Materiales de Construcción, Vol 58, No 289-290 (2008)

Laser heating: a minimally invasive technique for studying fire-generated heating in building stone


https://doi.org/10.3989/mc.2008.v58.i289-290.82

Miguel Gómez-Heras
School of Geography, Archaeology & Palaeoecology, Queen’s University Belfast, United Kingdom

Rafael Fort
Instituto de Geología Económica (CSIC-UCM), Madrid, Spain

Miguel Morcillo
Centro Tecnológico Laser, Universidad Politécnica de Madrid, Spain

Carlos Molpeceres
Centro Tecnológico Laser, Universidad Politécnica de Madrid

José Luis Ocaña
Centro Tecnológico Laser, Universidad Politécnica de Madrid, Spain

Abstract


Due to the irreparable damage it can cause, fire is one of the major risks to buildings. Recent studies on the effects of fire tend to focus on micro-scale analysis, addressing questions such as micro-cracking or mineralogical or chemical changes that are particularly relevant to listed buildings.
The fire simulation techniques employed to date (convection heating laboratory furnaces and real flame tests) are subject to a series of limitations including non-repeatability, the lack of combustion by-products and, most importantly, the need to work with large samples. In this final context, techniques must be found that require only minimal sample sizes.
This paper introduces laser irradiation as a technique suitable for simulating the “combustion” of building materials, since it mimics the physics of fire, is repeatable, yields combustion products and, most importantly, can be applied to small specimens. Indeed, as laser irradiation concentrates high amounts of energy in small areas, it can be used for micro-scale testing.

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References


[1] Goudie, A.S., Allison, R.J. & McLaren, S.J.: “The relations between modulus of elasticity and temperature in the context of the experimental simulation of rock weathering by fire”, Earth Surf. Proc. Land., 17 (1992), pp. 605-615. doi:10.1002/esp.3290170606

[2] Allison, R.J. & Goudie, A.S.: “The effects of fire on rock weathering: An experimental study”, in: D.A. Robinson y R.B.G. Williams (eds.), Rock Weathering and Landform Evolution. Wiley, Chichester, 1994, pp. 41-56.

[3] Chakrabarti, B., Yates, T. & Lewry, A.: “Effect of fire damage on natural stonework in buildings”. Constr. Build. Mater., 10(7) (1996), pp 539-544. doi:10.1016/0950-0618(95)00076-3

[4] Hajpál, M.: “Changes in Sandstones of Historical Monuments Exposed to Fire or High Temperature”, Fire Technol., 38(4) (2002), pp 373-382. doi:10.1023/A:1020174500861

[5] Hajpál, M.: “Effect of Fire Damage of Sandstones in Laboratory Conditions”, in: L. Aires-Barros, F. Zezza, A. Dionisio & M. Rodrigues (eds.), Influence of the Environment and Defense of the Territory on Recovery of Cultural Heritage. Lectures and Proceedings of the 6th International Symposium on the Conservation of Monuments in the Mediterranean Basin, Lisboa, 2004, pp. 267-272.

[6] Hajpál, M. & Török, A.: “Mineralogical and colour changes of quartz sandstones by heat”, Environ. Geol., 46 (2004), pp. 311-322.

[7] Gomez-Heras, M., Hajpál, M., Álvarez de Buergo, M., Török, A., Fort, R., & Varas, M.J.: “Evolution of porosity in Hungarian building stones after simulated burning”. in: R. Fort, M. Álvarez de Buergo, M. Gomez-Heras & C. Vazquez-Calvo (eds.), Heritage Weathering and Conservation HWC-2006. Taylor & Francis, Rotterdam, (2006), pp. 513-519.

[8] McCabe, S., Smith, B.J. & Warke, P.A.: “Preliminary observations on the impact of complex stress histories on the response of sandstone to salt weathering: laboratory simulations of process combinations”, Environ. Geol., 52 (2007), pp. 251-258. doi:10.1007/s00254-006-0531-7

[9] McCabe, S., Smith, B.J. & Warke, P.A.: “A legacy of mistreatment: understanding the decay of medieval sandstones in NE Ireland”, Build. Environ., In press.

[10] McCabe, S., Smith, B. J. & Warke, P. A.: “Sandstone response to salt weathering following simulated fire damage: a comparison of the effects of furnace heating and fire”. Earth Surf. Proc. Land., 32 (2007), pp. 1874-1873. doi:10.1002/esp.1503

[11] Ollier, C.D. & Ash, J.E.: “Fire and rock breakdown”. Zeitschr. Geomorphologie N. F., 27(3) (1983), pp. 363-374.

[12] Yuen, W.W. & Chow, W.K.: “The role of thermal radiation on the initiation of flashover in a compartment fire”. Int. J. Heat Mass Tran., 47(19-20) (2004), pp. 4265-4276. doi:10.1016/j.ijheatmasstransfer.2004.05.017

[13] Yuen, W.W. & Tien, C.L.: “A simplified calculation scheme for the luminous flame emissivity”, In: Proceeding of the 16th Symposium (International) of Combustion, Combustion Institute, Pittsburgh (1976), pp. 1481–1487

[14] Gómez-Heras, M., Varas, M.J., Alvarez de Buergo, M. & Fort, R.: “Characterization of changes in matrix of sandstones affected by historical fires” in: D. Kwiatkowski & R. Löfvendahl (eds.), 10th International Congress on Deterioration and Conservation of Stone, Stockholm (2004), pp. 561-568.

[15] Gómez-Heras, M.: Procesos y formas de deterioro térmico en piedra natural del patrimonio arquitectónico. Madrid: UCM, Servicio de Publicaciones, 2006. http://www.ucm.es/BUCM/tesis/geo/ucm-t28551.pdf Last access 15/10/07

[16] Warke, P.A. & Smith, B.J.: “Effects of direct and indirect heating on the validity of rock weathering simulation studies and durability tests”. Geomorphology, 22(3-4) (1998), pp. 347-357. doi:10.1016/S0169-555X(97)00078-0

[17] Gómez-Heras M, Smith BJ, & Fort R: Surface temperature differences between minerals in crystalline rocks: implications for granular disaggregation of granites through thermal fatigue. Geomorphology 78(3-4) (2006), pp. 236-249. doi:10.1016/j.geomorph.2005.12.013

[18] Gomez-Heras, M., Álvarez de Buergo, M., Varas, M.J., Fort, R., Morcillo, M. & Molpeceres, C.: “Fire damage of heritage building stones: methodological considerations on current research”, in: G. Mileva & M. Hristova (eds.), Built Heritage: Fire Loss to Historic Buildings, SKALA, Varna (2006), pp. 132-141.

[19] Buj, O & Gisbert, J.: “Petrophysical characterization of three commercial varieties of Miocene sandstones from the Ebro valley”, Mater. Construcc vol 57, nº 287 (2007), pp. 63-74.




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