Strength properties of Port Said soft clay stabilized by different binders

Abstract

Due to the short history of the Deep Mixing Method (DMM) in Egyptthere is limited data on the improved properties of Port Said clay. In addition, there are enormous amounts of by-products fro m cement, marb le and limestone industries that need to be employed instead of being environmentally harmfu l materials.This paper aims to bridge the gap of limited data about the effectiveness of dry mixing method to improve strength properties of Port Saidclay using common binders, cement and lime. In addition, the effectiveness of using cement waste, limestone waste and marble powder to partially or fully rep lace cement and limein the dry mixing method was examined.To achieve this purpose, a large number of unconfined compression testsand limited number of triaxial tests were performed. Different binder"s contents and different mixing proportions between binders were blended to prepare specimens using soils representtwo different layers ofSouth Port Said clay. The results of testing specimens afterdifferent curing time showed that dry mixing method can effectively improve strength and stiffness of Port Said clay.It was also concluded that cement waste can partially or fully rep lace cement and lime to improve Port Said clay by dry mixing method whilewith marble powder and limestone waste can partially be used with less effectiveness.

Analysing Foundation on Port Said Soft Clay Stabilized by Deep Mixed Columns

“…As shown in figure (13), the installation of DMC is more effective in reducing settlement with lower values of cohesion strength ratio. When such ratio exceeds 14 the effectiveness of DMC settlement reduction effect becomes independent of cohesion strength ratio Figure (13) DMC cohesion ratio effect on settlement…”

“… Fill material with given name Fill. The input parameters for soil in its natural and mixed state were selected to correspond withSouth of Port Said soft clay as reported bySharoubim et al [13].…”

“…As a continuation to the efforts of Sharoubim et al [13] ,the present study aims to investigate the effectiveness of utilizing floating DM C to stabilize Port Said soft soil.In the present study, road embankment model and raft foundation model are analysed using PLAXIS 2D. A parametric study is performed where the influence of area replacement ratio, depth of DMC, colu mn to soil stiffness ratio, colu mn cohesion and frict ion angle are studied on DMC effectiveness is investigated.…”