iifp wordpress com 2012-11-04 deskripsi pemadatan tanah dan california bearing ratio

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deskripsi pemadatan tanah dan

california bearing ratioPosted: November 4, 2012 in peat soil

Tags: california bearing ratio, CBR, dial reading, kalibrasi, kerapatan tanah, load, pemadatan, piston,

proctor, subgrade jalan

0

Sumber: Skripsi Fakultas Teknik Universitas Indonesia “Pengaruh Penggunaan Mikroorganisme Sebagai Bahan

Stabilisasi Terhadap Kekuatan Tanah Gambut Dengan Uji Triaksial dan CBR”, Penulis: Aditiya Putra Karisma,

Halaman: 17-19

Menurut Craig (1991), pemadatan tanah adalah proses naiknya kerapatan tanah dengan memperkecil jarak

antarpartikel sehingga ter jadi reduksi udara. Uji l aboratorium dikembangkan oleh R.R. Proctor tahun 1920-an dan

berikut elemen-elemen uji pemadatan standar tersebut pada tabel 2.11. Untuk keperluan subgrade jalan digunakan

nilai CBR sebagai indikator. Nilai CBR adala h perbandingan antara kekuatan sampel tanah dengan kepadatan tertentu

dan kadar air tertentu terhadap kekuatan batu pecah bergradasi rapat sebagai material dengan nilai CBR = 100. Untuk

mencari nilai CBR dipakai rumus:

dengan Standard Unit Load pada harga-harga penetrasi pada tabel

2.12. Beban (load ) didapat dari hasil pembacaan dial penetrasi yang kemudian dikorelasikan dengan grafik Calibration

Prooving Ring .

dimana:

A = luas piston

M = dial reading

LRC = faktor kalibrasi

Semakin besar nilai CBR berarti kemampuan tanah untuk menahan lalu lintas di atasnya semakin besar. Berikut

adalah kategori nilai CBR terhadap kekuatan subgrade jalan yang d iklasifikasikan dalam Guide Highways

Maintenance (2000) pada tabel 2.13.

Tabel 2.11 Elemen-Elemen Uji Pemadatan Standar

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Sumber: ASTM D698 dan ASTM D1557

Tabel 2.12 Standard Unit Load

Sumber: ASTM D698 dan ASTM D1557

Tabel 2.13 Nilai CBR terhadap Kekuatan Subgrade Jalan

Sumber: Guide to Highways Maintenance (2000)

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