Laboratory Investigation Into The Durability Of Joint Re-pointing In Brick Masonry Damaged By ...

Summary

Salt crystallisation tests were carried out on brick specimens to assess the effect of different repointing mortars.  Efflorescence and crypto-efflorescence due to crystallisation of soluble salts in walls are some of the most frequent causes of damage to facing brickwork in Mediterranean countries.  Mortar joints are the most affected in the case of historic masonry.  When rain penetration is the only cause of moisture, effective repair can be carried out by re-pointing. Nevertheless, there might  be the possibility that non-compatible mortars are chosen and/or that the workmanship is very poor.  The tests were carried out within the framework of an EC Contract (CEE ENV4-CT98-0706), according to RILEM Recommendations.  The long term damage caused by the salts was detected by visual inspection, photographic survey and measured by a laser profilometer.  The bond between the re-pointing and the bricks was also assessed using the bond wrench test.  15 refs.

Primary author(s): Cardani G; Tedeschi C; Binda L; Baronio G

                            Milan,Polytechnic

Source: Masonry (9). Proc.6th Int.Masonry Conf.

            London,4-6 November 2002,p.65-72

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