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 A: Spray with water immediately after finishing
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 B: Cover with plastic sheeting immediately
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.
Option D: Allow to air dry naturally
Allowing concrete to air dry naturally in hot weather above 90°F will cause rapid moisture loss, leading to surface cracking, reduced strength, and poor durability. Hot weather requires active moisture retention, not passive drying.
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?
A detail drawing shows a scale of 3/4" = 1'-0". If a dimension measures 2.25 inches on the drawing, what is the actual dimension?
What is the maximum recommended spacing between drywall screws when attaching to wood studs?
People Also Study
Business & Financial Management
120 questions · 70% to pass
Contract Administration
60 questions · 70% to pass