A comprehensive evaluation of sedimentary zeolites from Turkey as pozzolanic addition of cement- and lime-based binders

Date

2016-02-15

Author

ÖZEN KARSLI, SEVGİ
Göncüoğlu, Mehmet Cemal
Liguori, B.
de Gennaro, B.
Cappelletti, P.
Gatta, G. D.
Iucolano, F.
Colella, C.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

337
views

0
downloads

The pozzolanic action played by five natural zeolite-rich materials (three clinoptilolite- and one each mordenite- and analcime-bearing rocks) coming from Turkey, has been examined, evaluating also the influence of various chemical-physical parameters, such as grain size of the zeolitic materials and nature of the cation present as extra-framework component of the structure. Pozzolan activity has been estimated by the official test of the European Standards and by thermogravimetry, finding a good accordance between the two procedures. Clinoptilolite-rich rocks gave the best results, but performance turned out to depend on the specific surface area and pre-enrichment in a potassium form. Experimental data analysis demonstrated that the pozzolanic reaction is kinetically controlled by the diffusion of reactants through a layer of dense reaction products. Experimental blended cements with the five zeolite-rich rocks were also prepared and the compressive strengths measured as a function of the curing time. The effectiveness of the pozzolanic action was monitored by XRD and FTIR analyses. An accurate microstructural study of the hardened pastes was also carried out and point analysis performed, pointing out that the zeolite-lime interaction is characterized by two stages: initially zeolite subtracts calcium from the environment by cation exchange, then it acts as a true pozzolan as soon as its structure breaks down.

Subject Keywords

Microstructure, Compressive strength, Zeolite-blended cement, Jander equation, Pozzolanic activity, Analcime, Mordenite, Clinoptilolite, Natural zeolite

URI

https://hdl.handle.net/11511/30728

Journal

CONSTRUCTION AND BUILDING MATERIALS

DOI

https://doi.org/10.1016/j.conbuildmat.2015.12.055

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

A study for the development of seismic design specifications for coastal structures Gözpınar, Erdem; Yalçıner, Ahmet Cevdet; Ergin, Ayşe; Department of Civil Engineering (2003) An evolving design philosophy for port structures in many seismically active regions reflects the observations that: -The deformations in ground and foundation soils and the corresponding structural deformation and stress states are key design parameters. -Conventional limit equilibrium-based methods are not well suited to evaluating these parameters. -Some residual deformation may be acceptable. Performance-based design is an emerging methodology whose goal is to overcome the limitations present in convent...
Comparison of test methods on the compressive strength of slag and natural pozzolan cements Tokgöz, Abdullah Usame; Tokyay, Mustafa; Yaman, İsmail Özgür; Department of Civil Engineering (2014) Among the two standard test methods of determining the compressive strength of cements which are described in EN 196-1 and ASTM C 109, the basic differences is in the amount of water used in preparing the mortars. According to EN 196-1 the former uses a constant water-cement ratio of 0.50 in the preparation of mortar specimens, for all types of cements whereas the latter uses a constant water-cement ratio of 0.485 and 0.460 for Portland and air-entrained Portland cements, respectively; and water-cement rati...
A classification system for excavation of surface coal measures Karpuz, Celal (1990-02-01) A classification system based on the relevant rock mass and material properties of the ground and their influence on excavation equipment performance is described. An excavation rating system is proposed utilizing some rock mass and material properties which influence excavation performances; namely, uniaxial compressive strength, hardness, discontinuity spacing, degree of weathering and seismic wave velocity. The work was carried out in operating Turkish surface lignite mines. It is suggested that this sys...
A SIMPLIFIED APPROACH TO THE SETTLEMENT ESTIMATION OF PILED RAFTS Kalpakci, Volkan; Özkan, M. Yener (2012-01-01) In this study, a simplified approach to the settlement estimation of piled rafts resting on over-consolidated clay deposits is presented. For this purpose, a series of plane-strain and three-dimensional analyses were performed and their results are compared with the available data in the literature. It was found that the percentage decrease in the total settlements with the addition of piles with respect to the unpiled case is very closely estimated by both the plane-strain and the three-dimensional, simpli...
An experimental study of vertical and inclined soil nails under footings as settlement reducers Engin, Harun Kürşat; Ergun, Mehmet Ufuk; Department of Civil Engineering (2005) Vertical and inclined soil nails under footings as settlement ا reducing elements is investigated using a physical 1g model in the laboratory. Nails are not connected to footing, they are not so long and vertical settlement of nails is very large compared to usual limits encountered for piles or micropiles. Following the settlement of footing, they share the load together with the footing. The skin friction is mostly mobilized and end-bearing failure occurs continuously during the settlement. The system of ...

Citation Formats

S. ÖZEN KARSLI et al., “A comprehensive evaluation of sedimentary zeolites from Turkey as pozzolanic addition of cement- and lime-based binders,” CONSTRUCTION AND BUILDING MATERIALS, pp. 46–61, 2016, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30728.