Concrete and Masonry Construction questions for the CHST

Question 1

A contractor wants to stage pallets of masonry block on a newly placed elevated concrete slab to save crane time. The superintendent says the slab has been curing for a week and looks fine. What must occur before the loads are placed on the slab?

1. AThe loads may be placed once the slab has cured for seven days, as long as the pallets are spread evenly
2. BThe block supplier must certify the weight of each pallet, after which the slab may be loaded
3. CThe competent person on site must visually inspect the slab and confirm that no cracking is visible
4. DThe employer must determine, based on information from a person qualified in structural design, that the slab can support the loads

Question 2

During a post-tensioning operation on an elevated slab, a laborer who is not part of the stressing crew asks to stand directly behind the jack to watch the tensioning. Which response complies with the standard?

1. AAllow it if a spotter is assigned to watch the laborer
2. BDeny it, because only employees essential to the post-tensioning operations may be behind the jack during tensioning
3. CAllow it if the laborer stands behind the jack only during the first half of the tensioning
4. DAllow it if the laborer wears a hard hat and face shield

Question 3

A concrete contractor has stacked single post shores in two tiers to support a deck form. During the pre-pour walkthrough, the site safety technician finds the following: the design was prepared by a qualified designer, the posts in both tiers are vertically aligned, and the splices are made so the posts cannot shift out of alignment. Bracing at the splice level exists in only one direction, and the individual tiers have no diagonal bracing. Which deficiency must be corrected before concrete is placed?

1. AThe splices must be removed because tiered single post shores may not be spliced
2. BThe shores need diagonal bracing in the top tier only, since the lower tier is supported by the slab below
3. CThe vertical alignment of the posts must be replaced with a horizontally staggered arrangement so loads spread across the tiers
4. DThe shores need bracing in two mutually perpendicular directions at the splice level, and each tier must also be diagonally braced in those same two directions