Shrinkage cracking of lightweight concrete made with cold-bonded fly ash aggregates

Shrinkage cracking performance of lightweight concrete (LWC) has been investigated experimentally on ring-type specimens. LWCs with and without silica fume were produced at water–cementitious material ratios (w/cm) of 0.32 to 0.55 with cold-bonded fly ash coarse aggregates and natural sand. Coarse a...

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Bibliographic Details
Published in:Cement and concrete research 2004-07, Vol.34 (7), p.1121-1130
Main Authors: GESOGLU, Mehmet, ÖZTURAN, Turan, GÜNEYISI, Erhan
Format: Article
Language:English
Subjects:
Aggregates and other concrete constituents
Applied sciences
Buildings. Public works
Cement concrete constituents
Concrete additives (fillers, pozzolanic and hydraulic materials)
Concretes. Mortars. Grouts
Creep
Exact sciences and technology
Lightweight concrete
Lightweight concretes
Materials
Mechanical properties
Shrinkage
Silica fume
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Summary:Shrinkage cracking performance of lightweight concrete (LWC) has been investigated experimentally on ring-type specimens. LWCs with and without silica fume were produced at water–cementitious material ratios (w/cm) of 0.32 to 0.55 with cold-bonded fly ash coarse aggregates and natural sand. Coarse aggregate volume ratios were 30%, 45%, and 60% of the total aggregate volume in the mixtures. A total of 12 lightweight aggregate concrete mixtures was cast and tested for compressive strength, static elastic modulus, split-tensile strength, free shrinkage, weight loss, creep, and restrained shrinkage. It was found that the crack opening on ring specimens was wider than 2 mm for all concretes. Free shrinkage, weight loss, and maximum crack width increased, while compressive and split-tensile strengths, static elastic modulus, and specific creep decreased with increasing coarse aggregate content. The use of silica fume improved the mechanical properties but negatively affected the shrinkage performance of LWCs. Shrinkage cracking performance of LWCs was significantly poorer than normal weight concrete (NWC).
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2003.11.024