Abstract
In the present paper, short term shrinkage and creep of lightweight concrete up to 100 days of designed strengths 25 and 35 MPa were investigated. Results indicated that the autogenous and total shrinkage of lower strength lightweight concrete were higher. The total shrinkage of the G35 mix was 320 × 10–6 comparable to 415 × 10–6 of the G25 mix after 3 months. Though the total creeps were the same at 590 × 10–6, the basic creeps per MPa of the G35 concrete mix are 16˙4% lower than the G25 mix after 3 months. The specific creeps of G35 and G25 mixes were 42˙8 × 10–6 and 60˙9 × 10–6 respectively after 3 months. The larger shrinkage and creep values of the lower grade lightweight concrete mixes were caused by the higher porosity ratio of the lightweight aggregates used and the dissipation of moisture kept inside the aggregate due to prewetting of aggregate during concrete mixing.
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