Nilai CBR Agregat Laterit Exs.Makroman Dengan Penambahan Tanah Pilihan Sebagai Material Lapis Pondasi Bawah (LPB)

Abstract

From the results of the CBR test, only one variation of the mixture qualifies as a bottom foundation layer material, namely with a 20% soil mixture who’s minimum CBR value is 60%. Furthermore, the test was carried out combined with the hammer aggregate with composition (laterite aggregate 35%, hammer aggregate 50%, soil 15%) obtained a CBR value of 78% with a value of Gs = 2,748 gr / cc, γd max = 1.667 gr / cm3, at Wopt = 17.02%. In the composition (laterite aggregate 25%, hammer aggregate 50%, soil 25%) obtained a CBR value of 96% with a value of Gs = 2.748 gr / cc, γd max = 1.702 gr / cm3, in Wopt = 18.02%. While in the composition (laterite aggregate 20%, hammer aggregate 60%, soil 20%) obtained a CBR value of 88% with a value of Gs = 2.748 gr / cc, γd max = 1,740 gr / cm3, in Wopt = 16.02%. So that the CBR value meets the lower foundation layer material standard, where the minimum CBR standard is 60%.

Dari hasil pengujian CBR hanya satu variasi campuran yang memenuhi syarat sebagai material lapis pondasi bawah yaitu dengan campuran tanah 20% yang nilai CBR minimumnya 60%. Selanjutnya dilakukan pengujian dikombinasikan dengan agregat palu dengan komposisi (agregat laterit 35%, agregat palu 50%, tanah 15%) diperoleh nilai CBR sebesar 78% dengan nilai Gs = 2,748 gr/cc, γd max = 1,667 gr/cm3, pada Wopt = 17,02%. Pada komposisi (agregat laterit 25%, agregat palu 50%, tanah 25%) diperoleh nilai CBR sebesar 96% dengan nilai Gs = 2,748 gr/cc, γd max = 1,702 gr/cm3, pada Wopt = 18,02%. Sedangkan pada komposisi (agregat laterit 20%, agregat palu 60%, tanah 20%) diperoleh nilai CBR sebesar 88% dengan nilai Gs = 2,748 gr/cc, γd max = 1,740 gr/cm3, pada Wopt = 16,02%. Sehingga nilai CBR memenuhi standar material lapis pondasi bawah, dimana standar CBR minimumnya sebesar 60%.