As a kind of new ecological modifier

CMA has good application prospect. Based on Hefei-Luan-Yeji Expressway Project

laboratory comparative tests on basic physical

compacted

swelling-shrinkage and mechanical characteristics of CMA-treated expansive soils have been carried out. Compared with unmodified sample

the free swelling ratio of the modified samples lowers from 71 % to about 20 %; its liquid limit and plastic index also decrease obviously; hydrophilic nature falls down by a wide range as well as micelle content

but silt content increases sharply. The results also indicate that index for swelling-shrinkage property has reduced

swelling ratio without load is 2 %-3 % and swelling power is 5 % of those without modifying. The value of CBR reaches 50 % and deformation is small when soaked; soils have a high shear strength and unconfined compressive strength whether saturated or not

and possess better water stability. Conclusion can be drawn that CMA can change the properties of expansive soils notably and the first formula is suitable for Hefei expansive soils for its good treating effect.