The fundamental compressibility characteristics of solidified dredged marine soil
Yearly large amount of dredged soils is produced during construction of marine structures in Malaysian waters. Dredged soils are generally dumped or deposited in open water, upland or hydraulic fills. As dredged soils consist mainly of clay, some sand and other minerals, they generally display high...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Conference or Workshop Item |
| Published: |
2013
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4553/ http://eprints.uthm.edu.my/4553/1/SMO11.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Yearly large amount of dredged soils is produced during construction of marine structures in Malaysian waters. Dredged soils are generally dumped or deposited in open water, upland or hydraulic fills. As dredged soils consist mainly of clay, some sand and other minerals, they generally display high compressibility, low yield stresses and low permeability. In order to improve the material‟s properties for possible reuse as sound geo-materials, the addition of solidifying agents, such as ordinary Portland cement (OPC) and fly ash is necessary. This study was aimed to determine the one-dimensional compressibility the treated soil, with relation to the solidifying agent dosage and curing period. Standard oedometer tests were carried out on the untreated and treated dredged soils for comparison purposes. The dredged soils were collected from Sungai Dinding, Lumut, Perak. The solidification was carried out with addition of 10 % solidifying agents by dry weight of the soil, with OPC and fly ash mixed at different proportions. The untreated and mixed samples were lightly kneaded and pressed into individual consolidation rings, measuring 75 mm in diameter and 20 mm in height. The specimens were then cured in a dry condition for 3 and 7 days. The oedometer test results showed encouraging solidification effect of the originally soft, weak dredged soil, where compressibility reduction exceeding 60 % was attained with the OPC-fly ash mixture. The enhanced stiffness also indicates decreased permeability of the treated material, an engineering property desirable in load-bearing geo-materials. |
|---|