Abstract :
Beton campuran dengan menggunakan kapur sirih dan silica fume
merupakan beton yang ramah lingkungan dan dapat mengurangi limbah.
Penggunaan kapur sirih dan silica fume sebagai bahan tambah pada beton,
dimungkinkan akan lebih dapat memiliki kuat tekan yang lebih tinggi. Dalam
penelitian ini, adapun variasi substitusi kapur sirih dan sillica fume yang
digunakan adalah 0%, 5%, 10%, 15%, 20% dan pengujian yang dilakukan
berupa slump test, kuat tekan, dan absorbsi. Dari hasil pengujian penurunan
kuat tekan kapur sirih masing-masing sebesar 70,90%, 59,90%, 53,37%,
49,99% dari beton normal, Kuat tekan terbesar pada substitusi abu kulit kerang
terdapat pada persentase 5% sebesar 25,01 MPa sehingga tidak memenuhi mutu
beton yang direncanakan. Sedangkan penurunan kuat tekan substitusi sillica
fume masing-masing sebesar 82,09%, 75,37%, 65,23%, 60,41% dari beton
normal. Kuat tekan terbesar silica fume 5% sebesar 28,97 MPa. Sedangkan
penurunan kuat tekan pada kombinasi substitusi kapur sirih dan sillica fume
masing-masing sebesar 74,61%, 67,38%, 59,90%, 56,73% dari beton normal.
Dari hasil pengujian tersebut diperoleh penurunan pada kuat tekan. Untuk itu,
jika diadakan penelitian lebih lanjut ada baiknya nilai variasikapur sirih dan
sillica fume diperkecil kurang dari 5% agar dapat dimanfaatkan sebagai bahan
pengganti.
Kata kunci : kapur sirih, sillica fume, kuat tekan, absorbsi. / Mixed concrete using whiting and silica fume is environmentally friendly
concrete and can reduce waste. The use of whiting and silica fume as added
material on concrete, it is possible to have a higher compressive strength. In this
study, the variation of substitution of whiting and sillica fume used was 0%, 5%,
10%, 15%, 20% and the tests were carried out in the form of slump test,
compressive strength, and absorption. From the results of testing the decrease in
compressive strength of whiting each of 70.90%, 59.90%, 53.37%, 49.99% of
normal concrete, the greatest compressive strength on the substitution of shellfish
ash was at a percentage of 5% of 25 , 01 MPa so that it does not meet the planned
concrete quality. While the decrease in the compressive strength of sillica fume
substitution was 82.09%, 75.37%, 65.23%, 60.41% of normal concrete,
respectively. The highest silica fume compressive strength of 5% is 28.97 MPa.
While the decrease in compressive strength in the combination of substitution of
whiting and sillica fume was 74.61%, 67.38%, 59.90%, 56.73% of normal
concrete, respectively. From the test results obtained a decrease in compressive
strength. For that reason, if further research is carried out, it is better to reduce
the value of the variety of betel and sillica fume to less than 5% so that it can be
used as a substitute.
Keywords: whiting, sillica fume, compressive strength, absorption