The use of recycled materials as binders to stabilize soft clay in laboratory

Thumbnail Image

Files

master_Xiong_Tianlingzi_2019.pdf (8.02 MB)

URL

Journal Title

Journal ISSN

Volume Title

Insinööritieteiden korkeakoulu | Master's thesis
Unless otherwise stated, all rights belong to the author. You may download, display and print this publication for Your own personal use. Commercial use is prohibited.

Authors

Date

2019-03-11

Department

Major/Subject

Mcode

Degree programme

Master's Programme in Geoengineering (GEO)

Language

en

Pages

59 + 33

Series

Abstract

Construction on the site with soft clay is difficult in many ways. The challenges are the low undrained shear strength and high compressibility of soft clay. Mass stabilization, as one of the ground improvement method, is able to improve properties of soft clay. During mass stabilization process, the adding of suitable binders improves strength and load bearing capacity of soft clay. Mass stabilization is an economical and environmentally friendly ground improvement method when binders based on recycled materials are used. Binder is the main matter, which defines the environmental and economical effects of mass stabilization. The objective of this thesis was to find out the most suitable type of binder or binder mixture and the right proportion of ingredients for soft clay in Depot of Vuosaari, Helsinki. This study dealt with tests of several kinds of binder in laboratory condition for further in-situ mass stabilization. Gypsum from VTT Oy, ashes mixture from Ecolan Oy and fly ash from HELEN Oy were the main researched materials in this study. Cement and lime-cement mixture were also used as the reference materials. Unconfined compression tests were the main tests carried out to evaluate and measure the undrained shear strength of stabilized clay. Samples were tested at the age of 28 days and 3 months. In addition, in the aim of getting more comprehension of binders, bending test and compression test were performed on pure binders. In this study, all the binders took a certain degree of increase to the strength of soft clay. Ashes mixture from Ecolan mixed with cement performed as the best combination with a highest undrained shear strength (over 600 kPa).

Description

Supervisor

Korkiala-Tanttu, Leena

Thesis advisor

Forsman, Juha

Keywords

soft clay, binder, mass stabilization, laboratory tests, recycled materials

Other note

Citation

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-201903172294

Collections

[dipl] Insinööritieteiden korkeakoulu / ENG