| Summary: | 碩士 === 國立成功大學 === 土木工程研究所 === 86 === The demand for reinforced concrete is increasing in civil
engineering in Taiwan. It is important to understand the
properties of reinforced concrete and obtain the qualitative and
quantitative information to use. To achieve thisgoal, more
researches are needed for reinforced concrete. Beside
structural destruction of reinforced concrete, we must take
thedurable problems into consideration. For example, we should
consider thephysical destruction, such as wetting and drying,
temperature changes, freezing and thawing, wear and abrasion,
and the chemical destruction, suchas sulfate attack, acids and
alkalis, alkali-aggregate reactions, leaching andefflorescence
and so on. Reactions will occur if the reinforced concrete
isunder the complicated circumstances. In order to understand
the mechanismsfor the destruction, we should do researches term
by term to avoid the interactions of the reactions. Time is a
very important factor in concrete durability. It costs much time
inexperiments for durability, because experiments are usually
done by field survey and sampling chronically. Although a lot of
information can beobtained, they are not usually analytical
easily or even useless owing to theunspecified material
properties of the samples. In order to get rid of these defects,
scholars introduced the accelerating methods to shorten the time
needed for the experiments. It is convenient for us to use the
methods tocontrol the properties of the samples. But up to now
we can not know howfast the work is done by the methods. During
the experiment, we try to record the carbonated depth, the
compression strength, the electrode potential of corrosion steel
and so on toestimate the effects of the accelerating methods. In
this way, we can establishthe relations of the sulfate attack
and the carbonation about the time andunderstand the changes and
the mechanisms of the reinforced concrete.Perhaps we can offer
some suggestions or some resources for it.
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