A study on the effect of NaOH molarity on flyash based self compacting geopolymer concrete

• Published in: Materials today : proceedings 2023-03
• Main Authors: Kiran Kumar, N.L.N., Ramana Reddy, I.V.
• Format: Article
• Language: English
• Subjects: Flyash; Fresh Properties; Mechanical Properties; NaOH solution Molarity; Self compacting Geopolymer concrete
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2023.03.144

The concrete industry has consistently pushed for sustainable development. This investigation aims to examine the characteristics of flyash-based self-compacting geopolymer concrete (SCGPC) made with varying NaOH molarities both while it is fresh and when it has hardened. The NaOH molarity is varied from 8 M to 16 M at an interval of 2 M. Sodium silicate (Na2SiO3) to sodium Hydroxide (NaOH) is kept at a constant ratio of 2. For the geopolymer process, the alkaline solution to Binder ratio (L/B) was kept at 0.45. Fresh properties like Slump flow, T50cm slump flow, L-Box and V-funnel have been done to assess the fresh properties of flyash based SCGPC confirming to EFNARC guidelines. Mechanical Strength properties such as Compressive, split-tensile, and flexural strength of the flyash based SCGPC were also determined at various ages. Prior to testing, all specimens are cured under ambient curing. Results indicate that the hardened properties of flyash based SCGPC are enhanced by the increase in molarity from 8 M to 16 M. Furthermore, as the molarity tends to rise, it is shown that the fresh properties slightly decrease.