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Pathways to formulate lightweight and ultra-lightweight 3D printable cementitious composites

Journal Article · · Construction and Building Materials
 [1];  [2];  [3];  [3];  [4];  [3]
  1. University of Tennessee, Knoxville, TN (United States); The University of Sydney (Australia)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. University of Tennessee, Knoxville, TN (United States)
  4. The University of Sydney (Australia)

Here, this paper studies the pathways to formulate lightweight and ultra-lightweight 3D printable cementitious composites. A hybrid approach was proposed by combining the advantages of traditional chemical-induced foaming (foaming approach) and lightweight particulate inclusions (synthetic foam approach). A comprehensive experimental program was conducted to evaluate the effects of foaming agents and fly ash cenosphere (FAC) on the printability, microstructure, mechanical and thermal properties of 3D printed samples. The results showed that the hybrid approach could produce a mixture with a density as low as 470 kg/m3 while ensuring good flowability and buildability owing to the lubricating effect of foaming and supporting skeleton formed by FAC. In addition, a three-step homogenization procedure was also developed to predict the effective elastic modulus and thermal conductivity of 3D printable cementitious composites and cementitious foam. The findings of the study highlighted the effectiveness of the hybrid approach in formulating 3D printable ultra-lightweight cementitious composites in thermal insulation and acoustic applications.

Research Organization:
The University of Alabama, Tuscaloosa, AL (United States); University of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
Grant/Contract Number:
EE0008677; AC05-00OR22725
OSTI ID:
3012555
Alternate ID(s):
OSTI ID: 2327048
OSTI ID: 2372967
Journal Information:
Construction and Building Materials, Journal Name: Construction and Building Materials Vol. 424; ISSN 0950-0618
Publisher:
Elsevier BVCopyright Statement
Country of Publication:
United States
Language:
English

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