What is the proper procedure for curing concrete in hot weather conditions above 90°F?
Correct Answer
C) Keep moist and shaded for extended period
Hot weather concrete curing requires keeping the surface moist and protected from direct sunlight for an extended period. This prevents rapid moisture loss that can cause cracking and reduced strength development.
Why This Is the Correct Answer
Hot weather concrete curing requires keeping the surface moist and shaded for an extended period to prevent rapid moisture loss. High temperatures above 90°F accelerate evaporation, which can cause surface cracking, reduced strength development, and poor durability. Maintaining moisture and shade allows proper hydration of cement particles and prevents thermal shock. The extended curing period compensates for the accelerated chemical reactions in hot conditions.
Why the Other Options Are Wrong
Option B: Allow to air dry naturally
Spraying with water immediately after finishing can damage the surface texture and cause scaling or dusting. The concrete surface needs time to achieve initial set before water application, and immediate spraying can wash away cement paste from the surface.
Option D: Spray with water immediately after finishing
Covering with plastic sheeting immediately after finishing can trap bleed water on the surface, creating a weak layer and potential delamination. Plastic should only be applied after the concrete has achieved initial set and surface bleeding has stopped.
Memory Technique
Use 'MOIST & SHADE' - Moisture Over Initial Set Time & Shade Helps Avoid Damage in Extreme heat
Reference Hint
ACI 305 Hot Weather Concreting or Florida Building Code Chapter 19 - Concrete
More Project Mgmt Questions
What is the minimum R-value required for wall insulation in Florida Climate Zone 2?
A subcontractor brings a new chemical product to your jobsite. Under the Globally Harmonized System (GHS), what information must be immediately available to workers?
A construction site has a trench that is 8 feet deep in Type B soil. What is the maximum allowable slope ratio for the trench walls without protective systems?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
Your crew discovers suspected asbestos-containing materials during a renovation project. What is the first action you should take?
A scaffold platform is 12 feet long and 5 feet wide. If the maximum load capacity is 25 pounds per square foot, what is the total weight capacity of this platform?
Which CSI MasterFormat Division would contain specifications for fire-stopping and firesafing materials?
In tilt-up concrete construction, what is the primary advantage of this method over conventional cast-in-place construction?
Which OSHA standard specifically addresses construction industry safety and health regulations?
A structural drawing shows a beam labeled 'W12x26'. What does the '26' represent?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass