Materiales de Construcción, Vol 65, No 317 (2015)

The influence of temperature in a capillary imbibition salt weathering simulation test on Mokattam limestone


https://doi.org/10.3989/mc.2015.00514

N. Aly
Suez University - Instituto de Geociencias (CSIC, UCM), Egypt

M. Gomez–Heras
Instituto de Geociencias (CSIC, UCM) - CEI Campus Moncloa (UPM, UCM, CSIC) - Universidad Politécnica de Madrid, Spain

A. Hamed
Suez University, Egypt

M. Álvarez de Buergo
Instituto de Geociencias (CSIC, UCM), Spain

F. Soliman
Suez Canal University, Egypt

Abstract


Limestone is one of the most frequent building stones used in monuments in Egypt from ancient Egyptian times and salt weathering is one of the main threats to these monuments. During this work, cylindrical limestone samples (2 cm diameter and approx. 4 cm length) from Mokattam group, one of the most frequent materials in historic Cairo, were subjected, in a purpose-made simulation chamber, to laboratory salt weathering tests with a 10% weight NaCl solution at different temperatures (20, 30, 40 °C). During each test, temperature was kept constant and salt solutions flowed continuously imbibing samples by capillary rise resembling the way they get into building stone in many real cases. Air temperature, relative humidity inside the simulation chamber and also samples weight were digitally monitored and recorded. Results show the influence of temperature and the ratio between imbibitions and evaporation on the dynamics of salt crystallization in the samples.

Keywords


Stone decay; Salt weathering; Limestone; Durability

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