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Effect of Sodium Aluminate on the Fresh and Hardened Properties of Fly Ash-Based One-Part Geopolymer

Ooi Wan-En, Liew Yun Ming, Yong Heah Cheng, Ho Li-Nge, Al Bakri Abdullah Mohd Mustafa, Ong Shee-Ween, Sandu Andrei Victor

Archives of Metallurgy and Materials

2022

Vol. 67, iss. 2

441--445

The one-part geopolymer binder was synthesis from the mixing of aluminosilicate material with solid alkali activators. The properties of one-part geopolymers vary according to the type and amount of solid alkali activators used. This paper presents the effect of various sodium metasilicate-to-sodium aluminate (NaAlO2/Na2SiO3) ratios on fly ash-based one-part geopolymer. The NaAlO2/Na2SiO3 ratios were set at 1.0 to 3.0. Setting time of fresh one-part geopolymer was examined through Vicat needle apparatus. Mechanical and microstructural properties of developed specimens were analysed after 28 days of curing in ambient condition. The study concluded that an increase in NaAlO2 content delayed the setting time of one-part geopolymer paste. The highest compressive strength was achieved at the NaAlO2/Na2SiO3 ratio of 2.5, which was 33.65 MPa. The microstructural analysis revealed a homogeneous structure at the optimum ratio. While the sodium aluminium silicate hydrate (N-A-S-H) and anorthite phases were detected from the XRD analysis.

Immunization Effect of Sodium Aluminate on Wool

Sirvaityte J., Beleska K., Alaburdaite R., Komiciute I., Valeika V.

Fibres & Textiles in Eastern Europe

2017

Vol. 25, no. 5 (125)

42--46

Since the environmental requirements for leather manufacture as well as for other industry branches are becoming stricter, investigations of unhairing have been directed towards conditions of the process which allow the saving of hair: enzymatic unhairing or unhairing with hair immunization conventionally achieved by using lime and sodium sulphide. The problem is that lime forms a big quantity of liquid waste which contains lime sludge polluted by sulphides and protein degradation products. The research is devoted to the replacement of Ca(OH)2 as hair immunization material with some other soluble non-hazardous material with a similar immunization effect. The preliminary tests showed that alkaline sodium aluminate suits this purpose very well. Its immunisation efficiency increases with prolonged treatment duration and increased concentration of the treatment solution. Treatment with 20 g/l of sodium silicate solution for 3 h allows to reach a high immunization ability almost the same as that of calcium hydroxide under the same conditions. The immunisation effect lasts when the pH is approx. 13.

Ponieważ normy dotyczące ochrony środowiska w przemyśle skórzanym, jak również w innych gałęziach przemysłu stają się coraz bardziej restrykcyjne, badano immunizację wełny wodorotlenkami wapnia i potasu oraz metaglinianem sodu, badając poziom degradacji wełny po obróbce. Efekt immunizacji został oszacowany na podstawie zmian utraty masy wełny i zawartości azotu w roztworze. Potwierdzono, że metaglinian sodu jest skutecznym środkiem immunizującym. Skuteczność immunizacji metaglinianem sodu zwiększa się wraz z wydłużeniem czasu obróbki i zwiększeniem stężenia roztworu.