STUDI PENGARUH AIR LAUT PADA MORTAR BETON NORMAL DAN MORTAR BETON DENGAN FLY ASH
DOI:
https://doi.org/10.24002/jts.v14i3.1979Keywords:
fly ash, mortar, sea water, fresh water - fly ash, air laut, air tawarAbstract
Abstract: Fly ash is the residue of coal combustion in the form of grain which is transported by exhaust gas which can be used in the mortar and concrete manufacture. One of the main source of fly ash is the result of coal combustion at Tanjung Jati B power plant in Jepara. The purpose of this research is to observe fly ash-based mortar behavior toward compressive strength, flexural tensile strength, and absorption by substitution of cement with 20% fly ash precentage of mass ratio followed by immersion with freshwater and sea water taken from Jepara waters. this is used for the compressive strength of the cube 50 x 50 x 50 mm (ASTM C109 / C109M - 16), test specimens for testing the bending strength of 40 x 40 x 160 mm (ASTM C348 - 14), and 100 x 200 cylinders mm for observation of absorption behavior (ASTM C1585 - 13). Non-fly ash test specimens soaked in fresh water act as controls. Non-soaked seawater asphalt test subjects produce the highest compressive strength, but the speci-mens with freshwater-immersed fly ash show no higher yield. In contrast to the compressive strength results, the seawater-impregnated test specimens yield the lowest tensile strength, while the presence of fly ash in other test specimens has little effect. In the absorption test, the use of fly ash mortar with sea water bath resulted in increased velocity and absorption rate, whereas fly ash on specimens soaked in fresh water did not have a significant effect on the mortar absorption behavior.
Abstrak: Fly ash adalah sisa hasil pembakaran batu bara berupa butir halus yang diangkut oleh gas buang yang dapat digunakan dalam pembuatan mortar dan beton. Salah satu sumber fly ash adalah hasil pembakaran batubara di PLTU Tanjung Jati B Jepara. Tujuan dari penelitian ini adalah untuk mengamati perilaku mortar berbasis fly ash terhadap kuat tekan, kuat tarik lentur, dan absorpsinya dengan melakukan substitusi semen dengan prosentase fly ash20% dari per-bandingan massa diikuti perendaman dengan air tawar dan air laut yang diambil dari perairan Jepara.Dalam penelitian ini digunakan benda uji untukkuat tekan berupa kubus 50 x 50 x 50 mm (ASTM C109/C109M – 16), benda uji untuk pengujian kuat tarik lentur berbentuk balok 40 x 40 x 160 mm (ASTM C348 – 14), dan silinder 100 x 200 mm untuk pengamatan perilaku absorpsi (ASTM C1585 – 13). Benda uji tanpa fly ash yang direndam dengan air tawar bertin-dak sebagai benda uji kontrol. Benda uji tanpa fly ash yang direndam air laut menghasilkan kuat tekan tertinggi, tetapi benda uji dengan fly ash yang direndam air tawar tidak menunjuk-kan hasil yang lebih tinggi. Berbeda dengan hasil kuat tekan, benda uji tanpa fly ash yang direndam air laut menghasilkan kuat tarik lentur terendah, sedangkan keberadaan fly ash pada benda uji kategori lain memberikan dampak yang kecil. Dalam pengujian absorpsi, penggunaan mortar dengan fly ash dengan rendaman air laut mengakibatkanpeningkatkan ke-cepatan dan tingkat absorpsi, sedangkan fly ash pada benda uji yang direndam dengan air tawar tidak memberikan pengaruh yang berarti dalam perilaku absorpsi mortar.
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