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All Journal IJIEEB : International Journal of Integrated Education, Engineering and Business Journal of Applied Science, Engineering, Technology, and Education
Sumiyati Sumiyati
Faculty of Administration, University Mercu Buana Jakarta, Indonesia
Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Social Sciences Other

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Comparation Study of The Use Naftalena From Coal Tar Waste with Camper Naphtalene As Concrete Admixture Sumarno Agung; Syafwandi Syafwandi; Adelia Rizky Fatmawati; Sumiyati Sumiyati
Journal of Applied Science, Engineering, Technology, and Education Vol. 2 No. 2 (2020)
Publisher : Yayasan Ahmar Cendekia Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (846.051 KB) | DOI: 10.35877/454RI.asci2160

Abstract

Concrete is a mixture of Portland cement or other hydraulic cement, fine aggregate, coarse aggregate, and water, with or without additives (admixture). The naphthalene superplasticizer used comes from the distillation of coal tar and a little from the rest of petroleum, but there is also camphor naphthalene. Where camphor grains contain 250-500 mg of naphthalene. Naphthalene is mostly produced from coal tar distillation, and a little from the rest of the fractionation of petroleum, by the molecular formula (C10H8) and in the form of two unified benzene rings. This compound is volatile, volatile even in the form of solids. The vapor produced is flammable. The purpose of this study was to determine the effect of the use of naphthalene from coal tar waste with camphor naphthalene as concrete admixture, and determine the effect of naphthalene from coal tar waste with camphor naphthalene on concrete toughness, density, water absorption, of concrete compressive strength. It is expected that the use of naphthalene can reduce the use of cement, and reduce water use. But it does not reduce the strength of the concrete so as to reduce costs in making concrete. The variations in the use of camphor naphthalene and coal tar naphthalene are 20%, 30%, 40%.
Analysis of Jakarta’s Mass Rapid Transit Infrastructure Services on Passenger Satisfaction Performance With The Influence of The Covid 19 Virus Sunandar Ali; Mukhlisoh Mukhlisoh; Sumiyati Sumiyati
IJESEMS : International Journal of Engineering Science Educatioon and Management System Vol 4 No 1 (2021): March 2021
Publisher : LPPM NAROTAMA UNIVERSITY, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29138/ijieeb.v4i2.1346

Abstract

Service quality is a strategy that is very important for the development and success of business organizations. The purpose of this study is to analyze the dominant variables in MRT Jakarta infrastructure services on customer satisfaction performance and to find solutions to the dominant variables found. The hypothesis of this research is whether or not there is an effect of MRT Jakarta infrastructure services on customer satisfaction performance with the Covid 19 pandemic. The results obtained through the analysis of the Customer Satisfaction Index (CSI) were 85.38% and stated that customers were very satisfied with the MRT Jakarta services provided. In the Importance Performance Index (IPA) analysis with a Cartesian diagram, there are three dominant variables of MRT Jakarta services on customer satisfaction performance. Judging from the level of performance and importance of the quality of MRT Jakarta services, on average, it is good, so that the MRT Jakarta management must prioritize several variables to be improved and maintain those variables that are considered to be in accordance with customer expectations.
Co-Authors Adelia Rizky Fatmawati Mukhlisoh Mukhlisoh Sumarno Agung Sunandar Ali Syafwandi Syafwandi