Experimental Study on the Relation Between EDTA Consumption and Cement Content of Cement Mixing Pile

To investigate the applicability that using EDTA (Ethylene Diamine Tetraacetic Acid) titration detects the cement contentof cementmixing pile, a series of laboratory EDTA consumption tests under the condition of different curing ages and different cement contentdistributions are performed. The results indicate that the relationship between the cement contentdistribution and EDTA consumption approximate linear when cement contentis low (less than 10%). The curve between EDTA consumption and cement contentpresents nonlinear characteristic when the increasing rate of EDTA consumption reduces gradually with the increasing of cement content. Hyperbolic fitting effect is perfect according to the correlation analysis between the cement contentof cementmixing pile and EDTA consumption. The standard curvecan be obtained from the linear relationship between the reciprocal of the cement contentand the reciprocal of EDTA consumption, which is applied to actual test on site.