Sains Malaysiana 43(2)(2014): 303–312

Effects of Geometrically Cubical Shaped Aggregate on the Engineering Properties

of Porous Asphalt

(Kesan Agregat Berbentuk Kubus Secara Geometri ke atas Sifat Kejuruteraan Asfalt Berliang)

M.O. HAMZAH*1, S.S. LO2, Z. YOU3, M.R. MOHD HASAN3 & N.H. ABDULLAH1

1School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus

14300 Nibong Tebal, Pulau Pinang, Malaysia

2Konsortium Malaysia, 25, Kenyalang Park Shopping Centre

P.O. Box 952, 93720 Kuching, Sarawak, Malaysia

3Department of Civil and Environmental Engineering, Michigan Technological University

1400 Townsend Drive, Houghton, MI 49931-1295, USA

Diserahkan: 6 November 2012/Diterima: 2 Mei 2013

ABSTRACT

Porous asphalt (PA) is predominantly made up of coarse aggregates. The coarse aggregate is instrumental in providing the strength and stability of the mix. The aggregate properties including shape is expected to greatly influence the performance of PA. In this study, five different proportions of geometrically cubical shaped (GCS) aggregate and normal shape aggregate combinations were introduced and designated as mix M0, M25, M50, M75 and M100. Further laboratory tests were carried out to determine the properties of PA including air voids, coefficient of permeability, abrasion loss, indirect tensile strength, resilient modulus and resistance to permanent deformation. The results obtained showed that mix M100 which consists of 100% GCS aggregate performed the best in all tests. Statistical analyses of one-way ANOVA and Duncan’s Post Hoc test results showed that the introduction of GCS aggregate has a significant effect on air voids, coefficient of permeability, abrasion loss and resistance to permanent deformation of the mixes. However, the results showed that GCS aggregate do not gave significant effect on indirect tensile strength and resilient modulus of the PA mixes tested.

Keywords: Abrasion loss; air voids; geometrically cubical aggregate; indirect tensile strength; permanent deformation; permeability; porous asphalt; resilient modulus

ABSTRAK

Asfalt berliang (PA) kebanyakannya terdiri daripada agregat kasar. Agregat kasar memainkan peranan penting dalam membekalkan kekuatan dan kestabilan campuran. Ciri agregat termasuk bentuk agregat, dijangka mempengaruhi prestasi campuran PA. Dalam kajian ini, lima peratusan kandungan berbeza agregat geometri berbentuk kubik (GCS) dan kombinasi agregat berbentuk normal telah dikaji dan dinamakan sebagai campuran M0, M25, M50, M75 dan M100. Ujian makmal telah dijalankan untuk menentukan sifat PA termasuk lompang udara, pekali kebolehtelapan, kehilangan lelasan, kekuatan tegangan tidak langsung, modulus kebingkasan dan rintangan terhadap ubah bentuk kekal. Keputusan yang diperoleh menunjukkan bahawa campuran M100 yang terdiri daripada 100% agregat GCS adalah yang terbaik bagi semua ujian yang dijalankan. Analisis statistik ANOVA sehala dan ujian Duncan Post Hoc menunjukkan bahawa agregat GCS memberikan kesan yang besar terhadap lompang udara, pekali kebolehtelapan, kehilangan lelasan dan rintangan kepada ubah bentuk kekal campuran PA. Walau bagaimanapun, keputusan menunjukkan bahawa agregat GCS tidak memberi kesan yang signifikan terhadap kekuatan tegangan tidak langsung dan modulus kebingkasan campuran PA yang diuji.

Kata kunci: Agregat berbentuk kubus secara geometri; asfalt berliang; kebolehtelapan, kehilangan lelasan; kekuatan tegangan tak langsung; modulus kebingkasan; rongga udara; ubah bentuk kekal

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*Pengarang untuk surat-menyurat; email: cemeor@eng.usm.my