Article Per Year (5 Year)
p-Index From 2020 - 2025
0.408
P-Index
This Author published in this journals
All Journal Pandawa : Pusat Publikasi Hasil Pengabdian Masyarakat Jurnal Sipil Terapan
Yelfidar Yelfidar
Unknown Affiliation
Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Law, Crime, Criminology & Criminal Justice Public Health Other

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Pengaruh Penambahan Abu Batu Terhadap Mix Design Campuran Beton Program Studi Teknik Sipil, Institut K-225 Mhd Almahi; Yelfidar Yelfidar; Syaiful Hendri Rawi
Jurnal Sipil Terapan Vol. 1 No. 1 (2023): Mei: Jurnal Sipil Terapan
Publisher : Fakultas Teknik Universitas Cenderawasih

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58169/jusit.v1i1.177

Abstract

Basically, the ingredients for forming concrete consist of cement, water, and aggregate, namely fine aggregate and coarse aggregate. The aggregates commonly used are natural aggregates, namely sand as fine aggregate and gravel or crushed stone as coarse aggregate. Sand as fine aggregate is obtained from mining processes in nature, especially in Indragiri Hulu district, sand mining occurs almost along the Indragiri river. Rock ash is generally dark in color (blackish gray), and consists of fairly coarse grains. When compared to sand, rock ash has a cheaper price. The method used in this study is the experimental method, namely research that aims to investigate causal relationships between one another and compare the results so as to make an innovation. The results of the tests that have been carried out by the author on variations in the addition of stone ash to the concrete mixture for fine aggregate with variations of 25%, 50% and 75%. The results of laboratory tests in this study found that the optimum percentage of rock ash as a substitute for sand was a variation of 50% rock ash with a compressive strength of 28 days of 19.60 Mpa. Rock ash on 50% test specimen can be used as a substitute for sand because in terms of compressive strength with the quality provisions K-225 meets the requirements with a value of 19.60 MPa.
Pelatihan Pengetahuan Dan Keterampilan Menggunakan Alat Ukur Waterpass Untuk Peningkatan Kompetensi Siswa Kelas X Jurusan Teknik Konstruksi dan Perumahan SMKN 1 Rengat Barat Kabupaten Indragiri Hulu Nedra Neswita; Sahriyal Sahriyal; Sri Agustin; Arif Sudaryanto; Bobby Mauliantino; Yelfidar Yelfidar
Pandawa : Pusat Publikasi Hasil Pengabdian Masyarakat Vol. 1 No. 3 (2023): Juli : Pandawa : Pusat Publikasi Hasil Pengabdian Masyarakat
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/pandawa.v1i3.67

Abstract

The purpose of this community service activity is to train and guide the skills of students of West Rengat 1 Vocational School in an effort to increase competence in knowledge, skills and processing of measurement data using a waterpass measuring instrument in soil surveying subjects, because one of the competencies that must be possessed SMK students, especially those majoring in construction and housing engineering, are studying land surveying using a waterpass tool. The methods used in this training activity include presentation, demonstration, practice and evaluation. The results of the evaluation of this activity were obtained from the assignments given to each student. The instructor checks the calculated measurement results. From the initial observation to the final evaluation process, it was found that there was an increase in the knowledge and skills of the students. Initially the participants did not have the ability to do surveying using a waterpass, but after the training was given the participants were able to apply the program. The evaluation results showed that as many as 67% of the participants were able to carry out the measurement assignments that had been given.
Co-Authors Arif Sudaryanto Bobby Mauliantino Mhd Almahi Neswita, Nedra Sahriyal Sahriyal Sri Agustin Syaiful Hendri Rawi