Comparative Analysis of Concrete Formwork Productivity Influence Factors

摘要

Concrete formwork labor costs constitute over 1/3 of total concrete constructioncosts. The factors which most influence formwork productivity must be identified and their impact quantified to improve productivity and provide accurate forecasting. Productivity was defined as workhours per 100 square feet of form area in contact with concrete. The thesis scope was limited to wall and column formwork. An extensive literature search found factors which significantly impact productivity to include repetition, weather events, sequencing, and material management. A productivity influence factor PIF was defined as the productivity rate impacted by a specific factor divided by the non-impacted rate. A comprehensive quantitative list of influencing factors was compiled. Four local projects were studied to compare the influence of various factors. Data collection methods were adapted from a recent productivity data collection manual PDCM. Improvements to PDCM procedures were suggested. Data from the projects were analyzed and compared to PIF values from other sources. Several factors were within 10% of the literature values, while others varied widely based on the impacted area. New factors such as footing elevation changes and piecework were identified.