Analysis of strength development in cement-stabilized silty clay from microstructural considerations |
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| Affiliation: | 1. Southeast University, Institute of Geotechnical Engineering, School of Transportation, Nanjing, China;2. Tongji University, Institute of Geotechnical Engineering, School of Civil Engineering, Shanghai, China;3. Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Nanjing, China;1. Institute of Geotechnical Engineering, Southeast University, No.2 Sipailou, Nanjing 210096, China;2. Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 2W2, Canada;3. Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK;1. PRES LUNAM Université, IFSTTAR, Institut Français des Sciences et des Technologies des Transports, de l''Aménagement et des Réseaux, BP 4129, Route de Bouaye, 44332 Bouguenais, France;2. Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 3, France;3. GeM (UMR CNRS 6183) Institut de Recherche en Génie Civil et Mécanique IUT de Saint-Nazaire, 58 rue Michel Ange, B.P. 420, 44606 Saint-Nazaire Cedex, France |
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| Abstract: | This paper analyzes the strength development in cement-stabilized silty clay based on microstructural considerations. A qualitative and quantitative study on the microstructure is carried out using a scanning electron microscope, mercury intrusion pore size distribution measurements, and thermal gravity analysis. Three influential factors in this investigation are water content, curing time, and cement content. Cement stabilization improves the soil structure by increasing inter-cluster cementation bonding and reducing the pore space. As the cement content increases for a given water content, three zones of improvement are observed: active, inert and deterioration zones. The active zone is the most effective for stabilization where the cementitious products increase with cement content and fill the pore space. In the active zone, the effective mixing state is achieved when the water content is 1.2 times the optimum water content. In this state, the strength is the greatest because of the highest quantity of cementitious products. In the short stabilization period, the volume of large pores (larger than 0.1 μm) increases because of the input of coarser particles (unhydrated cement particles) while the volume of small pores (smaller than 0.1 μm) decreases because of the solidification of the cement gel (hydrated cement). With time, the large pores are filled with the cementitious products; thus, the small pore volume increases, and the total pore volume decreases. This causes the strength development over time. |
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