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.
References
ASTM C109/C109M – 16a, (2016). Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50-mm] Cube Specimens), Annual Books of ASTM Standards, USA.
ASTM C1585 – 13, (2013). Standard Test Method for Measurement of Rate of Ab-sorption of Water by Hydraulic-Cement Concretes, Annual Books of ASTM Standards, USA.
ASTM C188 – 95 (2003), Standard Test Method for Density of Hydraulic Cement, Annual Books of ASTM Standards, USA.
ASTM C348 – 14, (2014). Standard Test Meth-od for Flexural Strength of Hydraulic-Cement Mortars, Annual Books of ASTM Standards, USA.
Benli, A., Karatas, M. and Gurses, E., (2017).”Effect of sea water and MgSO4 solution on the mechanical properties and durability of self-compacting mortars with fly ash/silica fume”, Construction and Building Materials, Vol. 146, 464-474.
Chindaprasirt, P. dan Rukzon, S. (2007). “Strength, porosity and corrosion re-sistance of ternary blend Portland cement, rice husk ash and fly ash mor-tar”.Construction and Building Materials, Vol. 22, 1601–1606
Gawande, S., Deshmukh, Y., Bhagwat, M., More, S., Nirwal, N. and Phadatare, A., (2017). “Comparative Study of Effect of Salt Water and Fresh Water on Concrete”, International Research Journal of Engi-neering and Technology, Vol. 4 (4),2642-2646.
Halim, L. N., Ekaputri, J. J. and Triwulan, (2017). “The Influence of Salt Water on Chloride Penetration in Geopolymer Con-crete”, MATEC Web of Conferences, ETIC 2016, Vol. 97.
Han, F., Wang, Q., dan Feng, J.,(2015). “The differences among the roles of ground fly ash in the paste, mortar, and concrete”. Construction and Building Materials, Vol. 93, 172 – 179
Liu, J., Ou, G., Qiu, Q., Chen, X., Hong, J. and Xing, F., (2017). “Chloride transport and microstructure of concrete with/without fly ash under atmospheric chloride condi-tion”, Contruction and Building Materials, Vol. 146, 493-501.
Pravallika, S. B. and Laksmi, V., (2014).”A Study on Fly Ash Concrete in Marine En-vironment”, International Journal of In-novative Research in Science, Engineering and Technology, Vol. 3 (5), 12395-12401.
Ramachandra, D., George, R. P., Vishwakarma, V. and Mudali, U. K., (2017). “Strength and Durability Studies of Fly Ash Con-crete in Sea Water Environments Com-pared with Normal and Superplasticized Concrete”, KSCE Journal of Civil Engi-neering, Vol. 21 (4), 1282-1290.
Thomas, M., (2007). “Optimizing the Use of Fly Ash in Concrete”, Concrete Thinking for a sustainable world, Portland Cement Asso-ciation
Ye, H., Jin, N. and Jin, X., (2016). ”An Experi-mental Study on Relastionship among Water Sorptivity, Pore Characteristics, and Salt Concentrations in Concrete”, Periodi-ca Polytechnica Civil Engineering, paper 9621.
