Karakteristik Mortar Rendah Semen Berbasis Pasir Pantai dengan Ferronickel Slag Powder dan Variasi Vermiculite

Dahlia Patah; Reyvaldi; Riskawahyuni; Nurul  Mutmainnah; Amry Dasar; Nur  Okviyani

Authors

Dahlia Patah Universitas Sulawesi Barat https://orcid.org/0000-0001-7378-3243
Reyvaldi Universitas Sulawesi Barat
Riskawahyuni Universitas Sulawesi Barat
Nurul Mutmainnah Universitas Sulawesi Barat
Amry Dasar Universitas Sulawesi Barat
Nur Okviyani Universitas Sulawesi Barat

Keywords:

Ferronickel slag , initial sorptivity , mortar , pasir pantai, vermiculite

Abstract

Penelitian ini mengevaluasi pengaruh variasi kadar raw vermiculite terhadap densitas, kuat tekan, ultrasonic pulse velocity (UPV), dan initial sorptivity mortar rendah semen yang menggunakan pasir pantai tercuci dan ferronickel slag (FNS) powder. Empat variasi campuran disiapkan, terdiri atas satu campuran kontrol dan tiga campuran modifikasi. Campuran kontrol (V0) dibuat tanpa penambahan FNS powder dan vermiculite, sedangkan V10, V20, dan V30 dibuat dengan kadar FNS powder tetap. Kadar Portland Composite Cement (PCC) pada campuran modifikasi dikurangi sebesar 20%, 30%, dan 40%, dengan water-to binder ratio sebesar 37%. Pengujian meliputi densitas mortar, kuat tekan umur 7 dan 28 hari, UPV, serta initial sorptivity pada umur 28 hari. Hasil penelitian menunjukkan bahwa peningkatan kadar raw vermiculite menurunkan densitas mortar dari 2237,33 kg/m³ pada V0 menjadi 1934,67 kg/m³ pada V30. Kuat tekan umur 28 hari juga menurun dari 22,06 MPa pada V0 menjadi 12,76 MPa, 7,33 MPa, dan 4,57 MPa pada V10, V20, dan V30. Nilai UPV turut menurun dari 3,35 km/s pada V0 menjadi 2,49 km/s pada V30, yang menunjukkan berkurangnya kontinuitas matriks. Sebaliknya, initial sorptivity meningkat seiring bertambahnya kadar vermiculite, yang mengindikasikan peningkatan penyerapan air kapiler. Implikasi penelitian ini menunjukkan bahwa penggunaan raw vermiculite perlu dikontrol secara ketat, dengan V10 sebagai campuran modifikasi paling seimbang untuk aplikasi mortar ringan non-struktural berbasis pasir pantai.

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