Rebound Hammer Test result of old repaired masonry wall using premixed mortar additive in tidal flooding prone area

The coastal areas of Java, especially Semarang and Demak, are tidal flooding-prone areas. In fact, tidal flooding decreases the quality of life in coastal areas due to the capacity of seawater in destroying the building, houses, and environment. One innovation is introduced in this paper, which is the premixed mortar additive to repair masonry walls of house in tidal-prone areas. Principally, some measures should be done to address the problems caused by tidal flooding. In this research, masonry walls were improved by applying premixed mortar additive. The results were investigated after its long term performance, for more than one year, by using non destructive Rebound Hammer Test. This research was conducted by experimental activity. There were two masonry walls that had been repaired about a year ago. Some old masonry and concrete bricks of the walls had been substituted by new concrete bricks made of polymer-modified mortar with Moringa oleifera and Gracilaria Sp. and then covered by premixed mortar a...