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The effect of internal curing in the compressivestrength depends on the specific
mixture proportions, curing conditions and testing age. (Bentz etal., 2011 pp. 31)
Use of the LWA will decrease the compressive strength of theconcrete in the beginning
of its age. That is expected because the specific gravity of theLWA is lower, therefore
leading to lower strength compared to concrete with normal weightaggregate. Previous
studies have shown though, that the long-term compressive strengthwill increase when
internal curing is used, so it is likely that concrete with LWA hasa higher long-term
compressive strength than concrete with normal weight aggregate.(Kerby, 2010 pp. 10)
Although the internal curing might improve the strength of thepaste by providing
additional water to the hydration process, the weakening effect bythe weaker and softer
aggregate can affect more to the overall behaviour, reducing thestrength. (Schlitter et
al., 2010 pp. 139)
