Enhancement of shrinkage behavior of lightweight aggregate concretes by shrinkage reducing admixture and fiber reinforcement

•We studied lightweight aggregate concretes (LWACs).•Shrinkage reducing admixture (SRA) and steel fiber (SF) were used in LWACs.•Effect of SRA and SF was examined on the shrinkage behavior of LWACs.•Restrained and free shrinkage behavior of LWACs were evaluated.•SRA modified LWACs revealed comparabl...

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Bibliographic Details
Published in:Construction & building materials 2014-03, Vol.54, p.91-98
Main Authors: Güneyisi, Erhan, Gesoğlu, Mehmet, Mohamadameen, Alaa, Alzeebaree, Radhwan, Algın, Zeynep, Mermerdaş, Kasım
Format: Article
Language:English
Subjects:
Analysis
Cement
Lightweight concrete
Mechanical properties
Properties
Reinforced concrete, Fiber
Shrinkage cracking
Shrinkage reducing admixture
Steel fiber
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Summary:•We studied lightweight aggregate concretes (LWACs).•Shrinkage reducing admixture (SRA) and steel fiber (SF) were used in LWACs.•Effect of SRA and SF was examined on the shrinkage behavior of LWACs.•Restrained and free shrinkage behavior of LWACs were evaluated.•SRA modified LWACs revealed comparable shrinkage performance to those with SF. This paper presents the results obtained from an experimental study conducted to investigate the effect of shrinkage reducing admixture (SRA) and steel fiber addition on the performance properties of lightweight aggregate concrete (LWAC). Total of seven LWAC mixes with SRA or steel fibers were produced at the same water-cement ratio using cold-bonded fly ash coarse aggregates. The percentage of steel fiber volume fractions used in the mixes was 0.25, 0.75 and 1.25. The amount of SRA used in the mixes was 0.75%, 1.5% and 3 % by weight of cement. Ring type specimens were used for the restrained shrinkage cracking test. At the same time, free shrinkage and weight loss of LWACs were measured. Moreover, the compressive and split tensile strength tests were undertaken. The results indicated that the use of steel fibers has little effect on compressive strength but it improves the split tensile strength. The addition of SRA decreases compressive strength without affecting tensile strength. Moreover, the utilization of steel fiber or SRA extends the cracking time and reduces the crack width of LWAC resulting in finer cracks associated with lower free shrinkage.
ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2013.12.041