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Basis of strength in concrete
W/C ratio
Admixtures for concrete are
Chemical and Mineral
Concrete achieves ___% of untilate compressive strength in 7 days
65-75
what percentage does the paste represent in the concrete mixture
20-40
A mixture in a freshly harded state, delivered to the site is
Ready Mix Concrete
High Profile Bacthes have components:
above ground level
Whats is the difference between wet-batch plants and dry-batch plants
The Mixer
Liquid advixture dosage is in:
floz/yd3
minimum concrete temprature of concrete mixtures in cold weather is:
50F
Batch plant mixers can be grouped in:
Tilt and horizontal mixers
non-agitating trucks are used for:
short haul projects
10yd3 concrete buckets are helpful for:
high elevation
concrete mictures made a mobil truck mixer is commonly:
Volume based
Common concrete barrel size in NJ is:
4-12 yd3
production, delivery and placecmnt of ready mix concrete is based on:
ASTM C-94
Scale that has a counter weight
Scale Lever
Scale that is electronic
Single Load
Scale that has no moving parts
Four Point
In batching, Cement should be weighed:
First
In batching Pozzolans should be batched:
Second
water batching can be done by:
Volume and Weight
loading method which blends fine and coarse and cememt before
Ribbon Batching
Loading method where trucks get aggregate, water and admixtures; thenthey move to the next station to get the cement
Dry Batching
