Article, 2024

NaAlO2 activated slag and MSWI bottom ash: Phase assemblages and thermodynamic assessment of long-term leaching behavior

Cement and Concrete Composites, ISSN 0958-9465, 1873-393X, Volume 152, Page 105634, 10.1016/j.cemconcomp.2024.105634

Contributors

Liu, Tao 0000-0003-3738-8531 [1] [2] [3] Tang, Yanjie 0000-0001-9679-4746 [1] [4] Ling, Xuan 0000-0002-9439-0585 [1] Stapper, J L 0009-0002-1975-944X [1] Kunther, Wolfgang Kurt 0000-0003-4885-2395 [2] Yu, Qing Liang 0000-0001-8578-3945 (Corresponding author) [1] [3]

Affiliations

  1. [1] Eindhoven University of Technology
    2. [NORA names: Netherlands; Europe, EU; OECD];
  2. [2] Technical University of Denmark
    3. [NORA names: DTU Technical University of Denmark; University; Denmark; Europe, EU; Nordic; OECD];
  3. [3] Wuhan University
    4. [NORA names: China; Asia, East];
  4. [4] Wuhan University of Technology
    5. [NORA names: China; Asia, East]

Abstract

Long-term leaching (heavy metal ions) behavior of municipal solid waste incineration bottom ash (MSWI BA) is one of the issues limiting its application in alkali activated materials (AAMs). This study investigates NaAlO2 activated slag (partially replaced by MSWI BA) in terms of the reaction process and leaching behavior. A combined approach of experimental observation and thermodynamic modeling is utilized. The hardened pastes were evaluated by reaction kinetics, mineralogy, microstructure, strength, and leaching. The thermodynamic modeling included consideration of the raw materials chemistry and activator types. Results show that the modeled C(N)−A−S−H is in line with quantitative results. Specifically, modeled hydrotalcite content (3g/100g binder) is slightly higher than the experimental results (2g/100g binder) at 28 days. Furthermore, the uptake of Cu dramatically increases at 20 days by the generated C(N)−A−S−H gels, while the binding capacity of Sb, sulfates, and chlorides increases with the formation of hydrotalcite formation over time.

Keywords

C(N)-A-S-H, MSWI, MSWI BA, MSWI bottom ash, NaAlO2, Sb, activity, activity types, alkali-activated materials, applications, ash, assemblages, behavior, binding, binding capacity, bottom ash, capacity, chemistry, chloride, content, days, experimental observations, experimental results, formation, gel, hardened paste, hydrotalcite, hydrotalcite content, hydrotalcite formation, incineration bottom ash, issues, kinetics, leaching, leaching behavior, long-term leaching, long-term leaching behavior, materials, materials chemistry, mineralogy, model, municipal solid waste incineration bottom ash, observations, paste, phase, phase assemblage, process, quantitative results, raw material chemistry, reaction, reaction kinetics, reaction process, results, slag, strength, study, sulfate, thermodynamic assessment, thermodynamic model, type, uptake, uptake of Cu, waste incineration bottom ash

Funders

  • National Natural Science Foundation of China

Data Provider: Digital Science

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