Despite studies exploring potential applications of unmanned aerial systems (UASs), the particular use and value of visual assets (photographs or video) collected with UASs for construction management tasks is not well understood. This paper presents an exploratory case study to identify potential applications of visual assets obtained from UASs for construction management tasks. The case study involved the development of a visual assets database from UAS-based images and videos collected during UAS flights at jobsites in the United States and Brazil as well as semi-structured interviews with construction project personnel. The results revealed potential applications of UASs mainly for project progress monitoring, job site logistics, evaluating safety conditions, and quality inspections among other secondary management tasks. In addition, an analysis of costs related to the use of UASs was performed. The main contribution of this case study is a better understanding of the use of UASs for construc...

Benchmarking is a systematic process of measuring and comparing an organization’s performance against that of other similar organizations in key business activities. The lessons learned from other companies can be used to establish improvement targets and to promote changes in the organization. The benchmarking process can create a fertile ground for ideas, but only in a receptive environment; companies that share good practices and compare their performance against others benefit most. Recently, industry groups in several different countries have initiated benchmarking programs focused mainly on construction performance measures. This paper describes the scope of these initiatives and discusses the lessons learned and improvement opportunities that were identified in their design and implementation. This investigation is focused on four initiatives, carried out in Brazil, Chile, the United Kingdom, and the United States. This paper concludes by recommending some further directions on this research topic.

The identification and characterization of particulate matter (PM) concentrations from construction site activities pose major challenges due to the diverse characteristics related to different aspects, such as concentration, particle size and particle composition. Moreover, the characterization of particulate matter is influenced by meteorological conditions, including temperature, humidity, rainfall and wind speed. This paper is part of a broader investigation that aims to develop a methodology for assessing the environmental impacts caused by the PM emissions that arise from construction activities. The objective of this paper is to identify and characterize the PM emissions on a construction site with different aerodynamic diameters (PM2.5, PM10, total suspended particulates (TSP)), based on an exploratory study. Initially, a protocol was developed to standardize the construction site selection criteria, laboratory procedures, field sample collection and laboratory analysis. This protocol was applied on a multifamily residential building construction site during three different construction phases (earthworks, superstructure and finishings) aimed at measuring and monitoring PM concentrations arising from construction activities. The particulate matter was characterized in different particle sizes. Results showed that the higher TSP emissions arising from construction activities provoked environmental impacts. Some limitations to the results were identified, especially with regards the need for a detailed investigation about the influence of different construction phases on PM emissions. The findings provided significant knowledge about various situations, serving as a basis for improving the existing methodology for particulate material collection on construction sites and the development of future studies on the specific construction site phases.

Purpose: The purpose of this paper is to present an exploratory study in order to understand the contributions of the resilience engineering (RE) concept and the use of unmanned aerial systems (UASs) technology to support the safety planning and control (SPC) process. Design/methodology/approach: A case study on a construction project was conducted and involved the following steps: diagnosis of the SPC process; development of a safety monitoring protocol using UASs; and field tests to monitor safety performance using UASs and data analysis. Findings: In terms of its theoretical contribution, this work presents a conceptual framework explaining how the RE and the UASs can contribute to the SPC process. Also, this paper provides, as a practical contribution, a protocol for safety monitoring with UASs integrated into the safety routine, highlighting the tasks that can be checked and unsafe conditions and safety/production conflicts identified through monitoring. Practical implications: This study can be used to support and stimulate the construction managers who wish to adopt the RE concepts and UAS technology to improve safety management. Social implications: An efficient SPC process can improve the work conditions at construction sites, contributing with the reduction of accidents rates. Originality/value: The paper highlights the need to adopt new approaches, as RE concepts and UAS technology to support the SPC process, in order to improve safety conditions at construction sites.