Self-crack closing ability of mortar with different additives
Keywords:
Additives, Crack width, Crystalline admixture, Expansive additive, Fly ash, Limestone powder, Self-crack closing, Silica fumeAbstract
Self-crack closing ability of cementitious materials has been studied in various aspects. However, most studies focus mainly on the cementitious material with only cement as a binder (without mineral additives), although many additives are commonly used at present. This research thus aims to investigate the effect of additives on this self-crack closing ability by observing and measuring crack width on the mortar specimens. Cracks were created on mortar specimens by splitting method at the age of 3 and 28 days. As most reports show that the best self-crack closing performance was achieved when a plenty of water was supplied, the cracked specimens were thus cured in water for investigation of the self-crack closing ability. According to the results, it was observed that all mortars showed self-crack closing ability to some extent, even the control mortar which had no additive. In addition, the results indicate that adding some types of additive improved the self-crack closing ability of mortar. For the range of 0 - 0.05 mm crack width, mortar with crystalline admixture showed the best performance to close its cracks at both cracking ages (3 and 28 days). However, for larger cracks, mortar with silica fume was more outstanding in terms of self-crack closing ability, especially when the crack was generated at the age of 28 days. Fly ash was found to be the worst additive to promote self-crack closing ability of mortar in most cases.Downloads
References
Wagner, E.F. (1974). Autogenous healing of cracks in cement-mortar linings for gray-iron and ductile-iron water pipe. Journal of the American Water Works Association. 66(6): 358-360.
Edvardsen, C. (1999). Water permeability and autogenous healing of cracks in concrete. ACI Mater. J. 96(4): 448-454.
Jacobsen, S., Marchand, J. & Boisvert, L. (1996). Effect of cracking and healing on chloride transport in OPC concrete. Cement Concrete Res. 26(6): 869-881.
Neville, A. (2002). Autogenous healing – A concrete miracle? Concrete International. 24(11): 76-82.
Qian, S., Zhou, J., De Rooji, M.R., Schlangen, E., Ye, G. & Breugel, K. (2009). Self-healing behavior of strain hardening cementitious composites incorporating local waste materials. Cement Concrete Comp. 31(9): 613-621.
Reinhardt, H.W. & Joose, M. (2003). Permeability and self-healing of cracked concrete as a function of temperature and crack width. Cement Concrete Res. 33(7): 981-985.
Jacobsen, S., Marchand, J. & Hornain, H. (1995). SEM observations of the microstructure of frost deteriorated and self-healed concretes. Cement Concrete Res. 25(8): 1781-1790.
Sahmaran, M., Keskin, S.B., Ozerkan, G. & Yaman, I.O. (2008). Self-healing of mechanically-loaded self consolidating concretes with high volumes of fly ash. Cement Concrete Comp. 30(10): 872-879.
Yang, Y., Lepech, M.D., Yang, E.H. & Li, V.C. (2009). Autogenous healing of engineered cementitious composites under wet-dry cycles. Cement Concrete Res. 39(5): 382-390.
Yamada, K., Hosoda, A., Kishi, T. & Nozawa., S. (2007). Crack self healing properties of expansive concretes with various cements and admixtures. In: Proceedings of the First International Conference on Self Healing Materials. April 18-20, Noordwijk aan Zee, The Netherlands.
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2017 Journal of Metals, Materials and Minerals
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Authors who publish in this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
