Abstract
Many attempts to reduce the volume of Sidoarjo mudflow that came out, one of which is the use of Sidoarjo mud for making bricks. The results of research in the chemical laboratory show that the Sidoarjo mud mineral content is mostly silica and alumina minerals, so it is very supportive for use as a material for making bricks. Making bricks requires mixed materials, one of which is paper sludge. Paper sludge waste is discharged from the paper industry, which can pollute the environment if it is discharged directly into the environment. Therefore, a solution is needed by utilizing the potential of the sludge waste. One of them is by using paper sludge as an additive in making bricks, because most of the components of paper sludge waste are calcium carbonate. In building materials, calcium carbonate can function as an additive so that paper sludge waste can be used as an additional material in making bricks. The purpose of this study is to determine the best ratio of Sidoarjo mud with paper sludge to the quality of the bricks, find out the best combustion temperature to the quality of the bricks produced, and compare the quality of the bricks before and after burning. The bricks are synthesized with a variation of the ratio of Sidoarjo mud raw material and paper sludge (1: 0, 1: 1, 2: 1, 3: 1) and variations in combustion temperature (no combustion, 400°C, 450°C, 500°C, 750°C, 900°C). In this study, the best quality of bricks according to SNI is 2: 1 ratio bricks with a combustion temperature of 750 ° C. The ratio of 2: 1 brick with a combustion temperature of 750°C has a percentage of water absorption of 17.17% and compressive strength of 37.78 kg / cm2.
Highlights
PENDAHULUAN Bencana lumpur Sidoarjo adalah bencana skala nasional
Many attempts to reduce the volume of Sidoarjo mudflow
of which is the use of Sidoarjo mud for making bricks
Summary
Batubata yang telah dibakar menggunakan furnace pada suhu 400 – 900oC memberikan warna batubata yang berbeda sangat signifikan. Hal ini dapat diperkuat dari data FTIR pada gambar 5 yang menunjukkan adanya gugus Si-OH & C-O yang memiliki kemampuan membentuk ikatan hidrogen dan mengakibatkan terjadinya proses hidrasi (Suci dkk, 2019). Karakterisasi Batubata dengan FTIR Karakterisasi FTIR pada gambar 6 adalah untuk mengidentifikasi keberadaan gugus hidroksida, gugus silanol, paper sludge, dan polimerisasi mineral silika yang terdapat pada batubata. Gambar 6 merupakan hasil uji FTIR batubata dengan bahan baku lumpur Sidoarjo dan paper sludge pada rasio 1:1 dan variasi suhu pembakaran. Hal yang berbeda tampak ketika dilakukan pembakaran batubata pada suhu 900oC (gambar 9 (B)) dimana telah terbentuk mineral crystobalite pada semua rasio bahan baku. Fenomena ini dimungkinkan karena pada komposisi lumpur Sidoarjo semakin tinggi komposisi silikat (SiO4-) dalam batubata berada pada komposisi yang dapat mendorong terbentuknya mineral crystobalite. Hasil Perhitungan Kristalinitas Batubata dan Persentase Daya Serap Air pada Variasi Rasio Komposisi dan Suhu Pembakaran 750oC dan 900oC
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