Pozzolanic activity of natural zeolites

Download

index.pdf

Date

2013

Author

Özen, Sevgi

Metadata

Show full item record

Item Usage Stats

144
views

166
downloads

The mineralogical properties and the effects of different zeolitic tuffs (clinoptilolites from Gördes, Bigadiç and Aliağa; mordenite from Foça and analcime from Ayvacık, western Turkey) on pozzolanic activity were investigated. The detailed mineralogical, chemical and physical characterization was followed by investigation of the physical and chemical factors that control the pozzolanic reaction in lime-pozzolan pastes in 3 to180 days. For this, thermogravimetric analyses and Fratini’s tests were applied. Experiments showed that higher specific surface area enhances the pozzolanic activity at the initial stage but it has no significant effect on reactions thereafter. The main effect of Si/Al ratio was observed at later stages, especially after 28 days. Clinoptilolite-rich tuffs exchanged with K+ display faster reaction rates than Ca2+ and Na+-exchanged ones at longer periods. The second part of the study covers characterization of crystalline hydration products of hardened pastes as well as compressive strength behavior of blended cement mortars containing zeolitic tuffs as replacement of Portland cement. Furthermore, morphological, chemical and microstructural properties of hydrated cement products were examined. Decreasing intensity of zeolitic peaks on XRD patterns confirms the dissolution of zeolites and their involvement in pozzolanic reactions. Based on the experimental results, the compressive strength of clinoptilolite-rich tuff from Bigadiç exhibited excellent strength performance, which is approximately 10% higher than that of control Portland cement at 28 days of hydration. The compressive strength of clinoptilolite-rich tuff from Gördes is slightly higher than the control cement. It is confirmed that high strength performance should not be only considered with regard to their ability to fix lime. Physical parameters on sample preparation have also important controls on strength e.g. by arrangement of the porosity.

Subject Keywords

Pozzuolanas., Zeolites., Hydration., Porosity., Porous materials.

URI

http://etd.lib.metu.edu.tr/upload/12616061/index.pdf
https://hdl.handle.net/11511/22802

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Novel derivatives of regioisomerically pure 1,7-disubstituted perylene diimide dyes bearing phenoxy and pyrrolidinyl substituents: Synthesis, photophysical, thermal, and structural properties Ozser, Mustafa E.; Sarkodie, Samuel A.; Mohiuddin, Obaidullah; Ozesme, Gozde (2017-12-01) Two new isomerically pure 1,7-substituted perylene-bisimide derivatives namely; 1,7-Di(4-tert-butylphenoxy)N,N'-bis[2-(diethylamino)ethyl]-3,4,9,10-perylene-tetracarboxylic diimide (6) and 1,7-Di(pyrrolidinyl)-N,N'-bis [2-(diethylamino)ethyl]-3,4,9,10-perylene- tetracarboxylic diimide (7), have been synthesized and their electronic absorption, steady-state fluorescence, and thermal properties were studied. Both compounds show good solubility in a range of organic solvents. Attachment of two electron donatin...
Trajectory of iwan: origin, use and meaning from ancient anatolia to islamic period Tuncel, Burcu; Peker, Ali Uzay; Department of History of Architecture (2019) This thesis analyzes the iwan and its typological variations in architecture in terms of its development, migration and cosmological references. Medieval Islamic mysticism (Sufism) with its original theory and practice coalesced ancient lore. Its efflorescence coincides the 11th-13th centuries when Seljuk architecture became developed in Iran and Anatolia. This era is considered as the final stage when the four-iwan-plan reached complete fruition. The geographical route of the Silk Road interconnects Greco-...
Routes and communications in late Roman and Byzantine Anatolia (ca. 4th-9th centuries a.d.) Kaya, Tülin; Özgenel, Lale; Department of Settlement Archaeology. (2020) This study presents a framework to evaluate the impacts of administrative/political and economic structures of the late Roman and Byzantine period on the use of routes and status of cities in Asia Minor. The studies that looked at the dynamics of the era between the 4th-9th centuries argued the state of urbanism, via both literary and archaeological sources, and suggested ‘decline’, ‘transformation’ and ‘continuity’ or ‘discontinuity’ of the classical city. The period considered was dominated by military an...
BOROPHOSPHATES - A NEGLECTED CLASS OF COMPOUNDS - CRYSTAL-STRUCTURES OF M(II)[BPO5] (M(II)=CA, SR) AND BA-3[BP3O12] KNIEP, R; GOZEL, G; EISENMANN, B; ROHR, C; ASBRAND, M; KIZILYALLI, M (Wiley, 1994-04-18) Vertex‐sharing BO4 and PO4 tetrahedra form the framework of the title compounds. Ca[BPO5] and Sr[BPO5] crystallize in the stillwellite structural type and contain tetrahedral chain anions urn:x-wiley:05700833:media:ANIE199407491:tex2gif-stack-1[BPOurn:x-wiley:05700833:media:ANIE199407491:tex2gif-stack-2], which can be described as loop‐branched “dreier” single chains. In Ba3[BP3O12] the urn:x-wiley:05700833:media:ANIE199407491:tex2gif-stack-3tetrahedral anions form “zweifach” open “vierer” single chains. Gi...
Depth integrated equations applied to longitudinal discontinuities on the channel bed Razmand, Maral; Aydın, İsmail; Department of Civil Engineering (2015) Depth integrated equations can be solved over large domains to provide flood inundation maps. In urban and rural areas however, there may be numerous natural or artificial bottom boundary discontinuities in the form of rapid variations in the bed elevation. Such discontinuities cause abrupt changes in the source terms of the governing equations and can significantly affect stability and accuracy of the numerical solution. A 1D code is developed for shallow water equations using HLL approximate Riemann solve...

Citation Formats

S. Özen, “Pozzolanic activity of natural zeolites,” Ph.D. - Doctoral Program, Middle East Technical University, 2013.