The analysis of mortar concrete with the variety of sands in jepara (keling sand, bangsri sand) using strong pressure method

Along with the increasing of infrastructure development in Indonesia especially in jepara, so the necessary of material also increase, for example: sand. Nowadays, muntilan is the sand that often be used in making infrastructure in the government because it is considered that it has the good quality, whereas in the other hand the river sand is also abundant, but the government perverted mintilan sand as the development material. River sand is usually used by the middle to lower county because the house because the price is cheaper than muntilan sand. After doing this research we hope that: can know the quality of the river sand if it is used in infeastructure, knowing the river sand in jepara that have the good quality, such as: keling sand, bangsri sand, The stages of this research are: preparation, sand inspection (mud content and organic faces, filter analysis, moister content and weight, and specific gravity), making spacimens based on SKSNI 03-6825-2002 ASTM C 305, making compressive strength test. The test result show that at 3,7,14,21,28 days old show that keling sand (93,2 kg/cm2), bangsri sand (135,2 kg/cm2). The use of river sand as the construction material by the government and community will have consequence on the balance kf muntilan sand and river sand. The specific treatment on the river sand will that quality that is almost same as muntilan sand.