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Fundamental properties of strength and deformation of cement solidified/stabilized zinc contaminated soils

WEI Ming-li,DU Yan-jun,ZHANG Fan(Institute of Geotechnical Engineering,Southeast University,Nanjing 210096,China)  
To investigate characteristics of strength and deformation of cement solidified/stabilized heavy metal contaminated soils(CHMS),a series of unconfined compression tests were performed.Samples of CHMS were prepared artificially by adding zinc nitrate as a source of pollutant at zinc concentrations of 0.01,0.02,0.05,0.1,and 0.2 mg/kg(dry soil weight basis),and three cement contents of 12%,15%,and 18%(dry soil weight basis).The effect of zinc concentration on stress-strain curves is discussed.A proposed parameter(qu/qu,Zn0) is adopted to investigate the effect of zinc concentration on strength properties of samples.The influence of zinc concentration on the strain at failure and deformation modulus is evaluated.It is found that there exits a critical zinc concentration in terms of its influence on strength,strain at failure,and deformation modulus.The influence is marginal in the case that zinc concentration is lower than the critical value,whereas the influence is considerable in the case that zinc concentration is higher than the critical value.
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