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All Journal Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan International Journal of Civil Engineering and Infrastructure (IJCEI)
Hikma Dewita
Tama Jagakarsa University
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Effect of Adding Fly Ash and Rice Husk Ash on Compressive Strength to Meet the fc'35 MPa Concrete Quality Mardiaman Mardiaman; Hikma Dewita
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 7, No 1 (2022): March
Publisher : Litbang Pemas - Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v7i1.778

Abstract

Portland cement usage has increased, leading to substitute materials being sought. The composition of the concrete mix material affects its strength. Concrete compressive strength is usually determined in 7, 14, 21 and 28 days. This study determined the compressive strength of concrete at variations of 28, 35, 42 and 49 days. The attained compressive design strength was fc'35 MPa from the variation of the mixed materials. The compressive test results based on the variation were above fc'35 MPa. The two substitute materials meet the strength requirements. The addition of fly ash and rice husk ash decreased the compressive strength of concrete at 28 days. The compressive strength of regular concrete and with additional materials is more than 35 MPa. Adding fly ash and rice husk ash by 20% still resulted in the compressive strength of concrete above 35 MPa, namely 36.78 MPa and 35.04 MPa.
CONTROL OF SCHOOL FACILITIES AND INFRASTRUCTURE PROJECTS OF OGAN KOMERING ILIR REGENCY AND OGAN ILIR REGENCY Handa Dwi Sanrach; Hikma Dewita; Kristina Sembiring; Pio Ranap Tua Nabiho
International Journal of Civil Engineering and Infrastructure Vol. 3 No. 2 (2023): IJCEI Volume 3 No. 2
Publisher : University Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/ijcei.3.2.21-30

Abstract

The project and school infrastructure of Ogan Komering Ilir Regency and Ogan Ilir Regency aims to determine project performance. The analysis was carried out based on completed projects in the aspects of time and cost control using the Earned Value Analysis concept which consists of three indicators, namely BCWS, BCWP and ACWP. The analysis was carried out on time deviations (SV), cost deviations (CV), total budget deviations (BV) and was carried out in weeks (21 weeks). From this deviation analysis, productivity and project performance can be analyzed again, such as the time performance index (SPI) and Cost Performance Index (CPI). Based on Earned Value analysis, the schedule deviation (SV) on the project is 0. This means that in Week 21 the heavy work carried out was completed according to plan. Apart from that, the time performance index on the project is 1 (implementation completed according to schedule), while the cost performance index is 1.03 (1.3 > 1 which means expenditure is lower than planned).
Co-Authors Handa Dwi Sanrach Kristina Sembiring Mardiaman Mardiaman Pio Ranap Tua Nabiho