A critical review on drying shrinkage mitigation strategies in cement-based materialsShow others and affiliations
2021 (English)In: Journal of Building Engineering, E-ISSN 2352-7102, Vol. 38, article id 102210Article, review/survey (Refereed) Published
Abstract [en]
Drying shrinkage deformation due to moisture migration is a major concern in cementitious materials and can lead to a high probability of cracking, resulting in a deterioration in long-term performance and serviceability. In this paper, the primary mechanisms of drying shrinkage, mitigation strategies and the research gaps are elucidated to provide a comprehensive understanding of the factors influencing drying shrinkage and identify research strategies to assist in the development of novel shrinkage-resistant concrete. The use of shrinkage-reducing admixture is identified as the high-efficiency methodology. This reduces the surface tension of the liquid in the capillary pore, resulting in a 20–50% drying shrinkage reduction when applied with a dosage up to 3%. It can achieve even greater efficiency by combining the admixture with expansive agents to provide synergistic effects, giving mitigation of drying shrinkage of up to 80%. Replacing cement with supplementary cementitious materials, up to 35%, is also an effective approach to mitigate drying shrinkage, giving a reduction between 5–42%. The reinforcing effect of novel carbon-nanotubes, albeit at a small dosage (0.1% w.t), can effectively strengthen the C–S–H gel matrix, resulting in a drying shrinkage reduction of 15–21%. Introducing internal restraints using fibres or aggregate also demonstrates high effectiveness for drying shrinkage mitigation. Furthermore, coupled CO2-water curing or coating the concrete surface to prevent moisture loss provides an innovative approach to drying shrinkage reduction at an early age (50–70%). Finally, to avert time-dependent deformation, the use of superplasticizer (less than 1%) based on the polycarboxylate polymer is suggested.
Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 38, article id 102210
Keywords [en]
Drying shrinkage mechanism, Shrinkage mitigation strategies, Capillary tension, Cementitious materials, Shrinkage-resistant concrete
National Category
Other Materials Engineering
Research subject
Building Materials
Identifiers
URN: urn:nbn:se:ltu:diva-82717DOI: 10.1016/j.jobe.2021.102210ISI: 000647477400001Scopus ID: 2-s2.0-85100036514OAI: oai:DiVA.org:ltu-82717DiVA, id: diva2:1523947
Note
Validerad;2021;Nivå 2;2021-01-29 (alebob);
Finansiär: Australian Research Council Industrial Transformation Research Hub for nanoscience-based construction material manufacturing (IH150100006), Australian Government
2021-01-292021-01-292021-05-21Bibliographically approved