ブックタイトル「煉瓦造建造物の保存と修復」英語版

概要

「煉瓦造建造物の保存と修復」英語版

? Efflorescencephoto 2-10 Brick wall surface with efflorescenceEfflorescence supposedly caused by water seeping betweenthe stone part and brick wall.・EfflorescenceEfflorescence is caused by waterinfiltration, as with salt damageand freeze-thaw damage (figure2-3). When water that had enteredthe bricks evaporates, the limecomponent (calcium carbonate, etc.)dissolved in the water is left behindand forms efflorescence. Whenefflorescence is left untouchedfor a long time, lime particles willstrongly adhere itself to the bricksurface, making it very difficult toremove by hand, resulting in wallsoiling (photos 2-10, 2-11) fn 6 .iwater infiltration・Areas prone to efflorescencephoto 2-11 Efflorescence on the surface of replaced bricksdue to deterioration or damage.Efflorescence occurs where wateris discharged and thus is oftenseen on brick joints and spacesbetween brick and stone masonryelements. Also, because this occursas water in the material evaporates,it tends to appear on the south sidewhere there is a large fluctuation inhumidity.dryingfigure 2-3efflorescenceFlow chart of efflorescence? Metal corrosion in brick wallsDamage due to metal corrosion occurs when water andoxygen entering the brick react with embodied metalelements (bolts for attaching machinery or structuralreinforcement including steel plates and reinforcement bars)and cause corrosion; volume expansion of rust then createscracks on the wall surface (photos 2-12, 2-13)photo 2-12wall.Deterioration crack due to corrosion of a of metal bolt in the brickphoto 2-13 Initial stage of metal corrosionRust run off can be seen from corroding metal hinge inside the wall. With theprogress of corrosion, cracks may appear in the wall to which the hinge isattached.85