Assessment of surcharging on strength and stiffness of cement treated clays

Publication Type:
Conference Proceeding
Geotechnical Special Publication, 2012, (228 GSP), pp. 272 - 280
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Deep soil mixing (DSM) is a ground improvement technique most appropriate in applications aimed at improving properties of soft clay, which is very sensitive to temperature and water content changes. This paper presents an experimental study capturing effects of surcharge application during curing time on the stress-strain behaviour of DSM columns. An investigation has been undertaken into the effects of varying surcharges, applied immediately after mixing, ranging from 40kPa to 120kPa, on the strength and stiffness of cement treated kaolinite clay samples with different cement contents. The results of uniaxial tests are analysed to illustrate how the Young's modulus and unconfined compressive strength (UCS) are influenced under varying surcharges. Results confirm a promising increase in strength and stiffness with increased preloading. Results are significant, in that desired DSM column strengths can be achieved through a combination of cement and surcharging, as opposed to increasing the cement content; thus significantly reducing the carbon footprint induced by cement production. © 2012 American Society of Civil Engineers.
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