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Sholihin As’ad
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Evaluasi Penyebab Keterlambatan dalam Penyelesaian Proyek Konstruksi (Studi Kasus: Rosalia Indah Group) Puruhita, Hana Wardani; Suprapto, Mamok; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract

Proyek Konstruksi merupakan bentuk kegiatan yang berlangsung dalam jangka waktu terbatas, dengan sumber daya tertentu, untuk mencapai hasil dalam bentuk bangunan atau infrastruktur. Dalam pelaksanaan proyek konstruksi sering terjadi keterlambatan yang disebabkan oleh pihak-pihak yang terlibat. Keterlambatan proyek konstruksi dapat didefinisikan sebagai terlewatnya batas waktu penyelesaian proyek dari waktu yang telah ditentukan dalam kontrak, atau dari waktu yang disetujui oleh pihak terkait dalam penyelesaian suatu proyek. Keterlambatan proyek akan menyebabkan pembengkakan biaya serta hilangnya peluang untuk mengerjakan proyek yang lain. Oleh karena itu, penelitian ini dilakukan dengan tujuan untuk mengetahui faktor-faktor penyebab, dampak, dan cara mengatasi keterlambatan proyek yang dilakukan dengan menyebarkan kuisioner kepada 30 kontraktor yang berperan penting dalam proyek-proyek besar di Rosalia Indah Group. Dampak keterlambatan proyek dapat diindikasi menggunakan indikator biaya, waktu, dan pembayaran yang terlambat. Metodologi penelitian yang digunakan adalah deskriptif kuantitatif. Validitas dan reliabilitas data dianalisis diuji dengan SPSS (Statistical Product and Service Solutions). Kemudian hasil analisis dilakukan dengan menggunakan metode AHP (Analytical Hierarchy Process) supaya didapatkan bobot dari hasil survey kuisioner. Berdasarkan hasil analisis, diperoleh prosentase prioritas kriteria 5 faktor keterlambatan proyek di Rosalia Indah tertinggi yaitu: terjadinya perubahan desain oleh owner, perubahan spesifikasi pada saat proyek masih berlangsung, adanya pekerjaan tambahan, pelaksanaan jadwal proyek yang tidak sesuai, dan kekurangan tenaga kerja. Semua proyek yang diteliti mengalami keterlambatan dan berdampak pada pembengkakan biaya. Cara mengatasi faktor keterlambatan tersebut yaitu dengan cara owner tidak mengubah desain sewaktu-waktu dengan kapasitas yang besar. Kata Kunci : Keterlambatan proyek konstruksi, faktor, ranking, dampak, cara mengatasi, SPSS, AHP.
Shrinkage Behavior Of Steel Fiber Reinforced Concrete On Sandwich Layer Concrete Jibril, Ramadhan Al Mahdi; As’ad, Sholihin; Muslih, Yusep Purwana
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract

Shrinkage of concrete causes a serious problem in concrete. If concrete is restrained from shrinking, tensile stresses develop and it may exceed the tensile strength of concrete which causes the concrete cracks. One possible method to control or reduce the adverse effects of cracking due to shrinkage in concrete structures is the addition of fiber in the concrete. Steel fiber can improve structural strength, ductility, reduce crack widths and control the crack. In sandwich layer where its material comprises of steel fiber reinforced concrete and some other by plain concrete. The shrinkage behavior has been considerably different compared to fiber reinforced concrete and plain concrete. Therefore this study investigates the behavioral of shrinkage on the steel fiber reinforced concrete on sandwich layer concept. The test specimens were made by steel fiber dosages of 10kg/m3, 30kg/m3, 50kg/m3, 80kg/m3 and 100kg/m3 and some others for sandwich layer specimen with similar fiber dosages combined with plain concrete. The specimen form was cylinder 5 cm in diameter and 27 cm in high for drying shrinkage test. All samples were placed in open air on ambient temperature environment. The shrinkage was recorded on 1 day to 56 days. The shrinkage prediction for three year or 1000 days was also calculated. Both recorded and predicted shrinkage were then compared.. The test result showed that plain concrete experienced the highest drying shrinkage and the addition of steel fiber reduced the drying shrinkage that occurred at concrete. The greater amount of fiber contained in the concrete, the lower occurrence of drying shrinkage. The shrinkage on sandwich samples recorded moderate compared to plain concrete, however this shrinkage is higher compared to samples of fully fiber reinforced concrete at the same fiber dosage. The three group of samples; steel fiber reinforced concrete, sandwich concrete and plain concrete showed the same trend of shrinkage curves following the time of hydration. The presence of steel fiber in concrete can effectively hinder drying shrinkage and affected the crack that can reduce and control the shrinkage of concrete. Keyword: Shrinkage behavior, shrinkage prediction, SFRC, sandwich concrete, plain concrete, steel fiber..
The Rubberized Concrete For Crack Resistant Concrete Pavement Ghasheir, Fouad M. Ali Bin; Setyawan, Ary; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract

The concrete is the most used material in civil engineering world. The crumb rubber had been added to the concrete instead of fine aggregate to used in a walls as a sound insulator and less heat conduction compared with concrete without rubber. (Intesar et al, 2011). Many experiments were done to find out appropriate methods of rubber application. Commonly, fully replacing coarse aggregate (gravel) or fine aggregate (sand) with rubber is not appropriate because the loss of strength is too severe. However, with small portion of aggregates replaced, the loss in compressive strength was not significant. A research study by Khatib et al (1999) and Schimizze et al (1994) suggested that rubber should not exceed (17-20%) of the total aggregate volume. Whenever possible to use the waste tyres in the construction work, it is possible to find effective solutions to prevent environmental pollution. The aim of this research to investigate the property and crack resistant of rubberized concrete. This research used crumb rubber of waste tyres in a concrete as replacement of aggregate. Three dosage of crumb rubber (5,10 and 15)% by volume were used. One mixture of plain concrete was also tested as reference and compare the results to the standard specification of rigid pavement. Those mixtures then prepared for fresh concrete and hardened concrete test. Slump test was conducted for assessing the fresh concrete performance while for hardened concrete performance, the compressive strength at 3,14 and 28 days were tested, the restrained shrinkage for early age of concrete were tested for 6 hours from casting and the shrinkage measurements taken when the age of concrete 1,3,5,7,9,11,13,15,18,21,25, and 28 days. The results of this research show that the crumb rubber was an effective material to resist the cracks in concrete. The results of compressive strength show that the compressive strength decrease when the amount of crumb rubber increase. The results of shrinkage test and restrained shrinkage test show that the cracks in the concrete decrease when the amount of crumb rubber increase. The total crack length reduce by (18.6, 55.2 and 58.2%) when the aggregate was replaced by (5, 10 and 15%) of crumb rubber. The number of cracks reduce by (11.34, 42.67 and 49.34%) when the aggregate was replaced by (5, 10 and 15%) of crumb rubber. Keywords: crumb rubber, rubberized concrete, cracks, compressive strength, shrinkage, restrained shrinkage.
Influence Of Using Non-Standard Specimen On Compressive Strength Of Normal And High Strength Concrete Esbata, Abdulati Mohamed; Kristiawan, Stefanus Adi; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract

Compressive strength of concrete is one of the most important test for construction properties for quality control of concrete and design new constructions, there are different molds that are used for casting concrete specimen during the concrete works according to various standards at different countries. On the other hand, it is known that different shapes and sizes of concrete specimen can cause differences in the results of compressive strength. In this study the influence of specimen sizes and shapes on compressive strength of normal and high strength concrete are investigated using experimental study. The experimental study was conducted for six different specimen types cube 150 mm, cube 100 mm, cube 75 mm, cylinder Ø150x300 mm, Ø100x200 mm, Ø75x150 mm. At six different concrete strength level was 20,30,40,50,60 and 70 MPa according to standard cube specimen and tested at 28 Days of age. For The experimental study, hardened density, non-destructive tests (Rebound hammer and UPV), compressive strength and splitting tensile strength for different concrete strength level were performed and some analyses were done to obtain conversion factors and some relations between these tests. The results of analyses indicate that for all testing, there is a bigger influence of variation of size and shape of the specimens, by changing the compressive strength level. The compressive strength increases as the specimen size decreases.. Also The compressive strength of cube 150 mm is generally higher than strength cylinder Ø150x300 mm and The conversion factors of compressive strength between is varied from 0.76 to 0.88 for the designed cube compressive strength of 20 to 70 MPa. The conversion factors of compressive strength between standard and non-standard specimen at different concrete strength at 28 days to equivalent 150 mm standard cube specimen had been determined and presented in table 4.7. The correlation between (split tensile test / Schmidt hammer test/ UPV test) of standard specimen 150 x 150 mm cube to compressive strength of non-standard specimen had been determined. Keywords: compressive strength level, influence of specimen sizes and shapes, conversion factors, splitting tensile strength, Schmidt hammer test, UPV.
The Strength And Stiffness Modulus Of Thin Layer Hot Mix Asphalt Concrete At Various Temperature Elshawesh, Abdulhakim Mustafa; Setyawan, Ary; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract

Stiffness modulus of asphalt concrete mixture is one of the most important parameters for the flexible pavement design that is very susceptible from temperature and time loading. The stiffness modulus here may be defined as a measure of the load spreading ability of material. The stiffness of asphalt mixture can be measured through various laboratory researches and empirical methods. Various laboratory researches have been employed to measure this property of asphalt such as indirect tensile modulus test, ITSM. The aims of this research were to achieve the viability of using asphalt 60/70 pen with different temperature on strength and stiffness modulus on thin layer HMA (4 cm) compared to Asphalt Concrete Wearing Course (6.8 cm). The other purpose is to get to know the effect of the using thin layer HMA (4 cm) in different climate region. All of the asphalt concrete mixtures of thin layer HMA and AC-WC which were used in this research based on Marshall Mix design according to Indonesian standard (Bina Marga 2010). The laboratories tests which have been conducted in this research were: indirect tensile strength (ITS), unconfined compressive strength (UCS) and indirect tensile stiffness modulus (ITSM) at temperature 10°C, 20°C, 40°C and 60°C. In comparison with the results of indirect tensile strength test, indirect tensile stiffness modulus test and unconfined compressive strength test, it is noticed that the strength and stiffness modulus of thin layer hot mix asphalt was affected by the temperature which the temperature degree might increase to decrease or the way around. From the results of ITSM test for HMA and AC-WC showed that starting from the temperature 20°C to 60°C there is no significant value of stiffness behavior at them. However, there is slight different value at temperature 10°C mixture respectively. Keywords: Thin layer, AC-WC , Asphalt 60/70 pen, ITS test, UCS test & ITSM test @ (10 ºC , 20 ºC , 40 ºC , 60 ºC).
THE STRENGTH AND STIFFNESS MODULUS OF THIN LAYER HOT MIX ASPHALT CONCRETE AT VARIOUS TEMPERATURE Elshawesh, Abdulhakim Mustafa; Setyawan, Ary; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract

AbstractStiffness modulus of asphalt concrete mixture is one of the most important parameters for the flexible pavement design that is very susceptible from temperature and time loading. The stiffness modulus here may be defined as a measure of the load spreading ability of material. The stiffness of asphalt mixture can be measured through various laboratory researches and empirical methods. Various laboratory researches have been employed to measure this property of asphalt such as indirect tensile modulus test, ITSM.The aims of this research were to achieve the viability of using asphalt 60/70 pen with different temperature on strength and stiffness modulus on thin layer HMA (4 cm) compared to Asphalt Concrete Wearing Course (6.8 cm). The other purpose is to get to know the effect of the using thin layer HMA (4 cm) in different climate region. All of the asphalt concrete mixtures of thin layer HMA and AC-WC which were used in this research based on Marshall Mix design according to Indonesian standard (Bina Marga 2010). The laboratories tests which have been conducted in this research were: indirect tensile strength (ITS), unconfined compressive strength (UCS) and indirect tensile stiffness modulus (ITSM) at temperature 10°C, 20°C, 40°C and 60°C.In comparison with the results of indirect tensile strength test, indirect tensile stiffness modulus test and unconfined compressive strength test, it is noticed that the strength and stiffness modulus of thin layer hot mix asphalt was affected by the temperature which the temperature degree might increase to decrease or the way around. From the results of ITSM test for HMA and AC-WC showed that starting from the temperature 20°C to 60°C there is no significant value of stiffness behavior at them. However, there is slight different value at temperature 10°C mixture respectively. Keywords: Thin layer, AC-WC ,
THE STRENGTH AND CONSISTENCY OF SELF COMPACTING CONCRETE BY RICE HUSK ASH AS ADDITIVE Ahmad, Khalid Soliman; Kristiawan, Stefanus Adi; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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AbstractSelf-compacting concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. Many countries have the problem of shortage of conventional cementing materials. Recently there is  considerable  efforts  worldwide  by  utilizing indigenous and waste materials in concrete. One of  such  materials  is  the  rice  husk  which  under controlled burning. Rice Husk Ash (RHA), produced after the burning of Rice husks (RH) has high reactivity and pozzolanic property. The use of RHA in this experiment is expected to determine the effect of RHA on Self Compacting Concrete. The use of Rice Husk Ash of Self Compacting Concrete as a matrix cannot increase the compressive strength of the SCC. Highest value obtained at RHA 0% of 27.18 MPa and RHA 20% of 22.08 MPa. Silica (SiO2) content in RHA of 82.59% (due to uncompleted burning) showed insufficient standard value required to produce optimal CSH bond on concrete,  which is silica content of at least 85% to increase the strength of concrete. Temperature reaction increases due to the increasing of calcium oxide. This condition makes more calcium hydroxide released by cement when cement reacts with water. With the higher of calcium hydroxide so that the adhesion of cement will be reduced and makes the structure weaker and then cause a lower compressive strength. Keywords: SCC, fly ash, RHA, consistency, compressive strength
REHABILITASI LONGSORAN (SLIDE) PADA BADAN JALAN DI ATAS TIMBUNAN TINGGI PADA RUAS JALAN SIMPANG KALIANDA – BAKAUHENI PROVINSI LAMPUNG Kurnia, Ade; Surjandari, Niken Silmi; As’ad, Sholihin
Jurnal Teknik Sipil Vol 1, No 1 (2013): Jurnal Teknik Sipil
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Abstrak Latar Belakang: Kondisi topografi provinsi Lampung yang berbukit dan berlembah adalah salah satu masalah, karena banyak terbentuk jalan  di atas timbunan tinggi, yang secara teknis mempunyai resiko terjadinya amblasan dan longsoran.  Terjadi amblas badan jalan dan longsor pada ruas jalan nasional 020 (Simpang Kalianda – Bakauheni) tepatnya pada Km. 80+200 yang berada dalam wilayah kabupaten Lampung Selatan.  Perlu dipilih teknik rehabilitasi penanganan kerusakan badan jalan akibat tersebut yang cepat waktu pelaksanaannya, kuat dalam kualitasnya dan ekonomis.Metode:  Melakukan analisis perhitungan desain dalam teknik penanganan rehabilitasi longsoran.  Tahapan analisis meliputi desain plat beton sebagai alas dasar timbunan baru dengan perkuatan cerucuk kayu gelam dengan tujuan menahan penurunan yang terjadi akibat adanya keruntuhan kembali pada tanah timbunan eksisting.  Metode alternatif selanjutnya adalah dengan menggunakan geosintetic sebagai pemisah dan berfungsi untuk menambah kapasitas dukung tanah pada timbunan.Hasil:  Menggunakan dimensi pondasi plat beton sebagai penahan sisa keruntuhan, yaitu panjang = 12 m, lebar = 7 m dan tebal = 30 cm.  Kapasitas dukung tanah di bawah pondasi plat beton sebesar 58.062,25 kN masih mampu untuk memikul beban gross sebesar 11.355,52 kN di atasnya.  Kapasitas ijin kelompok tiang cerucuk dengan jarak tiang 2d mempunyai keruntuhan blok. Beban kerja maksimum kelompok tiang adalah pada tiang diameter 15 cm dengan jarak antar tiang 3d, yaitu sebesar 13.288 kN.  Desain kemiringan lereng mempengaruhi terhadap tinggi timbunan (H), penggelinciran, kapasitas dukung geosintetik dan tekanan tanah timbunan.  Kedalaman tanah di bawah timbunan (h) mempengaruhi terhadap keruntuhan geser timbunan dan perasan lateral.  Rehabilitasi longsor timbunan dipilih yang menggunakan plat beton dan tiang kayu (cerucuk) lebih ekonomis biayanya daripada penggunaan geosintetik dan penggantian gorong-gorong. Kata kunci:      longsoran, kapasitas dukung, pondasi plat, tiang cerucuk, geotekstil.
EVALUASI PENYEBAB KETERLAMBATAN DALAM PENYELESAIAN PROYEK KONSTRUKSI (Studi Kasus: Rosalia Indah Group) Puruhita, Hanna Wardani; Suprapto, Mamok; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract

Proyek Konstruksi merupakan bentuk kegiatan yang berlangsung dalam jangka waktu terbatas, dengan sumber daya tertentu, untuk mencapai hasil dalam bentuk bangunan atau infrastruktur. Dalam pelaksanaan proyek konstruksi sering terjadi keterlambatan yang disebabkan oleh pihak-pihak yang terlibat. Keterlambatan proyek konstruksi dapat didefinisikan sebagai terlewatnya batas waktu penyelesaian proyek dari waktu yang telah ditentukan dalam kontrak, atau dari waktu yang disetujui oleh pihak terkait dalam penyelesaian suatu proyek. Keterlambatan proyek akan menyebabkan pembengkakan biaya serta hilangnya peluang untuk mengerjakan proyek yang lain. Oleh karena itu, penelitian ini dilakukan dengan tujuan untuk mengetahui faktor-faktor penyebab, dampak, dan cara mengatasi keterlambatan proyek yang dilakukan dengan menyebarkan kuisioner kepada 30 kontraktor yang berperan penting dalam proyek-proyek besar di Rosalia Indah Group. Dampak keterlambatan proyek dapat diindikasi menggunakan indikator biaya, waktu, dan pembayaran yang terlambat. Metodologi penelitian yang digunakan adalah deskriptif kuantitatif. Validitas dan reliabilitas data dianalisis diuji dengan SPSS (Statistical Product and Service Solutions). Kemudian hasil analisis dilakukan dengan menggunakan metode AHP (Analytical Hierarchy Process) supaya didapatkan bobot dari hasil survey kuisioner. Berdasarkan hasil analisis, diperoleh prosentase prioritas kriteria 5 faktor keterlambatan proyek di Rosalia Indah tertinggi yaitu: terjadinya perubahan desain oleh owner, perubahan spesifikasi pada saat proyek masih berlangsung, adanya pekerjaan tambahan, pelaksanaan jadwal proyek yang tidak sesuai, dan kekurangan tenaga kerja. Semua proyek yang diteliti mengalami keterlambatan dan berdampak pada pembengkakan biaya. Cara mengatasi faktor keterlambatan tersebut yaitu dengan cara owner tidak mengubah desain sewaktu-waktu dengan kapasitas yang besar.Kata Kunci : Keterlambatan proyek konstruksi, faktor, ranking, dampak, cara mengatasi, SPSS, AHP. 
THE RUBBERIZED CONCRETE FOR CRACK RESISTANT CONCRETE PAVEMENT M. Ali Bin Ghasheir, Fouad; Setyawan, Ary; As’ad, Sholihin
Jurnal Teknik Sipil Vol 2, No 2 (2014): Jurnal Teknik Sipil
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Abstract  The concrete is the most used material in civil engineering world. The crumb rubber had been added to the concrete instead of fine aggregate to used in a walls as a sound insulator and less heat conduction compared with concrete without rubber. (Intesar et al, 2011). Many experiments were done to find out appropriate methods of rubber application. Commonly, fully replacing coarse aggregate (gravel) or fine aggregate (sand) with rubber is not appropriate because the loss of strength is too severe. However, with small portion of aggregates replaced, the loss in compressive strength was not significant. A research study by Khatib et al (1999) and Schimizze et al (1994) suggested that rubber should not exceed (17-20%) of the total aggregate volume. Whenever possible to use the waste tyres in the construction work, it is possible to find effective solutions to prevent environmental pollution. The aim of this research to investigate the property and crack resistant of rubberized concrete. This research used crumb rubber of waste tyres in a concrete as replacement of aggregate. Three dosage of crumb rubber (5,10 and 15)% by volume were used. One mixture of plain concrete was also tested as reference and compare the results to the standard specification of rigid pavement. Those mixtures then prepared for fresh concrete and hardened concrete test. Slump test was conducted for assessing the fresh concrete performance while for hardened concrete performance, the compressive strength at 3,14 and 28 days were tested, the restrained shrinkage for early age of concrete were tested for 6 hours from casting and the shrinkage measurements taken when the age of concrete 1,3,5,7,9,11,13,15,18,21,25, and 28 days. The results of this research show that the crumb rubber was an effective material to resist the cracks in concrete. The results of compressive strength show that the compressive strength decrease when the amount of crumb rubber increase. The results of shrinkage test and restrained shrinkage test show that the cracks in the concrete decrease when the amount of crumb rubber increase. The total crack length reduce by (18.6, 55.2 and 58.2%) when the aggregate was replaced by (5, 10 and 15%) of crumb rubber. The number of cracks reduce by (11.34, 42.67 and 49.34%) when the aggregate was replaced by (5, 10 and 15%) of crumb rubber.Keywords: crumb rubber, rubberized concrete, cracks, compressive strength, shrinkage, restrained shrinkage.
Co-Authors Abdulati Mohamed Esbata Abdulhakim Mustafa Elshawesh Ade Kurnia Ary Setyawan Chitra Hermawan Fouad M. Ali Bin Ghasheir Fouad M. Ali Bin Ghasheir, Fouad Hana Wardani Puruhita Hanna Wardani Puruhita, Hanna Wardani Hanna Yuni Hernanti Khalid Soliman Ahmad Kusno Adi Sambowo Mamok Suprapto Muslich, Yusep Niken Silmi Surjandari Pujiyanto Pujiyanto Ramadhan Al Mahdi Jibril Sami Saleem Akesh, Sami Saleem Steafanus Adi Kristiawan, Steafanus Adi Stefanus Adi Kristiawan Yusep Purwana Muslih