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study of the effect of soluble silicates (waterglass) and limestone on the compressive strength test, cohesion and modulus of soil stiffness

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AIP Conference Proceedings 2024年第1期3110卷

作者： Parea Rusan Rangan Miswar Tumpu Mansyur Mansyur Civil Engineering Department Faculty of Engineering Christian University of Indonesia Toraja Indonesia Disaster Management Study Program The Graduate School Hasanuddin University Makassar Indonesia Civil Engineering Department Faculty of Engineering SembilanBelas November University Kolaka Indonesia

In order to sustain the construction of a building, soil stability is crucial. In this study, clay soil had waterglass and limestone added to it. Given the current state of the soil, the researchers attempted to improve it by adding an activator, specifically limestone and waterglass, as an addition. This study will keep track of the soil’s compressive strength after it has been activated with waterglass and limestone. The waterglass variation is 7% of the overall weight, while the variations for the limestone mix are 5%, 10%, and 15%. According to the test results, the soil has a compressive strength of 0.86 kg/cm2, making it unsuitable for use as subgrade soil. The test findings showed that after adding waterglass activator and limestone, the compressive strength value of the free rose. As can be observed, adding 5%, 10%, 15% limestone and 7% waterglass and curing the mixture for a day resulted in unconfined compressive strength values of 4.82 kg/cm2, 6.76 kg/cm2, and 7.48 kg/cm2, respectively. The compressive strength measurements after 3 days of curing were 7.13 kg/cm2, 7.55 kg/cm2, and 11.24 kg/cm2, respectively. These findings suggest that adding waterglass activators and limestone can strengthen soil.

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Corrigendum to “Experimental and numerical investigation of SHS truss T-joints reinforced with sidewall plates” [Thin-Walled Struct. 145 (2019) 1–16]

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Thin-Walled Structures 2020年 146卷

作者： N.V. Gomes L.R.O. de Lima P.C.G. da S Vellasco A.T. da Silva M.C. Rodrigues L.F. Costa-Neves Structural Engineering Department UERJ – State University of Rio de Janeiro Brazil PGECIV - Civil Engineering Post-Graduate Program UERJ – State University of Rio de Janeiro Brazil INESCC Civil Engineering Department - University of Coimbra Portugal

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Student's Perception on Pedestrian Path Comfort in Yogyakarta State University

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IOP Conference Series: Earth and Environmental Science 2019年第1期366卷

作者： N Masyita Sativa Technical and Vocational Education Study Program Graduate School of Yogyakarta State University Indonesia Dept. of Civil Engineering and Planning Yogyakarta State University Indonesia

Pedestrian path is an important element for outdoor activities in urban environment, as well as in campus area. Yogyakarta State University (YSU) is a campus which is still in progress to develop its physical environment, includes pedestrian areas. The research aims to study student's perceptions in using pedestrian path in campus area, especially in comfort aspects (direct route, line safety, and line clarity). This study uses a descriptive qualitative method by giving questionnaires using google form application to students. As a result, it is concluded three comfort indicators of student's perception on their campus pedestrian. First, the degree of achievement for experience indicators is 70.61%; it means that the experience indicators giving a good influence on the perceptions of YSU students. Second, the indicator of attraction is 80.85%, shows a very good influence on the perception of the students. Meanwhile, indicator of expectation is 76.86%, it means that the expectation indicator giving a pretty good influence on the perception of YSU students on the comfort of pedestrian.

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Effects of ultraviolet-enhanced ozonation on the degradation of ammonia and urea in fertilizer plant wastewater

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IOP Conference Series: Materials Science and engineering 2019年第1期536卷

作者： AR Muhammad Yusuf. Farid Mulana Syahiddin Dahlan Said Post-Graduate Study Program Chemical Engineering Department Syiah Kuala University Darussalam-Banda Aceh 23111 Indonesia Chemical Engineering Department Syiah Kuala University Darussalam-Banda Aceh 23111 Indonesia

Ammonia and urea contained in fertilizer plant wastewater are pollutants to the environment. High concentration of ammonium and urea in wastewater can affects algae blooms in the ecosystem which will generate various diseases in aquatic biota. It is known that there are many methods for degradation of ammonium and urea contained in fertilizer plant wastewater. One of the potential method is ultraviolet-enhanced ozonation. Ozonation is oxidation with O3 that generates hydroxyl radicals which subsequently react with organic contaminants, while UV irradiation can break down O3 molecules and produce radical ions OH. The objectives of this study were to examine the effects of the utilization of the ultraviolet-enhanced ozonation method in degradation of various initial ammonium (100-300 ppm) and urea concentration (100-300 ppm) in inlet feed of ozonation-UV irradiation combination system. Some important variables such as contact time (0-120 minutes) and ozone feed rate of 0.2, 0.6, and 1.21 g/h were evaluated. Degradation process was carried out in two steps; ozonation and UV irradiation. Ozonation process was carried out in a contacting tank at a constant feed flow rate of 1.5 l/min and at room temperature, while UV irradiation process was conducted in pipeline equipped with a UV lamp at various contact time. The ultraviolet-enhanced ozonation could degrade ammonium and urea nitrogen up to 83.6% and 63.8%, respectively, at ozone feed rate 1,21 g/h, contacting time 60 and 120 min, initial feed concentration of ammonia (100 ppm) and urea (40 ppm).

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Effects of Ultraviolet-Enhanced Ozonation on Degradation of Ammonia and Urea in Fertilizer Plant Wastewater

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IOP Conference Series: Materials Science and engineering 2019年第1期536卷

作者： AR Muhammad Yusuf Farid Mulana Syahiddin Dahlan Said Post-Graduate Study Program Chemical Engineering Department Syiah Kuala University Darussalam-Banda Aceh 23111 Indonesia Chemical Engineering Department Syiah Kuala University Darussalam-Banda Aceh 23111 Indonesia

Ammonia and urea contained in fertilizer plant wastewater are pollutants to the environment. High concentration of ammonium and urea in wastewater can affects algae blooms in ecosystem which will generate various diseases in aquatic biota. It is known that there are many methods for degradation of ammonium and urea contained in fertilizer plant wastewater. One of potential method is ultraviolet-enhanced ozonation. Ozonation is oxidation with O3 that generates hydroxyl radicals which subsequently react with organic contaminants, while UV irradiation can break down O3 molecules and produce radical ions OH. The objectives of this study were to examine the effects of the utilization of the ultraviolet-enhanced ozonation method in degradation of various initial ammonium (100-300 ppm) and urea concentration (100-300 ppm) in inlet feed of ozonation-UV irradiation combination system. Some important variables such as contact time (0-120 minutes) and ozone feed rate of 0.2, 0.6, and 1.21 g/h were evaluated. Degradation process was carried out in two steps; ozonation and UV irradiation. Ozonation process was carried out in a contacting tank at constant feed flow rate of 1.5 l/min and at room temperature, while UV irradiation process was conducted in pipeline equipped with UV lamp at various contact time. The ultraviolet-enhanced ozonation could degraded ammonium and urea nitrogen up to 83.6% and 63.8%, respectively, at ozone feed rate 1,21 g/h, contacting time 60 and 120 min, initial feed concentration of ammonia (100 ppm) and urea (40 ppm).

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The competency component needed by the Project Manager in managing the Road Project in West Sumatera, Indonesia

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IOP Conference Series: Earth and Environmental Science 2020年第1期498卷

作者： Edrizal Mairizal Alzahri Muhd Zaimi Abd Majid School of Civil Engineering Faculty of Engineering Universiti Teknologi Malaysia 81310 Johor MY Post Graduate of Civil Engineering Universitas Bung Hatta 25133 Padang West Sumatera INA Program of Industrial Engineering Faculty of Engineering Universitas Pamulang 15417 Banten INA

Road construction and upgrading projects are currently being intensively implemented in West Sumatra, and this is very important in increasing the competitiveness of the Indonesian economy. During the construction period, it will give a positive impression to be able to reduce transportation costs, use value and labour productivity. In this case, a project manager will play an important role in the success of the project. There are some opinions that a project manager will determine the likelihood of a project success, even though their projects often facing big problems. In this paper, the focus is on determining the competency component of the Road Project Manager in West Sumatra in implementing the Project Management concept that leads to project success. Based on this and in accordance with this study, the approach used in data collection and processing is a qualitative. The results of the factor analysis are shown to the experts, to establish that all of these factors are important in developing the success of the project managed by the Project Manager. The results of the factor analysis obtained 65 combined factors what has been validated by experts. In conclusion, all these factors are important in determining the performance of a Project Manager in West Sumatra.

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Solid State Fermentation of Rice Straw Pulp with a Local Trichoderma reesei for Single Cell Protein Production: Effects of Temperature, Initial Medium pH and Fermentation Time

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IOP Conference Series: Materials Science and engineering 2019年第1期536卷

作者： E Novita M Zaki S D Said Post-Graduate Study Program Chemical Engineering Department Faculty of Engineering Syiah Kuala University Darussalam-Banda Aceh 23111 Indonesia Chemical Engineering Department Faculty of Engineering Syiah Kuala University Darussalam-Banda Aceh 23111 Indonesia

Indonesia is one among countries that produce abundant of rice straw every year generated as post-harvesting residue from paddy field all over country. This abundant amount residue is highly potential to be utilized as carbon source in producing single cell protein (SCP) in solid state fermentation system. SCP is a microbial protein that can be used as alternative protein for substitution of available conventional protein sources such as; fish meal, soy bean, and corn Stover for animal feed production. This research was conducted to evaluating the effects of initial medium pH of substrate (mixed rice straw pulp-urea), fermentation time and fermentation temperature on SCP production by Trichoderma reesei in solid state fermentation (SSF). The results showed that the highest SCP yield (19.71%) was produced at the initial medium pH of 5 and temperature of 30 °C at SSF conditions of C/N ratio 20:1 for 12 days of fermentation time.

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Self-supporting method;an alternative method for steel truss bridge element replacement

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Journal of Physics: Conference Series 2017年第1期909卷

作者： Muhammad Arsyad Senot Sangadji Sholihin As'ad Civil Engineering Department of Post Graduate Program Universitas Sebelas Maret Surakarta Jl. Ir. Sutami 36A Kentingan Jebres Surakarta 57126 INDONESIA

Steel truss bridge often requires replacement of its element due to serious damage caused by traffic accidents. This replacement is carried out using temporary supporting structure. It would be difficult when the available space for the temporary structure is quite limited and or the position of work is at a high elevation. The self-supporting method is proposed instead of temporary supporting structure. This paper will discuss an innovative method of bridge rehabilitation by utilizing the existing bridge structure. It requires such temporary connecting structure that installed on the existing bridge element, therefore, the forces during replacement process could be transferred to the bridge foundation directly. By taking the case on a steel truss bridge Jetis Salatiga which requires element replacement due to its damages on two main diagonals, a modeling is carried out to get a proper repair method. Structural analysis is conducted for three temporary connecting structure models: 'I,' 'V,' and triangular model. Stresses and translations that occur in the structure are used as constraints. Bridge bearings are modeled in two different modes: fixed-fixed system and fixed-free one. Temperature load is given in each condition to obtain the appropriate time for execution. The triangular model is chosen as the best one. In the fixed-fixed mode, this method can be carried out in a temperature range 27-28.8° C, while in fixed-free one, the temperature it is allowed between 27-43.4 °C. The D4 is dismantled first by cutting the D4 leaving an area of 1140.2 mm2 or 127 mm web length to enable plastic condition until the D4 collapses. At the beginning of elongation occurs, immediately performed a slowly jacking on a temporary connecting structure so that the force on D4 is gradually transferred to the temporary connecting structure then the D4 and D5 are set in their place.

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Identifying occurrences of accident at work place in terms of occupational safety on roads and bridges infrastructure in Indonesia

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IOP Conference Series: Materials Science and engineering 2019年第1期513卷

作者： Mairizal Edrizal Mohammad Ismail Rosli Mohamad Zin School of Civil Engineering Faculty of Engineering Universiti Teknologi Malaysia 81310 Johor Malaysia Program of Industrial Engineering Faculty of Industrial Technology Universitas Pamulang 15417 Banten Indonesia Post Graduate of Civil Engineering Universitas Bung Hatta 25133 Padang West Sumatera Indonesia

The economic growth of a country will be greatly influenced by road and bridge infrastructure that serves as a connecting flow of goods and human transportation. There are still some road and bridge construction projects in Indonesia that show the occurrence of accidents because lack of awareness by the management of the adverse effects of safety. Therefore, the author tries to find solutions to the improvement measures in minimizing the occurrence of occupational accidents by providing safety knowledge to the Project Managers and related staff, to be more concerned about the safety and the environment around the project. Based on data collected from the Ministry of Public Works and Indonesian People's Housing, there are several work accidents in toll road projects in Indonesia from August 2017 to February 2018. When viewed from several of these accidents, it can be concluded that the main cause is the lack of knowledge of the management staff about the need to enforce safety regulations, especially in the work of lifting object to the upper structure. Therefore, a commitment is needed to implement serious occupational safety regulations from all stakeholders who play a role in developing this infrastructure project.

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Rapid and in-depth analysis for seismic risk evaluation

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Journal of Physics: Conference Series 2017年第1期909卷

作者： Novi Dwi Astuti Meli Anta Alvita Senot Sangadji AP Rahmadi Edy Purwanto Civil Engineering Department of Post Graduate Program Sebelas Maret University Jl. Ir. Sutami 36A Kentingan Jebres Surakarta Postal Code 57126 INDONESIA

The high public demand on housing in urban areas requires the government of Indonesia to adopt a policy of encouraging the development of vertical housing. Cilacap has been allocated Rusunawa (low-income apartment) development in 2006. Evident from some earthquakes occurrence in recent years, however, Cilacap may be seen as an earthquake prone region which posing some risk to this type of vertical structures. The Appropriate strategy should be performed to evaluate the seismic risks of this local government owned four stories low-income apartment. This paper demonstrates two tier evaluation strategy; rapid evaluation and in-depth analysis and compares both results. First evaluation was conducted by means of Building Rapid Visual Screening (RVS) of FEMA 154 of the Rusunawa block A and B. The result was used further to calculate seismic risk score (SR) which exhibit the probability of the building damage given the Maximum Considered Earthquake (MCER) that will occur during the Rusunawa service life. The in-depth analysis was conducted by developing fragility function expressed in the form of fragility curves for the Rusunawa. The fragility shows the probability that certain damage states will be exceeded given the intensity of earthquakes which will occur during building service life. The fragility was developed as lognormal curves in which the building response to earthquake input was analyzed by means of pushover.

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