Author
Damian Stefaniuk
Other affiliations: Wrocław University of Technology
Bio: Damian Stefaniuk is an academic researcher from University of Houston. The author has contributed to research in topics: Deflection (engineering) & Composite material. The author has an hindex of 2, co-authored 4 publications receiving 10 citations. Previous affiliations of Damian Stefaniuk include Wrocław University of Technology.
Papers
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TL;DR: In this paper, the authors reported experimental results on sol-gel synthesis, structure and morphology of nanocrystalline C-S-H cross-linked with dipodal organosilanes.
17 citations
TL;DR: In this article, the microstructural properties of the aggregates and epoxy resin were analyzed using micro-computed tomography, scanning electron microscopy and nanoindentation.
Abstract: Nowadays, the recycled fine aggregate sourced from construction and demolition waste is not frequently used in manufacturing of epoxy resin coatings. Therefore, the main novelty of the article is to prepare green epoxy resin coatings modified with recycled fine aggregate in a replacement ratio of natural fine aggregate ranged from 20 to 100%. The microstructural properties of the aggregates and epoxy resin were analyzed using micro-computed tomography, scanning electron microscopy and nanoindentation. The macroscopic mechanical properties were examined using pull-off strength tests. The highest improvement of the mechanical properties was observed for epoxy resin coatings modified with 20% of natural fine aggregate and 80% of recycled fine aggregate. It has been found that even 100% of natural fine aggregate can be successfully replaced using the recycled fine aggregate with consequent improvement of the pull-off strength of analyzed epoxy resin coatings. In order to confirm the assumptions resulting from the conducted research, an original analytical and numerical failure model proved the superior behavior of modified coating was developed.
15 citations
TL;DR: In this article, a multiscale modeling framework was developed to link the fundamental physicochemical attributes of calcium silicate hydrate (C-S-H)-FA interfaces across molecular and mesoscale length scales.
5 citations
TL;DR: In this article, an original approach for mechanical characterization was developed using indentation assisted micro-bending, which relies on deflection measurements of cantilever-type beams modeled within the framework of beams on elastic foundation.
5 citations
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TL;DR: In this paper, the authors introduce basic physics concepts and atomistic simulation methods in detail and discuss the progress brought by atomistic simulations in understanding the drying shrinkage in cementitious materials and other nanoporous and nanolayered systems.
43 citations
Journal Article•
TL;DR: In this article, a multiscale study combines statistical physics and mean-field homogenization theory to unravel the relationship between the chemistry of the calcium silicate phases present in the paste and its macroscopic heat capacity and thermal conductivity.
Abstract: Concrete is the most used human-made material on earth, the backbone of civil infrastructure, yet the link between the composition of cement paste and its thermophysical properties remains rather obscure. This multiscale study combines statistical physics and mean-field homogenization theory to unravel the relationship between the chemistry of the calcium silicate phases present in the paste and its macroscopic heat capacity and thermal conductivity. These results offer a robust physical basis for engineering thermal and acoustic isolation of buildings, and more durable ceramics and other construction materials.
27 citations
01 Jan 2000
TL;DR: In this article, the creation of UOFMN (unified organically functionalized mesoporous networks) materials incorporates concepts employed in the synthesis of MCM-41 mesoporus silicates, making use of a quaternary ammonium cationic surfactant and a double trialkoxysilyl precursor such as bis(triethoxyilyl)ethane (BTSE) or bis(Triethoxyslyl)ethylene (bTSEY).
Abstract: Mesoporous materials have been synthesized that are composed of hybrid frameworks in which inorganic and organic components have a fixed stoichiometry and are covalently bonded. The creation of UOFMN (unified organically functionalized mesoporous networks) materials incorporates concepts employed in the synthesis of MCM-41 mesoporous silicates, making use of a quaternary ammonium cationic surfactant and a double trialkoxysilyl precursor such as bis(triethoxysilyl)ethane (BTSE) or bis(triethoxysilyl)ethylene (BTSEY). The cetyltrimethylammonium (CTA+) surfactant is removed by extraction with acid, resulting in a high surface area porous organosilicate framework in which Si atoms are bridged by ethane (from BTSE) or ethylene (BTSEY) groups. The channels are wormlike and uniform in diameter. UOFMN materials are more hydrothermally stable than MCM-41 prepared under similar conditions and have thicker pore walls. Ethylene groups in products made with BTSEY can be brominated, the brominated product itself being ...
17 citations
TL;DR: In this article, small-angle X-ray scattering was used to study the deformation of the binding phase of C-(aluminum-silicate-hydrate) and showed that the lamellae thickness decreases under 100 MPa deviatoric stress.
15 citations
TL;DR: Wang et al. as mentioned in this paper investigated the microstructure evolution of young white Portland cement paste during wetting or drying at different air pressure levels (i.e. 101 kPa, 60 kPa and 20 kPa).
12 citations