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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.

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Articles 7 Documents

Search results for , issue "Vol. 6 No. 2 (2004): SEPTEMBER 2004" : 7 Documents clear

MOTIVASI PEKERJA PADA BEBERAPA PROYEK KONSTRUKSI DI SURABAYA Andi Andi; Dwi Djendoko
Civil Engineering Dimension Vol. 6 No. 2 (2004): SEPTEMBER 2004
Publisher : Institute of Research and Community Outreach - Petra Christian University

The role of worker motivation is very important in improving construction productivity. In order to increase the motivation, it is essential for management to understand needs of the workers as well as factors motivating and demotivating. This paper aims to determine the needs level, motivators, and demotivators of construction workers in Surabaya based on Maslow and Herzbergâs theories. For the methodology, the study conducted a questionnaire survey, and 263 workers participated in the survey. It is found out that the workers are still at the physiological needs level. Good salary and safety programs are two most important motivators for workers, whereas two most important demotivators are bad treatment by supervisor and insufficient material availability. The paper discusses the findings and proposes solutions to increase workers motivation. Abstract in Bahasa Indonesia : Motivasi kerja memiliki peranan yang penting dalam peningkatan produktifitas dalam industri konstruksi. Untuk dapat meningkatkan motivasi kerja pekerja perlu diketahui kebutuhan pekerja pada saat ini, serta pemahaman motivator dan demotivator pekerja oleh supervisor. Berdasarkan latar belakang ini, penelitian ini ditujukan untuk menentukan tingkat kebutuhan, motivator dan demotivator pekerja konstruksi. Untuk tujuan tersebut digunakan dua teori motivasi, yaitu teori Maslow dan teori Herzberg, dan dilakukan survei di beberapa proyek konstruksi di Surabaya dengan menggunakan kuesioner. Secara keseluruhan, 263 orang pekerja berpartisipasi dalam penelitian ini. Hasil penelitian menunjukkan bahwa pekerja konstruksi di Surabaya masih berada pada level physiological needs. Upah yang baik dan program keselamatan kerja yang baik menempati posisi tertingi sebagai motivator bagi pekerja. Sedangkan demotivator terpenting bagi pekerja adalah perlakuan yang buruk oleh atasan dan ketersediaan material yang kurang baik. Makalah ini membahas hasil yang didapatkan dan memberikan beberapa usulan untuk meningkatkan motivasi pekerja.

FACTORS INFLUENCING THE COMPRESSIVE STRENGTH OF FLY ASH-BASED GEOPOLYMER CONCRETE Djwantoro Hardjito; Steenie E Wallah; Dody M.J. Sumajouw; B.V Rangan
Civil Engineering Dimension Vol. 6 No. 2 (2004): SEPTEMBER 2004
Publisher : Institute of Research and Community Outreach - Petra Christian University

This paper describes the effects of several factors on the properties of fly ash based geopolymer concrete, especially the compressive strength. The test variables included were the age of concrete, curing time, curing temperature, quantity of superplasticizer, the rest period prior to curing, and the water content of the mix. The test results show that the compressive strength of geopolymer concrete does not vary with age, and curing the concrete specimens at higher temperature and longer curing period will result in higher compressive strength. Furthermore, the commercially available Naphthalene-based superplasticizer improves the workability of fresh geopolymer concrete. The start of curing of geopolymer concrete at elevated temperatures can be delayed at least up to 60 minutes without significant effect on the compressive strength. The test data also show that the water content in the concrete mix plays an important role.

RANCANG BANGUN ALAT UJI PERMEABILITAS BETON Handoko Sugiharto; Allan Surya; Koeshardiono Wibowo; Wong Foek Tjong
Civil Engineering Dimension Vol. 6 No. 2 (2004): SEPTEMBER 2004
Publisher : Institute of Research and Community Outreach - Petra Christian University

The permeability of concrete to water is an important factor that have an effect to durability of concrete structures having direct contact with water, such as port structures, bridges, and basements. In order to identify the permeability nature of concrete, permeability testing is needed. This paper presents a concrete permeability test equipment that was designed and built by the authors. The equipment can be used to conduct permeability tests by flow test as well as by penetration test method. The trial tests of the equipment by flow test method were conducted to 12 concrete speciments with water-cement ratio 0.4 and 0.5 and with wet and dry curing method. The averages of coefficients of permeability obtained differ in the range of 5%-26% from that obtained by using permeability test equipment made by Marui. In addition, the trial tests by penetration method were also conducted to six dry-cured concrete speciments with water-cement ratio 0.4 and 0.5. The averages of coefficients of permeability obtained from the penetration test differs from the flow test 23% and 90% for concrete of water –cement ratio 0.4 and 0.5, respectively. Abstract in Bahasa Indonesia : Permeabilitas beton terhadap air merupakan faktor penting yang mempengaruhi durabilitas struktur beton yang berhubungan langsung dengan air, seperti pelabuhan, jembatan, dan basement. Untuk mengetahui karakteristik permeabilitas beton diperlukan uji permeabilitas. Makalah ini menyajikan suatu alat uji permeabilitas beton terhadap air yang dirancang dan dibuat oleh penulis. Dengan alat ini uji permeabilitas beton dapat dilakukan baik dengan cara aliran maupun cara penetrasi. Ujicoba penggunaan alat ini dilakukan dengan cara uji aliran terhadap 12 sampel beton dengan variasi faktor air semen 0.4 dan 0.5 serta variasi curing kering dan basah. Rata-rata koefisien permeabilitas yang diperoleh berbeda sekitar 5%-26% dari yang didapatkan dengan alat uji permeabilitas buatan Marui. Dilakukan pula ujicoba dengan cara penetrasi terhadap enam sampel beton curing kering dengan variasi faktor air semen 0.4 dan 0.5. Rata-rata koefisien permeabilitas yang dari uji penetrasi berbeda dari yang dihasilkan dengan uji aliran masing-masing 23% dan 90% untuk beton dengan faktor air semen 0.4 dan 0.5.

APPLICATION OF PACKING THEORY ON GRADING DESIGN FOR POROUS ASPHALT MIXTURES Hardiman Hardiman
Civil Engineering Dimension Vol. 6 No. 2 (2004): SEPTEMBER 2004
Publisher : Institute of Research and Community Outreach - Petra Christian University

The design life of porous asphalt is shorter than dense mix as a consequence of permeability loss due to clogging and poor resistance to disintegration. To mitigate problems associated with clogging, double layer porous asphalt has been constructed in the Netherlands. This paper investigated a development of a new grading design for porous asphalt by varying percentage of aggregate with maximum sizes of 20, 14 and 10mm; a theory of packing was used. The most common method used for grading design is based on empirical, which does not relate the packing behaviour of the aggregate mass. The packing theory used in this study was facilitated by a vibratory compactor. It was found that mixtures containing aggregate sizes 14 and 10mm have a good permeability and stability, when vibrated for 65 second with a frequency of 40Hz, while for aggregates containing 20mm, to achieve the requirement for Marshall stability, the gradation needs to be modified. Properties of porous asphalt based on packing theory are better from the empirical grading from Spain (P-12).

WALL FORMWORK DESIGN George Ilinoiu
Civil Engineering Dimension Vol. 6 No. 2 (2004): SEPTEMBER 2004
Publisher : Institute of Research and Community Outreach - Petra Christian University

Perencanaan bekisting (Form Work) merupakan bagian penting dalam pelaksanaan struktur beton bertulang, bila tidak direncanakan dengan baik, tidak jarang kegagalan bekisting menyebabkan masalah pelaksanaan yang cukup rumit. Bekisting juga menjadi komponen biaya struktur beton bertulang yang cukup besar. Makalah ini memaparkan perencanaan bekisting, yang di Romania, merupakan bagian persyaratan untuk mendapatkan sertifikasi Insinyur Profesional.

MARKETING EXPENDITURES IN THE INDONESIAN CONSTRUCTION INDUSTRY Krishna Mochtar
Civil Engineering Dimension Vol. 6 No. 2 (2004): SEPTEMBER 2004
Publisher : Institute of Research and Community Outreach - Petra Christian University

In the 1960s, a ânewâ marketing concept known as "four Ps marketing mix" appeared and shifted the focus from the product to the customer. The objective of the new concept was not only profit, and the means of achieving the objective expanded to include the entire âmarketing mixâ: product, price, promotion, and place (channels and distribution). Expenditures of marketing in a company should be explored from these mixes, because each mix would have an impact on the total marketing expenditures. These four mixes are the main aspects of marketing and thus, should represent almost all expenditures in marketing in a company. From this research it is discovered that the responding contractors have only average efforts to improve or innovate their service, mostly using the latest construction methods and management approach. Correlated to their policy in the fourth mix (Place), they are still national oriented and not international oriented in marketing their services, this may lead to the big question of their survival; their motivation to innovate is only average while their target market is only national market. Their attitude to use more intensive âfeesâ policy rather than both product innovation and promotion is also interesting. Big percentage of the responding contractors assumes these âfeesâ are regular marketing practices. This attitude may better be stopped to make the construction industry practices healthier. Attitude to use more product innovation and true promotion approach in marketing in construction must be encouraged systematically in the future, to improve competitiveness in the long term.

ANALISA PRODUKTIFITAS PEKERJA DENGAN METODE WORK SAMPLING STUDI KASUS PADA PROYEK X DAN Y Andi Andi; koento danny wibowo; Andri Prasetya
Civil Engineering Dimension Vol. 6 No. 2 (2004): SEPTEMBER 2004
Publisher : Institute of Research and Community Outreach - Petra Christian University

There are various methods that can be employed to measure construction labor productivity. However it is difficult to measure accurately the labor productivity. Work sampling is a relatively easy- to-use method for measuring productivity. The main objective of this research is to analyze labor productivity on projects X and Y utilizing work sampling method. The productivity measure obtained from the analysis is labor utilization rate (LUR). Besides, this research is intended to investigate factors influencing the LUR in both projects by way of questionnaire. The work sampling analysis shows that in overall LUR of project X and Y was 55.13% and 44.45% respectively. Comparison of LUR on the same types of works indicates that productivity of project X was higher. The questionnaire analysis further confirms that in general the conditions of the influencing factors in project X were better that those in project Y, and that three factors were found significantly different, i.e. material, scaffolding and schedule. The research also details LUR analyses based on the labor working hours (morning, noon, and afternoon). Abstract in Bahasa Indonesia : Terdapat banyak metode yang bisa digunakan untuk mengukur produktivitas tenaga kerja di lapangan. Namun, pengukuran produktivitas tenaga kerja secara akurat sulit dilakukan. Work sampling adalah salah satu metode pendekatan yang bisa digunakan untuk mengukur produktivitas dengan cukup mudah. Tujuan utama dari penelitian ini adalah untuk menganalisa produktivitas pekerja pada proyek X dan Y dengan metode work sampling. Ukuran produktivitas yang didapat dari analisa ini adalah labor utilization rate (LUR). Selain itu, penelitian ini juga meninjau faktor-faktor yang dapat mempengaruhi LUR di kedua proyek tersebut dengan cara kuesioner. Hasil analisa work sampling menunjukkan bahwa secara keseluruhan LUR pada proyek X dan Y adalah 55,13% dan 44,45%, secara berturut-turut. Perbandingan nilai LUR pada jenis pekerjaan yang sama, menunjukkan bahwa produktifitas pada proyek X lebih tinggi. Analisa kuesioner menunjukkan bahwa secara umum keadaan faktor-faktor di proyek X lebih bagus dari pada di proyek Y, dan tiga faktor ditemukan berbeda secara signifikan, yaitu faktor material, perancah dan schedule. Penelitian ini juga melihat LUR berdasarkan jam kerja (pagi, siang, dan sore).

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