Effects of Water on Pore Structure and Thermal Conductivity of Fly Ash-Based Foam Geopolymers
Joint Authors
Source
Advances in Materials Science and Engineering
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-01-03
Country of Publication
Egypt
No. of Pages
10
Abstract EN
The influence of the water-to-solid ratio (W/S) on the viscosity, pore characteristics, bulk density, compressive strength, and thermal conductivity of foamed fly ash-based geopolymers with thermal conductivity less than 0.065 W/(m·K) was investigated, and their properties and cost analysis were also compared with that of foamed ordinary Portland cement (OPC).
When the W/S varied from 0.38 to 0.5, the apparent viscosity of geopolymer paste 15 min after the preparation decreased significantly from 168 Pa·s to 6 Pa·s.
The increasing W/S ratio contributed to the rise of the number of microcapillaries (φ < 50 nm) and macrocapillaries (50 nm < φ < 50 μm) but contributed to the decline of artificial air pores (φ > 50 μm).
The refinement of pore characteristics lowered the 28 d thermal conductivity of foamed geopolymers from 0.06 W/(m·K) to 0.048 W/(m·K).
Although the slight increase of total porosity of foamed geopolymers from 89% to 92% with the increase of the W/S ratio weakened their 28 d compressive strength from 0.75 MPa to 0.45 MPa, this strength still meets the Ordinary Portland Cement (OPC) based Foam Insulation Board standard of JC/T2200-2013 (>0.4 MPa for 0.25 g/cm3).
The production cost of foamed geopolymers was slightly higher by 1.1–1.5 times than that of foamed OPC.
However, considering the more beneficial effect of environmental load reductions and better mechanical and thermal properties of foamed geopolymers than those of foamed OPC, slightly higher cost would be acceptable for practical application.
American Psychological Association (APA)
Cui, Yong& Wang, Dongmin. 2019. Effects of Water on Pore Structure and Thermal Conductivity of Fly Ash-Based Foam Geopolymers. Advances in Materials Science and Engineering،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1119606
Modern Language Association (MLA)
Cui, Yong& Wang, Dongmin. Effects of Water on Pore Structure and Thermal Conductivity of Fly Ash-Based Foam Geopolymers. Advances in Materials Science and Engineering No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1119606
American Medical Association (AMA)
Cui, Yong& Wang, Dongmin. Effects of Water on Pore Structure and Thermal Conductivity of Fly Ash-Based Foam Geopolymers. Advances in Materials Science and Engineering. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1119606
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1119606