@inproceedings{8639097,
  abstract     = {{Aggregate is a non-renewable material that takes up a large portion of a concrete mixture. Replacing this
material with artificial lightweight aggregate (LWA) that is generated from an industrial by-product such as
fly ash, will significantly reduce the impact on the environment. Alkali-activation is a promising technique to
generate LWA as it proofed to provide better properties to the LWA in comparison to the use of a Portland
cement — fly ash binder. However, only limited studies can be found on applying this technique to produce
LWA. Furthermore, the concentration of alkali activators such as NaOH, is an important parameter that
needs to be investigated in order to produce LWA with excellent properties. Thus, in this research the
NaOH concentration was varied (4 M, 6 M or 8 M) in order to obtain the optimum for producing LWA.
Later on, the produced LWA with a diameter of 2-4 mm was used to replace the fine aggregates in the
mortar. The mechanical and physical properties of the produced LWA were investigated, such as water
absorption, density, particle size distribution, crushing resistance, and mineralogy and the compressive
strength of the resulting mortar. The results showed that a maximum compressive strength of 64 N/mm2
at 28 days could be achieved by mortar containing LWA 8M. Increasing the concentration of NaOH up
to 8M had no significant effect on die water absorption value, particle distribution, density and crushing
resistance of LWA. The result from Quantitative X-Ray Diffraction (QXRD) revealed that there is also
no significant difference in the quantity of amorphous phase formed in the LWA with increasing NaOH
concentration. This finding suggests that alkali-activated fly ash LWA can in the future be synthesized with
a lower concentration of NaOH starting from 4M.}},
  author       = {{Risdanareni, Puput and Schollbach, Katrien and Wang, Jianyun and De Belie, Nele}},
  booktitle    = {{Proceedings ICSBM 2019 Volume 3 - Greened materials}},
  editor       = {{Caprai, Veronica and Brouwers, Jos}},
  isbn         = {{9789038649122}},
  keywords     = {{lightweight aggregate,fly ash,alkali-activated,NaOH Concentration}},
  language     = {{eng}},
  location     = {{Eindhoven, The Netherlands}},
  pages        = {{96--105}},
  publisher    = {{Technische Universiteit Eindhoven}},
  title        = {{The effect of NaOH concentration on the mechanical and physical properties of alkali activated fly ash-based artificial lightweight aggregate}},
  url          = {{https://susbuildmat.com/}},
  year         = {{2019}},
}