Strength, thermal conductivity and sound absorption of cellular lightweight high calcium fly ash geopolymer concrete

• Main Authors: Athika Wongkvanklom, Patcharapol Posi, Pornnapa Kasemsiri, Vanchai Sata, Trinh Cao, Prinya Chindaprasirt
• Format: Article
• Language: English
• Published: Khon Kaen University 2021-06-01
• Series: Engineering and Applied Science Research
• Subjects: cellular lightweight geopolymer concrete; mechanical property; thermal property; sound absorption
• Online Access: https://ph01.tci-thaijo.org/index.php/easr/article/download/243363/166259/

In this research, the effects of foam content on mechanical property, thermal property and sound absorption of cellular lightweight geopolymer concrete (CLGC) were studied. The geopolymer mixtures were made with 15 M NaOH solution, sodium silicate/NaOH ratio (NS/NaOH) of 1.00, sand/ash ratio of 1.25, liquid/fly ash ratio of 0.4. The foam contents were varied from 2-12 %wt. The 28-day compressive strength of CLGCs of 2.7-57.8 MPa, unit weight of 844-2100 kg/m3, water absorption of 1.36-31.25%, porosity of 2.82-49.42%, thermal conductivity of 0.13-1.62 W/mK, and sound absorption coefficients of 0.05-0.5 were obtained. The CLGCs with 4% foam content, 28-day compressive strength of 38.9 MPa and unit weight of 1815 kg/m3is suitable for structural lightweight concrete complying to the requirements of ASTM C330/C330M-17a. Whereas the mix with 8 and 10 % foam contents with compressive strengths of 7.60 and 6.1 MPa, and unit weights of 1210 and 1060kg/m3are suitable for use as masonry lightweight concrete block in accordance with ASTM C331/C331M-17.