ANALISIS PENAMBAHAN PASIR DAN SEMEN TERHADAP NILAI CBR TANAH DASAR DESA SUKODADI KABUPATEN LAMONGAN

Soil is a factor that can affect the structure of road construction. The CBR value is one of the parameters to determine the bearing capacity of the soil, if the CBR value is high then the soil bearing capacity is good, while if the CBR value is low then the soil needs to be stabilized. The purpose of this thesis is to determine the characteristics of the soil, determine the CBR value of the soil before and after stabilization, develop an implementation method and budget plan for the stabilized earthwork. This research includes water content test, density test, specific gravity test, grain analysis with hydrometer, limit Atterberg test, compaction test (modified), and CBR test (modified, soaked-unsoaked). In this test, variations of the addition of sand and cement were 5%, 10%, 15%, 20%, and 25% of the dry weight of the soil, respectively. From the test results, showing soil classification according to AASHTO A-7-6 with a value of soaked CBR 2.98%. Variations addition of sand and cement by 5% is used as a soil stabilization with the value of soaked CBR 26.31%. Stabilization work using Soil Stabilizer/Pulvi Mixer, Watertank Truck, Motor Grader, Vibro Roller, Sheepfoot Roller, Dump Truck, etc. with a Budget Plan of IDR. 6,505,291,980 (Six Billions Five Hundred Five Millions Two Hundred Ninety One Thousands Nine Hundred Eighty Indonesian Rupiahs) .