Peat soil mass stabilization using geopolymeric hybrid material in early age

Gunawan Wibisono,Monita Olivia,Alfian Kamaldi,Erwin Erwin,M Olivia,K Yamamoto,D Wishart,G Wibisono,I.M Agus Ariawan,M Infantri Yekti,R Ridwan,A Marto,I.D Ketut Sudarsana,D Andrio,E Saputra,G Pringgana

doi:10.1051/matecconf/201927605003

Abstract

Peat is an organic soil, highly compressible and has high water content. The soil needs to be stabilized chemically by incorporating binders such as cement and lime into the soil that will change the properties and soil strength. However, stabilization using cement solely is not recommended since the organic acid in peat soil could delay cement hydration process. Furthermore, mass stabilization using pozzolanic material also could improve strength development of peat soil. In this research, the pozzolanic material in the form of geopolymer hybrid or geopolymer with the addition of Ordinary Portland Cement was investigated. Geopolymer was produced by activating fly ash with a combination of NaOH and sodium silicate. OPC addition improves initial strength and assists geopolymerization at ambient temperature. Variables studied were binder content and a percentage of OPC, and percentage of fly ash. Unconfined Compressive Stress (UCS) at 7 days was measured for all specimens. Mass stabilization using fly ash geopolymer hybrid could improve strength development of peat soil.

Highlights

Construction of infrastructure such as highway in peat ground is inevitable due to demand of accessibility from different places
The specimen produced a compressive strength of 73.47 kPa, which was high for soft soil
The amount of binder that was not sufficient to reduce the adverse effect of organic in peat could reduce the strength gain [2]

Summary

Introduction

Construction of infrastructure such as highway in peat ground is inevitable due to demand of accessibility from different places. Peat soil is considered problematic because it is soft and has high organic content. The soil needs to be treated to improve soil bearing capacity and reduce potential differential settlements damage of the ground. Stabilization is considered an alternative to enhance the peat soil characteristics in construction rather than cut to reduce the amount of peat soil in the field. Mass stabilization is a type of stabilization that mix the binder with soil in a massive volume to homogenize the soil [1]. Using a sufficient amount of binder could help to improve strength gain by producing a stronger network of peat

Methods

Results

Conclusion