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RISS 인기검색어
- 검색키워드
- 저자 : Guadagnini, Maurizio (검색결과 3 건)
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Long-term monitoring of a hybrid SFRC slab on grade using recycled tyre steel fibres
Baricevic, Ana,Grubor, Martina,Paar, Rinaldo,Papastergiou, Panos,Pilakoutas, Kypros,Guadagnini, Maurizio Techno-Press 2020 Advances in concrete construction Vol.10 No.6
This paper presents one of the demonstration projects undertaken during the FP7 EU-funded Anagennisi project (Innovative reuse of all tyre components in concrete-2014-2017) on a full-scale (30 m×40 m, thickness: 0.2 m) Steel Fibre Reinforced Concrete (SFRC) slab-on-grade using a blend of manufactured steel fibres (MSF) and Recycled Tyre Steel Fibres (RTSF). The aim of the project was to assess the use of RTSF in everyday construction practice. The Anagennisi partners, Dulex Ltd in collaboration with Gradmont-Gradacac Ltd and University of Zagreb, designed, cast and monitored the long-term shrinkage deformations of the indoor slab-on-grade slab at Gradmont's precast concrete factory in Gradacac, Bosnia and Herzegovina. A hybrid RTSF mix (20 kg/㎥ of MSF+10 kg/㎥ of RTSF) was used to comply with the design criteria which included a maximum load capacity of 20 kN/㎡. The slab was monitored for one year using surveying equipment and visual inspection of cracks. During the monitoring period, the slab exhibited reasonable deformations (a maximum displacement of 3.3 mm for both, horizontal and vertical displacements) whilst after five years in use, the owners did not report any issues and were satisfied with the construction methodology and materials used. This work confirms that RSTF is a viable and sustainable solution for slab-on-grade applications.
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Numerical Determination of Moisture Diffusivity in Concrete
Shanker Lal Meghwar,Kypros Pilakoutas,Giacomo Torelli,Maurizio Guadagnini 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.9
Accurate modelling of moisture diffusion is essential, as it dominates the drying process in concrete and governs the development of shrinkage strains that affect the short- and long-term deformation and cracking behaviour of structural elements. Key models available in the literature use porosity as the main parameter to predict the diffusivity of the material. Although physically sound, this approach is difficult to apply in practice, as the in-situ determination of concrete porosity is challenging. To address this, the present study uses readily available quantities (namely w/c ratio and concrete maturity) as primary material modelling parameters and investigates the effects of pore relative humidity and ambient temperature on the diffusivity properties of concrete using inverse numerical analysis and available experimental data. As a result, a diffusion modelling approach that can be readily used in practical applications is proposed and verified through finite element analyses. The results show that numerical predictions are in good agreement with experimental data. Specifically, the model is capable of capturing the effects of w/c ratio, concrete maturity and thermal conditions on the evolution of the moisture profile within drying concrete elements. The model can be used to determine drying shrinkage strains with a high degree of accuracy, thereby allowing for a more realistic assessment of crack evolution in drying concrete elements and its effects on overall structural performance.
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Changes in serum levels of lipopolysaccharides and CD26 in patients with Crohn`s disease
( Daniela Oliveira Magro ),( Paulo Gustavo Kotze ),( Carlos Augusto Real Martinez ),( Michel Gardere Camargo ),( Dioze Guadagnini ),( Antonio Ramos Calixto ),( Ana Carolina Junqueira Vasques ),( Maria 대한장연구학회 2017 Intestinal Research Vol.15 No.3
Background/Aims: Lipopolysaccharide (LPS) is a molecule formed by lipids and polysaccharides and is the major cell wall component of gram-negative bacteria. High LPS levels are known to block CD26 expression by activating Toll-like receptor 4. The aim of this study was to correlate the serum levels of LPS and CD26 in Crohn`s disease (CD) patients with serum levels of C-reactive protein (CRP), interleukins, CD activity index, and tumor necrosis factor-α (TNF-α). Methods: Serum samples were collected from 27 individuals (10 with active CD, 10 with inactive CD, and 7 controls) and the levels of LPS, CD26, TNF-α, interleukin-1β (IL-1β), IL-6, IL-17, and CRP were determined by enzyme-linked immunosorbent assay. The levels of LPS and CD26 were then tested for correlation with TNF-α, IL-1β, IL-6, IL-17, and CRP. Results: Serum levels of LPS were significantly elevated in the active CD group (P =0.003). Levels of IL-1β (P =0.002), IL-6 (P =0.003), and IL-17 (P <0.001) were lower in the CD groups. Serum TNF-α levels were increased in the active CD group. The CRP levels were elevated in the CD groups when compared to controls (P <0.001). The CD26 levels were lower in the CD groups than in the control group (P <0.001). Among the variables analyzed, there was a correlation between LPS and CRP (r=-0.53, P =0.016) in the CD groups. Conclusions: Individuals with CD exhibited higher serum levels of LPS varying from a 2- to 6-fold increase depending on disease activity, when compared with healthy controls. CD26 levels were lower in the CD groups. Both LPS and CD26 correlated with disease severity and serve as potential CD biomarkers. (Intest Res 2017;15:352-357)
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