Chemistry for the design and better understanding of cement-based materials and composites
-
M. Drábik
,
L’. Gáliková
Abstract
Macrodefect-free (MDF) materials are one example of “hot topics” in the field of cement-based materials and composites exerting new possibilities of the exploitation of added value. These are formed through cross-linking reactions of atoms at the interfaces of cement grains and functional polymers, when medium pressure and twin-rolling procedure are applied. The MDF-relevance of the system of Portland cement + polyphosphate is reported, together with optimal synthesis conditions and limiting rules. The chemistry knowledge about MDF materials has been shown critical for both procedure design and exploitation. Chemical shifts in both 27Al and 31P MAS NMR spectra confirm Al(6)—O—P(4) cross-linking in virgin probes and indicate secondary hydrolysis during moisture uptake in domains free of cross-links. Thermogravimetric identification of the contents of hydrated and cross-linked phases in virgin and in moisture-attacked MDF probes displays that moisture uptake is accompanied by an increase in content of cementitious hydrates and CaCO3. The key phenomena governing the moisture sensitivity/resistance are the density and compactness of interfacial Al(6)—O—P(4) cross-links vs. the access of the moist environment to the unreacted cement residue.
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© 2006 Institute of Chemistry, Slovak Academy of Sciences
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Articles in the same Issue
- Chemistry for the design and better understanding of cement-based materials and composites
- Surface modifications of natural clinoptilolite-dominated zeolite for phenolic pollutant mitigation
- Flame retardant property of nanopowder aerosols toward methane
- Trace analysis of lead by anodic stripping voltammetry with collection at interdigitated microelectrodes in small-volume samples
- Investigation of the solid samples evaporation from the auxiliary DC arc discharge in the atomic emission spectroscopy
- Determination of bioavailable iron in noncontaminated Slovak soils by flame atomic absorption spectrometry
- Determination of technetium-99 in soils and radioactive wastes using ICP-MS
- Synthesis and characterization of the rare-earth complexes with salicylic acid
- Spectrophotometric determination of nickel(II) in different samples by complexation with some triazolylazo dyes
- Complexes of biologically important ligands. I. Ternary complexes of nickel(II) comprising 1,10-o-phenanthrolineazosulfonamide derivatives and alkyldithiophosphates
- Effects of Cd(II) and Zn(II) complexes with bioactive ligands on some photosynthesizing organisms
- Efficiency of a fixed-bed and a gas-lift three-column reactor for continuous production of ethanol by pectate-and alginate-immobilized Saccharomyces cerevisiae cells
- Reactions and applications of trans-1,2-epoxy-(Z,E)-cyclododeca-5,9-diene
- Dictionary of Carbohydrates. Edited by P. M. Collins. Second Edition
- In memoriam Associate Professor Ing. Vladimír Daněk, DrSc
