quiz week 4 three

Question 1

. Hazard of extended exposure to wet concrete while placing and proper clothing and PPE.

Answer 1

Employees should wear full-length trousers, long-sleeve shirts, rubber boots, and gloves and avoid prolonged contact with concrete. Employees exposed to concrete splatter should wear eye protection. Washing facilities and eyewash solution should be provided.

Question 2

Hazards of silica exposure and methods of prevention including PPE.

Answer 2

Employees should wear NIOSH approved mask, and use a wet saw to prevent Silica exposure.

Question 3

Safety factors for precast and lift slab concrete erection

Answer 3

1. Tilt up inserts must have 2/1.
2. Precast inserts must have 4/1.
3. All lifting hardware must have 5/1.

Question 4

Lift-slab construction operations

Answer 4

1. Jacks must be marked with rated capacity
2. Jacks have to have 2.5/I Safety factor.
3. Jacks have to have safety devices in case of failure.
4. Lifting operations to be supervised by a competent person.
5. Slab must be kept within operations.
6. Welding to be done by certified welder

Question 5

Limited Access Zone

Answer 5

Established prior to start of work for all walls over 8 feet. Walls 8 feet and less, do not have establish zone if adequately braced. Equal to the height of wall + 4’ and run full length of wall. Establish on non-scaffolded side of wall. Access restricted to only those employees constructing wall.

Question 6

Wind effect on unsupported masonry walls

Answer 6

1. Restricted zone to be evacuated during initial
   period when wind speeds exceed 20 mph
2. Restricted zone to be evacuated during the
   intermediate period when wind speeds exceed 35
   mph

Question 7

Hazards of high rise concrete construction

Answer 7

(debris, falling, flying deck form collapse)