The effect of rice husk ash addition as pozzolan on geopolymer binder using alkali activators

Indonesia Malaysia Research Consortium Seminar 2018

Bayuaji, R.^1 ; Dibiantara, D.P.^1 ; Ilmiah, R.^1 ; Husin, N.A.^1 ; Darmawan, M.S.^1 ; Buyung, R.^1 ; Subekti, S.^1

Department of Civil Infrastructure Engineering, Institut Teknologi Sepuluh Nopember, Sukolilo, Surabaya

60111, Indonesia^1

关键词: Alkali activators;    Chemical mixtures;    Control mixtures;    Geopolymer binders;    Geopolymer concrete;    Permeability test;    Recent researches;    Ultrasonic pulse velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/588/1/012035/pdf
DOI  :  10.1088/1757-899X/588/1/012035

来源: IOP

【 摘 要 】

Geopolymer concrete is an example of innovative concrete that does not use cement as a binder and generally fly ash used in recent research. However, fly ash is categorized as a hazardous and toxic waste [8]. This research studied about another binder, besides fly ash, in this case is rice husk ash made as a geopolymer paste alkali activated by a chemical mixture of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) confronted to a fly ash mixture paste as comparative material. The compositions made were, 100% rice husk ash, a mixture of 50% rice husk ash and 50% fly ash, and 100% fly ash as control mixture. After making the mixture, the composition will be tested to setting time-test in the form of paste. The size of specimen was cylindrical 2,5 cm in diameter 5 cm in height and cube size 15 cm x 15 cm x 5 cm. Each type of specimen was projected to porosity test, compressive strength test, UPV (Ultrasonic Pulse Velocity) and permeability test on 3 days, 28 days and 56 days of sample's age. From the result of setting time, it was found that the composition of 100% rice husk ash had the longest on binding, which were 129 minutes for early binding and 170 minutes for late binding. The lowest result of porosity test was 100% of fly ash at 56 days of sample's age testing with a porosity of 20%. The lowest result of compressive strength was 100% of rice husk ash tested in 3 days of sample's age showed a compressive strength at 0.65 MPa. Based on the test results of UPV (Ultrasonic Pulse Velocity), the lowest value of wave velocity was 531.667 m/s, belong to 100% rice husk ash mixture at 3 days of sample's age testing, with very poor binder quality qualification. The test result of highest permeability kT value with very poor-quality index binder was 100% rice husk ash with period of testing time in 3 days 0,047.10-16 m2.