13 research outputs found
Survey, investigation and repairing on concrete wall of waste water treatment building
No full textWaste Water Treatment Building of the Multi National Company located in Cikande of Banten Province in Indonesia has experienced a poor function due to seepage and leakage on its reinforced concrete walls. The height of the reinforced concrete wall was 12 meters. This paper describes the surveys, investigations and repair conducted to overcome the seepage and leaks in the reinforced concrete walls. The feasibility of its concrete was investigated using Ultrasonic Pulse Velocity (UPV). The feasibility of the concrete was reviewed based on 2 (two) factors: (1) homogeneity and (2) crack depth. The result of the survey and investigation showed that the quality of homogeneity was enough and was pretty good and the average crack depth was about h = 102,5 mm. The method of repairing used was: (1) crack injection using epoxy, (2) leakage injection using cement modified polymer material and (2) waterproof coating using a cement-based coating. To prove the success of the repairing, pond testing was conducted for 14 days. Based on the test result, there was no leakage and seepage during the pond testing
Journal of Engineering and Technological Sciences : Volume 47, Nomor 3, July 2015
No full text1. On the development of a nomogram for alkali activated fly ash material (AAFAM) mixtures.
2. The effect of surfactant characteristics on IFT to improve oil recovery in tempino oil field Indonesia.
3. Parameters affecting the extraction process of jatropha curcas oil using a single screw extruder.
4. Bacteria as self-healing agent in mortar cracks.
5. Analytical study of wind influence on in-flight sprinkler droplets.
6. Development of indoor pollution concentration prediction by geospatial analysis.
7. Strenght properties of precessed fly ash concrete.
8. Integrated analysis of optimizing tubing material selection for get wells
STRUCTURAL DESIGN OF “ASURANSI ASTRA BUILDING” AT KAV 15 TB SIMATUPANG STREET, CILANDAK BARAT, JAKARTA
No full textIn earthquake prone area buildings have to be designed according to the
criteria specified in earthquake loading code. This final project will consider
“Asuransi Astra” building which is located at kav 15 Tb. Simatupang street,
Cilandak Barat, Jakarta. This building will be designed based on SNI 03 2847 -
2002, SNI 03 1729 - 2002 and SNI 03 - 1726 - 2002. The building will be
considered as dual system.
In analyzing “Asuransi Astra” ETABS non linear was used to obtain
internal forces of the structure. For columns and structural walls design the
PCACOL version 2.30 was used in order to obtain the longitudinal reinforcement.
For irregular building the effect of earthquake should be computed based on
dynamic analysis where V
dynamic
> 0.8 V
to satisfy SNI 03 - 1726 – 2002.
From building simulation, the first mode and the second mode of seismic
xiii
1
response were dominant in translation so its satisfy the requirement of SNI 03 –
1726 – 2002 section 7.1. From analysis was found that the service story drift Δ
=
6.4 mm < Δ
s
drift required = 14.12 mm, ultimate story drift Δ
drift = 38.08 mm <
Δ
m
m
drift required = 80 mm, so that both service story drift and ultimate story drift
have satisfy SNI 03 - 1726 – 2002. For designing truss, the author use WF 300 x
150 for beam and H 300 x 300 for column. The entire slab has the thickness 120
mm and designed as two way slab with reinforcement bar P10 mm. Except for
skew pararellogram, it will use D13. Stair has the thickness 120 mm, with
reinforcement bar D13 mm. Dimension of concrete beam is 800 mm x 400 mm,
longitudinal reinforcement for support area are 5D25 (top reinforcement), 3D25
(bottom reinforcement), longitudinal reinforcement for midspan area are 2D25
(top reinforcement), 3D25 (bottom reinforcement). Size of square column is 1000
mm x 1000 mm, longitudinal reinforcement has 24D25, and transversal
reinforcement has 4D16
The use of solar energy for the curing of ferrogeopolymer elements in the semiarid region
No full textKupang City in Timor Island of Indonesia, as a semiarid area, has abundant solar energy sources. Based on climatology data of Kupang City in 2013-2015, the minimum and maximum average temperatures in Kupang City range from 19.3-34.8oC. Besides, dry seasons last for about 8 months (April-November). This abundance of solar energy is a potential energy resource for the manufacturing of environmentally friendly ferrogeopolymer elements. Based on previous research, the production of geopolymer material can be done optimally with dry curing treatment at 60-80oC for less than 48 hours. Therefore, in this paper, a low-cost, energy efficient oven operated by a solar energy collector was developed. This paper describes a feasibility study of the use of solar energy for curing ferro-geopolymer elements. The ferro-geopolymer elements made were beams with length 600 mm, width 100 mm and height 100 mm. Wire meshes with 6x6mm of opening were used in 5 layers. The solar energy collector system used as an oven was a zinc coated drum which was painted black outwardly and was covered by a glass plate. Using this oven, it was possible to increase the ambient temperature by 1.62 to 2,37 times. Furthermore, this oven can also increase the flexure strength of ferrogeopolymer elements about ± 25.34%. This paper shows good potential use of solar energy in the manufacturing of ferro-geopolymer elements in the semiarid region
The use of solar energy for the curing of ferrogeopolymer elements in the semiarid region
No full textKupang City in Timor Island of Indonesia, as a semiarid area, has abundant solar energy sources. Based on climatology data of Kupang City in 2013-2015, the minimum and maximum average temperatures in Kupang City range from 19.3-34.8oC. Besides, dry seasons last for about 8 months (April-November). This abundance of solar energy is a potential energy resource for the manufacturing of environmentally friendly ferrogeopolymer elements. Based on previous research, the production of geopolymer material can be done optimally with dry curing treatment at 60-80oC for less than 48 hours. Therefore, in this paper, a low-cost, energy efficient oven operated by a solar energy collector was developed. This paper describes a feasibility study of the use of solar energy for curing ferro-geopolymer elements. The ferro-geopolymer elements made were beams with length 600 mm, width 100 mm and height 100 mm. Wire meshes with 6x6mm of opening were used in 5 layers. The solar energy collector system used as an oven was a zinc coated drum which was painted black outwardly and was covered by a glass plate. Using this oven, it was possible to increase the ambient temperature by 1.62 to 2,37 times. Furthermore, this oven can also increase the flexure strength of ferrogeopolymer elements about ± 25.34%. This paper shows good potential use of solar energy in the manufacturing of ferro-geopolymer elements in the semiarid region
On the Development of a Nomogram for Alkali Activated Fly Ash Material (AAFAM) Mixtures
No full textAlkali activated fly ash material (AAFAM) has become the most promising material to substitute materials based on ordinary Portland cement (OPC). However, there is no available nomogram for AAFAM mixtures. In contrast, there are many rational methods available in the literature to make paste, mortar and concrete with OPC based materials, such as Monteiro-Helene's nomogram, which uses Abram's law, Lyse's law and Molinari's law. This paper presents a study to construct such a nomogram for AAFAM mixtures by first conducting experiments on the paste and mortar phases. The procedure of Monteiro-Helene's nomogram was adopted in this formulation. The first step in this direction was to find a close relationship between the strength and paste composition of the material that can be used as a substitute for Abram's law. The second step was to construct the equivalent of Lyse's and Molinari's relationships by varying the sand and fly ash contents. The results show that it is possible to make a nomogram for AAFAM mixtures such as the one for OPC based materials. Class F fly ash and its mortar phase were used to construct the nomogram. In addition, the mortar samples that were used to build the nomogram had similar solidification products according to their microscopic characteristics
Pengaruh Substitusi Parsial Semen Dengan Abu Terbang Terhadap Karakteristik Teknis Beton
No full textPartly or totally substitution of cement with another environmentally products in making concrete become the alternative. In this research the composition of the fly ash used as a partial replacement of cement in concrete as much as 40% out of total mass of cement (High Volume Fly Ash Concrete) and then will be compared with normal concrete about the technical characteristics of the two types of concrete. The purpose of this research was to determine the effect of partial replacement of cement with fly ash in concrete on technical characteristics of concrete which are specific gravity of concrete, compressive strength of concrete and concrete abrasion. The results obtained by the technical characteristics of concrete at the concrete age of 56 days for normal concrete has an average of specific gravity is 2434.39 kg/m³ with an average of compressive strength is 22.72 MPa and concrete abrasion percentage is 19.74%, for HVFA concrete has an average of specific gravity is 2407.22 kg/m³ with an average of compressive strength of 22.51 MPa and concrete abrasion percentage is 20.12%. The result of this research shows that the effect of the partial replacement of cement with fly ash in concrete produce the technical characteristics of concrete which are specific gravity of concrete, compressive strength of concrete and concrete abrasion are similliar with the technical characteristics of normal concrete
Palm oil boiler ash as a viable substitute for cement
No full textThe production of ordinary Portland cement (OPC) is a major contributor to global CO₂ emissions, while the palm oil industry generates substantial solid waste, such as palm oil boiler ash (POBA). The research focuses on identifying optimal POBA replacement levels that maximize mechanical and durability performance in palm cement (PC) formulations. The aim is to develop high-performance, eco-efficient formulations that effectively reduce the reliance on conventional cement and minimize landfilling of agricultural waste. The physicochemical properties of POBA were characterized using X-ray fluorescence, scanning electron microscopy, X-ray diffraction, and particle size analyzer. The impact of nSO₂ content (0 - 3 %) on PC mechanical performance was assessed through compressive strength and deformation characteristics, informing optimal formulation. With a high SiO₂ content (58.13 %) and significant P₂O₅ (7.34 %), K₂O (7.88 %), and CaO (7.25 %), POBA’s chemical composition indicates strong pozzolanic potential, suitability for OPC replacement. POBA particles exhibit a broad and heterogeneous size distribution (polydispersity index = 1), with acceptable measurement quality (fit error = 0.08308) and 81.91 % within the measurement range. All PC concretes with 60 % and 70 % POBA substitution (PC1-PC9) exhibited compressive strengths exceeding 21 MPa after 56 days of curing. Optimal compressive strength for PC concrete with POBA substitution below 20 % was achieved with 9 % and 19 % POBA and 1 % nSiO₂ (PC9S1 and PC19S1), closely matching OPC performance. POBA substitution in PC product not only mitigates environmental impacts but also unlocks economic value from palm oil waste. Future studies should explore circular economy frameworks to further validate its sustainability
Studi Parametrik Pertemuan Balok Kolom Interior Pada Portal Beton Bertulang Menggunakan Metode Strut and Tie
No full textUntuk mendesain D-region diperlukan analisa yang lebih mendalam dengan berdasar pada bentuk trajektori tegangan elemen yang ditinjau. Tujuan dari penelitian ini adalah untuk mengetahui bentuk trajektori tegangan, jumlah tulangan serta konfigurasi penulangan pada daerah pertemuan balok kolom interior berdasarkan metode Strut and Tie dibandingkan dengan metode konvensional. Pada penelitian ini, pemodelan strut and tie dilakukan pada pertemuan balok kolom interior dari portal beton bertulang 2 lantai. Trajektori tegangan pada pertemuan balok kolom interior memiliki bentuk yang menyilang antara trajektori tekan dan trajektori tarik. Studi parametrik pertemuan balok kolom interior pada portal beton bertulang menggunakan metode Strut and Tie menghasilkan jumlah tulangan yang lebih sedikit dibanding metode konvensional dengan persentase perbedaan terhadap metode SNI 03-2847-2002 sebesar 14,18%, sedangkan terhadap metode R. Park dan T. Paulay sebesar 3,58%
