Abstract

The Industrialized Building System (IBS) was introduced in Malaysia in 1966, but it failed to establish itself on a continuous basis though there has been a sustained large market for residential projects even since. One of the reasons behind this shortcoming is the lack of scientific data on labor productivity that could convince policy maker. Hence, the objective of this study is to develop a standardized data collection methodology for measuring and comparing the conventional building system and IBS in term of labor productivity, crew size and cycle time. Labor productivity (man hours/m2) is defined as the man hours required to complete the structural element of one unit house. A total of 499 data points were obtained from seven residential projects constructed between January 2003 and April 2004. Analysis of Variance (ANOVA) indicated that the labor productivity was significantly different between four structural building systems. The mean labor productivity for the conventional building system was 4.20 man hours/m2 followed by cast in-situ table form (2.70 man hours/m2), cast in-situ half tunnel form (1.88 man hours/m2) and pre-cast concrete system (1.33 man hours/m2). Further, the analysis of crew size indicated that the mean crew size of a conventional building system of 24 workers was significantly different from the IBS of 22 workers. However, the crew size within the IBS was found to be insignificant. The cycle time measured in days per house was found to be significantly different between structural building systems with the conventional building system of 4.9 days, cast in-situ table form of 3.9 days, cast in-situ half tunnel form of 2.9 days and pre-cast concrete system for 2.3 days. The labor productivity obtained from this study could be used as a preliminary guideline for a client or consultant to identify the most appropriate building system for executing a construction project and determining the labor requirement in the construction industry.

Highlights

  • Eighth Malaysia Plan (2001-2005) whereby 600,000 to800,000 houses are expected to be built.Construction labor productivity represents one of the core elements in the construction industry

  • Analysis of variance (ANOVA) results indicated that the mean crew size were not equal as shown in Table 10, [Analysis of Variance (ANOVA) output, F (3,498) = 7.767, P-value = 0.000]

  • The conventional building system required 26% more cycle time than cast in-situ table form system, 41% of cast in-situ half tunnel form system, 0.282 for all building systems in total

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Summary

INTRODUCTION

800,000 houses are expected to be built. Construction labor productivity represents one of the core elements in the construction industry. It was mentioned that an IBS in particular interest of their users or producers Such the construction industry includes the industrialized classification uses construction technology as a basis process whereby the components of a building are for classifying different building systems. The cast concrete as their main structural and space software elements include system design, which is a enclosing materials These systems can further be complex process of studying the requirement of the end classified according to the geometrical configuration of user, market analysis, development of standardized their main framing components as linear or skeleton components, establishment of manufacturing and (beams and columns) system, planar or panel systems assembly layout and process, allocation of resources and three dimensional or box systems.

Objective
AND DISCUSSION
A Pearson correlation was carried out to determine
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