Abstract
One of the infrastructure developments by the Indonesian government is in Merauke Regency. However, the availability of high-quality materials must be imported from outside, which results in high prices and long delivery times. Alternative construction materials continue to be sought and developed, such as the use of local materials. The aim of this research is to determine which sand is the best as mortar mixture. This mortar study used 3 (three) sands from quarries in Merauke, namely Onggari-1, Bupul-5, and Senayu. The ratio of mortar constituent between cement and sand is 1:2 with FAS 0.4, with 5x5x5 cm test object. The properties of each sand tested in original condition while the mortar compressive strength test was carried out at the age of 8 days, 14 days and 28 days. The mortar also will be tested for volume weight, specific gravity, and water absorption. The analysis results showed Onggari-1 met most of all the properties specifications for concrete with clay particles less than 5%, low organic impurities, and well-graded. The compressive strength achieved by Onggari-1 was the highest at 38,45 MPa, followed by Senayu at 26,01 MPa and Bupul-5 at 19,44 MPa at the age of 28 days. The highest increase in quality of each sand occurred at the age of 14 days. Sand from Senayu and Bupul-5 need maintenance in the form of washing the sand and repairing the gradation. Overall, all sands can be used as masonry work that bear large loads such as exterior and interior walls.
Highlights
PENDAHULUAN Indonesia merupakan negara kepulauan dengan sumber daya alam yang melimpah
of the infrastructure developments by the Indonesian government is in Merauke Regency
which results in high prices
Summary
Kuat Tekan Mortar Untuk memperoleh data kuat tekan, digunakan sembilan (9) buah sampel kubus mortar yang nantinya akan diuji kuat tekannya. Pada umur 14 hari, Onggari-1 memiliki peningkatan mutu sebesar 21,88%, Senayu sebesar 6,38% dan Bupul-5 sebesar 18,78% terhadap umur 8 hari. Hasil kuat tekan tertinggi adalah mortar dari quarry Onggari-1 sebesar 38,45 MPa pada umur 28 hari. Dari pengujian properties pasir Onggari-1 pada kondisi SSD seluruhnya terpenuhi seperti kandungan lumpur 5%, kotoran organis yang tinggi, dan gradasi gap-graded. Mortar Senayu dan Onggari-1 memiliki permukaan mortar halus sempurna yang berdampak pada kuat tekannya yang lebih optimal. Berdasarkan hasil penelitian ini, yang dominan menentukan kuat tekan mortar adalah kandungan lumpur, kotoran organis, gradasi pasir, dan pemadatan campuran.
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