Pengaruh Air Rob Terhadap Struktur Bangunan Tua

Ex. Mega Eltra Building is the one of conservation building in Semarang, the building was constructed in around 1857 – 1860 and has undergone severe structural damage due to environmental effects, land subsidence and weatherworn. But, seawater attack to material degradation especially concrete strength is the concern in this study. Land subsidence in old city of Semarang makes buildings experience descend on the foundations, even it often comes to under the around ground level that makes building submerged. Water puddle in the building which has content salinity, chloride and sulphate can make bring down the concrete strength through capillarity and direct contact to air contaminated chloride and sulphate. Three locations of concrete column at 1st and 2nd floor were bored with 50 mm drill bit until more less 225 mm depth from column surface. The 225 mm bore logs were cut to be three specimens represents outer, middle and inner part, further the specimens were tested to determine the concrete compressive strength. The result of compressive strength test shows that concrete strength at 2nd floor is better than 1st floor, and concrete strength at outer part is lesser than middle part, and middle path is lesser than inner part. Concrete strength degradation due to chloride and sulphate contamination may occur through air contact and capillarity. The effect of seawater to concrete strength degradation through capillarity is 23,51 % and degradation through air contact for 1 st floor is 210 % higher than 2 nd floor.