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Pore structure and properties of porous geopolymer based on pre-swelled bentonite
Highlights Pre-swelled bentonite slurry was successfully used to prepare porous geopolymer. Water in swelled bentonite slurry resulted in the formation of capillary space. Montmorillonite layer in geopolymer refined capillary space to form small pores. Decreased pore size enhanced thermal insulation performance of porous geopolymer.
Abstract Porous geopolymers (PGs) were prepared by adding a pre-swelled bentonite into a geopolymer paste. The pore-forming mechanism, pore structure, workability and hardened properties of these PGs were investigated. The remaining montmorillonite layers and geopolymer gel transformed from these layers in PGs segregated and subdivided capillary pores to form sub-micron pores. When the bentonite slurry content increased from 0% to 60% at a water-to-powder ratio of 0.45 and 0.55, the pore volume increased from 0.035 mL/g to 0.626 mL/g and from 0.175 mL/g to 0.708 mL/g, respectively, which lead to an improvement of thermal insulation performance. When the bentonite slurry content was 60%, a compressive strength of 1.0 MPa and 1.3 MPa, and a thermal conductivity of 0.104 W/(m·K) and 0.107 W/(m·K) at a dry density of 766 kg/m3 and 827 kg/m3 could be obtained. Bentonite slurry addition below 40% and 20% at a water-to-powder ratio of 0.45 and 0.55 enhanced the PG fluidity.
Pore structure and properties of porous geopolymer based on pre-swelled bentonite
Highlights Pre-swelled bentonite slurry was successfully used to prepare porous geopolymer. Water in swelled bentonite slurry resulted in the formation of capillary space. Montmorillonite layer in geopolymer refined capillary space to form small pores. Decreased pore size enhanced thermal insulation performance of porous geopolymer.
Abstract Porous geopolymers (PGs) were prepared by adding a pre-swelled bentonite into a geopolymer paste. The pore-forming mechanism, pore structure, workability and hardened properties of these PGs were investigated. The remaining montmorillonite layers and geopolymer gel transformed from these layers in PGs segregated and subdivided capillary pores to form sub-micron pores. When the bentonite slurry content increased from 0% to 60% at a water-to-powder ratio of 0.45 and 0.55, the pore volume increased from 0.035 mL/g to 0.626 mL/g and from 0.175 mL/g to 0.708 mL/g, respectively, which lead to an improvement of thermal insulation performance. When the bentonite slurry content was 60%, a compressive strength of 1.0 MPa and 1.3 MPa, and a thermal conductivity of 0.104 W/(m·K) and 0.107 W/(m·K) at a dry density of 766 kg/m3 and 827 kg/m3 could be obtained. Bentonite slurry addition below 40% and 20% at a water-to-powder ratio of 0.45 and 0.55 enhanced the PG fluidity.
Pore structure and properties of porous geopolymer based on pre-swelled bentonite
Yang, Ying (author) / Jiang, Jun (author) / Hou, Li (author) / Lu, Zhongyuan (author) / Li, Jun (author) / Wang, Jinxin (author)
2020-04-16
Article (Journal)
Electronic Resource
English
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