TY - JOUR
T1 - Application of encapsulated superabsorbent polymers in cementitious materials for stimulated autogenous healing
AU - Pelto, Jani
AU - Leivo, Markku
AU - Gruyaert, Elke
AU - Debbaut, Brenda
AU - Snoeck, Didier
AU - De Belie, Nele
N1 - Funding Information:
As a Postdoctoral Research Assistant of the Research Foundation-Flanders (FWO-Vlaanderen), Didier Snoeck wants to thank the foundation for its financial support.
Funding Information:
The research leading to these results has received funding from the European Union Seventh Framework Program (FP7/2007–2013) under grant agreement n° 309451 (HEALCON).
Publisher Copyright:
© 2017 IOP Publishing Ltd.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017
Y1 - 2017
N2 - Superabsorbent polymers have shown potential for use in
mortar and concrete as self-healing agents. The main
drawback is, however, that these superabsorbent polymers
also absorb mixing water during the preparation and
casting of mortar or concrete, leading to a loss in
workability. To avoid the absorption of mixing water,
superabsorbent polymers were coated using a fluid bed
spraying process. The barrier coating consisted of three
successive coating layers: polyvinylbutyral as
primer/wetting layer, cyclo-olefin copolymer as a barrier
layer and a sol-gel derived zirconium-silicon oxide as an
adhesion-promoting topcoat layer. The coated SAPs were
characterized, and their swelling determined to quantify
the delay in uptake of water and Ca(OH)2 solution. The
last was considered as the most important, as the SAPs
will finally be applied in mortar or concrete having a
pore solution with high pH. The results showed that
swelling could be delayed to a large extent, but for a
short time. Results showed that the self-sealing
efficiency of mortars was not affected by coating the
SAPs. Moreover, due to the reduced uptake of mixing
water, the strength reduction, noticed when uncoated SAPs
were added to the mortar, could partly be compensated.
AB - Superabsorbent polymers have shown potential for use in
mortar and concrete as self-healing agents. The main
drawback is, however, that these superabsorbent polymers
also absorb mixing water during the preparation and
casting of mortar or concrete, leading to a loss in
workability. To avoid the absorption of mixing water,
superabsorbent polymers were coated using a fluid bed
spraying process. The barrier coating consisted of three
successive coating layers: polyvinylbutyral as
primer/wetting layer, cyclo-olefin copolymer as a barrier
layer and a sol-gel derived zirconium-silicon oxide as an
adhesion-promoting topcoat layer. The coated SAPs were
characterized, and their swelling determined to quantify
the delay in uptake of water and Ca(OH)2 solution. The
last was considered as the most important, as the SAPs
will finally be applied in mortar or concrete having a
pore solution with high pH. The results showed that
swelling could be delayed to a large extent, but for a
short time. Results showed that the self-sealing
efficiency of mortars was not affected by coating the
SAPs. Moreover, due to the reduced uptake of mixing
water, the strength reduction, noticed when uncoated SAPs
were added to the mortar, could partly be compensated.
KW - superabsorbent polymers
KW - coating
KW - self-healing
KW - mortar
UR - http://www.scopus.com/inward/record.url?scp=85030168053&partnerID=8YFLogxK
U2 - 10.1088/1361-665X/aa8497
DO - 10.1088/1361-665X/aa8497
M3 - Article
SN - 0964-1726
VL - 26
JO - Smart Materials and Structures
JF - Smart Materials and Structures
IS - 10
M1 - 105043
ER -