Kajian ini telah dijalankan untuk mengaitkan ketumpatan kering maksimum (MDD)
terhadap parameter lain kandungan iaitu optimum kelembapan (OMC), diameter yang
lulus pada 50% (D50), had cecair, (LL), had plastik (PL), keplastikan indeks, (PI), pekali
keseragaman, (Cu) dan pekali penggredan, (Cc) 33 laterit sampel diperoleh daripada
Bandar Baharu, Bukit 300, Relau dan Sungai Kechil . Data yang diambil merupakan
daripada repositori Pusat Pengajian Kejuruteraan Awam, USM, berdasarkan ujian yang
telah dijalankan sebelum ini. Lima lagi sampel telah diambil dari Bandar Baharu, yang
dikategorikan mengikut jenis kumpulan tanah iaitu jenis tanah SC dan SM. Seterusnya
sampel ini akan diuji untuk parameter yang sama seperti diatas. Data yang baru
digabungkan bersama data daripada repositori USM dan digunakan dalam korelasi. Ujian
dijalankan ke atas sampel tanah telah merangkumkan had Atterberg, analisis ayak, dan
Proktor yang diubahsuai. Korelasi telah ditubuhkan melalui persamaan linear daripada
analisis regresi. Berdasarkan korelasi, MDD muncul menanggung hubungan yang baik
dengan OMC dengan R² bersamaan dengan 0.836. Korelasi lain memberikan keputusan
berikut mengikut nilai kolerasi yang tertinggi disebut dahulu: MDD vs PL (R2 = 0.419),
MDD vs D50 (R2 = 0.306), MDD vs MDD vs Cu (R2 = 0.272), MDD vs PI (R2 = 0.137),
MDD vs LL (R2 = 0.074) dan MDD vs Cc (R2 = 0.020). Parameter juga dikaitkan kepada
OMC dan keputusan berikut diperolehi mengikut nilai tertinggi OMC iaitu OMC vs MDD
(R2 = 0.487), OMC vs PL (R2 = 0.388), OMC vs Cu (R2 = 0.306), OMC vs D50 (R
2 =0.239), OMC vs LL (R2 = 0.187), OMC vs Cc (R2 = 0.304) dan OMC vs PI (R2 = 0.023).
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This study was carried out to relate the Maximum Dry Density (MDD) against
other parameters namely Optimum Moisture Content (OMC), Mean Diameter (D50),
Liquid Limit, (LL), Plastic Limit, (PL), Plasticity Index, (PI), Coefficient of Uniformity,
(Cu) and Coefficient of Gradation, (Cc) of 33 laterites samples sourced from Bandar
Baharu, Kedah, Seberang Perai, Pulau Pinang, and Parit Buntar, Perak. The data were
extracted from the repository of the School of Civil Engineering, USM, based on tests
that have been carried out earlier. Five more samples were collected from Bandar Baharu,
labeled as according to the soil group which are SC and SM was then tested for the same
parameters as earlier considered. The new data were combined with those of USM
repository and used in the correlations. The tests carried out on the soil samples have
included the Atterberg limits, sieve analyses, and modified proctor test. The correlations
have been established by means of linear equations from regression analyses. Based on
the correlations, the MDD appeared to bear a good correlation with the OMC with R2
equals to 0.836. The other correlations gave the following results that was best mentioned
first: MDD vs PL (R2 = 0.419), MDD vs D50 (R2 = 0.306), MDD vs MDD vs Cu (R2 =
0.272), MDD vs PI (R2 = 0.137), MDD vs LL (R2 = 0.074) and MDD vs Cc (R2 = 0.020).
The parameters were also correlated to the OMC and the following results were obtained,
best mentioned first: OMC vs MDD (R2 = 0.487), OMC vs PL (R2 = 0.388), OMC vs Cu
(R2 = 0.306), OMC vs D50 (R2 = 0.239), OMC vs LL (R2 = 0.187), OMC vs Cc (R
2 =
0.304) and OMC vs PI (R2 = 0.023).
Correelations between maximum dry density with other parameters for laterite from northern region