Leaving a small unfloated section and waiting for bleed water helps determine if the magnesium bull float is what?

Leaving a small unfloated section and waiting for bleed water helps determine if the magnesium bull float is what?

• A. Sealing
• B. Smoothing
• C. Polishing
• D. Cleaning

Answer: (A)

The test is about whether the magnesium bull float is sealing the surface. Magnesium floats can press fines into the tiny pores of the concrete, tightening the top layer and reducing how much bleed water can rise to the surface. By leaving a small unfloated patch, you create a control area to watch for bleed water. If, after waiting a bit, little or no bleed water appears on that patched area, it’s a sign the float is sealing the surface. If bleed water continues to come up in that patch, the surface isn’t being sealed yet by the float. So this check helps you assess sealing, not smoothing, polishing, or cleaning.

The test is about whether the magnesium bull float is sealing the surface. Magnesium floats can press fines into the tiny pores of the concrete, tightening the top layer and reducing how much bleed water can rise to the surface. By leaving a small unfloated patch, you create a control area to watch for bleed water. If, after waiting a bit, little or no bleed water appears on that patched area, it’s a sign the float is sealing the surface. If bleed water continues to come up in that patch, the surface isn’t being sealed yet by the float. So this check helps you assess sealing, not smoothing, polishing, or cleaning.