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Chen X, Beatty DN, Matar MG, Cai H, Srubar WV. Algal Biochar-Metal Nanocomposite Particles Tailor the Hydration Kinetics and Compressive Strength of Portland Cement Paste. ACS Sustain Chem Eng 2024; 12:3585-3594. [PMID: 38456189 PMCID: PMC10916760 DOI: 10.1021/acssuschemeng.3c06592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 03/09/2024]
Abstract
Biochar can improve the mechanical properties of portland cement paste and concrete. In this work, we produced algal biochar-zinc (biochar-Zn) and algal biochar-calcium (biochar-Ca) nanocomposite particles and studied their effect on the hydration kinetics and compressive strength of cement paste. Results show that 3 wt % biochar-Zn delayed peak heat evolution during cement hydration from 8.3 to 10.0 h, while 3 wt % addition of biochar-Ca induced a minor acceleration of peak heat from 8.3 to 8.2 h. Both biochar-Zn and biochar-Ca nanocomposite particles increased the compressive strength of cement paste at 28 days by 22.6 and 17.0%, respectively. Data substantiate that retardation or minor acceleration of the reaction kinetics was due exclusively to the presence of Zn and Ca phases, respectively, while the enhanced strength was attributed to a nucleation effect induced by such phases and the internal curing effect of biochar.
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Affiliation(s)
- Xu Chen
- Department
of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 1111 Engineering Drive ECOT 441
UCB 428, Boulder, Colorado 80309, United States
- School
of Civil and Hydraulic Engineering, Huazhong
University of Science and Technology, Wuhan, Hubei 430074, China
| | - Danielle N. Beatty
- Materials
Science and Engineering Program, University
of Colorado Boulder, 4001 Discovery Drive, UCB 027, Boulder, Colorado 80303, United States
| | - Mohammad G. Matar
- Department
of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 1111 Engineering Drive ECOT 441
UCB 428, Boulder, Colorado 80309, United States
| | - Huanchun Cai
- School
of Civil and Hydraulic Engineering, Huazhong
University of Science and Technology, Wuhan, Hubei 430074, China
| | - Wil V. Srubar
- Department
of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, 1111 Engineering Drive ECOT 441
UCB 428, Boulder, Colorado 80309, United States
- Materials
Science and Engineering Program, University
of Colorado Boulder, 4001 Discovery Drive, UCB 027, Boulder, Colorado 80303, United States
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