Evaluation of Water Permeability in Fibre Reinforced Hydraulic Lime Mortar Intended for Conservation

Abstract:

Much of the existing water infrastructure across the world was constructed using masonry in the last 200 years and many of these structures were built with pre-Portland cement binders. Although these mortars exhibit good workability and high water retention in the plastic state, the water tightness deteriorates over the years resulting in a pressing need for suitable repair materials. The addition of polypropylene micorfibre in cement-based systems was found to be effective in reducing water permeability. But the effect of polymeric fibres on the permeability coefficient of hydraulic lime mortar (HLM) is unknown. Therefore, this paper focuses on measuring water permeability in fibre reinforced HLM. Besides, this study examined the application of nanolime onto the aforementioned mortars and its effect on their water permeability. Accordingly, a permeability cell was setup to monitor the onset of the steady state condition in fluid flow. Companion data was generated for the mechanical performance of these mortars. The results show that in hydraulic lime mortar, there is likely an optimal fibre dosage in order to reduce the permeability coefficient. Unlike with Portland cement mortar, this dosage is significantly lower. As well, applying nanolime was most beneficial in limiting water permeability in the natural hydraulic lime mortars.

• Periodical: Key Engineering Materials (Volume 711)
• Pages: 630-637
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.711.630
• Online since: September 2016
• Authors: Vivek Bindiganavile*, Md Toihidul Islam, Narayana Suresh
• Keywords: Hydraulic Lime Mortar, Nano-Lime, Polypropylene Fibre, Water Permeability

References

[1] A.H.P. Maurenbrecher, Mortars for repair of traditional masonry, National Research Council. NRCC-46903. 9(2) (2004) 62-65.

[2] A.H.P. Maurenbrecher, K. Trischuk, M.Z. Rousseau, M.I. Subercaseaux , Key considerations for repointing mortars for the conservation of older masonry, Institute for Research in Construction Research Report 225, National Research Council Canada, Ottawa, Canada. (2007).

[3] G.T. Suter, C.P. Borgal and K. Blades, Overview of mortars for Canadian historic structures, In proceedings of the 9th Canadian Masonry Symposium. University of New Brunswick, Canada. 4-6 June (2001).

[4] Z. Lafhaj, M. Goueygou, A. Djerbi and M. Kaczmarek, Correlation between porosity, permeability and ultrasonic parameters of mortar with variable water/cement ratio and water content, Cement and Concrete Research. 36(4) (2006) 625-633.

DOI: 10.1016/j.cemconres.2005.11.009

[5] M. Hoseini, Effect of Compressive Loading on Transport Properties of Cement-Based Materials, PhD thesis, The University of Alberta. (2013).

[6] P. D'Armada and E. Hirst, Nano-lime for consolidation of plaster and stone, Journal of Architectural Conservation, March 2012, 18(1): 63-80.

DOI: 10.1080/13556207.2012.10785104

[7] EN 459-2001, Building lime. Part 1: Definitions, specifications and conformity criteria. Part 2: Test methods, European standard available from the British Standards Institution. (2001).

[8] J. Lanas, J.L. Perez Bernal, M.A. Bellob and J.I. Alvarez Galindo, Mechanical properties of natural hydraulic lime based mortars, Cement and Concrete Research. 34(12) (2004) 2191-2201.

DOI: 10.1016/j.cemconres.2004.02.005

[9] A. Biparva, Permeability and durability of high volume fly ash concrete under an applied compressive stress, M.A. Sc. Thesis, The University of British Columbia. (2005).

[10] A. Izaguirre, J. Lanas and J.I. Alvarez, Effect of a polypropylene fibre on the behaviour of aerial lime-based mortars, Construction and Building Materials. 25 (2011) 992–1000.

DOI: 10.1016/j.conbuildmat.2010.06.080

[11] Banthia, N., Sappakittipakorn, M. and Jiang, Z. On permeable porosity in bio-inspired fibre reinforced cementitious composites,. International Journal of Sustainable Materials and Structural Systems, 2012, 1(1): 29-41.

DOI: 10.1504/ijsmss.2012.050451

[12] M.T. Islam, R. Chan and V. Bindiganavile, Stress rate sensitivity of stone masonry units bound with fibre reinforced hydraulic lime mortar, RILEM Materials and Structures. 45. 5 (2012): 765-776.

DOI: 10.1617/s11527-011-9796-8

[13] J. Musacchi and T.D. Gonçalves, Influence of nano-lime and nano-silica consolidants in the drying kinetics of three porous building materials, Department of Materials, National Laboratory of Civil Engineering, Lisbon. (2014).