@article{Tran Thi_Nguyen Anh_Phan Luu_Tran Thi_2021, title={Use fly ash for the production of lightweight building materials}, volume={43}, url={https://vjs.ac.vn/index.php/jse/article/view/16204}, DOI={10.15625/2615-9783/16204}, abstractNote={<p>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 SiO<sub>2</sub> (51.73%), Al<sub>2</sub>O<sub>3</sub> (23.22%), Fe<sub>2</sub>O<sub>3</sub> (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/cm<sup>3</sup>, 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/Na<sub>2</sub>SiO<sub>3</sub>: Al powder = 100:45:0.15, NaOH/Na<sub>2</sub>SiO<sub>3 </sub>ratio<sub> </sub>= 1:2, the lightweight materials obtained the bulk density of 0,62g/cm<sup>3</sup>, 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.</p>}, number={3}, journal={Vietnam Journal of Earth Sciences}, author={Tran Thi, Lan and Nguyen Anh, Duong and Phan Luu, Anh and Tran Thi, Man}, year={2021}, month={Jun.}, pages={323–335} }