SHEAR BEHAVIOUR OF REINFORCED CONCRETE USING

POLYETHYELENE TEREPHATHALATE (PET) BOTTLES AS FINE

AGGREGATE

MOHD KHAIRIL ANNAS BIN MAHAMAD

A thesis is submitted in

fulfillment of the requirement for the award of

Master Degree of Civil Engineering

Faculty of Civil and Environmental Engineering

Universiti Tun Hussein Onn Malaysia

JULY 20 14

ABSTRAK

Perrnintaan tinggi terhadap penggunaan botol polyethylene terephthalate (PET) telah

menjadikannya sebagai salah satu bahan buangan utama oleh pengguna. Kuantiti

bahan buangan yang tinggi ini tidak boleh dilupuskan begitu sahaja, namun, impak

bahan buangan ini terhadap alam sekitar dapat dikurangkan dengan menjadikannya

sebagai salah satu bahan lestari pada industri pembinaan; di mana ianya dapat

dijadikan sebagai aggregate ringan. Dalam kajian ini, sifat ricih konkrit bertetulang

mengandungi aggregate PET dengan menggunakan konfigurasi beban dua tumpu

telah dijalankan. Ujian penentuan sifat konkrit pada setiap nisbah 0%, 25%, 50% dan

75% penggantian aggregate PET terlebih dahulu ditentukan sebelum ciri-ciri struktur

konkrit dikaji. Seperti jangkaan, keputusan ujian sifat bahan konkrit yang meliputi

ujian kekuatan mampatan, ujian belahan silinder dan ujian modulus elastic adalah

menurun. Ujian kekuatan mampatan menurun sebanyak 29%, 47% dan 52% bagi

nisbah penggantian 25%, 50% dan 75%. Ujian belahan silinder pula menurun

sebanyak 12%, 33% dan 44% bagi nisbah penggantian aggregate PET sebanyak

25%, 50% dan 75%. Di samping itu juga, penurunan sebanyak 15%, 28% dan 38%

bagi setiap 25% peningkatan nisbah penggantian aggregate PET telah dicatatkan

pada ujian modulus elastik. Meskipun mencatatkan penurunan, salah satu kelebihan

menggunakan aggregate PET sebagai bahan ganti bagi aggregate semula jadi adalah

pengurangan ketumpatan konkrit. Bagi nisbah penggantian 50% dan ke atas,

ketumpatan konkrit jatuh pada kategori konkrit ringan berdasarkan klasifikasi

daripada AC12 13R-03. Uj ian struktur rasuk menunjukkan bahawa konkrit

bertetulang yang mengandungi aggregate PET menunjukkan sifat yang sama seperti

konkrit normal dengan perbezaan darjah prestasi pada parameter yang di uji. Selepas

itu, daya ricih ujian yang diperolehi daripada ujian struktur rasuk di bandingkan

dengan daya ricih teori yang dihitung dengan menggunakan kaedah yang

diperuntukkan oleh BS8110, ACI 3 18R-02 dan Eurocode 2 di mana Eurocode 2

memberikan nilai yang hampir dengan nilai experiment.

ABSTRACT

The higher demand of using polyethylene terephthalate (PET) bottles has made it

one of the major wastes generated by consumer. The large quantities of this waste

cannot be eliminated, however, the impact of the waste to the environment can be

reduced by changing it to a sustainable material in construction industries; where it

can be evaluated as lightweight aggregate. On this study, the shear behviour of

reinforced concrete contining PET aggregate using two point load configuration was

done. Prior to investigate the structural behaviour, the concrete physical and

mechanical properties for each 0%, 25%,50% and 75% of PET aggregate

replacement ratio was determined. As expected, the result of materials properties

which comprises of compressive strength test, split tensile strength and modulus of

elasticity (MOE) were decreased. The compressive strength decreased by 29%, 47%

and 52% for the replacement ratio of 25%, 50% and 75% respectively. Split tensile

strength also represent a 12%, 33%, 44% declination for each 25%, 50% and 75%

replacement of PET aggregate respectively. Furthermore, 15'76, 28% and 38%

decreasing for each 25% increment of PET aggregate were recorded for MOE test.

Despite all the reduction, one of the advantages of using PET aggregate as a

replacement for natural fine aggregate are the reduction of its density. For

replacement ratio of 50% and above, the density of the concrete fall into the

classification of lightweight concrete based on the requirement by ACI2 13R-03.For

structural beam test, it is shown that the reinforced concrete containing PET

aggregate behave in fundamentally the same manner as its normal weight concrete

with the difference in the performance of the parameter being tested. After that, the

experimental shear force were compare to the theoretical shear force compute by

BS8 1 10, ACI 3 18R-02 and Eurocode 2 where Eurocode 2 give a closer prediction to

the experimental result.

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