Early-age shrinkage assessment of cementitious materials: A critical review

Kurup, Divya S.; Mohan, Manu K.; Van Tittelboom, Kim; De Schutter, Geert; Santhanam, Manu; Rahul, A.V.

doi:10.1016/j.cemconcomp.2023.105343

Cited by 5 publications

(3 citation statements)

References 112 publications

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“…Thus, the density of the paste will definitely go up [117]. The estimation of FA-G blends displayed that TCS was similar for all mixes during the first 12 h [23,118,119]. TCS started to decrease during the first 7 days of hydration.…”

Section: Supplementary Cementitious Materialsmentioning

confidence: 97%

“…The volume of hydrated products of cement paste is smaller than the volume of the reactants (i.e., cement and water). This phenomenon is referred to as chemical shrinkage, hardening shrinkage or Le Chatelier shrinkage [16][17][18][19]23]. Le Chatelier measured the reduction in cement paste volume by means of a simple dilatometer using a glass beaker attached to a tube filled with water.…”

Section: Chemical Shrinkagementioning

confidence: 99%

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A Review on Chemical and Autogenous Shrinkage of Cementitious Systems

Ghanem,

Ramadan,

Khatib

et al. 2024

Materials

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Chemical shrinkage (CS) is an intrinsic parameter that may affect the early age cracking of paste, mortar and concrete. It is well known as the driving force of self-desiccation, autogenous shrinkage (AGS) and drying shrinkage. During the first stage of cement hydration (at the initial setting time), the CS and AGS are equal. In the hardened stages, there is a difference in values between the two shrinkage parameters. This paper is a comprehensive review on CS and AGS, measurement techniques, modeling and prediction of different cementitious systems. Based on the various experimental studies, chemical shrinkage depends on the water to binder ratio (w/b) and is proportional to the degree of hydration. A low w/b ratio leads to high CS and AGS. The composition of cement has an effect on both CS and AGS. Also, incorporating supplementary cementitious materials (SCMs) affects both shrinkage parameters. It is concluded that adding fly ash (FA) to concrete contributes to CS and AGS reductions. However, this is not the case when concrete contains slag. More than 170 references were consulted including 35 which were published after 2020. According to the authors knowledge, there is no published work on the effect of fibers, especially bio-fibers, on the chemical shrinkage of cement-based composites. Therefore, in addition to traditional chemical shrinkage of cementitious systems, this review includes a section on recent papers conducted by the authors on the effect of bio-fibers on the chemical shrinkage of cement composites.

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Section: Supplementary Cementitious Materialsmentioning

confidence: 97%

Section: Chemical Shrinkagementioning

confidence: 99%

A Review on Chemical and Autogenous Shrinkage of Cementitious Systems

Ghanem,

Ramadan,

Khatib

et al. 2024

Materials

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“…Expansion agents can also reduce shrinkage to a certain extent due to their expansion capacity, but a reduction in shrinkage may be difficult to guarantee during curing and serving processes, because water loss may occur at any time. Shrinkage cannot be effectively controlled using these external interventions [22,23]. Thus, shrinkage reduction should be carried out based on the source of shrinkage generation.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage Reduction in Nanopore-Rich Cement Paste Based on Facile Organic Modification of Montmorillonite

Yang,

Chen

et al. 2024

Materials

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The organic modification of montmorillonite was successfully achieved using cetyltrimethyl ammonium bromide under facile conditions. The modified montmorillonite was subsequently used for the fabrication of montmorillonite-induced nanopore-rich cement paste (MNCP), and the shrinkage behavior and fundamental performance of MNCP were also investigated. The results indicate that alkali cations on a montmorillonite layer surface were exchanged by using CTAB under 80 °C, successfully achieving the organic modification of montmorillonite. As a pore-forming agent, the modified montmorillonite caused a reduction in shrinkage: the 28-day autogenous shrinkage at a design density of 400 kg/m3 and 800 kg/m3 was reduced to 2.05 mm/m and 0.24 mm/m, and the highest reduction percentages during the 28-day drying shrinkage were 68.1% and 62.2%, respectively. The enlarged interlamellar pores and hydrophobic effects caused by the organic modification of montmorillonite aided this process. Organic-modified montmorillonite had a minor influence on dry density and thermal conductivity and could contribute to an enhancement of strength in MNCP.

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