Cracking tendency of alkali-activated slag concrete subjected to restrained shrinkage

By F. Collins, J. Sanjayan. 2000

203 citations recorded by the source corpus.

Alkali-activated slag concrete (AASC) has higher drying shrinkage than ordinary Portland cement concrete (OPCC). However, the cracking tendency of AASC under drying conditions, when restrained, is unreported. AASC has lower elastic modulus, higher creep, and higher tensile strength than OPCC, and the combined effects of these can affect the cracking tendency of AASC. This article reports the results of cracking tendency utilizing restrained ring tests and discusses the development of a restrained beam test. The effects of curing, aggregate type, and incorporation of shrinkage reducing chemical admixture on the cracking tendency of AASC are reported.

Subfields: Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/571426ad51ee57f09f4efb747e9a97a6e95ac27b

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In Civil and Structural Engineering

Citations in the corpus

Alkali-activated concrete: Engineering properties and stress–strain behavior (2015, result): “A few other studies have suggested improved tensile strength in alkali-activated concretes compared to PCC [22,51,52], as is seen in the present study.”
Effects of dosage of alkali-activated solution and curing conditions on the properties and durability of alkali-activated slag concrete (2012, background): “The effect of activation strongly depends on the physical–chemical nature of the GBFS, the nature and quantity of the activators and the curing condition [6–9].”
Performance of an alkali-activated slag concrete reinforced with steel fibers (2010, background): “However, one of the main technological drawbacks identified in these new alkaline-cements is an increased susceptibility to suffer drying shrinkage, which is influenced principally by the slag microstructure and fineness, alkali-activator nature and concentration and curing conditions [23–27].”
Binding mechanism and properties of alkali-activated fly ash/slag mortars (2013, background): “The chemical composition of alkali activation is still the subject of much discussion in the scientific literature and depends on the physical–chemical nature of the raw materials, the nature and quantity of the activators and the curing condition [19–22].”
Alkali-Activated Materials and Geopolymer: a Review of Common Precursors and Activators Addressing Circular Economy (2021, background): “On the opposite side, however, higher drying shrinkage and cracking [52], higher risk of steel corrosion through chloride ion exchange [53], and loss of durability especially at high temperatures (above 300°C) [54] have been reported for high calcium systems.”