Masters Theses

Bowen Tan

Keywords and Phrases

carbonation; MSWI; nano calcite

Abstract

The in-situ preparation of nano-calcite via bubbling method and the effects of the nano-calcite on the hydration process and properties of the cement-based materials are investigated in this research. The nano-calcite is synthesized under different conditions and added into Portland cement to prepare test samples. The bubbling method is then introduced in upcycling the municipal solid waste incineration (MSWI) ashes, and the effects of the upcycled MSWI ashes on the hydration of Portland cement is investigated. Experimental results illustrate that the COâ‚‚ bubbling method can produce nanometer-to-sub- micron-sized calcite particles, and the synthesis rate and the morphology of the nano-calcite can be influenced by several factors (e.g., COâ‚‚ flow rate and superplasticizer). The incorporation of nano-calcite has shown a significant, positive effects, that is, increase in the early-stage mechanical properties of the cement pastes. The increase varies with the dosage of the nano-calcite. Treated and untreated MSWI ashes are used as alternative supplementary cementitious materials (ASCMs) to investigate the feasibility of the treatment of MSWI ashes with COâ‚‚ bubbling method. Results indicate that the COâ‚‚ bubbling method can improve the quality of some MSWI ashes as ASCMs. Compared with the untreated MSWI ash paste samples, the compressive strength of the treated-small aggregate (a specific type of MSWI bottom ash) samples has increased by ~100% at 7 days. Though the properties of the treated samples are still not comparable to the plain control groups, this study provides positive evidence on the treatment of MSWI ashes with COâ‚‚, making synchronous COâ‚‚ capture/utilization and MSWI ash upcycling a feasible strategy"--Abstract, page iii

Committee Member(s)

Khayat, Kamal
Kumar, Aditya

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2022

Pagination

x, 98 pages

Note about bibliography

Includes bibliographic references (pages 75-97).

Rights

© 2022 Bowen Tan, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 12222

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