Concrete mixing, curing, and basic masonry techniques and tools used in construction trades.
29 cards · basic cards · AI-written, checked twice. Edit anything.
- What are the three main components of concrete?
Show answer
Cement, aggregates (sand and gravel), and water.- What is the standard concrete mix ratio by weight?
Show answer
1 part cement, 2 parts fine aggregate, 3 parts coarse aggregate, 0.5 parts water.- What is the primary role of water in concrete mixing?
Show answer
It activates the cement and provides workability for placement and finishing.- What are the two types of aggregates in concrete?
Show answer
Fine aggregate (sand) and coarse aggregate (gravel or crushed stone).- Define concrete curing.
Show answer
The process of keeping concrete moist and at proper temperature so it hardens and gains strength.- What is the minimum curing time for concrete to reach approximately 70 percent of final strength?
Show answer
Seven days of proper curing.- How does cold weather affect concrete curing?
Show answer
It slows hydration, requiring longer curing times and sometimes protective coverings.- What is the key difference between mortar and concrete?
Show answer
Mortar lacks coarse aggregate and is used to bond bricks, while concrete includes coarse aggregate for structural strength.- What is running bond in masonry?
Show answer
A brick laying pattern where each brick is offset from the one below, with the long side (stretcher) showing horizontally.- Name three types of mortar joint profiles in masonry.
Show answer
Flush, concave, and convex are common options, with others including struck, raked, and weathered.- What is pointing in masonry?
Show answer
Filling or refilling mortar joints in existing brickwork, usually for repair or aesthetic purposes.- What is efflorescence on masonry surfaces?
Show answer
White crystalline deposits (salts) that appear on bricks or mortar as water evaporates.- What is rebar and why is it used in concrete?
Show answer
Steel reinforcement bars placed inside concrete to increase tensile strength and prevent cracking.- Why is proper spacing important when laying rebar in concrete?
Show answer
It ensures concrete can fully surround the rebar (cover) for protection and proper bonding.- What does a slump test measure?
Show answer
The vertical drop of freshly mixed concrete poured into a cone, which indicates consistency and workability.
FlashKeepers