Silica fume is often mixed into concrete for strength. It is a fine powder and can easily become suspended in the air du

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Silica Fume Is Often Mixed Into Concrete For Strength It Is A Fine Powder And Can Easily Become Suspended In The Air Du 1 (216.06 KiB) Viewed 39 times

Silica fume is often mixed into concrete for strength. It is a fine powder and can easily become suspended in the air during mixing as PM 2.5. Wind (direction is from source to receptor) speed at 1 m from ground level is 2.5 m/s. The PM 2.5 concentration in the wind blowing towards the source is 15 ug/m3. The atmospheric stability class is B. The two emission sources are identical, each with emission rate of 0.5 g/s and an effective height (h+Ah) of 10m. Assume rural area. Estimate the PM 2.5 concentration at the receptor, which is at ground level in g/m3). (Non-anonymous question o) (15 Points) 150 X Receptor O Source 100 Cross-wind distance (m) 50 * o -50 0 50 100 150 200 250 300 350 400 450 500 Down-wind distance (m)