Sains Malaysiana 42(6)(2013): 783–793

CCorrection of Compliance Errors in the Dynamic Shear Modulus

of Bituminous Binders Data

(Pembetulan Ralat Pematuhan dalam Data Modulus Ricih Dinamik Pengikat Berbitumen)

Jiantao Wu

College of Civil Engineering and Transportation

Hohai University, 1 Xikang Road, Nanjing, Jiangsu Province

210098 China

Nur Izzi Md. Yusoff*

Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Fauzan Mohd Jakarni

Department of Civil Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor

Mohd Rosli Hainin

Faculty of Civil Engineering and Construction Research Alliance, Universiti Teknologi Malaysia

81310 Skudai, Johor, Malaysia

Received: 19 June 2012/Accepted: 15 October 2012

ABSTRACT

The dynamic shear rheometer (DSR) is one of the most complex and powerful instruments currently used to characterise the linear viscoelastic (LVE) rheological properties of bituminous binders. However, the DSR also has its limitations in that the measured complex modulus data are exposed to errors, known as compliance (testing) errors, particularly at low temperatures and/or high frequencies. This study was conducted to investigate the validity of equations developed by Schröter and associates on complex modulus data collected using the DSR. The equations used were originally developed based on the calibration of the advanced rheometric expanse system (ARES) rheometer. It was found that those equations are able to satisfactorily correct the data on unmodified bitumens and unaged bitumen-filler mastics, including unaged and aged samples. Similar results were also observed for storage and loss moduli master curves. Finally, the 2S2P1D Model was used to calibrate the corrected complex moduli data and it was found that the model satisfactorily simulates the rheological properties of tested samples.

Keywords: Bitumen-filler mastic; compliance errors; linear viscoelastic; modelling; unmodified bitumen

ABSTRAK

Reometer ricih dinamik (DSR) adalah salah satu alat yang rumit dan berkuasa yang kini digunakan untuk mencirikan sifat reologi likat kenyal lelurus (LVE) bahan pengikat berbitumen. Walau bagaimanapun, DSR juga mempunyai batasan dengan data modulus kompleks yang diukur terdedah kepada ralat, yang dikenali sebagai kesilapan pematuhan (ujian), terutamanya pada suhu rendah dan/atau frekuensi tinggi. Kajian ini telah dijalankan untuk menyiasat pengesahan penggunaan persamaan yang dibangunkan oleh Schröter dan sekutu terhadap data kompleks modulus yang dikumpul menggunakan alat DSR. Persamaan yang digunakan pada asalnya dibangunkan berdasarkan penentukuran reometer advanced rheometric expanse system (ARES). Didapati bahawa persamaan tersebut dapat membetulkan data-data bitumen tidak terubah suai dan mastik-pengisi bitumen secara memuaskan, termasuk sampel yang tidak dan mengalami penuaan. Keputusan yang sama juga diperhatikan terhadap lengkuk utama modulus penyimpanan dan modulus kehilangan. Akhirnya, Model 2S2P1D telah digunakan untuk tujuan penentukuran data kompleks modulus yang diperbetulkan dan didapati bahawa model ini dapat mensimulasi sifat reologi sampel yang diuji dengan memuaskan.

Kata kunci: Bitumen tidak diubah suai; kesilapan pematuhan; likat kenyal lelurus; mastik-terisi bitumen; permodelan

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*Corresponding author; email: izzi@eng.ukm.my