Rational design of cement composites containing pozzolanic additions

0474601 - ÚMCH 2018 RIV GB eng J - Journal Article
Keppert, M. - Urbanová, Martina - Brus, Jiří - Čáchová, M. - Fořt, J. - Trník, A. - Scheinherrová, L. - Záleská, M. - Černý, R.
Rational design of cement composites containing pozzolanic additions.
Construction and Building Materials. Roč. 148, 1 September (2017), s. 411-418. ISSN 0950-0618. E-ISSN 1879-0526
R&D Projects: GA ČR(CZ) GA16-13778S
Institutional support: RVO:61389013
Keywords : cement composites * pozzolanic additions * XRD analysis
OECD category: Civil engineering
Impact factor: 3.485, year: 2017

In cement composite design, pozzolanic additions (PAs) are primarily considered as mass equivalents of cement to be replaced. This paper presents a modification to the traditional approach that takes into account the amounts of active and passive components in a particular PA. The practical application of the modified design method is demonstrated for a red-ceramic residue from brick production. First, the residue is physically and chemically characterized via particle size distribution analysis, X-ray fluorescence spectroscopy, the Chapelle test of pozzolanic activity, and quantitative X-ray diffraction analysis to obtain detailed information on its activity. Subsequently, the effective pozzolanic properties of the residue are assessed by investigating the lime hydrate-ceramic system using solid-state magic angle spinning 27Al and 29Si nuclear magnetic resonance spectroscopy analysis and compressive strength measurements. Finally, cement composites containing different dosages of the ceramic residue are designed using the modified approach and their mechanical and durability properties are compared with reference samples prepared via the conventional method. The experimental results show an improvement of up to 35% in compressive strength and a significant gain in freeze/thaw resistance using the proposed approach.
Permanent Link: http://hdl.handle.net/11104/0271778