GPS Geodetic and Laser Scanner. This research is aimed to determine the accuracy and precision of Theodolite in determining the horizontal distance of Stake Out measurement which staff reading is simulated using android App (Stake Out Guide). The results of experiment showed that the accuracy of Theodolite is 0.025 m meanwhile the precision is 0.12%.
In the era of the fourth industrial revolution, the implementation and integration of digital technology and physical processes are unavoidable in which teaching and learning geomatic are included. In the field, students generally make mistakes in calculation of horizontal distance and height difference that are caused by the error in staff reading or/and its recording. The general aim of this research is to develop geomatic application on android, so that it will be portable and easy to use in order to reduce the parallax and staff reading error in theodolite. In the design and development of GeomaticDroid Application, the Java and PHP programming languages were implemented and data were recorded in MySQL. Application testing and debugging were conducted using Android 7.0. In the field testing, GeomatikaDroid has shown consistencies in clarity, better legibility of staff reading and recording compared to conventional staff reading and recording method. GeomatikaDroid has maximum parallax error of 1 mm. Meanwhile, the measurement without GeomatikaDroid makes staff reading error of 18 mm. The z test of two independent samples proved that those two samples have significant differences in error.
This paper analyzes about the increasing of the strength by seismic load in RC square column structure which has been given CFRP external confinement. There are two specimens will be compared. They are C-1and C-1C. C-1 is control column and C-1C is column with CFRP external confinement. Analysis experimental result got that collapse C-1 column at plastic hinge zone and collapse C-1C column until the end of the test the demage of column surface from all of plastic hinge zone. They are effected by the concrete demage and colour of the resin CFRP changing and the increasing displacement 77% from the plan. From 3 strength parameters, show that C-1C increases its strength for P max increase 54,97%, δ max is 81,18% and M max is 55,36% for C-1.
Pasir Samboja merupakan material lokal Balikpapan yang relatif murah dan belum banyak digunakan dalam campuran beton oleh masyarakat Balikpapan. Hal ini karena material ini memiliki butiran yang sangat halus, yang mengakibatkan jenis pasir ini tidak masuk dalam ke 4 zona agregat halus yang merupakan syarat dalam campuran beton. Sehingga dalam penggunaannya pasir Samboja perlu dipadukan dengan jenis pasir lainnya yang memiliki butiran agak kasar. Tujuan penelitian untuk mendapatkan sifat fisik agregat halus lokal di Balikpapan dalam campuran beton dan mendapatkan proporsi paduan agregat halus lokal Balikpapan yang optimal ditinjau dari besarnya Kuat Tekan Beton. Dalam penelitian ini ada 66 mortar dan 66 silinder beton dengan variasi persentase pasir Samboja dalam agregat halus campuran beton. Hasil yang diperoleh menunjukan bahwa proporsi pasir Samboja yang memenuhi kriteria agregat halus dalam campuran beton adalah dibawah 70% dengan MHB 1,64 mendekati zona 4 (pasir Agak Halus). Benda uji P50 dengan proporsi pasir Palu sebesar 50% dan pasir Samboja sebesar 50% memberikan nilai kuat tekan beton terbaik pada umur 28 hari yaitu 31,33 MPa dengan peningkatan kuat tekan sebesar 7,11% terhadap S100 dan jika ditinjau dari tren kuat tekan yang terjadi adalah perpaduan pasir Palu dan pasir Samboja memberikan nilai yang baik pada P50 dan P60.
Balikpapan, East Borneo gateway, is a city that grows rapidly. There has been infrastructure expansions in both city centre and away from the city. Nevertheless, based on hazard index map, Balikpapan soil condition is belong to highly vulnerable area for floods and landslides disaster. CFRP material is a material that is still slightly used in Balikpapan. This condition appears because the lack of researches of this material to overcome the structure problem in Balikpapan. So that, because of landslides threat, a breakthrough in the form of research that is able to provide solutions to disaster management is a certain needed. The result of the study showed that the average concrete strength for 28 days of age TF specimens respectively. The full jacketing specimen with CFRP has proved that CFRP can increase the concrete strength even not as big as compared to CFRP ability to retain the concrete tensile and ductility.
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