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Civil Engineering Dimension

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Published by Universitas Kristen Petra Surabaya

ISSN : 14109530 EISSN : 1979570X DOI : -

Core Subject : Engineering,

Civil Engineering, Building, Construction & Architecture

The Civil Engineering Dimension (Dimensi Teknik Sipil) is a refereed journal, published twice a year, in March and September.

Arjuna Subject : -

Articles 453 Documents

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Managing Pre-Construction and Construction Risks on Project Sites in Abuja-Nigeria Richard A. Jimoh; Momoh A Sani; Abdulahi I Adoza; Isah Yahaya
Civil Engineering Dimension Vol. 18 No. 1 (2016): MARCH 2016
Publisher : Institute of Research and Community Outreach - Petra Christian University

Managing risks in construction projects has been acknowledged as a key direction process for the purposes of attaining the project goal in terms of time, cost, quality, safety, and environmental sustainability. Hence, the paper evaluated pre-construction and construction risks on active project sites in Abuja-Nigeria. This was achieved using survey method through the self-administration of 35 questionnaires to the professionals handling the 35 identified projects being undertaking at that time. Results showed that errors and omissions in design and improperly defined project scope had mean score values of 3.03 and 2.54, respectively, were the construction risks most experienced by the professionals during pre-construction. On the other hand, fluctuation in market prices and delays with mean score values of 3.14 and 2.74, respectively, were the construction risks experienced by the professionals during the construction phase of the projects. It is recommended that procurement methods such as construction management should be adopted and stakeholders should keep to their own side of the bargain to avoid unnecessary delays.

Owner and Contractor Perceptions Toward Factors Causing Delays in Structural and Finishing Works Andi A.; Lalitan D.; Loanata V.R.
Civil Engineering Dimension Vol. 12 No. 1 (2010): MARCH 2010
Publisher : Institute of Research and Community Outreach - Petra Christian University

A construction project comprises of a number of work packages, which are subjected to delays. These delays may be caused by many on-site factors. The aim of this research is to represent owner and contractors perceptions towards delay factors that frequently occur in structural and finishing works. Data for analysis were gathered by distributing questionnaire. A total of 198 sets of questionnaire were gathered and used for subsequent analyses. In general, design changes during construction are perceived by respondents as the most frequent factor to cause delay in all structural and finishing works. The results also show that there are a number of differences between owner’s and contractor’s perceptions towards the occurrences of the factors. Whilst most contractors concern that information factors related to project design and scope frequently causing delays in construction works, owners consider many contractor originated factors, as most frequent delay causes.

Design and Build: Perception of Project Owners and Contractors on Cost in Java, Indonesia Antonius W. Djojopranoto; Brad L. Benhart
Civil Engineering Dimension Vol. 19 No. 1 (2017): MARCH 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

Design-build (DB) is a project delivery that has already been used widely in USA, UK, Singapore and in other countries. However, it is not widely used in Indonesia and there are limited studies available on DB. The purpose of this paper is to quantify project owners’ and contractors’ opinions about the perceived benefits of DB in terms of cost in Java, Indonesia. The quantitative research design using survey study was conducted to evaluate stakeholders’ opinion on the impact of DB on cost. Survey forms with questionnaires were sent to ten project owners and ten contractors. Inferential statistics using t-test was used to compare the perception between them. The result shows that project owners and contractors agree that DB project delivery has some benefits on cost. However, implementation has to be improved in order for DB to be a preferable project delivery option.

Remediation of Diesel Fuel Contaminated Sandy Soil using Ultrasonic Waves Wulandari P.S.
Civil Engineering Dimension Vol. 12 No. 2 (2010): SEPTEMBER 2010
Publisher : Institute of Research and Community Outreach - Petra Christian University

Ultrasonic cleaning has been used in industry for some time, but the application of ultrasonic cleaning in contaminated soil is just recently received considerable attention, it is a very new technique, especially in Indonesia. An ultrasonic cleaner works mostly by energy released from the collapse of millions of microscopic cavitations near the dirty surface. This paper investigates the use of ultrasonic wave to enhance remediation of diesel fuel contaminated sandy soil considering the ultrasonic power, soil particle size, soil density, water flow rate, and duration of ultrasonic waves application.

Crack Mapping on Shear-critical Reinforced Concrete Beams using an Open Source Digital Image Correlation Software Benny Suryanto; Asdam Tambusay; Priyo Suprobo
Civil Engineering Dimension Vol. 19 No. 2 (2017): SEPTEMBER 2017
Publisher : Institute of Research and Community Outreach - Petra Christian University

Three reinforced concrete beams, one with no shear reinforcement and two others with shear reinforcement ratios of 0.4% and 1.1%, were tested to investigate the influence of stirrup spacing on the mode of failure, overall strength and ductility. The results show that the beam reinforced with closely-spaced shear reinforcement failed in a ductile manner, whereas the other two beams with large stirrup spacing and no stirrup exhibited only a small measure of ductility and failed in a brittle manner. The importance of the provisions of maximum spacing is highlighted to ensure adequate anchorage for the stirrups and prevent a premature shear failure to occur. The application of a non-contact monitoring system employing the open source digital image correlation software Ncorr, an ordinary digital camera and a smartphone is demonstrated to provide a visualization of the cracking process throughout the load history.

Estimating the Distribution of Air Voids in Concrete Beasman L.E.; McCuen R.H.
Civil Engineering Dimension Vol. 13 No. 1 (2011): MARCH 2011
Publisher : Institute of Research and Community Outreach - Petra Christian University

Chord length measurements are used to estimate the volumetric distribution of air voids within hardened concrete samples. The accuracy of the Linear-Traverse method is questionable because chord lengths do not directly represent the actual volumes of the air voids. Using computer simulation, randomly generated concrete samples were analyzed using the Linear-Traverse method to compute the distribution of air voids, the chord length gradation curve, the chord length-to-traverse ratio, and the air void volume gradation curve. The current chord-length approach significantly underestimated the air void content. A method that estimates that air void gradation curve from the chord length gradation curve is presented. The computer simulation results are supported by a conceptual analysis. To obtain the most accurate estimate of the air void content, computer analyses showed that at least 15 traverse lines should be regularly spaced on the concrete sample.

THE BUILDER?S LIABILITY BEYOND THE DEFECTS LIABILITY Johnson I IKPO
Civil Engineering Dimension Vol. 7 No. 1 (2005): MARCH 2005
Publisher : Institute of Research and Community Outreach - Petra Christian University

This paper reviews the obligations of a builder after the expiration of the contracted defects liability period using relevant decided cases. The common areas identified as forming the bedrock of litigation pertain to structural and dimensional stability, freedom from damp, durability, adequate drainage, good waste disposal works, and effective service installations. Particular reference is made to walls, roofs, and services, which from the pilot study account for about 46%, 23%, and 17% respectively of the total defects attributable to the builder. It is concluded that the builder is responsible for defects arising from his product till the effluxion of reasonable time, except he establishes an element of contributory negligence.

The Impact of Changing Storage Area on Flood Magnitude and Occurrence Kusumastuti, D.I.
Civil Engineering Dimension Vol. 14 No. 2 (2012): SEPTEMBER 2012
Publisher : Institute of Research and Community Outreach - Petra Christian University

This study focuses on the impact of combined catchment and storage upon flood occurrences and flood peaks. A significant factor that plays an important role of the combined catchment and storage is the ratio of contributing catchment area to storage area (AC/AS) where the impact significantly shows increasing frequency of storage overflow and flood peaks with the increasing of AC/AS. Some case studies examined in this work, i.e. Way Pegadungan (Lampung, Sumatra) and NagaraRiver (South Kalimantan) catchments show similar behavior. Swamps located on the sides of downstream of Way Pegadungan as well as Nagara River act as storages during flood events. The dyke which was planned to be built increases the ratio of AC/AS significantly as storage area reduced considerably. This has an impact on flood peaks which can increase considerably. The improved understanding of these process controls will be useful in assisting the management of such catchments, particularly to assist in flood prevention and mitigation.

MODEL STRATEGI PENAWARAN UNTUK PROYEK KONSTRUKSI DI INDONESIA Harry Patmadjaja
Civil Engineering Dimension Vol. 1 No. 1 (1999): MARCH 1999
Publisher : Institute of Research and Community Outreach - Petra Christian University

This research is a study on certain bidding strategy models, based on the maximum expected profit, as often used in developed countries. The models chosen for this research are: the Friedman model, the Gates model and the Ackoff & Sasieni model. Probability models to win were analyzed using discrete and normal distribution, and also with multi and single distribution. Bidding strategy models are rarely used or even discussed by the Indonesian contractors, though it will be the contractors' need in the coming globalization era in 2000. The chosen models were applied in various constructions tenders data obtained within the period 1994 - 1998. Two data sets were reserved for comparison purpose. It was concluded that the Friedman model gave the lowest bid, especialy when used with the multi discrete distribution. On the other hand, the Gates model and the Ackoff & Sasieni model could give higher optimum mark up. Abstract in Bahasa Indonesia : Penelitian ini melakukan studi atas berbagai model strategi penawaran yang didasarkan pada expected profit maximum yang pernah muncul dan digunakan di negara maju. Dari antaranya dipilih model-model dari Friedman, Gates dan Ackoff & Sasieni. Model-model didekati dengan berbagai bentuk distribusi diskrit maupun normal, serta distribusi tunggal maupun ganda. Model strategi penawaran selama ini belum banyak dibicarakan dan dibahas oleh pihak-pihak yang terlibat pada proyek konstruksi di Indonesia, padahal akan merupakan kebutuhan kontraktor dalam menghadapi tender terbuka pada era globalisasi di tahun 2000. Model-model tersebut kemudian diterapkan pada sejumlah data tender konstruksi di Indonesia yang berhasil diperoleh dari tahun 1994 sampai 1998. Hasil perhitungan diuji dengan dua data yang memang disisihkan untuk pengujian model tersebut. Dapat disimpulkan bahwa model yang menghasilkan penawaran paling rendah adalah oleh model Friedman, dan khususnya dengan distribusi diskrit yang berganda. Sebaliknya, model Gates atau Ackoff & Sasieni menghasilkan mark up optimum yang lebih tinggi. Kata kunci : probabilitas menang, penawaran, expected profit, mark up.

Effect of Coarse Aggregate Sizes and Replacement Levels on the Strength of Palm Kernel Shell (PKS) Concrete Olusola, K.O.; Babafemi, A.J.
Civil Engineering Dimension Vol. 15 No. 1 (2013): MARCH 2013
Publisher : Institute of Research and Community Outreach - Petra Christian University

The maximum coarse aggregate size used in concrete can impact on its strength. An investigation of the effect of coarse aggregate size and replacement level of granite with palm kernel shell (PKS) on the compressive and tensile strengths of PKS concrete were investigated. Mix proportion by weight of 1:1½:2 with w/c of 0.50 were used. All samples were tested at 7 and up to 90 days. Results showed that both compressive and splitting tensile strengths increased with increase in aggregate sizes. Both strengths however decreased with increase in replacement levels of granite with PKS. Optimum replacement level of granite with PKS was 25% with compressive and tensile strengths of 22.97 N/mm2 and 1.89 N/mm2 respectively at maximum coarse aggregate size of 20 mm. However, at 50% PKS content, which results in lightweight concrete, compressive strength was 18.13 N/mm2 which is above the minimum value of 17 MPa for lightweight concrete.

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