离子土壤强化剂改性膨胀土的微结构试验研究

Experimental Study on the Microstructure of ISS-improved Expansive Soil

本文利用离子土壤强化剂对南水北调中线工程河南新乡膨胀土进行了化学改性,并对改性膨胀土的微结构进行了试验研究,结果表明:离子土壤强化剂可以有效地降低膨胀土的比表面积和孔隙体积;掺入离子土壤强化剂的膨胀土中部分矿物形态由片状转变为粒状,且直径大于10 nm的孔隙体积明显减少;离子土壤强化剂和消石灰共同作用,使得膨胀土中矿物形态由片状转变为粒状形态和凝块状形态,且各个直径段的孔隙体积均明显减少。可见离子土壤强化剂可以有效地改善膨胀土的微结构特征。

Ionic soil stabilizer（ISS） is used to improve the expansive soil in North Water Transfer Project in Xinxiang,Henan Province.This research mainly studies the microstructure of improved soils according to tests.It is found that the surface area and microspore volume of expansive soil can be significantly decreased and that,adding a certain dosage of ISS and hydrated lime to expansive soil,the microstructure can be changed from layered structure to grainy one or blocky one and the microspores with the diameter larger than 10 nm are obvious decreased.The microstructures are improved and the structural stability is enhanced.