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STUDI PENGARUH AIR LAUT PADA MORTAR BETON NORMAL DAN MORTAR BETON DENGAN FLY ASH Qomaruddin, Mochammad; Nabella, Abda Rizka; Sitohang, Irene; Lie, Han Ay
Jurnal Teknik Sipil Vol 14, No 3 (2017)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Abstract: Fly ash is the residue of coal combustion in the form of grain which is transported by exhaust gas which can be used in the mortar and concrete manufacture. One of the main source of fly ash is the result of coal combustion at Tanjung Jati B power plant in Jepara. The purpose of this research is to observe fly ash-based mortar behavior toward compressive strength, flexural tensile strength, and absorption by substitution of cement with 20% fly ash precentage of mass ratio followed by immersion with freshwater and sea water taken from Jepara waters. this is used for the compressive strength of the cube 50 x 50 x 50 mm (ASTM C109 / C109M - 16), test specimens for testing the bending strength of 40 x 40 x 160 mm (ASTM C348 - 14), and 100 x 200 cylinders mm for observation of absorption behavior (ASTM C1585 - 13). Non-fly ash test specimens soaked in fresh water act as controls. Non-soaked seawater asphalt test subjects produce the highest compressive strength, but the speci-mens with freshwater-immersed fly ash show no higher yield. In contrast to the compressive strength results, the seawater-impregnated test specimens yield the lowest tensile strength, while the presence of fly ash in other test specimens has little effect. In the absorption test, the use of fly ash mortar with sea water bath resulted in increased velocity and absorption rate, whereas fly ash on specimens soaked in fresh water did not have a significant effect on the mortar absorption behavior.Â Abstrak: Fly ash adalah sisa hasil pembakaran batu bara berupa butir halus yang diangkut oleh gas buang yang dapat digunakan dalam pembuatan mortar dan beton. Salah satu sumber fly ash adalah hasil pembakaran batubara di PLTU Tanjung Jati B Jepara. Tujuan dari penelitian ini adalah untuk mengamati perilaku mortar berbasis fly ash terhadap kuat tekan, kuat tarik lentur, dan absorpsinya dengan melakukan substitusi semen dengan prosentase fly ash20% dari per-bandingan massa diikuti perendaman dengan air tawar dan air laut yang diambil dari perairan Jepara.Dalam penelitian ini digunakan benda uji untukkuat tekan berupa kubus 50 x 50 x 50 mm (ASTM C109/C109M â€“ 16), benda uji untuk pengujian kuat tarik lentur berbentuk balok 40 x 40 x 160 mm (ASTM C348 â€“ 14), dan silinder 100 x 200 mm untuk pengamatan perilaku absorpsi (ASTM C1585 â€“ 13). Benda uji tanpa fly ash yang direndam dengan air tawar bertin-dak sebagai benda uji kontrol. Benda uji tanpa fly ash yang direndam air laut menghasilkan kuat tekan tertinggi, tetapi benda uji dengan fly ash yang direndam air tawar tidak menunjuk-kan hasil yang lebih tinggi. Berbeda dengan hasil kuat tekan, benda uji tanpa fly ash yang direndam air laut menghasilkan kuat tarik lentur terendah, sedangkan keberadaan fly ash pada benda uji kategori lain memberikan dampak yang kecil. Dalam pengujian absorpsi, penggunaan mortar dengan fly ash dengan rendaman air laut mengakibatkanpeningkatkan ke-cepatan dan tingkat absorpsi, sedangkan fly ash pada benda uji yang direndam dengan air tawar tidak memberikan pengaruh yang berarti dalam perilaku absorpsi mortar.

STEEL-SLAG AS SUBSTITUTE TO NATURAL AGGREGATES, PROPERTIES AND THE INTERFACIAL TRANSITION ZONE Lie, Han Ay
TEKNIK Volume 30, Nomor 1, Tahun 2009
Publisher : Diponegoro University

Steel-slag is a residual product of the steel industry that has potential ability to pollute the ground water and soil containing heavy metals. To overcome this problem, attempts have been made for using the slag as substitute for both coarse and fine aggregates in concrete. The solidification process will prevent the metal components from polluting the water and soil. Test results on the mechanical properties of slag-concrete showed that while the compression strength of slag-concrete increased significantly as a function of slag-to-natural aggregateâ€™s use, the tensile strength dropped accordingly. The substitution of fine-slag to Muntilan sand was even more negative, the compression strength decreased as a function of slag use. Research into the influences of the Interfacial Transition Zone was conducted, since the ITZ itself forms a weak link within the concrete matrix. The SEM tests were performed at the Quarter Laboratory, Department of Geology in Bandung using a Scanning Electron Microscope type JEOL.

LABORATORY TESTING AND MODELING THE INTERFACIAL TRANSITION ZONE OF SLAG-CONCRETE Lie, Han Ay; Nuroji, Nuroji
MEDIA KOMUNIKASI TEKNIK SIPIL Tahun 17, Nomor 3, OKTOBER 2009
Publisher : Department of Civil Engineering, Diponegoro University

The transition zone at the aggregate surface has a distinctive formation, in terms of its mechanical as well as its physical properties. This layer is recognized as the ITZ (Interfacial Transition Zone) and considered the â€œweak linkâ€, since micro cracks are commonly initiated in this area. The properties of this ITZ are jet to be investigated. SEM (Scanning Electron Microscope) images only provide qualitative information such as formation, type and relative amount of crystals. Therefore, other means are required to represent a better understanding to the behavior of the ITZ. The mechanical and physical properties of the ITZ are highly influenced by the differentiation in porosity and strength. A mathematical or FEM (Finite Element Model) can be used to bridge this lack of information. This paper deals with the the modeling approach of ITZ as well as the concept of laboratory testing for validation of the model. Keywords: labour group composition, SNI 2002, field labourâ€™s productivity, middle-class housing. ABSTRAK Daerah peralihan antara agregat dan mortar memiliki susunan struktur dan sifat mekanis yang berbeda dengan mortar yang berjauhan dari agregate. Daerah ini dikenal sebagai ITZ (Interfacial Transition Zone) dan diketahui sebagai daerah yang â€œlemahâ€ karena retak mikro biasanya diawali di ITZ ini. Perilaku mekanis ITZ sangat sulit ditentukan secara tepat, pengamatan menggunakan SEM (Scanning Electron Microscope) hanya dapat memberikan gambaran secara kualitatif, berupa perilaku bentuk, susunan dan jumlah kristal sehingga perlu adanya pendekatan lain yang dapat memberikan nilai kuantitatif terhadap perilaku ITZ. Pengamatan terhadap sifat mekanis dan fisis ITZ terhadap mortar menunjukkan perbedaan kadar pori dan kekuatan. Untuk menggambarkan konfigurasi pori dan kekuatan ITZ dapat digunakan model, baik model matematis atau FEM (Finite Element Model) yang divalidasi dengan hasil pengujian laboratorium. Tulisan ini membahas konsep permodelan ITZ serta metoda validasi di laboratorium. Kata kunci: model, interfacial transition zone, mortar, aggregate, kekakuan

Evaluasi Kinerja Seismik Rangka Beton Pemikul Momen Khusus dengan PERFORM-3D Utomo, Junaedi; Ekaputri, Januarti Jaya; Antonius, Antonius; Lie, Han Ay
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 25, Nomor 1, JULI 2019
Publisher : Department of Civil Engineering, Diponegoro University

Seismic performance of reinforced concrete frame Buildings which have been designed as Special Moment Resisting Frames in accordance to three Indonesian codes (SNI 1727-2013, SNI 1726-2012 and SNI 2847-2013) can be evaluated using nonlinear dynamic analysis. Criteria related to strength such as component plastic rotation capacity, lateral displacement as well as criteria related to damage of elements in the structures were used to evaluate the seismic performance of the buildings. Assessment to the moment and curvature capacities of the cross sections of beams and columns were done using XTRACT. The global seismic performance of the structures depends on the seismic performance of components in the structures. In nonlinear model of the structures, the degrading strength of the components were modeled to take into account the gradual reduction of the contributed components to the resistance of the structures. PERFORM-3D is one of the software that can be used to generate nonlinear model of structures. Seismic performance level of structures can be obtained from the results of the nonlinear dynamic analysis using PERFORM-3D. The Seismic performance level can be utilized for: (1) detecting any weaker part in the structures, and (2) evaluating the improved design of the structures for enhancing the seismic performance of structures.

Sustainability Beton Metode Life Cycle Assessment Studi Kasus: Limbah Beton Laboratorium Bahan dan Konstruksi Departemen Teknik Sipil Universitas Diponegoro Semarang Sapulete, Christhy Amalia; Lie, Han Ay; Priastiwi, Yulita Arni
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 24, Nomor 2, DESEMBER 2018
Publisher : Department of Civil Engineering, Diponegoro University

Sustainability is an effort to build an infrastructure by considering the environmental impacts that occur. Concrete production as a construction material that commonly used in infrastructure development is one contributor to carbon dioxide (CO2) emissions. CO2 is produced from the calcination process in the manufacture of cement, burning of fossil fuels, and electrical energy used. More specifically by reviewing the calcination process on cement making, it has evaluated the consumption of cement in concrete production. The Life Cycle Assessment (LCA) is an environmental impact evaluation in terms of the life cycle of a product, wherein this paper, using the cradle-to-cradle scope, LCA is used as a method to evaluate cement consumption in concrete production to concrete waste management by taking concrete waste at Construction Laboratory and Materials Diponegoro University, Semarang for the case study. The results of the evaluation stated that the use of geopolymer concrete with fly ash as a substitute for cement could reduce up to 80% CO2 emissions with concrete strength 75% larger than conventional concrete. And for the concrete waste management, Construction Laboratory and Materials Diponegoro University reused concrete cylinder waste as a substitute material to build the retaining wall.

KAJIAN PERILAKU RUPTURE MELALUI SIMULASI NUMERIK Indriyantho, Bobby Rio; Pamungkas, Aditya Sage; Lie, Han Ay; Sukamta, Sukamta
Jurnal Karya Teknik Sipil Volume 2, Nomor 4, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Concrete is very common material used in reinforced concrete structure. There are several behaviors that influence its performance to the structure since its nonlinear behavior (Nawy, 1998). Nonlinear concrete behavior, besides can be obtained by experimental test result in laboratory, also can be conducted with one of the numerical simulation approach, namely finite element method. Based on the case, it will be conducted numerical modeling of concrete material with input the nonlinearity and orthotropic of concrete. Load-displacement response of concrete without reinforcement at small loading tends to linear then will be nonlinear when enters the cracking zone. Möhr and Kupfer failure criteria are used to evaluate the failure in concrete beam. Validation is a step conducted to view the validity from numerical study result that will be used as tools. Data resulted from experimental and numerical study is validated with research of Purkiss-Blagojevic (1993). This FEM program can be used as tools to analyze load-displacement response of concrete beam test specimen without reinforcement and predict the initial crack pattern happened.

PENGARUH BENTUK DAN KONFIGURASI AGREGAT TERHADAP KUAT TEKAN MORTAR Hutagalung, Martin; Setiawan, Yanuar; Lie, Han Ay; Sabdono, Parang
Jurnal Karya Teknik Sipil Volume 2, Nomor 3, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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This study aimed to investigate the influence of the shape and position of aggregate to compressive strength of matrix. Research conducted so far to say that the aggregate does not really affect the compressive strength of concrete and the opinions of experts who say that the aggregate rounded shaped is the aggregate are best used in the mix concrete . Therefore, there was a suggestion in this study to examine how the aggregate effect of the concrete compressive strength if we use the aggregate shaped beam (angular). That question will be answered by laboratory testing and modeling and analysis using software (SAP 2000). To determine the effect used variations size of aggregate measuring 2 x 2 x 5 cm and 2.5 x 1.5 x 5 cm at the time of casting is also variation in the position to determine the aggregate effect on the compressive strength of matrix. Tests conducted with uniaxial loading (one-way) and use the data logger and LVDT (Linear Variable Displacement Transducer), to measure the displacement that occurs. Through this research is expected, in addition to knowing their effects on the compressive strength of concrete, can also determine its relation to the concrete cracking pattern of voltage obtained when testing and validated by using SAP 2000.

STUDI EKSPERIMENTAL APLIKASI MATERIAL NANO FLY ASH TERHADAP KUAT TEKAN MORTAR BETON Astuti, Arini Wendy; Fathias, Endo; Purwanto, Purwanto; Lie, Han Ay
Jurnal Karya Teknik Sipil Volume 2, Nomor 3, Tahun 2013
Publisher : Departemen Teknik Sipil, Fakultas Teknik Universitas Diponegoro

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Mortar merupakan material yang tersusun dari pasir dan semen. Setelah proses pencampuran dengan air, maka pada mortar akan terbentuk rongga-rongga yang sangat kecil. Penelitian ini menggunakan material Fly Ash sebagai bahan tambahan pada mortar, dimana Fly Ash yang memiliki gradasi lebih kecil dari pasir diharapkan dapat mengisi rongga-rongga yang ditinggalkan saat proses pencampuran mortar. Fly Ash yang digunakan pada penelitian ini merupakan bahan sisa dari pembakaran batu bara PLTU Jepara, sehingga diharapkan dengan penggunaan Fly Ash ini juga dapat memberikan kontribusi bagi lingkungan dengan mereduksi limbah. Prinsip pengisian rongga dengan penambahan Fly Ash akan dikembangkan lebih jauh lagi pada penelitian ini, yaitu dengan menyadur teknologi untuk mengecilkan ukuran (teknologi nano) dengan menggunakan alat Planetary Ball Mill (PBM) yang akan diterapkan pada Fly Ash, sehingga menciptakan Fly Ash Nano. Dengan semakin mengecilnya ukuran Fly Ash menjadi Fly Ash nano, maka Fly Ash diharapkan dapat mengisi rongga yang lebih kecil lagi sehingga didapat kuat tekan yang lebih besar. Pada penelitian ini digunakan 3 variasi mortar yaitu Mortar Normal (MN), Mortal Fly Ash (MFA), dan Mortar Nano Fly Ash (MNFA), dengan variasi komposisi penambahan Fly Ash dan Nano Fly Ash berkisar antara 0% hingga 20%. Adapun perbandingan semen dan pasir digunakan sebesar 1 : 2,75, dengan besarnya FAS adalah 0,485. Dalam rangka mendapatkan hasil penelitian, maka benda uji akan dibuat ke dalam ukuran kubus 5 x 5 x 5 cm, dan akan diuji kuat tekannya dengan alat Universal Testing Machine di laboratorium bahan dan bangunan Teknik Sipil Universitas Diponegoro. Data kuat tekan tersebut akan dianalisa sehingga didapatkan perbandingan nilai kuat tekan antara benda uji MN sebagai benda uji kontrol, terhadap MFA dan MNFA, sehingga dapat dilihat kenaikan kuat tekan dengan penambahan Fly Ash maupun Nano Fly Ash. Hasil dari penelitian ini memperlihatkan bahwa penambahan material Fly Ash memberikan kontribusi terhadap Kuat Tekan Mortar. Hasil lebih baik ditunjukkan dengan penambahan Nano Fly Ash, dengan kuat tekan dari Mortar Nano Fly Ash mencapai 180% dari kuat tekan Mortar Normal. Dengan hasil tersebut maka dapat disimpulkan bahwa penerapan teknologi nano akan meningkatkan kuat tekan mortar.

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