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Self-healing mortar with pH-sensitive superabsorbent polymers : testing of the sealing efficiency by water flow tests

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Abstract
Superabsorbent polymers (SAPs) have potential to be used as healing agent in self-healing concrete due to their property to attract moisture from the environment and their capacity to promote autogenous healing. A possible drawback, however, is their uptake of mixing water during concrete manufacturing, resulting in an increased volume of macro-pores in the hardened concrete. To limit this drawback, newly developed SAPs with a high swelling and pH-sensitiveness were developed and tested within the FP7 project HEALCON. Evaluation of their self-sealing performance occurred through a water permeability test via water flow, a test method also developed within HEALCON. Three different sizes of the newly developed SAP were compared with a commercial SAP. Swelling tests in cement filtrate solution indicated that the commercial and in-house synthesized SAPs performed quite similar, but the difference between the swelling capacity at pH 9 and pH 13 is more pronounced for the self-synthesized SAPs. Moreover, in comparison to the commercial SAPs, less macro-pores are formed in the cement matrix of mixes with self-synthesized SAPs and the effect on the mechanical properties is lower, but not negligible, when using high amounts of SAPs. Although the immediate sealing effect of cracks in mortar was the highest for the commercial SAPs, the in-house made SAPs with a particle size between 400 and 600 mu m performed the best with regard to crack closure (mainly CaCO3 precipitation) and self-sealing efficiency, after exposing the specimens to 28 wet-dry cycles. Some specimens could even withstand a water pressure of 2 bar.
Keywords
concrete, self-healing, superabsorbent polymers, permeability

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Chicago
Gruyaert, Elke, Brenda Debbaut, Didier Snoeck, Pilar Díaz, Alejandro Arizo, Eirini Tziviloglou, Erik Schlangen, and Nele De Belie. 2016. “Self-healing Mortar with pH-sensitive Superabsorbent Polymers : Testing of the Sealing Efficiency by Water Flow Tests.” Smart Materials and Structures 25 (8).
APA
Gruyaert, E., Debbaut, B., Snoeck, D., Díaz, P., Arizo, A., Tziviloglou, E., Schlangen, E., et al. (2016). Self-healing mortar with pH-sensitive superabsorbent polymers : testing of the sealing efficiency by water flow tests. SMART MATERIALS AND STRUCTURES, 25(8).
Vancouver
1.
Gruyaert E, Debbaut B, Snoeck D, Díaz P, Arizo A, Tziviloglou E, et al. Self-healing mortar with pH-sensitive superabsorbent polymers : testing of the sealing efficiency by water flow tests. SMART MATERIALS AND STRUCTURES. IOP Publishing; 2016;25(8).
MLA
Gruyaert, Elke et al. “Self-healing Mortar with pH-sensitive Superabsorbent Polymers : Testing of the Sealing Efficiency by Water Flow Tests.” SMART MATERIALS AND STRUCTURES 25.8 (2016): n. pag. Print.
@article{8524119,
  abstract     = {Superabsorbent polymers (SAPs) have potential to be used as healing agent in self-healing concrete due to their property to attract moisture from the environment and their capacity to promote autogenous healing. A possible drawback, however, is their uptake of mixing water during concrete manufacturing, resulting in an increased volume of macro-pores in the hardened concrete. To limit this drawback, newly developed SAPs with a high swelling and pH-sensitiveness were developed and tested within the FP7 project HEALCON. Evaluation of their self-sealing performance occurred through a water permeability test via water flow, a test method also developed within HEALCON. Three different sizes of the newly developed SAP were compared with a commercial SAP. Swelling tests in cement filtrate solution indicated that the commercial and in-house synthesized SAPs performed quite similar, but the difference between the swelling capacity at pH 9 and pH 13 is more pronounced for the self-synthesized SAPs. Moreover, in comparison to the commercial SAPs, less macro-pores are formed in the cement matrix of mixes with self-synthesized SAPs and the effect on the mechanical properties is lower, but not negligible, when using high amounts of SAPs. Although the immediate sealing effect of cracks in mortar was the highest for the commercial SAPs, the in-house made SAPs with a particle size between 400 and 600 mu m performed the best with regard to crack closure (mainly CaCO3 precipitation) and self-sealing efficiency, after exposing the specimens to 28 wet-dry cycles. Some specimens could even withstand a water pressure of 2 bar.},
  articleno    = {084007},
  author       = {Gruyaert, Elke and Debbaut, Brenda and Snoeck, Didier and Díaz, Pilar and Arizo, Alejandro and Tziviloglou, Eirini and Schlangen, Erik and De Belie, Nele},
  issn         = {0964-1726},
  journal      = {SMART MATERIALS AND STRUCTURES},
  keywords     = {concrete,self-healing,superabsorbent polymers,permeability},
  language     = {eng},
  number       = {8},
  publisher    = {IOP Publishing},
  title        = {Self-healing mortar with pH-sensitive superabsorbent polymers : testing of the sealing efficiency by water flow tests},
  url          = {http://dx.doi.org/10.1088/0964-1726/25/8/084007},
  volume       = {25},
  year         = {2016},
}

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