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Influence of electrochemical treatment on a typical laterite

机译：电化学处理对典型红土的影响

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摘要

The results of the undrained shear strength (S_u) and stiffness (V_s) of electrochemically stabilised residual tropical laterite soil (RTLS) are presented. Calcium (Ca~(2+)) and phosphate (PO_4~(3-)) ions from calcium chloride and phosphoric acid, respectively, were injected individually and together into remoulded RTLS by applying 1 and 2 V/cm direct current electrical gradient for 5 d to facilitate cementation within the treated soil. Three different systems were employed using 1·0 M calcium chloride or 0·01 M sodium chloride as the anolyte and 1 M phosphoric acid or 0·01 M sodium chloride as the catholyte. Polarity reversal was also employed in some tests. The efficacy of the treatment was based on the soil S_u and stiffness. The injection of Ca~(2+) led to a reduction in both the S_u (90%) and stiffness (8%) of the treated RTLS. The injection of PO_4~(3-) resulted in improvement in both the soil S_u (151%) and stiffness (20%) of the treated RTLS. The study concluded that in stabilising the RTLS, injection of PO_4~(3-) is effective whereas the injection of Ca~(2+) is not.
机译：给出了电化学稳定的残余热带红土土壤（RTLS）的不排水剪切强度（S_u）和刚度（V_s）的结果。通过施加1和2 V / cm的直流电梯度分别将氯化钙和磷酸中的钙（Ca〜（2+））和磷酸根（PO_4〜（3-））离子分别注入一起，并一起注入到重塑的RTLS中。 5d以促进在处理过的土壤内的胶结。使用三种不同的系统，其中使用1·0 M氯化钙或0·01 M氯化钠作为阳极电解液，以及1 M磷酸或0·01 M氯化钠作为阴极电解液。在某些测试中还采用了极性反转。处理的有效性基于土壤的S_u和刚度。 Ca〜（2+）的注入导致处理后的RTLS的S_u（90％）和刚度（8％）均降低。 PO_4〜（3-）的注入可改善处理后RTLS的土壤S_u（151％）和刚度（20％）。研究得出结论，为了稳定RTLS，注入PO_4〜（3-）是有效的，而注入Ca〜（2+）则无效。

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