|
A Concise Cement Glossary
Cement Mixture: A mixture that consists
of cement and water.
Cement Mortar: A mixture that consists of cement, water
and sand.
Hydration: Hardening of cement after being mixed with cement.
Setting time: In cement standards, setting time of cement
is designated by two definitions, namely “Initial setting
time” and “Final setting time”.
Initial setting time: Time elapsed until the mixture formed
by mixing cement with water starts to harden (i.e. it loses
its plastic properties).
Final setting time: Time elapsed until the mixture formed
by mixing cement with water hardens.
Heat of hydration: Amount of heat emitted by cement during
the hydration process; as measured between an initial particular
temperature, until the end of the hydration process. Chemical
reactions that initiate upon combination of cement with water
are exothermic. As the reactions continue, heat emission
continues as well. Heat of hydration, which at first is high,
decreases gradually.
Meanings of the symbols:
Figures 32,5; 42,5; and 52,5: Designate the minimum compression
strength at 28 days, in N/mm2. This test is conducted on
cement mortar. The test requires special sand, namely “standard
sand”.
“R”: Designates rapid strength feature, in owing to the
word “Rapid” in English.
“N”: Designates that “No” rapid strength feature is involved.
“A”, “B” and “C”: Designate the amount of additive employed.
“A” stands for low additive content,
“B” stands for high additive content,
“C” stands for higher additive content.
“M”: Stands for composite cement.
|
