Earthquakes and Structures

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Pinning retrofit technique in masonry with application of polymer-cement pastes as bonding agents

  • Shrestha, Kshitij C. (Department of Architecture and Architectural Engineering, Graduate School of Engineering, Kyoto University) ;
  • Pareek, Sanjay (Department of Architecture, College of Engineering, Nihon University) ;
  • Suzuki, Yusuke (International Research Institute of Disaster Science, Tohoku University) ;
  • Araki, Yoshikazu (Department of Architecture and Architectural Engineering, Graduate School of Engineering, Kyoto University)
  • Received : 2013.04.18
  • Accepted : 2013.07.06
  • Published : 2013.10.25
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Abstract

This paper reports extensive experimental study done to compare workability and bond strength of five different types of polymer-based bonding agents for reinforcing bars in pinning retrofit. In pinning retrofit, steel pins of 6 to 10 mm diameters are inserted into holes drilled diagonally from mortar joints. This technique is superior to other techniques especially in retrofitting historic masonry constructions because it does not change the appearance of constructions. With an ordinary cement paste as bonding agent, it is very difficult to insert reinforcing bars at larger open times due to poor workability and very thin clearance available. Here, open time represents the time interval between the injection of bonding agent and the insertion of reinforcing bars. Use of polymer-cement paste (PCP), as bonding agent, is proposed in this study, with investigation on workability and bond strengths of various PCPs in brick masonry, at open times up to 10 minutes, which is unavoidable in practice. Corresponding nonlinear finite element models are developed to simulate the experimental observations. From the experimental and analytical study, the Styrene-Butadiene Rubber polymer-cement paste (SBR-PCP) with prior pretreatments of drilled holes showed strong bond with minimum strength variation at larger open times.

Keywords

References

  1. Abrams, D., Smith, T., Lynch, J. and Franklin, S. (2007), "Effectiveness of rehabilitation on seismic behavior of masonry piers", J. Struct. Eng. - ASCE, 133(1), 32-43. https://doi.org/10.1061/(ASCE)0733-9445(2007)133:1(32)
  2. Anagnostopoulos, C.A. and Anagnostopoulos, A.C. (2002), "Polymer-cement mortars for repairing ancient masonries mechanical properties", Constr. Build. Mater., 16(7), 379-384. https://doi.org/10.1016/S0950-0618(02)00040-5
  3. Ashraf, M., Khan, A.N., Naseer, A., Ali, Q. and Alam, B. (2012), "Seismic behavior of unreinforced and confined brick masonry walls before and after ferrocement overlay retrofitting", Int.. J. Archit. Heritage, 6(6), 665-688. https://doi.org/10.1080/15583058.2011.599916
  4. Calderini, C. (2008), "Use of reinforced concrete in preservation of historic buildings: conceptions and misconceptions in the early 20th century", Int.. J. Archit. Heritage, 2(1), 25-59. https://doi.org/10.1080/15583050701533521
  5. Curti, E., Podesta, S. and Resemini, S. (2008), "The post-earthquake reconstruction process of monumental masonry buildings: Suggestions from the Molise event (Italy)", Int.. J. Archit. Heritage, 2(2), 120-154. https://doi.org/10.1080/15583050701646703
  6. DIANA (2008), DIANA User's Manual Release 9.., TNO DIANA BV, Delft, Netherlands.
  7. Faella, C., Martinelli, E., Nigro, E. and Paciello, S. (2010), "Shear capacity of masonry walls externally strengthened by a cement-based composite material: An experimental campaign", Constr. Build. Mater., 24(1), 84-93. https://doi.org/10.1016/j.conbuildmat.2009.08.019
  8. Fowler, D.W. (1999), "Polymers in concrete: a vision for the 21st century", Cement Concrete Comp., 21(5-6), 449-452. https://doi.org/10.1016/S0958-9465(99)00032-3
  9. Kikuchi, K., Kuroki, K., Toyodome, M., Escobar, C. and Nakano, Y. (2008), "Seismic retrofit of unreinforced clay brick masonry wall using polymer-cement mortar", Proceedings of 14th World Conference on Earthquake Engineering, Beijing, China, October.
  10. Lourenco, P.B. and Rots, J.G. (1997), "Multisurface interface model for analysis of masonry structures", J. Eng. Mech., 123(7), 660-668. https://doi.org/10.1061/(ASCE)0733-9399(1997)123:7(660)
  11. Maranhao, F.L. and John, V.M. (2009), "Bond strength and transversal deformation aging on cement-polymer adhesive mortar", Constr. Build. Mater., 23(2), 1022-1027. https://doi.org/10.1016/j.conbuildmat.2008.05.019
  12. Ohama, Y. (1995), Handbook of polymer-modified concrete and mortar, properties and process technology, Noyes Publications, New Jersey, USA.
  13. Ohama, Y. (1998), "Polymer-based admixtures", Cement Concrete Comp., 20(2-3), 189-212. https://doi.org/10.1016/S0958-9465(97)00065-6
  14. Oliveira, D.V., Lourenco, P.B. and Roca, P. (2006), "Cyclic behaviour of stone and brick masonry under uniaxial compressive loading", Mater. Struct., 39(286), 247-257.
  15. Pareek, S. and Kuroda, K. (2003), "Evaluation of polymer-cement pastes as bonding agents for flexural strengthening of RC beams by continuous fiber sheets", Proceedings of Intern. Symposium on Latest Achievement of Techno. Rese. Retrofitting Concrete Struct., Kyoto, Japan.
  16. Shrestha, K.C., Nagae, T. and Araki, Y. (2011a), "Finite element modeling of cyclic out-of-plane response of masonry walls retrofitted by inserting inclined stainless steel bars", J. Disaster Res., 6(1), 36-43. https://doi.org/10.20965/jdr.2011.p0036
  17. Shrestha, K.C., Nagae, T. and Araki, Y. (2011b), "Finite element study on pinning retrofitting technique of masonry walls with opening subjected to in-plane shear load", ACEE- J., 4(4), 81-96.
  18. Shrestha, K.C., Araki, Y., Nagae, T., Omori, T., Sutou, Y., Kainuma, R. and Ishida, K. (2011c), "Applicability of Cu-Al-Mn shape memory alloy bars to retrofitting of historical masonry constructions", Earthq. Struct., 2(3), 233-256. https://doi.org/10.12989/eas.2011.2.3.233
  19. Shrestha, K.C., Araki, Y., Nagae, T., Omori, T., Sutou, Y., Kainuma, R. and Ishida, K. (2013), "Effectiveness of superelastic bars for seismic rehabilitation of clay-unit masonry walls", Earthq. Eng. Struct. Dyn., 42(5), 725-741. https://doi.org/10.1002/eqe.2241
  20. Takiyama, N., Nagae, T., Maeda, H., Kitamura, M., Yoshida, N. and Araki, Y. (2008), "Cyclic out-of-plane flexural behavior of masonry walls rehabilitated by inserting steel pins", Proceedings of 14th World
  21. Conference on Earthq. Eng., Beijing, China, October. Willis, C.R., Seracino, R. and Griffith, M.C. (2010), "Out-of-plane strength of brick masonry retrofitted with horizontal NSM CFRP strips", Eng. Struct., 32(2), 547-555. https://doi.org/10.1016/j.engstruct.2009.10.015

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