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Civil Engineering Dimension
ISSN : 14109530     EISSN : 1979570X     DOI : -
Core Subject : Engineering,
The Civil Engineering Dimension (Dimensi Teknik Sipil) is a refereed journal, published twice a year, in March and September.
Arjuna Subject : -
Articles 8 Documents
Search results for , issue "Vol. 8 No. 2 (2006): SEPTEMBER 2006" : 8 Documents clear
DEVELOPMENT OF NON-DESTRUCTIVE MONITORING SYSTEM FOR CHLORIDE PENETRATION INTO REINFORCED CONCRETE STRUCTURES Antoni Antoni
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (258.064 KB) | DOI: 10.9744/ced.8.2.pp. 99-105

Abstract

Reinforced concrete structures in marine environment are subjected to chloride penetration, which significantly degrades the structural performance due to the occurrence of corrosion in the steel reinforcement. The performance degradation of the structures would reduce the intended service life and caused higher maintenance and repair cost. Therefore, system to monitor chloride penetration into reinforced concrete before the starting corrosion of reinforcement is indispensable. An embedded probe system to detect chloride penetration into concrete was developed in Japan. This probe consists of a cementitious material body and some number of wires as sensors, which are set in the shallow ditches around the probe body. The system detect the chloride penetration by monitoring the initiation time of wire corrosion, it also has the advantages of continuous monitoring and early warning on the onset of corrosion in the reinforcement. However, the probe had not yet had high sensitivity for detecting critical chloride content in concrete. Therefore to increase its sensitivity, four types of improvements, namely partial coating of the wires, waterproofing on the probe body, filling the ditches with porous material and supplying small current on the wires were evaluated in this study. From the experimental result, it was observed that supplying small current and partial coating of the wires could improve the sensitivity of the probe significantly, while waterproofing treatment on the probe body and filling the ditches did not have significant contribution.
DILATANCY BEHAVIOR IN CONSTANT STRAIN RATE CONSOLIDATION TEST Berty Sompie; Katsuhiko Arai; Akira Kita
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (508.494 KB) | DOI: 10.9744/ced.8.2.pp. 63-72

Abstract

Subjected to remolded young clay, this paper shows that a lot of time dependent behavior in the standard consolidation (SC) and constant strain rate consolidation (CSRC) tests is represented systematically by a simple assumption concerning the time dependency of dilatancy. In the SC test, at the first stage of each loading step little dilatancy takes place and dilatancy begins to occur several minutes after step loading. In CSRC test, some time period after the stress state has entered the normally consolidated region, dilatancy tends to occur rapidly with the increase in stress ratio. Since most of dilatancy has taken place at the earlier stage of consolidation, little dilatancy occurs at the latter stage of CSRC process. This tendency makes the specimen stiffer with the passage of time, and makes the vertical pressure and pore pressure increase substantially at the last stage of CSRC process. Consideration to such behavior may be effective to correctly interpret the result of CSRC test.
THE SWELLING OF EXPANSIVE SUBGRADE AT WATES-PURWOREJO ROADWAY STA. 8 127 Agus Setyo Muntohar
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (171.376 KB) | DOI: 10.9744/ced.8.2.pp. 106-110

Abstract

Damage of structures and road beds due to expansive soil are common in Indonesia. One example is the deterioration of a road section at Sta. 8 + 127 of the Purworejo-Wates Highway. This Technical Note presents the investigation of the cause of the deterioration of the road bed. The author concludes that the sub grade is an expansive soil and the swelling pressure is able to lift the overlaying pavement and cause considerable cracking. Abstract in Bahasa Indonesia : Kerusakan struktur bangunan dan perkerasan jalan karena tanah ekspansif merupakan masalah yang banyak terjadi di Indonesia. Salah satu kerusakan perkerasan jalan yang terjadi karena tanah ekspansif adalah kerusakan perkerasan jalan di Sta. 8+127, Jalan Raya Purworejo-Wates. Technical Note ini menyajikan penyelidikan penyebab kerusakan perkerasan jalan tersebut. Penulis menyimpulkan bahwa tanah dasar di lokasi tersebut adalah tanah ekspansif dengan tekanan mengembang yang sanggup merusak struktur perkerasan jalan di atasnya.
STRENGTH SHRINKAGE AND CREEP OF CONCRETE IN TENSION AND COMPRESSION S A Kristiawan
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (328.148 KB) | DOI: 10.9744/ced.8.2.pp. 73-80

Abstract

Strength, shrinkage and creep of concrete in tension and compression have been determined and the relationship between those properties was studied. Direct tensile tests were applied to measure those properties in tension. The relationship of creep in tension and compression was determined based on the measurement of creep at similar stress and similar stress/strength ratio. It is found that concrete deforms more in tension than in compression. Except for concrete with a higher water/cement ratio, the use of pulverised fuel ash, ground granulated blast furnace slag, superplasticizer and shrinkage reducing admixture has no effect on strength. However, they affect creep and shrinkage of concrete.
THE PERFORMANCE OF TRADITIONAL CONTRACT PROCUREMENT ON HOUSING PROJECTS IN NIGERIA Stephen O. Ojo; Olabosipo I Fagbenle; Aderemi Y Adeyemi
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (167.71 KB) | DOI: 10.9744/ced.8.2.pp. 81-86

Abstract

The traditional contract procurement has been widely criticized as an ineffective procurement method because it often involves time and cost overrun on construction projects. Yet the method is still being widely used in Nigeria most especially for the procurement of housing projects. It is suspected that this procurement method may not be ineffective in all cost categories of housing projects. Therefore time and cost performances of the procurement method on 57 housing projects of varying cost categories initiated by the Nigerian government between 1993 and 1999 were studied. The category of one to five million naira (US$1.00 ≈ 92 Nigerian Naira in 1999) showed the least time overrun of 18.98% while the highest time overrun of 99.64 % was shown in the five to ten million naira. The over ten million naira category had the least cost overrun of 9.13% while the highest cost overrun of 34.55 % was shown in the less than one million naira. The one to five million naira cost category exhibited weak correlation between time and cost overruns but the five million naira and above categories showed strong correlation. It was concluded that one to five million naira cost category is quite suitable for traditional contract procurement on housing projects in Nigeria.
PENELITIAN MENGENAI PENINGKATAN KEKUATAN AWAL BETON PADA SELF COMPACTING CONCRETE Handoko Sugiharto; Tedy Gunawan; Yusuf Muntu
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (257.696 KB) | DOI: 10.9744/ced.8.2.pp. 87-92

Abstract

High Early Strength Self Compacting Concrete, a new phenomenon in the world of concrete technology, offers advantages such as high workability, high durability and high early strength characteristic that can well be applied especially in the pre-cast concrete industry. In this study the properties of High Early Strength Self Compacting Concrete is achieved by the use of admixture (hyper plasticizer) Glenium Ace-80 and Silica Fume Rheomac SF 100 as filler. The water-binder ratio is kept in the low level. The workability conditions are tested using workability test like Slump Cone, V-Funnel, and L-Shaped Box. To test the High Early Strength characteristic compression tests are carried out on 1, 3, 7, 14 and 28 days of concrete age. The tests were focused on the age 1 and 28 days. The test result shows that the use of 2.5 % Glenium Ace-80 and 2 % Silica Fume can fulfill both workability and high early strength requirement of Self Compacting Concrete High Early Strength by keeping the value of water-binder ratio in the low level. Abstract in Bahasa Indonesia : High Early Strength Self Compacting Concrete (HESSCC), sebuah fenomena baru dalam dunia teknologi beton, memiliki keunggulan workability, durabilitas dan kekuatan awal yang tinggi, sehingga dapat diaplikasikan dengan baik khususnya pada dunia usaha pre-cast concrete. Dalam penelitian ini digunakan admixture (hyperplasticizer) Glenium Ace–80 dan filler Silica Fume Rheomac SF 100 dengan water-binder ratio rendah. Pengujian workability dilakukan dengan menggunakan alat Slump Cone, V-Funnel dan L-Shaped Box, sedangkan tes kuat tekan beton dilakukan pada umur 1, 3, 7, 14, 28 hari. Tes kuat tekan ini diutamakan untuk umur 1 hari untuk kuat tekan awal dan 28 hari untuk kuat tekan akhir dari beton. Hasil penelitian menunjukkan penggunaan Silica Fume sebesar 2 % dan Glenium Ace-80 sebesar 2.5 % sudah mampu mencapai kriteria self compactible sekaligus kuat tekan awal (High Early Strength) yang baik pula, karena nilai water-binder ratio tetap dijaga pada nilai yang rendah
ANALISIS KONSERVASI ENERGI MELALUI SELUBUNG BANGUNAN Sandra Loekita
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (215.408 KB) | DOI: 10.9744/ced.8.2.pp. 93-98

Abstract

Ventilating and Air Conditioning system consumes 50-70% of the total energy used in an office building. The cooling load of a building consists of internal cooling load, i.e. loads produce by light, occupants, and heat generating power/appliances; and external cooling load, i.e. loads produce by radiation, conduction, and ventilation/infiltration through building envelope. To reduce the external cooling load, SNI 03-6389-2000 specifies that the Overall Thermal Transfer Value (OTTV) should be less than or equal to 45 Watt/m². This research supports energy conservation in finding the optimum building envelope design by specifying the Window to Wall Ratio (WWR) which will fulfill the OTTV requirement. Five office buildings in Jakarta, eight story and above are used in this study. The result shows that WWR less than or equal to 0.40 will produce OTTV value that suits the SNI 03-6389-2000 requirement. It is also shown that OTTV value is not the only factor that guarantees energy conservation. Abstract in Bahasa Indonesia : Sistem tata udara menggunakan 50-70% energi dari keseluruhan energi listrik yang digunakan dalam sebuah bangunan gedung perkantoran. Beban pendinginan dari suatu bangunan gedung terdiri dari beban internal, yaitu beban yang ditimbulkan oleh lampu, penghuni serta peralatan lain yang menimbulkan panas dan beban external yaitu panas yang masuk dalam bangunan diakibatkan oleh radiasi matahari, konduksi dan ventilasi/infiltrasi melalui selubung bangunan. Untuk mengurangi beban external, SNI 03-6389-2000 menentukan kriteria disain yaitu Overall Thermal Transfer Value (OTTV) harus lebih kecil atau sama dengan 45 Watt/m². Untuk mempermudah perencanaan untuk mendukung upaya konservasi energi penelitian ini berusaha mencari Window to Wall Ratio (WWR) yang dapat memenuhi OTTV yang disyaratkan. Studi dilakukan pada lima gedung perkantoran di Jakarta, yang memiliki ketinggian lebih dari delapan lantai. Hasil penelitian ini menunjukkan WWR lebih kecil atau sama dengan 0,40 menghasilkan nilai OTTV memenuhi syarat yang ditentukan oleh SNI 03-6389-2000. Ditunjukkan pula bahwa nilai OTTV bukan satu-satunya batasan yang menjamin gedung hemat energi
TINGKAT KEPERCAYAAN DALAM HUBUNGAN KEMITRAAN ANTARA KONTRAKTOR DAN SUBKONTRAKTOR DI SURABAYA Lendra Lendra
Civil Engineering Dimension Vol. 8 No. 2 (2006): SEPTEMBER 2006
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (259.542 KB) | DOI: 10.9744/ced.8.2.pp. 55-62

Abstract

Kemitraan merupakan salah satu solusi manajemen untuk meningkatkan kinerja dan mempererat hubungan antar partisipan dalam proyek konstruksi. Penelitian ini bertujuan untuk mengukur tingkat kepercayaan dan membahas kepercayaan sebagai salah satu faktor sukses kunci kemitraan antara kontraktor dan subkontraktor di Surabaya. Data diperoleh dengan survei menggunakan kuesioner untuk mengukur empat elemen tingkat kepercayaan berdasarkan teori Robert Bruce Shaw, yaitu: exhibiting trust, achieving results, acting with integrity dan demonstrating concern. Hasil penelitian menunjukkan bahwa secara umum tingkat kepercayaan antara kontraktor dan subkontraktor di Surabaya berada pada tingkat tinggi. Selain itu, penelitian ini juga menemukan adanya perbedaan tingkat kepercayaan, yang disebabkan oleh lama pengalaman di bidang konstruksi dan lama bekerja seorang individu di perusahaan yang bersangkutan, serta jenis proyek yang dikerjakan dan nilai pekerjaan yang disubkontrakan

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