10.1 Curing Procedure
Curing procedure will
be categorized into 2 methods according to temperature that they may be subject
to, which are
1.
curing
at normal temperature
2.
curing
at certain degree of temperature with high pressure
Figure 10.1 show the influence of curing toward compressive strength of
concrete, which can be summarized as
·
At the
early stage, strength of concrete is significantly soaring when curing is
implemented. Thus, this indicates of how important of curing would be.
·
Possibility
that concrete will continue developing its strength after 28 days is noticeably
gradual and on the condition that concrete should be well-treated curing as
well.
·
In
accordance with absence of moisture, concrete will consume residual humidity to
carry on increasing its strength. However, this will only last for a while as
later enhancement of strength will consequently stop, take for instance;
concrete that cured for 3 days will produce strength up to 75 – 80% of concrete
that cured for 28 days.
Unquestionably, concrete should be cured as
long as possible in order to obtain the requirement. Although in practice,
curing can not be carried out as expected due to several constraints restrict
the procedure itself i.e. working schedule and budget. From Figure 10.1, it is
clearly showing that curing at 7 days will equivalently generate the
compressive strength comparing with concrete that cured and tested in humid
condition for 28 days. In accordance with American standard, 7 days of curing
is recommended for general reinforced concrete structure, which alternatively
such period could also be varied to any durations that give 70% of designed compressive
or tensile strength. On the other hand, mass concrete is left for exclusion ex.
Mat foundation that shall be cured for at least 2 weeks or more.
For any circumstances that
curing is paused, hydration reaction can be resumed when curing is applied
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