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All Journal Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Jurnal Teknik Sipil Cendekia (JTSC)
Fitriana Sarifah
Siliwangi University
Civil Engineering, Building, Construction & Architecture

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Productivity Analysis Of Lightweight Concrete Block Wall Installation Using Time Study Method On Building X Project In Tasikmalaya Hidayanto; Shanti Astri Noviani; Galih Rahmat Jatnika; Fitriana Sarifah
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 11 No 2 (2026): SEPTEMBER
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v11i2.1761

Abstract

Labor productivity strongly impacts construction time and cost. While standard metrics like the PUPR Work Unit Price Analysis (AHSP) are widely used, actual field productivity often deviates due to specific site conditions and labor dynamics. This discrepancy necessitates localized empirical evaluation. Thus, this study analyzes lightweight concrete block wall installation productivity at Building X Project, Tasikmalaya, using the time study method. Field observations over three days involved one crew (one mason, two helpers). Data were collected using stopwatches and video recordings. The results showed that the average actual field productivity reached 12.20 m²/day, significantly surpassing the national AHSP standard of 7.69 m²/day, demonstrating that job-site performance can substantially exceed established national theoretical productivity benchmarks.  Field labor coefficients were highly efficient at 0.082 OH/m² (mason) and 0.164 OH/m² (helpers). Time allocation analysis showed that the mason focused primarily on productive installation activities, while the two helpers exclusively performed supporting tasks such as material transport, block cutting, and mortar mixing, thereby maximizing overall work efficiency. These findings demonstrate that an efficient labor composition and clear task division can substantially improve productivity beyond applicable AHSP standards.
Analysis of the Effects of Soil Parameters and Depth on the Lateral Movement of Soil Improved by Combined PVD-Vacuum Consolidation Fitriana Sarifah; Intan Nuriskha Rachma; Sarah Oktaviani Dewi; Pengki Irawan; Shanti Astri Noviani
JURNAL TEKNIK SIPIL CENDEKIA (JTSC) Vol 7 No 4 (2026): October
Publisher : Departement of Civil Engineering, Universitas Winaya Mukti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51988/jtsc.v7i4.744

Abstract

One method for improving highly compressible, low-permeability soft soils is the combination of Prefabricated Vertical Drains (PVDs) and vacuum consolidation. Chai et al. (2005) proposed an analytical method for estimating lateral soil movement based on field measurements using inclinometers. However, the model parameter (?) in their method lacks an explicit explanation of its relationship with soil properties and depth. This study aims to investigate the influence of soil parameters and depth on lateral ground displacement by comparing inclinometer measurements from a case study with an enhanced analytical model derived from Chai et al. (2005). The results identify the compression index (Cc) as the most influential soil parameter, while the depth effect (z) is represented by the function f(z) = 0.001z3 - 0.0317z2 + 0.2328z + 0.3345. The proposed model was evaluated against field data using quantitative error metrics, yielding a coefficient of determination (R2) of 0.9710, a mean absolute error (MAE) of 0.0435, and a root mean square error (RMSE) of 0.0482. These results indicate strong agreement with field measurements and relatively low prediction errors. Nevertheless, further validation under different soil conditions is required to establish the model's broader applicability.
Co-Authors Galih Rahmat Jatnika Hidayanto Intan Nuriskha Rachma Pengki Irawan Sarah Oktaviani Dewi Shanti Astri Noviani