| Title | Calcined Cutter Soil Mixing Residue-Based Alkali-Activated Cement: Compressive Strengths, Reaction Products, and Sustainability |
|---|---|
| ID_Doc | 19007 |
| Authors | Li, YL; Yuan, Q; Li, JB |
| Title | Calcined Cutter Soil Mixing Residue-Based Alkali-Activated Cement: Compressive Strengths, Reaction Products, and Sustainability |
| Year | 2022 |
| Published | Acs Sustainable Chemistry & Engineering, 10.0, 1 |
| Abstract | This paper presents a feasibility study on developing sustainable alkali-activated cement with calcined cutter soil mixing residue (CSMR). CSMR is a solid waste mainly consisting of cemented soil generated from ground improvement and currently ends up in a landfill. Alkali-activated calcined CSMR (AA-CSMR) specimens were prepared and tested. The test variables included silicate modulus (M-s) and alkali dosage of activators, curing regimes, as well as the incorporation of slag. The alkaline activation products were characterized using X-ray diffraction, thermogravimetric analysis, and Fourier transform infrared spectroscopy. Results demonstrate that ambient-cured AA-CSMR cement shows rapid early strength development and achieves a maximum 28-day compressive strength of 33.2 MPa, which can even be increased to 50 MPa or higher by either incorporating 10% ground blast furnace slag or 1-day curing at 70 degrees C. The primary reaction products of the AA-CSMR cement are C-(A)-S-H gels, which could be traced back to the reactive calcium-rich amorphous phases formed in the CSMR by the calcination. Ecological parameters demonstrate that in comparison to the ordinary Portland cement, the AA-CSMR cements save around 60% and 70% embodied energy and CO2 emissions, respectively. |
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