Concrete Block Presentation
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Transcript of Concrete Block Presentation
8/13/2019 Concrete Block Presentation
http://slidepdf.com/reader/full/concrete-block-presentation 1/22
Concrete Masonry UnitsBasic TrainingConcrete Block 101
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Concrete Masonry Units are manufactured using
the following ingredients:
• Portland Cement• Normal Weight Aggregates
• Light Weight Aggregates
• Admixtures
• Water
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Portland Cement
Cement gives theblock its strength
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Normal Weight Aggregates
May consist of any
of these materials:
• Sand
• Gravel• Marble Chips
• Used as fillers in
the block
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Light Weight Aggregates
• Increases firerating
• Makes block
lighter • Made from
expanded clay
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Admixtures
Added to the mixduring production
Increase water
repellency
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Water
Water is added in
various proportions
depending on the
mix design
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The Manufacturing ProcessHow is concrete block
manufactured?
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Raw Materials
Raw materials areweighed out in
proportions and
transported viaconveyor to the
mixer.
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Mixer
All raw materials
are mixed for 7
minutes.
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Block Machine
From the mixer thematerials enter the
block machine.
They fall into amold and are
vibrated for 7
seconds.
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Mold Removal
After the mold isremoved the block
are able to stand by
themselves. They
are not hard
however. You
could grab a chunk
out of the block.
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Kilns
Block remain in thekilns for 24 hours.
They are baked in
a moist steam heat
at 140 degrees
Fahrenheit.
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Concrete Masonry Units
Concrete masonry units are
manufactured in several types:
• Grey Block• Split Face
• Split Rib
• Concrete Brick
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Grey Block
Manufactured in the
following sizes:
4”
6”
8”
10”12”
Regular Concrete Block
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CMU Dimensions
H e i g h t
W i d
t h
Length
Dimensions for CMU
expressed as:
Width x Height x Length
4 x 8 x 16
6 x 8 x 168 x 8 x 16 or 7-5/8 x 7-5/8 x 15-5/810 x 8 x 1612 x 8 x 16
Nominal Actual / Standard / Specified
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runningbond
Nominal dimensions are equal to the standard dimensions
plus the thickness of one mortar joint (typically 3/8 in.)
7-5/8 8 in.
15-5/8
16 in.
Nominal Dimensions
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Split Face
• Manufactured inpairs
• Available with a
single score
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Machine Split
Split face block are
split from the top,
bottom, and both
sides.
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Split-Face Concrete MasonrySplit-Face Concrete Masonry
Unit that is cracked under pressure to expose
the inner matrix of the concrete masonry.
Siamese Unit is
Mechanically
cracked underpressure
Unit are then
separated
exposing the
“interior” as afinished
surface.
“New” surfaceirregularities
are not grounds
for product
rejection.
Unit are then
separated
exposing the
“interior” as afinished
surface.
“New” surfaceirregularities
are not grounds
for product
rejection.
8/13/2019 Concrete Block Presentation
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Split Rib
Manufactured the
same way as split
face but have 8distinct ribs.
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Unit are then
separated
exposing the
“interior” as afinished
surface.
“New” surface
irregularities
are not grounds
for product
rejection.
Unit are then
separated
exposing the
“interior” as afinished
surface.
“New” surface
irregularitiesare not grounds
for product
rejection.
Same process as split-face but with grooves
molded in to provide finished “rib” relief
SplitSplit--Ribbed Concrete MasonryRibbed Concrete Masonry
Siamese Unit is
Mechanically
cracked under
pressure