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Articles 313 Documents
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ANALYSIS OF CONCRETE COMPRESSIVE STRENGTH WITH PARTIAL SUBSTITUTION OF IRON POWDER WASTE AS FINE AGGREGATE DELLA GIOVANNI; YONAS PRIMA ARGA RUMBYARSO; BERMANDO SIAGIAN
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

This study evaluates the use of iron powder waste as a partial replacement of fine aggregate in concrete to reduce environmental impacts. By testing various percentages of iron powder (0%, 7.5%, and 12.5%), this study analyzed the compressive strength of concrete at the ages of 7, 14, and 28 days. The results showed that the addition of iron powder tended to reduce the compressive strength of concrete compared to normal concrete. Concrete with 7.5% iron powder had better compressive strength compared to 12.5%, but both had not reached the expected compressive strength. Further research is needed to find the optimal combination of iron powder and other additional materials.
ANALYSIS OF CONCRETE COMPRESSIVE STRENGTH WITH COCONUT FIBER WASTE AS A PARTIAL REPLACEMENT OF FINE AGGREGATE ISMAIL; YONAS PRIMA ARGA RUMBYARSO; GALI PRIBADI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

Although concrete is less strong in resisting tensile loads, the addition of fibers makes it a more resilient construction material, especially fiber concrete which is abrasion resistant and has better tensile, flexural and compressive strengths. In Indonesia, coconut fibers, which have been used since prehistory as a building material, are now being utilized as an additive in cement, thanks to their advantages in absorbing water and having good tensile strength. The use of coconut fibers not only increases the flexibility and strength of concrete, but also utilizes household waste that is difficult to recycle to create high-quality construction materials that are more durable and less prone to cracking. The results of testing the compressive strength of normal concrete at 28 days showed that without coconut fiber waste, the compressive strength was 440 kN (f´c 24.91 Mpa). With the addition of 5% coconut fibers, the compressive strength dropped to 318 kN (f´c 18 Mpa), and with 10% coconut fibers, to 292 kN (f´c 16.53 Mpa), showing the effect of fibers on the mechanical properties of concrete.
EVALUATION OF FACTORS AFFECTING DELAY IN UJUNG MENTENG FLAT HOUSING PROJECT WORK CHANDRA PURNOMO ADJIE; GITA PUSPA ARTIANI; INDRIASARI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

Economic growth in DKI Jakarta has driven significant infrastructure development, from buildings to public transportation, which play a vital role in people's lives. Smooth development will have a big impact, while delays in construction projects can result in losses and conflicts due to deviations from the set schedule and quality. This forces construction companies to develop rapidly and demands effective strategies to overcome problems that cause delays. For example, the Ujung Menteng Flats project which started on December 4, 2019 and aims to target low-income people in Jakarta, experienced a deviation of -0.271% from the plan, which triggered research on the factors causing this delay. Research using the correlation test method shows several main factors causing delays in the Ujung Menteng Flats construction project, including Cost, Tools, Labor, Management, Weather, and Pandemic factors, with a significant correlation level. Cost is the most dominant factor. The study recommends improving financial planning and management to reduce delays and complete projects on budget, as well as improving project management and the availability of tools and labor.
ANALYSIS OF THE USE OF ACRYLIC WASTE AS A PARTIAL SUBSTITUTION OF COARSE AGGREGATE FOR CONCRETE COMPRESSIVE STRENGTH DEDY RAMADHAN; ACHMAD PAHRUL RODJI; INDRIASARI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
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Abstract

Acrylic, or polymethyl methacrylate, is a synthetic polymer that has superior properties compared to glass, such as flexibility, light weight, easy to process (cut, drill, polish), and can be formed into various complex shapes through thermal processes. This material has advantages in resistance to impact and weather conditions, and is environmentally friendly because it can be recycled. Acrylic is widely used in industries, including advertising, automotive, and interior design, due to its ease of processing and aesthetics. However, the production of acrylic products is still considered inefficient and expensive, triggering the need for new tools for the bending process to increase the efficiency of making acrylic-based products. Based on the results of the average concrete compressive strength test for normal concrete at the age of 28 days is 11.94 Mpa, the compressive strength results are less than the planned concrete quality of 25 Mpa; Based on the research results, it was found that concrete using acrylic waste as a partial replacement for coarse aggregate at the age of 28 days at a variation of 3% was 13.94 MPa, a variation of 5% was 24.87 MPa and a variation of 7% was 7.97 MPa, so it can be concluded that the more acrylic waste mixture for the compressive strength of concrete, the results will decrease.
ANALYSIS OF FLEXURAL STRENGTH OF BEAM USING SUBSTITUTION OF BROKEN GLASS BULB AS FINE AGGREGATE ADDITIONAL MATERIAL FADLUL ADLI; ACHMAD PAHRUL RODJI; SUKADI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
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Abstract

Concrete is the main material in building construction, consisting of a mixture of coarse aggregate (gravel), fine aggregate (sand), cement, and water. Concrete is widely used because of its strength, ease of forming, and durability. The SNI standard defines concrete as a mixture of portland cement, aggregate, and water to which other materials can be added to form a solid mass. With the high demand for concrete with compressive and flexural strength, innovations continue to be developed, including the use of substitute materials such as broken glass bulbs to improve concrete quality. This study will examine the effect of broken glass bulbs on the flexural strength of concrete. The use of glass bulb waste increases the flexural strength of concrete. The increase depends on the percentage of waste in the concrete mixture, with test results showing an increase in flexural strength of 0.5 - 2 KN compared to normal concrete. In experiments with 5% and 10% waste, the flexural strength of the beam reached 27 KN and 25 KN after 28 days, respectively, while normal concrete had a flexural strength of 26 KN. These results meet the Indonesian National Standard SNI 03 - 4431 1997.
THE EFFECT OF USING RUBBER SEED WASTE ON K-300 COMPRESSIVE STRENGTH TEST (f’c 25 MPa) MUHAMMAD JAMALUDIN; GALI PRIBADI; LYDIA DARMIYANTI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
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Abstract

Modern construction technology has evolved with the principle of environmental concern through various innovations that support environmentally friendly construction. This includes the use of natural materials, procedures that minimize the use of hazardous resources, and techniques that produce minimal waste. The industry is also faced with the challenge of increasing demand for building materials due to population growth, which is addressed by utilizing local resources and waste, such as rubber seed shells as an alternative to conventional materials. The history of rubber use in Indonesia began with the introduction of seeds by Henry A. Wickham in 1876, with further development in the late 19th century. Based on the results of the research that has been conducted and the discussion in the previous chapter regarding the variation of the use of rubber seed shell waste of 0%, 5%, and 10%, the following conclusions can be drawn: The results of the ordinary concrete compressive strength test at the age of 28 days reached 440 kN (fc'24.91 Mpa), while variation 1 of 5% rubber seed waste reached 317 kN (fc' 17.95 Mpa), and variation 2 of 10% rubber seed waste reached 274 kN (fc'15.51 Mpa).
IDENTIFICATION OF CAUSING FACTORS FOR THE NON-APPLICATION OF SMK3 BASED ON ISO 45001 CLAUSES 6,7,8 AT PT X IN 2024 RIZKI HERWANSYAH; LYDIA DARMIYANTI; INDRIASARI
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
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Abstract

Occupational Safety and Health Management is the process of controlling risk and creating a safe and productive work environment which is a component of the company's management system. Factors that hinder companies from implementing SMK3 in accordance with ISO 45001 are the lack of support from management to implement SMK3 and safety officers who are not competent in their fields. This study is a descriptive qualitative study where data collection is carried out directly on workers, in-depth interviews and filling out questionnaires, with a research sample of 18 respondents. The results of the study showed that the company had not implemented SMK3 based on ISO 45001, from the results of observations, interviews and filling out questionnaires. Respondents on average did not know more about SMK3, because safety officers did not socialize the K3 policy regarding SMK3 in accordance with ISO 45001. The company must conduct general K3 expert training and other training related to K3 for safety officers so that officers are competent, and provide more support from management and others so that SMK3 can be implemented in the company
ANALYSIS OF INDUCTION MOTOR EFFICIENCY DECREASE DUE TO CAGE BALL BEARING DAMAGE BILHAN GAMALIEL HARTANTO
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 02 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - MAY -AUGUST 2024
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Abstract

Induction motors, which convert electrical energy into mechanical energy using electromagnetic principles, are widely used in various applications from households to large industries. The performance of these motors is important for the smooth running of industrial production processes. Mechanical damage, such as bearing failure due to overload, can reduce their efficiency. This study aims to monitor and analyze the decrease in induction motor efficiency due to defects in the bearing cageball, using a literature review method. The results show a decrease in efficiency of around 2-3%, which is observed through the efficiency graph against the overall RMS.
DYNAMICS OF IMPLEMENTATION AND ENFORCEMENT OF CODE OF ETHICS AND GUIDELINES FOR JUDGES' CONDUCT FOR MILITARY JUDGES PARLUHUTAN SAGALA; IRMAN PUTRA; ARIEF FAHMI LUBIS
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 03 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - EDITION SEPTEMBER - DECEMBER 2024
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Abstract

It is reasonable to expect good judges to render decisions that uphold the law and demonstrate a sense of justice. The purpose of this study is to demonstrate how, if the Code of Ethics for Guidelines for Judges' Conduct (KEPPH) is followed in carrying out these responsibilities and in other contexts, both directly and indirectly, the perceptions and expectations of justice seekers will ultimately change. restored in the realization of military justice. noble, not cloudy, and free from sinful beliefs and actions. In qualitative research, data were collected methodically, factually, and quickly using descriptive methodology in accordance with the description at the time of the study. The findings of this study indicate that openness, participation, accountability, placing the right person in the right place, and objectivity must be prioritized in the recruitment and selection process to produce competent Military Judges. Although the recruitment and selection process has succeeded in producing Military Judges who uphold the principles of KEPPH and become God's representatives on earth, Military Judges are also human beings and therefore prone to error. Therefore, they require continuous education and training.
THE ROLE OF THE WORLD FOOD PROGRAMME (WFP) IN THE FOOD CRISIS IN CHAD FOR THE PERIOD 2021 - 2023 IMANUELA JUVENTIA MONTOLALU; THEOPHILOS FREEFA BANOKLEX MARIO IMBIRI; TRESIA PERONIKA; YESSY PUTRI NATASYA
INTERNATIONAL JOURNAL OF MULTI SCIENCE Vol. 4 No. 03 (2024): INTERNATIONAL JOURNAL OF MULTISCIENCE - EDITION SEPTEMBER - DECEMBER 2024
Publisher : CV KULTURA DIGITAL MEDIA

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Abstract

This research explores the impact of the World Food Programme (WFP) in addressing the food crisis in Chad from 2021 to 2023. The WFP, as the world's largest humanitarian organization focused on hunger and food security, plays a crucial role in providing food assistance and nutrition programs to millions of vulnerable people in Chad. Despite challenges such as lack of funding and access to conflict-affected areas, WFP's interventions have helped reduce levels of food insecurity. However, to ensure long-term success in creating food security and improving well-being, closer collaboration between government, international organizations, and local communities is essential. A more comprehensive and collaborative approach is needed to address the complex food crisis in Chad effectively.

Page 28 of 32 | Total Record : 313

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