Sains Malaysiana 43(2)(2014): 295–302

Single Face Compaction on Laboratory Marshall Specimen towards Satisfactory

Degree of Compaction and Thickness

(Pemadatan Satu Permukaan Spesimen Marshall untuk Mencapai Darjah

Pemadatan dan Ketebalan yang Memuaskan)

2HARYATI YAACOB, 2MOHD ROSLI HAININ & FUNG-LUNG CHANG*1

1Faculty of Civil Engineering, Universiti Teknologi Malaysia

81300, UTM Skudai, Johor Bahru, Malaysia

2Faculty of Civil Engineering, Department of Geotechnics and Transportation

Universiti Teknologi Malaysia, 81300, UTM Skudai, Johor Bahru, Malaysia

Diserahkan: 6 Januari 2013/Diterima: 18 Mei 2013

ABSTRACT

Investigation on the performance of bond strength between pavement layers has gain serious attention from researchers worldwide. Typical methods to prepare the double layered testing specimen at laboratory scale is to follow the Marshall procedure or to perform coring on constructed field scale test lanes. For specimen prepared with Marshall procedure, binder course loose mix is compacted at double faces first prior to the application of wearing course loose mix in the compaction mould and perform the compaction of the loose wearing course later. This paper focused on the specimen prepared using Marshall procedure where the upper wearing course is subjected to single face compaction. The feasibility of single face compaction is investigated and the relevant amount of compaction blows is determined to achieve sufficient thickness and degree of compaction. Aggregate is proportioned to achieve a target thickness of 35, 50 and 65mm, at an allowable limit of ±1 mm. For the tested mix incorporating dense graded, open graded and gap graded mix, each mix managed to achieve the required degree of compaction at satisfactory thickness with respective compaction blows.

Keywords: Degree of compaction; double layer; single face compaction; thickness

ABSTRAK

Penyelidikan terhadap prestasi kekuatan ikatan antara lapisan asfal telah mendapat perhatian yang serius daripada para penyelidik di seluruh dunia. Kaedah yang sering digunakan untuk menyediakan spesimen uji kaji berlapis dua pada skala makmal adalah mengikut kaedah Marshall atau pun melalui proses penerasan dalam lapangan uji kaji bagi mendapatkan spesimen berskala lapangan. Untuk spesimen yang disediakan dengan kaedah Marshall, campuran longgar lapisan pengikat akan dipadatkan pada kedua-dua permukaan sebelum campuran longgar lapisan haus diaplikasikan dan dipadatkan pada satu permukaan sahaja. Makalah ini fokus kepada penyediaan spesimen dengan kaedah Marshall dengan lapisan haus dipadatkan pada satu permukaan sahaja. Kemungkinan perlaksanaan pemadatan pada satu permukaan sahaja dikaji dan jumlah pemadatan yang diperlukan untuk mencapai ketebalan dan darjah pemadatan yang mencukupi dikenal pasti. Agregat disediakan pada kuantiti yang tertentu untuk mencapai ketebalan 35, 50 dan 65 mm, dengan batas yang diizinkan ±1 mm. Untuk setiap jenis campuran yang diuji, setiap campuran berupaya untuk mencapai darjah pemadatan yang disasarkan berserta ketebalan yang memuaskan dengan jumlah pemadatan seperti yang dikenal pasti.

Kata kunci: Darjah pemadatan; ketebalan; lapisan dual; pemadatan satu permukaan

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*Pengarang untuk surat-menyurat; email: flchang87@hotmail.com