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

• Published in: Cement and concrete research Vol. 34; no. 7; pp. 1121 - 1130
• Main Authors: GESOGLU, Mehmet, ÖZTURAN, Turan, GÜNEYISI, Erhan
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 01.07.2004; Elsevier Science
• 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; Mechanical properties; Shrinkage; Creep; Lightweight concrete; Silica fume; Performance evaluation; Elastic modulus; Material composition; Weight loss; Cracking; Experimental study; Fly ash; Experimental result; Coarse aggregate; Physicochemical properties; Strength
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/j.cemconres.2003.11.024

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).