Effects of portland cement particle size on heat of hydration : [summary].
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2013-12-01
By Zayed, Abla
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Abstract:Generally, when materials are heated (or cooled),
they expand (or contract) to a greater or lesser
extent. Even a material as rock-like as concrete
is susceptible to thermal effects, and expansion
joints are used for this reason: to allow concrete
to expand and contract without buckling.
Thermal expansion of concrete is especially
important for concrete poured in massive forms.
Setting concrete generates heat as chemical
components react and form bonds to produce
concrete’s characteristic strength. However,
concrete conducts heat poorly, and the heat
inside a massive pour may take more time to
dissipate than the outer regions, which can cool
faster. Contraction of outer layers over inner
layers can cause cracks, reducing the concrete’s
strength, structural integrity, and service life. The
potential for thermal cracking is increased by high
temperatures, common throughout Florida.
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