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1 Studia Geotechnica et Mechanica

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Changes in properties of clay surrounding cast in-situ piles

100%

Ghataora G. S. , Ling U. K. , Lee L.

tom Vol. 32, nr 4

3-15

For piles in clay soils, the major contribution to working load capacity is from the shaft resistance, which is influenced by the types of piles used and construction methodology adopted. In the case of preformed piles, the time-related response relates to changes in pore water pressure. However, in the case of cast-in-situ concrete piles it is anticipated that changes in soil chemistry due to migration of ions from the concrete would have an effect on soil/pile interaction. A laboratory- scale test conducted to investigate change in soil chemistry with time and its impact on load carrying capacity of cast in-situ piles in Oxford clay showed that there was a short-term increase in moisture content of soil adjacent to the piles. It also showed that there was an increase in both hydroxyl and calcium ion concentration. These also affected adhesion factor, which increased with time to a limiting value.