2020-9-27ensp0183ensp1 1 Autogenous self-healing of cement with expansive minerals-I Impact in 2 early age crack healing 3 Tanvir Qureshia , Antonios Kanellopoulosb and Abir Al-Tabbaac 4. a. Department of Civil Engineering, University of Toronto, Toronto M5S 1A4, Ontario, Canada.
Autogenous self-healing of cement with expansive minerals-I Impact in early age crack healing. bentonite clay, and quicklime on the early age autogenous self-healing capacity of Portland cement PC paste.
2016-7-14ensp0183enspAn enhancement in autogenous healing can be created through the use of SCMs such as blast furnace slag BFS and fly ash FA 11, 12. BFS and FA improve autogenous healing by enhancing further hydration. The reason for this is that BFS and FA hydrate slower than cement and thus more unreacted binder materials remain in the matrix.
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2019-10-18ensp0183enspSelf-healing concrete and cementitious materials, which have the ability to recover after initial damage, have the potential to address these challenges. Self-healing technology in concrete and cementitious materials can mitigate the unnecessary repair and maintenance of built infrastructure as well as overall CO2 emission due to cement production.
Cement paste is a Bingham fluid and shows as a rule the thixotropic behaviour.
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Therefore, the mechanisms causing autogenous strain in such systems need to be understood. Ternary blends, such as Portland cement with blast furnace slag and limestone, tend to have a different strength development than OPC, therefore modifying their response to internal stresses caused by self-dessication, among other phenomena.
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2020-7-8ensp0183ensp1 1 Autogenous self-healing of cement with expansive minerals-II Impact of age and the role of optimised expansive minerals in healing performance2 3 Tanvir Qureshia , Antonios Kanellopoulosb and Abir Al-Tabbaac 4. a.
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Cement production process typically involves grinding limestone and other raw materials to achieve the right chemical composition to about 90 passing 90 microns in a dry circuit, making cement by the chemical reaction between the components of the ground mixture.
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Technical committee report on autogenous shrinkage of concrete. Jennings, H.M, 2004. Colloid model of C-S-H and implications to the problem of creep and shrinkage. Materials and Structure. Jensen, O.M. and Hansen, P.F, 2001. Autogenous deformation and RH-change in perspective. In Cement and Concrete Research 31 2001, pp.
classied the different autogenous healing mechanisms along with their degree of inuence. At early age, on-going hydration of cement is mainly responsible for closing cracks. In particular, if insufcient mixing of the cementitious mat-erial takes place, unhydrated cement nuclei remain dispersed within the cementitious matrix.
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2018-1-15ensp0183enspA commercial Ordinary Portland Cement P.O 32.5 and fly ash FA were selected as cementitious materials to prepare porous concrete, and the properties are listed in Table 1, Table 2.Crushed limestone and diabase with various gradations were used as coarse aggregate in this research, sizes of which ranged from 2.36 to 26.5 mm.