Topic
Sodium silicate
About: Sodium silicate is a research topic. Over the lifetime, 9967 publications have been published within this topic receiving 101210 citations. The topic is also known as: water glass.
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693 citations
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TL;DR: In this article, the compressive strength of C fly ash (CFA) and a mixed alkali activator of sodium hydroxide and sodium silicate solution was investigated, where the modulus of the activator viz., molar ratio of SiO 2 /Na 2 O was 1.5, and proper content of this activator as evaluated by the mass proportion of Na 2 O to CFA was 10%.
Abstract: Geopolymers prepared from a class C fly ash (CFA) and a mixed alkali activator of sodium hydroxide and sodium silicate solution were investigated. A high compressive strength was obtained when the modulus of the activator viz., molar ratio of SiO 2 /Na 2 O was 1.5, and the proper content of this activator as evaluated by the mass proportion of Na 2 O to CFA was 10%. The compressive strength of these samples was 63.4 MPa when they were cured at 75 °C for 8 h followed by curing at 23 °C for 28 d. In FTIR spectroscopy, the main peaks at 1036 and 1400 cm −1 have been attributed to asymmetric stretching of Al–O/Si–O bonds, while those at 747 cm −1 are due to the Si–O–Si/Si–O–Al bending band. The main geopolymeric gel and calcium silicate hydrate (C–S–H) gel co-exist and bond some remaining unreacted CFA spheres as observed in XRD and SEM–EXDA. The presence of gismondine (zeolite) was also observed in the XRD pattern.
621 citations
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TL;DR: In this paper, the authors investigated the durability of geopolymer materials manufactured using class F fly ash and alkaline activators when exposed to a sulfate environment and found that the most significant deterioration was observed in the sodium sulfate solution and it appeared to be connected to migration of alkalies into solution.
607 citations
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TL;DR: Alkali activation of ground granulated blast furnace slag with sodium silicate gave clinker-free binders, with high strength and early strength development, although set times were short and somewhat variable as mentioned in this paper.
545 citations
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TL;DR: In this paper, the effect of the water, sodium hydroxide and sodium silicate contents in the synthesis of fly ash-based geopolymers on their compressive strength is investigated.
525 citations