Pengaruh Kadar Lumpur Material Terhadap Kuat Tekan Beton Pada Pc Spun Pile di PT Jaya Beton Indonesia Surabaya

The Effect Of Material Sludge Content On Concrete Compressive Strength In Pc Spun Pile At PT Jaya Beton Indonesia Surabaya

Kualitas beton dinyatakan tinggi apababila mampu menahan beban gaya yang diberikan pada saat uji kuat tekan yang tinggi, salah satunya kualitas agregat halus yang akan digunakan pada pembuatan beton. Penelitian ini bertujuan untuk mengetahui pengaruh dari zat-zat yang terkandung atau kadar lumpur yang ada pada agregat halus.  Metode penelitian dilakukan dengan mengambil data pengujian laboratorium kadar lumpur dengan pengetesan slump dan kuat tekan sampel beton yang berumur 28 hari berbentuk silinder dengan diameter 10 cm dan tinggi 20 cm dengan 5 variasi kadar lumpur agregat halus 1.5%, 1,7%, 2,4%, 2,7%, 3,6% dengan f’c yang direncanakan 50 Mpa. Hasil penelitian pengujian slump test pada variasi kadar lumpur 1,5%, 1,7%, 2,4%, 2,7%, dan 3,6% memiliki nilai slump yang berbeda semakin tinggi kadar lumpur semakin tinggi nilai slumpnya atau semakin encer campuran beton. Kadar lumpur 1,5% memiliki nilai slump 5,5 cm sedangkan kadar lumpur 3,6% memiliki nilai slump 7,5 cm. Hasil kuat tekan pada benda uji di umur 28 hari semakin tinggi kadar lumpur maka akan terjadi penurunan nilai kuat tekan dan mutunya. Pada kadar lumpur 1,5% menghasilkan rata-rata kuat tekan 494,3 kN dan rata-rata mutu beton 62,972 Mpa sedangkan pada kadar lumpur 3,6% menghasilkan rata-rata kuat tekan 414 kN dan rata-rata mutu beton 52,738 Mpa.

The quality of concrete is declared high if it is able to withstand the force load exerted during high compressive strength tests, one of which is the quality of fine aggregates to be used in making concrete. This study aims to determine the influence of the substances contained or the level of sludge present on fine aggregates.  The research method was carried out by taking laboratory testing data on sludge content by testing slump and compressive strength of concrete samples aged 28 days cylindrical with a diameter of 10 cm and a height of 20 cm with 5 variations of fine aggregate sludge content of 1.5%, 1.7%, 2.4%, 2.7%, 3.6% with a planned f'c of 50 Mpa. The results of slump test testing studies on variations in sludge content of 1.5%, 1.7%, 2.4%, 2.7%, and 3.6% have different slump values, the higher the sludge content, the higher the slump value or the thinner the concrete mixture. The mud content of 1.5% has a slump value of 5.5 cm while the mud content of 3.6% has a slump value of 7.5 cm. The compressive strength results on the test specimen at the age of 28 days, the higher the mud content, the decrease in compressive strength and quality values. At 1.5% mud content produced an average compressive strength of 494.3 kN and an average concrete quality of 62.972 Mpa, while at 3.6% mud content produced an average compressive strength of 414 kN and an average concrete quality of 52.738 Mpa.