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Impact of super absorbent polymers on early age behavior of ultra-high performance concrete walls

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Abstract
Early age cracking, a common problem for Ultra-High Performance Concrete (UHPC), is caused by Autogenous Shrinkage (AS) and self-desiccation arising from the chemical shrinkage during the cement hydration reactions when the deformation is restrained. However, to avoid the crack development initiated by AS, several solutions can be adopted; one example is the addition of a promising material, considered as an internal curing agent, the Super Absorbent Polymers (SAP) which limits the capillary depressions that can enhance the formation of the crack. In this study the main goal is to mitigate the shrinkage using SAPs in infrastructure under severe conditions. Therefore, a demonstrator wall was built simulating a typical case with high risk of cracking. With the help of fiber optic SOFO sensors embedded in the wall, real-time deformations are recorded and compared the demountable mechanical strain gauges (DEMEC) measurements to further investigate the behavior of SAPs in real scale infrastructure. The amount of extra water (in SAP) needed to mitigate shrinkage was determined by performing chemical shrinkage tests on different cement paste combinations. Tests of autogenous shrinkage were performed on mortars using corrugated tubes and showed that SAPs reduce to some extent the AS. Under restrained conditions via ring tests, SAP specimens did not crack. Therefore, SAPs were found promising towards mitigating the shrinkage and enhancing the early age behavior of concrete for a better durability.

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MLA
Kheir, Judy, et al. “Impact of Super Absorbent Polymers on Early Age Behavior of Ultra-High Performance Concrete Walls.” Durable Concrete for Infrastructure under Severe Conditions : Smart Admixtures, Self-Responsiveness and Nano-Additions, edited by Maria Adelaide Pereira Gomes de Araújo et al., Magnel Laboratory for Concrete Research, 2019, pp. 217–22.
APA
Kheir, J., De Meyst, L., Tenório Filho, J. R., Hammer, T. A., Klausen, A., Hilloulin, B., … De Belie, N. (2019). Impact of super absorbent polymers on early age behavior of ultra-high performance concrete walls. In M. A. Pereira Gomes de Araújo, N. De Belie, & K. Van Tittelboom (Eds.), Durable Concrete for Infrastructure under Severe Conditions : Smart Admixtures, self-responsiveness and nano-additions (pp. 217–222). Ghent, Belgium: Magnel Laboratory for Concrete Research.
Chicago author-date
Kheir, Judy, Laurence De Meyst, José Roberto Tenório Filho, T.A. Hammer, A. Klausen, B. Hilloulin, A. Loukili, and Nele De Belie. 2019. “Impact of Super Absorbent Polymers on Early Age Behavior of Ultra-High Performance Concrete Walls.” In Durable Concrete for Infrastructure under Severe Conditions : Smart Admixtures, Self-Responsiveness and Nano-Additions, edited by Maria Adelaide Pereira Gomes de Araújo, Nele De Belie, and Kim Van Tittelboom, 217–22. Magnel Laboratory for Concrete Research.
Chicago author-date (all authors)
Kheir, Judy, Laurence De Meyst, José Roberto Tenório Filho, T.A. Hammer, A. Klausen, B. Hilloulin, A. Loukili, and Nele De Belie. 2019. “Impact of Super Absorbent Polymers on Early Age Behavior of Ultra-High Performance Concrete Walls.” In Durable Concrete for Infrastructure under Severe Conditions : Smart Admixtures, Self-Responsiveness and Nano-Additions, ed by. Maria Adelaide Pereira Gomes de Araújo, Nele De Belie, and Kim Van Tittelboom, 217–222. Magnel Laboratory for Concrete Research.
Vancouver
1.
Kheir J, De Meyst L, Tenório Filho JR, Hammer TA, Klausen A, Hilloulin B, et al. Impact of super absorbent polymers on early age behavior of ultra-high performance concrete walls. In: Pereira Gomes de Araújo MA, De Belie N, Van Tittelboom K, editors. Durable Concrete for Infrastructure under Severe Conditions : Smart Admixtures, self-responsiveness and nano-additions. Magnel Laboratory for Concrete Research; 2019. p. 217–22.
IEEE
[1]
J. Kheir et al., “Impact of super absorbent polymers on early age behavior of ultra-high performance concrete walls,” in Durable Concrete for Infrastructure under Severe Conditions : Smart Admixtures, self-responsiveness and nano-additions, Ghent, Belgium, 2019, pp. 217–222.
@inproceedings{8661617,
  abstract     = {Early age cracking, a common problem for Ultra-High Performance Concrete (UHPC), is caused by Autogenous Shrinkage (AS) and self-desiccation arising from the chemical shrinkage during the cement hydration reactions when the deformation is restrained. However, to avoid the crack development initiated by AS, several solutions can be adopted; one example is the addition of a promising material, considered as an internal curing agent, the Super Absorbent Polymers (SAP) which limits the capillary depressions that can enhance the formation of the crack. In this study the main goal is to mitigate the shrinkage using SAPs in infrastructure under severe conditions. Therefore, a demonstrator wall was built simulating a typical case with high risk of cracking. With the help of fiber optic SOFO sensors embedded in the wall, real-time deformations are recorded and compared the demountable mechanical strain gauges (DEMEC) measurements to further investigate the behavior of SAPs in real scale infrastructure. The amount of extra water (in SAP) needed to mitigate shrinkage was determined by performing chemical shrinkage tests on different cement paste combinations. Tests of autogenous shrinkage were performed on mortars using corrugated tubes and showed that SAPs reduce to some extent the AS. Under restrained conditions via ring tests, SAP specimens did not crack. Therefore, SAPs were found promising towards mitigating the shrinkage and enhancing the early age behavior of concrete for a better durability.},
  author       = {Kheir, Judy and De Meyst, Laurence and Tenório Filho, José Roberto and Hammer, T.A. and Klausen, A. and Hilloulin, B. and Loukili, A. and De Belie, Nele},
  booktitle    = {Durable Concrete for Infrastructure under Severe Conditions : Smart Admixtures, self-responsiveness and nano-additions},
  editor       = {Pereira Gomes de Araújo, Maria Adelaide and De Belie, Nele and Van Tittelboom, Kim},
  isbn         = {9789463886383},
  language     = {eng},
  location     = {Ghent, Belgium},
  pages        = {217--222},
  publisher    = {Magnel Laboratory for Concrete Research},
  title        = {Impact of super absorbent polymers on early age behavior of ultra-high performance concrete walls},
  year         = {2019},
}