抄録
Researchers and site engineers in construction have tried to develop appropriate methods of productivity measurements. Even though many methods have been released in academia and industry, they seldom are able to select the optimized method while considering various site conditions. This study was developed from a previous study which presented the quantified productivity differences on one specific operation, that of the conventional earthmoving operation. This study suggested more consistent results for productivity differences by various methods while focusing on two different operations; the conventional and the GPS-based system. This study verified the findings from a previous study whereby results from a deterministic method and an actual measurement yield the highest values and the lowest values, respectively. It was also found that the quantified differences were mostly within 10% of the range of productivity loss in the deterministic measurement, which was illustrated in the literature. Additional statistical verification showed that the differences were mostly within 95% of the confidence intervals. It is expected that this study will provide researchers in academia with basic guidelines for developing appropriate methods for performance measurements. This study also assists site engineers in the construction industry to predict productivity and to convert results to more realistic values by using methods other than actual measurements.
