PENGARUH RENDAMAN MORTAR DENGAN MENGGUNAKAN AIR LAUT DAN AIR TAWAR TERHADAP KUAT TEKAN, ABSORPSI, DAN POROSITAS

In Indonesia the use of mortar is very popular, where in bulding construction it is always used, but in the process sometimes people are not quite right in making mixtures for mortar. So that the result obtained are not optimal, that is, cracks will appear on the walls during manufacture and after manufacture. The purpose of this study was to determine the effect of the precentage of immersion in seawater and fresh water on the absorption, porosity, and compressive strength of mortar. The variables used are the cemen water factor and the precentage of mortar immersion using seawater and fresh water. The result showed that the lowest porosity value was found at a water cement factor of 0,40 at a percentage of 10%, while the highest porosity at a water cement factor of 0,40 was at a percentage of 80%. For the lowest porosity value at a water cement faktor of 0.60 there is percentage of 40%, while the highest porosity at a water cement factor of 0,60 is at percentage of 70%. The lowest absorption value for motar is at a water cement factor of 0,40 at percentage of 10%, while the highest absorption value at a water cement factor at 0,40 is at a percentage of 30%, for the lowest absorption value at a water cement factor of 0,60 is at a percentage of 20%, for the lowest absorption value at a water cement factor of 0,60 is at a percentage of 10%. The highest compressive strenght value at 28 days at a water cement factor of 0,40 was found at a percentage of 30% 17.6 Mpa, while the lowest compressive strenght value was at a water cement factor of 0,40 at 28 days at a percentage of 100% 9 Mpa. The highest compressive strenght value at the age of 28 days at a water cement factor of 0,60 is found at a percentage of 50% 15.6 Mpa, the lowest compressive strenght value at a water cement factor of 0,60 is at a percentage of 100% 11.9 Mpa.