Details

Autor(en) / Beteiligte

• Ho, Lanh Si
• Nakarai, Kenichiro
• Duc, Myriam
• Kouby, Alain Le
• Maachi, Abdelhak
• Sasaki, Takashi

Titel

Analysis of strength development in cement-treated soils under different curing conditions through microstructural and chemical investigations

Ist Teil von

• Construction & building materials, 2018-03, Vol.166, p.634-646

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• •The strength development of cement-treated soils was quantitatively investigated.•Carbonation and cement hydration/pozzolanic reaction interactions were considered.•Sand, sand-loam, and sand-bentonite were cured under sealed and drying conditions.•Under sealed conditions, the strength of all mixtures steadily increased.•Under drying conditions, behaviors varied with soil mineralogy. 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.