Investigating Blasting Demolition Dust Micromorphology, Microscopic Agglomeration Process With Wetting Droplet and Suppression Effectiveness by Explosion Water Mist

Blasting demolition has been widely used in the safe and efficient demolishing of construction buildings. dust is most visible realistic harmful material during blasting process. The characteristics suppression are scarcely addressed literature. This article investigated micromorphology characteristic from a typical building project. median size value D50 was 65.890 ?m, it showed character smooth edge, fluffy structure, cracks. It consists higher content heavy metals than conventional cement powder particles, which include Mn, Ni, Zn, As elements. cannot be wet by municipal water for its hydrophobic character. A novelty method proposed to set methodology form stable, larger volume, surface area droplet on rod stand, provided more opportunities find out verify microscopic agglomeration phenomenon effectiveness between different wetting droplets. single dust-droplet collision results can accurately recorded high-speed camera with microscope, submergence time particle stand 2 ms, while 1.125 ms surfactant solution droplet, much shorter water. were shown that better agglomerated solution. In projects, BDD methods explosion mist have highest efficiency, restrict BDD’s concentration 10 mg/m 3 .