Analysis of strength development in cement-treated soils under different curing conditions through microstructural and chemical investigations
Autor: | Myriam Duc, Kenichiro Nakarai, Abdelhak Maachi, Sasaki Takashi, Lanh Si Ho, Alain Le Kouby |
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Přispěvatelé: | Hiroshima University, Sols, Roches et Ouvrages Géotechniques (IFSTTAR/GERS/SRO), Communauté Université Paris-Est-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR) |
Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
MICROPORE
Materials science RESISTANCE A LA COMPRESSION Carbonation 0211 other engineering and technologies 02 engineering and technology SOL TRAITE 021105 building & construction COMPRESSIVE STRENGTH General Materials Science POZZOLANIC REACTION CARBONATATION CIMENT Composite material POUZZOLANE Curing (chemistry) 021101 geological & geomatics engineering Civil and Structural Engineering Shrinkage MERCURY INTRUSION POROSIMETRY Cement CEMENT-TREATED SOILS ANALYSE THERMIQUE X-RAY DIFFRACTION Building and Construction [SPI.MECA]Engineering Sciences [physics]/Mechanics [physics.med-ph] Compressive strength THERMAL ANALYSIS Bentonite Soil water Pozzolanic reaction |
Zdroj: | Construction and Building Materials Construction and Building Materials, Elsevier, 2018, 166, pp. 634-646. ⟨10.1016/j.conbuildmat.2018.01.112⟩ |
ISSN: | 0950-0618 |
Popis: | International audience; This study investigated the strength development of cement-treated soils by considering not only the interactions among cement hydration and pozzolanic reaction, but also the carbonation process. Indeed, the chemical and microstructural changes in cement-treated soils are due to carbonation combined with previous reactions and no studies took into account all processes at the same time. Three soil specimen types (specifically, sand, sand-loam, and sand-bentonite mixtures) were cured under sealed and drying conditions and their unconfined compressive strength, microstructural and chemical properties subsequently measured over time. Under drying conditions, behaviors varied with soil mineralogy. The compressive strength of all mixtures significantly increased with decreasing total micropore induced by carbonation and suction effects. However, in the sand-clay mixture under long-term drying, the compressive strength remained constant or slightly decreased after 28 days, correlating with the increase in large capillary pore caused by shrinkage of bentonite and C-S-H carbonation. These results revealed that carbonation could have both positive and negative impacts on strength development of cement-treated soils. |
Databáze: | OpenAIRE |
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