The effect of alternations in mineral additives (zeolite, bentonite, fly ash) on physico-chemical behavior of Portland cement based binders
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Authors
Terzić, Anja
Pezo, Lato

Mijatović, Nevenka

Stojanović, Jovica

Kragović, Milan

Milicić, Ljiljana
Andrić, Ljubiša
Article (Published version)

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Instrumental analyses accompanied by analytical modeling tools were employed to assess physico-chemical changes induced by variations in chemical composition of cementitious composites, i.e. mortar binders. Coal combustion ash was utilized as pozzolanic mineral additive. The binders' mix-design was supplemented with sorptive clays to prevent migration of toxic elements from fly ash. The experiment was established on the premise of clay's ion-exchanging ability. Ten binders comprising cement CEM I 42.5 and fly ash, zeolite and/or bentonite additions were prepared in accordance with chemometric experimental design rules. Chemical composition was determined via XRF method. The changes in mineral phases and crystallinity were traced by X-ray diffraction. Hydration mechanisms and thermal behavior were investigated via DTA/TGA. The chemical bonds were identified by FTIR. Morphology of hardened samples was detected by SEM. Mathematical tools employed data sets of instrumental analyses to form... a clear differentiation between binders and to assess changes caused by adoption of mineral additives in the mix designs. Sorptive clays showed pozzolanic behavior, thereby causing no incapacitation to the cement hydration mechanism, and classifying as a possible economical resources which can be used in production technology of construction materials to redeem environmental pollution issues of building industry.
Keywords:
Thermal analysis / Structural applications / Recycling / Electron microscopy / Chemical properties / Binders / Analytical modelingSource:
Construction and Building Materials, 2018, 180, 199-210Publisher:
- Elsevier Sci Ltd, Oxford
Funding / projects:
- Ministry of Education, Science and Technological Development of the Republic of Serbia
- Development and application of multifunctional materials using domestic raw materials in upgraded processing lines (RS-45008)
- Directed synthesis, structure and properties of multifunctional materials (RS-172057)
DOI: 10.1016/j.conbuildmat.2018.06.007
ISSN: 0950-0618