KESAN KANDUNGAN ABU BAHAN API KELAPA SAWIT ULTRA-HALUS SEBAGAI PENGGANTI SIMEN TERHADAP PRESTASI KEBOLEHKERJAAN DAN MEKANIKAL KONKRIT AGREGAT KITAR SEMULA MAMPAT KENDIRI

MOHD ZULHAM AFFANDI BIN MOHD ZAHID, SITI SHUHADAH BINTI AZIZ

Abstract


Kajian ini bertujuan menilai kebolehlaksanaan penggunaan ultra-fine palm oil fuel ash (UPOFA) sebagai penggantian separa simen dalam self-compacting recycled aggregate concrete (SCRAC) yang menggunakan 100% agregat kasar kitar semula. UPOFA digunakan pada kadar penggantian 0%, 10%, 15% dan 20% daripada berat simen. Penilaian prestasi dijalankan melalui ujian kebolehkerjaan (slump flow) serta ujian kekuatan mampatan dan lenturan mengikut piawaian ASTM dan BS yang berkaitan. Keputusan menunjukkan bahawa peningkatan kandungan UPOFA meningkatkan masa aliran runtuh daripada 4.10 s kepada 6.11 s, namun masih berada dalam julat piawaian self-compacting concrete (SCC), menunjukkan kebolehkerjaan yang memuaskan. Dari segi kekuatan mampatan, peningkatan ketara diperhatikan pada umur 28 hari, daripada kira-kira 14 MPa (0% UPOFA) kepada 52 MPa (20% UPOFA), iaitu peningkatan sekitar 270%. Kekuatan lenturan turut meningkat daripada 4.1 MPa kepada 7.2 MPa, bersamaan peningkatan kira-kira 75%. Secara keseluruhan, penggunaan sehingga 20% UPOFA didapati mampu meningkatkan prestasi mekanikal SCRAC tanpa menjejaskan kebolehkerjaan, sekali gus membuktikan potensinya sebagai bahan tambah simen yang lestari dalam konkrit mampat kendiri.


Keywords


abu bahan api kelapa sawit ultra-halus; bahan pozzolan; konkrit agregat kitar semula; konkrit mampan; konkrit mampat kendiri.

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References


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