Civil Engineering Reference
In-Depth Information
hollow masonry units for the purpose of (1) bonding the masonry units, (2)
bonding the reinforcing steel to the masonry, (3) increasing the bearing area,
(4) increasing fire resistance, and (5) improving the overturning resistance
by increasing the weight. The compressive strength of grout is usually about
14 MPa (2000 psi) at 28 days.
8.4
Plaster
Plaster is a fluid mixture of portland cement, lime, sand, and water, which
is used for finishing either masonry walls or framed (wood) walls. Plaster is
used for either exterior or interior walls. Stucco is plaster used to cover ex-
terior walls. The average compressive strength of plaster is about 13.8 MPa
(2000 psi) at 28 days.
SUMMARY
Masonry is one of the oldest building technologies, dating back to use of
sun-dried adobe blocks in ancient times. Modern masonry units are pro-
duced to high standards in the manufacturing process. While the strength of
the masonry units is important for quality control, the strength of masonry
construction is generally limited by the ability to bond the units together
with mortar. The ability of masonry units to resist environmental degrada-
tion is an important quality consideration. This ability is closely related to
the absorption of the masonry units.
QUESTIONS
AND
PROBLEMS
8.1
Define solid and hollow masonry units according to ASTM C90.
8.2
What are the advantages of masonry walls over framed (wood) walls?
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