Autogenous shrinkage of alkali activated slag mortars: Basic mechanisms and mitigation methods
By Darshan Ballekere Kumarappa, S. Peethamparan, Margueritte Ngami. Cement and Concrete Research, 2018
233 citations recorded by the source corpus.
Abstract This paper presents various mechanisms that can explain the cause of excessive autogenous shrinkage exhibited by alkali activated slag mortars (AASM) compared to Portland cement mortars (OPC). The influence of activator concentration parameters such as Na2O content and of the silica modulus (Ms) on the magnitude of autogenous shrinkage are evaluated, as are the proposed mechanisms. The results show that the shrinkage kinetics of AASM is strongly dependent upon the rate of reaction, internal relative humidity (RH) and surface tension of the pore solution. Pore size variation between AASM and OPC mortars and the corresponding tensile stresses based on the capillary tension approach were also calculated using experimentally measured internal RH and surface tension values. A higher amount of both Na2O and Ms. resulted in larger capillary stress resulting in greater autogenous shrinkage. Use of internal curing and of shrinkage reducing admixture were very effective in reducing the autogenous shrinkage of AASMs.
Subfields: Civil and Structural Engineering
View Paper: https://www.semanticscholar.org/paper/43ad4d2a4cf971b733697af874dec2ae37c4f681
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In Civil and Structural Engineering
Citations in the corpus
- Mitigating the autogenous shrinkage of alkali-activated slag by metakaolin (2019, methodology): “A SRA for OPC-based system was found to effectively reduce the autogenous shrinkage of AAS according to Ballekere et al.[21].”
- Mechanisms of autogenous shrinkage of alkali-activated slag and fly ash pastes (2020, result): “These findings are in line with the data reported in literature [17,18,20,39,40].”