Use fly ash for the production of lightweight building materials

Lan Tran Thi; Duong Nguyen Anh; Anh Phan Luu; Man Tran Thi

doi:10.15625/2615-9783/16204

Author affiliations

Authors

Tran Thi Lan Insitutute of Geological Sciences, VAST, Hanoi, Vietnam
Nguyen Anh Duong Insitutute of Geological Sciences, VAST, Hanoi, Vietnam
Phan Luu Anh Insitutute of Geological Sciences, VAST, Hanoi, Vietnam
Man Tran Thi Insitutute of Geological Sciences, VAST, Hanoi, Vietnam

DOI:

https://doi.org/10.15625/2615-9783/16204

Keywords:

Fly ash, lightweight material, geopolymer, pozzolan, lime

Abstract

Fly ash is a waste byproduct of thermal power plants or steel plants with a low density. Study on using fly ash to produce lightweight construction materials will is a new application of this material resource. Pha Lai fly ash is a byproduct from Pha Lai Thermal Power Joint Stock Company, in which the main mineral component was mullite (15-20%), quartz (14-16%), carbon (5-7%). The content of the amorphous component was about 67-73%. The chemical composition of Pha Lai mainly was SiO₂ (51.73%), Al₂O₃ (23.22%), Fe₂O₃ (4.23%). To fabricate the lightweight material from Pha Lai fly ash, the fly ash was mixed with additive materials to create binders following two ways: (1) lime + fly ash and (2) geopolymer technology. For the way of lime + fly ash, with the optimal mixture ratio was fly ash:lime: water = 10:2:1, the lightweight material samples had the bulk density of 1.32g/cm³, the compressive strength of 3.91 MPa, satisfied the Vietnamese standard TCVN 6477-2011 for concrete bricks. Applying the geopolymer technology, with the optimal mixture ratio was fly ash: NaOH/Na₂SiO₃: Al powder = 100:45:0.15, NaOH/Na₂SiO₃ratio= 1:2, the lightweight materials obtained the bulk density of 0,62g/cm³, the compressive strength of 1,54 MPa, satisfied the Vietnamese standard TCVN:9029-2017 for Lightweight concrete - Foam concrete and non-autoclaved concrete products-specification.

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