-
-
-
-
-
-
-
-
-
-
-
There is a dime-sized hole about a 1/4-inch-deep in a driveway I poured recently that doesn't want to set up. It has been this way for several days now. I've been pouring concrete for 15 years and have never seen anything like this. What is it?
-
Is there a quick test to detect the presence of iron sulfide in aggregates? The aggregate I am considering will be used in an exposed decorative application, so repeated wetting and drying of the aggregate will occur at the surface. I also am concerned it may cause staining.
-
We watched a concrete pour where concrete was revibrated after it had set up. The vibrator head did not "readily penetrate" the concrete as described in ACI 309. In fact the inspector said "it took 15 to 30 seconds of vibrating at each pass for the probe to enter the older concrete." The "older"...