Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Evaluation of effect of sulfate on class c fly ash and lime stabilized expansive soil
Download
index.pdf
Date
2019
Author
As, Mehme
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
207
views
87
downloads
Cite This
In this study, effect of sulfate on expansive soil treated with Class C Fly Ash was investigated. Also, lime was used for comparison purposes. The swelling soil was prepared at laboratory environment by mixing kaolinite and bentonite. Class C Fly Ashes obtained from Soma and Sivas-Kangal Thermal Power Plants were used as main additives for stabilization. Na2SO4 and CaSO4.2H2O were used as sulfate sources with different concentrations (3000ppm to 40000ppm). Optimum fly ash content was chosen as 15% and 10% for Soma (SFA) and Sivas-Kangal Fly Ash (KFA) respectively. Index tests, swelling and unconfined compressive strength tests were performed to understand the effect of fly ash on sulfate bearing soils. XRD analysis, zeta potential tests and scanning electron microscope were also used to see the effect of treatment on chemical structure and microstructure. Sulfate addition affected the swell potential of each treated specimen differently. Swell potential of 15% SFA treated specimen was positively affected from sulfate addition. Although not dramatic, general increase was observed in the swell potential of 4% lime treated specimen after sulfate addition. Swell potential of 10% KFA treated specimen was not affected much from the sulfate addition, especially for CaSO4.2H2O. The strength of fly ash and lime treated specimens was generally affected negatively from Na2SO4 addition however, CaSO4.2H2O addition had no significant effect. A dramatic decrease was observed in strength of 40000ppm Na2SO4 added fly ash treated specimens that were cured at 10⁰C as a result of the probable salination and ettringite formation.
Subject Keywords
Sulfate
,
Expansive Soils
,
Class C Fly Ash
,
Sulfate
,
Ettringite
,
Salt Heave.
URI
http://etd.lib.metu.edu.tr/upload/12625016/index.pdf
https://hdl.handle.net/11511/45078
Collections
Graduate School of Natural and Applied Sciences, Thesis
Suggestions
OpenMETU
Core
Investigation of ash deposition in a pilot-scale fluidized bed combustor co-firing biomass with lignite
Gogebakan, Zuhal; Gogebakan, Yusuf; Selçuk, Nevin; Seliuk, Ekrem (2009-01-01)
This study presents the results from investigation of ash deposition characteristics of a high ash and sulfur content lignite co-fired with three types of biomass (olive residue, 49 wt%; hazelnut shell, 42 wt%; and cotton residue, 41 wt%) in 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustion (ABFBC) Test Rig. Deposit samples were collected on all air-cooled probe at a temperature of 500 degrees C. Samples were analyzed by SEM/EDX and XRD methods. The results reveal...
Effect of fly ash on swell pressure of an expansive soil
Çokça, Erdal (1999-12-01)
This paper discusses the effect of Fly ash on the engineering properties of expansive soils. As reviewed in literature, many previous investigations have shown promising results for improvement of expansive soil after stabilization with Fly ash. Laboratory tests have been conducted on expansive soils obtained from three different regions in Khartoum state. Various percentages of Fly ash such as 0%, 10%, 20%, 25%, and 30% by weight of soil were added to the three soils and their inf...
Analysis of cellulase and polyphenol oxidase production by southern pine beetle associated fungi
Valiev, Abduvali; Ögel, Zümrüt Begüm; Klepzig, Kier D. (Springer Science and Business Media LLC, 2009-09-01)
In this study, the production of extracellular enzymes by fungi associated with southern pine beetle was investigated for the first time. Cellulase and polyphenol oxidase production were analyzed for three beetle associated fungi. Only the mutualistic symbiont Entomocorticium sp. A was found to produce cellulases and polyphenol oxidase. In time course analyses of cellulase production in batch cultures, Entomocorticium sp. A showed maximum activity of 0.109 U/ml and 0.141 U/ml for total cellulase and endoglu...
EVALUATION OF PYRITIC TAILINGS FROM A COPPER CONCENTRATION PLANT FOR CALCAREOUS SODIC SOIL RECLAMATION
TOZSİN, Gülşen; Arol, Ali İhsan; ÇAYCI, GÖKHAN (2014-01-01)
This study was aimed to investigate the feasibility to use waste pyrite and sulphuric acid produced from waste pyrite for the reclamation of calcareous sodic soils. The final aim is to displace Na from an exchange complex and replace it with Ca, leading to a decrease in pH and exchangeable sodium percentage (ESP) and an improvement of soil structure. A fertility of the soil may also be enhanced by this technique since waste pyrite can be rich in several micronutrients. An additional advantage to this strate...
Evaluation of photosynthetic performance of wheat cultivars exposed to boron toxicity by the JIP fluorescence test
Oz, M. T.; TURAN, ÖZLEM; Kayihan, C.; EYİDOĞAN, FÜSUN; EKMEKÇİ, YASEMİN; YÜCEL, MUSTAFA; Öktem, Hüseyin Avni (Institute of Experimental Botany, 2014-12-01)
The changes in growth and photosynthetic performance of two wheat (Triticum aestivum L.) cultivars (Bolal-2973 and Atay-85) differing in their sensitivity to boron (B) toxicity were investigated under toxic B conditions. Eight-day old seedlings were exposed to highly toxic B concentrations (5, 7.5, and 10 mM H3BO3) for 5 and 9 days. Fast chlorophyll a fluorescence kinetics was determined and analysed using JIP test. Growth parameters, tissue B contents, and membrane damage were measured at two stress durati...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
M. As, “Evaluation of effect of sulfate on class c fly ash and lime stabilized expansive soil,” Thesis (Ph.D.) -- Graduate School of Natural and Applied Sciences. Civil Engineering., Middle East Technical University, 2019.