16 Questions
When was concrete first widely used in construction?
Around 20 B.C.
What does the word 'concrete' derive from?
Roman concretus
Which book provides information on building construction principles, materials, and systems?
Building construction: Principles, Materials, and Systems
In which book can information about various tools be found?
Tools: The Ultimate Guide - 500+ Tools
What does a zero slump in concrete indicate?
Low water-cement ratio
What does a collapsed slump in concrete suggest?
High water-cement ratio
When should concrete with shear slump be retested?
If the mix lacks cohesion
What is the recommended composition for a cylindrical concrete specimen with coarse aggregate more than 5 cm in diameter?
Diameter equal to the maximum aggregate size and height double its diameter
What is the purpose of including air-entraining or water-reducing admixtures in a low water-cement ratio mix?
To improve the workability
What is the primary reason for keeping the top surfaces of concrete moist after casting?
To protect against dehydration
Why is concrete normally considered fully cured after 28 days?
Due to practical purposes
What is the purpose of a curing compound when applied to concrete surfaces?
To seal against moisture loss
What is the purpose of concrete curing?
To maintain moisture in the concrete surface
How does water curing help in concrete construction?
By avoiding evaporation of water from the concrete surface
What happens if the core temperature of concrete rises beyond 70 celsius?
It increases the risk of concrete cracking
Why is it important to maintain a temperature gradient in concrete curing?
To prevent cracking due to temperature differences
Explore the compressive strength of concrete at different ages including 1 day, 3 days, 7 days, 14 days, and 28 days. Learn about the importance of concrete curing in maintaining properties like strength, permeability, and durability by preventing water evaporation during the hardening process.
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