The Evaluation of Construction Dust Diffusion and Sedimentation Using Wind Tunnel Experiment

Area of Science:

• Environmental Science
• Civil Engineering
• Atmospheric Science

Background:

• Construction projects generate substantial particulate matter, negatively impacting air quality and the environment.
• Understanding the behavior of construction dust is crucial for developing effective mitigation strategies.

Purpose of the Study:

• To investigate the concentration, distribution, and diffusion of construction dust with varying moisture contents.
• To analyze the effects of wind speed and moisture content on dust inhibition, drifting distance, and suppression percentage.

Main Methods:

• Conducted wind tunnel experiments to simulate dust dispersion under controlled conditions.
• Varied moisture content (1%, 2%, 3%) and wind speeds to assess their impact on particulate matter behavior.

Main Results:

• Peak particulate matter concentration decreased significantly with increased moisture content (up to 65.38% reduction for 3% moisture).
• Drifting distance of dust dramatically reduced with higher moisture content; a 5 m/s wind speed showed a reduction from 641.58 km (dry) to 3.82 km (3% moisture).
• Higher moisture content increased particle inhibition rates and reduced average concentrations.

Conclusions:

• Increasing dust moisture content is an effective dust suppression method, particularly at low to medium wind velocities.
• Specific wind velocity restrictions are recommended based on moisture content to maintain particle suppression rates above 70% within 50 meters.