•  
  •  
 

Keywords

Soil stabilisation, conventional additives, non-conventional additives, compressibility.

Document Type

Research Article

Abstract

Peat soil is problematic in geotechnical engineering due to its high compressibility, low shear strength, and low bearing capacity, making it prone to settling under loads. Effective soil treatment is essential, as traditional removal and replacement methods are unsustainable. This review evaluates the compressibility behaviour of peat stabilised with various stabilising agents, including the conventional and non-conventional additives. Soil stabilisation using chemical additives, including cement, lime, fly ash, gypsum, and recycled concrete aggregate (RCA), is widely applied. However, non-conventional additives alone are often less effective in stabilising peat. For example, peat treated with fly ash shows a behaviour similar to cement-stabilised peat, where the compression index (cc) steadily decreases as the dosage increases. These byproducts, however, offer more than just technical improvement as they provide a sustainable alternative to traditional binders, helping to reduce waste while driving innovation in the circular economy. Fly ash frequently exhibits cement-like behaviour, with cc decreasing progressively with higher dosage. Most non-conventional additives perform best when used in blended or activated systems rather than as standalone binders. Notably, the combination of 10% Mg-rich synthetic gypsum (MRSG) and 10% concrete-waste aggregate (CW) reduced the cc from 0.292 to 0.103, with the measured coefficient of consolidation (cv) ranging from 16.54 to 4 m²/year under different consolidation pressures (5-320 kPa). Therefore, this paper provides an overview of the performance of different additives in reducing the compressibility of the peat soil. A proper selection of additives and the amount added greatly impacts the effectiveness of the soil stabilisation.

html

Publication Date

30-9-2025

First Page

67

Last Page

85

Download

Share

COinS