- Open Access
- Authors : Aswathy S, Vishnu P B
- Paper ID : IJERTCONV10IS06009
- Volume & Issue : ICART – 2022 (Volume 10 – Issue 06)
- Published (First Online): 21-06-2022
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License: This work is licensed under a Creative Commons Attribution 4.0 International License
Strength Characteristics of Lime-Pond Ash Treated Dredged Soil
Aswathy S Vishnu P B
M. Tech Research Scholar Assistant Professor Department of Civil Engineering Department of Civil Engineering
Sarabhai Institute of Science & Technology Sarabhai Institute of Science & Technology Thiruvananthapuram, Kerala, India Thiruvananthapuram, Kerala, India
Abstract Effective utilization of dredged soil from various sources will be a solution for open dumping of dredged sediments. Presence of heavy metal in untreated dredged soil will affect the soil properties and ground water contamination. Open disposal of coal combustion products like pond ash creates major environmental and health problems. This paper aims to investigate the strength characteristics of lime-pond ash treated Akkulam dredged soil. About 6% to 12% of lime and 5% to 20% of pond ash were used. From compaction tests and unconfined compressive strength tests results the optimum percentage of lime- pond ash mix is 10% and 15%. The strength properties of stabilized dredged soil are twice than that of untreated dredged soil.
Keywords- Dredged Soil; Lime- Pond Ash; Stabilization; Strength Properties
Akkulam lake is one of the tourist spot in Thiruvananthapuram. As part of rejuvenation project the dredged silts were dumped near the lake shore and later it became a marshy land. Reuse of dredged sediments will be a solution for open dumping. The major waste product from coal power plants is Pond ash and its open disposal affects human health and environment too. So proper utilization of waste products will be a solution for environmental problems and also imparts to sustainable engineering applications. This study aims to evaluate the strength characteristics of treated dredged soil.
OBJECTIVES OF STUDY
To find the properties of treated and untreated dredged soil.
To stabilize dredged soil with lime and pond ash.
To evaluate the strength characteristics of treated dredged soil.
The dredged soil sample was collected from Akkulam lake shore. The soil was dark reddish brown in colour.
Fig.2. Hydrated lime
Hydrated lime used in this study. The lime was in powdered form.
Fig.3 Pond ash
Pond ash used for this study was in powdered form and it was dark grey in colour.
LABORATORY TESTING The properties of dredged soil is shown in Table I.
Percentage of silt particles
Optimum Moisture Content
Maximum dry density
Unconfined Compressive strength
TABLE I. PROPERTIES OF DREDGED SOIL
Fig.1. Dredged soil sample
The dredged soil is classified as High plasticity
RESULTS AND DISCUSSION
In order to find the properties of dredged soil, tests like hydrometer analysis, Compaction test, Unconfined compressive strength test were conducted. Test results were shown below.
Fig 4. Percentage finer graph obtained from hydrometer analysis.
0.0001 0.001 0.01 0.1 1
Compressive strength (kPa)
Fig 5.Unconfined Compressive Strength of lime treated soil.
Lime content (%)
Fig 6. Unconfined Compressive strength of lime- pond ash treated soil.
decrease in unconfined compressive strength. The optimum percentage of pond ash is 15%. Further pond ash addition to dredged soil shows decrease in unconfined compressive strength. It is due to immediate reaction represented by flocculation and agglomeration.
REFERENCES Manju Suthar, Praveen ggarwal (2016), Environmental impact and physicochemical assessment of pond ash for its potential application as a fill material International Journal of Geosynthetics and Ground Engineering-2199-9279  Ernesto Silitonga (2017) Solidification of polluted marine dredged sediment of port Bessin France using hydraulic binders and silica fume IOP Conf. Series: 237 (2017) 012031  Anjali Gupta, Srijit Biswas, V. K. Arora (2019), Selection of most suitable solidified dredged soil to use in highway sub grade layer construction corpus id: 108371094  Abhijith A, V. Jaya (2021), Treatment of Akkulam dredged material with lime, Transportation, Water and Environmental Geotechnics, Proceedings of IGC 2020 Volume 4 (49-61)  Aashiq Hussain Wagay, Dr. Anchal Sharma (2022), The characterisation of the stabilised dredged material as road construction material, IJRES ISSN (Online): 2320-9364, Volume 10 Issue 1 2022 PP. 54-60
Compressive strength (kPa)
0 10 20 30
Pond ash content (%)
The dredged soil from Akkulam lake is classified as MH. The maximum dry density and optimum moisture content of untreated dredged soil is 15.4 kN/m3 and 23.6%. In addition of 6% to 12% of lime in to soil the optimum lime percentage is 10%. Further lime addition in soil shows