Assessment of Concrete Quality of Load-Bearing Structure of the Bridge across Otava River No. 121-006 near Zvikov after Fifty Years of Operation in Severe Environmental Conditions

2016 ◽  
Vol 722 ◽  
pp. 72-78 ◽  
Author(s):  
Stanislav Rehacek ◽  
David Čítek ◽  
Jiri Kolisko ◽  
Petr Huňka
Keyword(s):  
Compression Strength ◽  
Environmental Conditions ◽  
Visual Inspection ◽  
Load Bearing ◽  
Concrete Carbonation ◽  
Concrete Mix ◽  
Concrete Quality ◽  
Bearing Structure

This paper is introducing results of diagnostic survey of bridge no. 121-006 across Otava river near Zvikov [1], focusing on assessment of quality of concrete mix used for load-bearing structure of the bridge after more than 50 years of operation and assessment of reconstruction works (monolithic assembly of central joints of main fields) executed in 1994 [2]. Visual inspection of monolithic assembly joints, comparison of depth of concrete carbonation and thickness of top layer of reinforcement concrete and concrete compression strength are presented in this paper.

Quality Control of the Concrete of the Supporting Structure of Bridge Reg. No. 333-003 over the Elbe in Přelouč

2018 ◽  
Vol 760 ◽  
pp. 278-285
Author(s):  
Stanislav Řeháček ◽  
David Čítek ◽  
Jiří Kolísko
Keyword(s):  
Quality Control ◽  
Compression Strength ◽  
Visual Inspection ◽  
The State ◽  
Supporting Structure ◽  
Concrete Carbonation

This paper is introducing results of diagnostic survey of bridge reg. No. 333-003 over the Elbe in Přelouč [1], which included an evaluation of the previous reconstruction carried out in the 1990s [2, 3] and the quality control of the concrete used in the construction after more than 90 years of operation. Visual inspection, comparison of depth of concrete carbonation and thickness of top layer of reinforcement concrete and concrete compression strength are presented in this paper. This paper come into existence with cooperation with the state-funded organization Road Administration and Maintenance of the Pardubice Region.

scholarly journals Strength analysis and modal analysis for the load-bearing structure of the equipment for opening and compartmentalizing watering furrows, using 1D

2021 ◽  
Vol 286 ◽  
pp. 03008
Author(s):  
Petru Cardei ◽  
Raluca Sfiru ◽  
Marius Oprescu ◽  
Vergil Muraru ◽  
Cornelia Muraru
Keyword(s):  
Finite Element ◽  
Flow Stress ◽  
Structural Model ◽  
Equivalent Stress ◽  
Relative Displacement ◽  
Strength Analysis ◽  
Displacement Fields ◽  
Load Bearing ◽  
Bearing Structure

The paper proposes the analysis of the load-bearing structure of the equipment for opening and compartmentalizing watering furrows (EOCFW), using a 3D structural model, built with 1D finite element. Based on information from the experimental results of the EOCFW equipment, the load-bearing structure is supported and loaded. The results of the linear static analysis of the structure consist of the distributions of the relative displacement fields and the equivalent voltage in the structure. Also, the own frequencies of the structure and the deformed forms of the structure are obtained when it vibrates in its own ways with the lowest own frequencies. It shows how these results can be used. The field of relative displacements is used to assess the effects on the quality of the soil processing performed. The equivalent stress field is used to estimate the safety factor of the structure, by reference to the flow stress of the material from which the structure is built. The first four or five own frequencies are important for the prognosis of possible vibration regimes with resonance, their explanation and their amelioration. It emphasizes the ease with which the model can be modified to obtain improved or even optimized variants.

Concrete Mix Design Using Particle Packing Method: Literature Review, Analysis, and Computation

2021 ◽  
Vol 2 (1) ◽  
pp. 83-102
Author(s):  
Shreya Sunil Tolmatti ◽  
◽  
Sanskruti Jaywant Jadhav ◽  
Sakshi Satish Jadhav ◽  
Mayur M. Maske ◽  
...  
Keyword(s):  
Packing Density ◽  
Particle Packing ◽  
Fine Aggregate ◽  
Density Method ◽  
Correlation Curve ◽  
Concrete Mix Design ◽  
Concrete Mix ◽  
Concrete Quality ◽  
Paste Content

Particle packing technology is used to reduce the amount of cement in concrete by optimizing the concrete mix, resulting in more sustainable concrete. In this study, four different methods were used to determine the distribution of the mixture presented; packing density method, packing density method, IS code method, and packing density method. In the packing density method, the paste content that exceeds the voids will increase along with the increase in the quality of the concrete. In cases of packing density, the cement-water ratio decreases with the quality of the concrete. In the packing of too many trials, trials and tribulations should be carried out to achieve the ratio of water-cement and paste content for a certain grade of concrete. This correlation curve helps reduce the experiments involved in determining the ratio of semen and paste content for a given concrete quality. The water and cement contents for the packing density and the IS code method are almost the same for each particular concrete class. The workability of concrete achieved was more in the packing density method than the IS code method for the same concrete quality, because the water-cement ratio was slightly higher in the packing density method than the IS code method. The required fine aggregate particles are more in terms of packing density method compared to the IS code method. Therefore, more water and cement are required in terms of packing density. The correlation curve can be used to determine the ratio of water-cement and paste the content that exceeds the voids for a certain concrete quality

Innovation on Commercial Concrete Floor Slab Construction Technology

2013 ◽  
Vol 353-356 ◽  
pp. 2836-2839
Author(s):  
Yong Li ◽  
Chang Sheng Guan
Keyword(s):  
Raw Materials ◽  
Construction Technology ◽  
Engineering Applications ◽  
Floor Slab ◽  
Concrete Floor ◽  
Shrinkage Cracks ◽  
Concrete Mix ◽  
Concrete Quality ◽  
The Status

Take Shunjing International Plaza project as an example, investigate on the status of large areas of cast-in-place pumping commercial concrete floor construction , In view of common quality defects of early shrinkage cracks, innovate pumping concrete construction technology, namely, set the sub-grid band, strictly control the quality of raw materials and the concrete mix ratio, rub repeatedly both manually and mechanically, enhance early maintenance, adopt appropriate technical intermittence process and so on, After the engineering applications, the technology had guaranteed the concrete quality smooth and dense, eliminated the early cracks of the concrete.

scholarly journals Inspection of Quality of Concrete of Load-bearing Structure, Bridge No. 121-007 Across Vltava River at Zvikov

2016 ◽  
Vol 156 ◽  
pp. 466-472 ◽  
Author(s):  
Rehacek Stanislav ◽  
Citek David ◽  
Kolisko Jiri ◽  
Simunek Ivo
Keyword(s):  
Load Bearing ◽  
Bearing Structure

Counterfeit Parts Recognition and Detection for Failure Analysts

2010 ◽  
Author(s):  
Katherine V. Whittington
Keyword(s):  
Thermal Cycle ◽  
Visual Inspection ◽  
Acoustic Microscopy ◽  
Scanning Acoustic Microscopy ◽  
3D Measurement ◽  
X Ray ◽  
Wide Range ◽  
Electronic Parts ◽  
Testing Awareness

Abstract The electronics supply chain is being increasingly infiltrated by non-authentic, counterfeit electronic parts, whose use poses a great risk to the integrity and quality of critical hardware. There is a wide range of counterfeit parts such as leads and body molds. The failure analyst has many tools that can be used to investigate counterfeit parts. The key is to follow an investigative path that makes sense for each scenario. External visual inspection is called for whenever the source of supply is questionable. Other methods include use of solvents, 3D measurement, X-ray fluorescence, C-mode scanning acoustic microscopy, thermal cycle testing, burn-in technique, and electrical testing. Awareness, vigilance, and effective investigations are the best defense against the threat of counterfeit parts.

scholarly journals Individual quality of life and the environment – towards a concept of livable areas for persons with disabilities in Poland

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Izabela Grabowska ◽  
Radosław Antczak ◽  
Jan Zwierzchowski ◽  
Tomasz Panek
Keyword(s):  
Quality Of Life ◽  
Environmental Conditions ◽  
Basic Research ◽  
Research Problem ◽  
Individual Characteristics ◽  
Living Conditions ◽  
Special Focus ◽  
Persons With Disabilities ◽  
The Relationship

Abstract Background The United Nations Convention on the Rights of Persons with Disabilities [1] highlights the need to create proper socioeconomic and political conditions for persons with disabilities, with a special focus on their immediate living conditions. According to the Convention, these conditions should be built to ensure that persons with disabilities have the potential to enjoy a high quality of life (QoL), and this principle is reflected in the notion of livable areas. The crucial aspect of this framework is the relationship between the individual QoL and the environment, broadly understood as the socioeconomic as well as the technical conditions in which persons with disabilities function. Methods The basic research problem was to assess the relationship between individual QoL for the population with disabilities as a dependent variable and livability indicators as independent variables, controlling for individual characteristics. The study used a dataset from the EU-SILC (European Union Statistics on Income and Living Conditions) survey carried out in 2015 in Poland. The research concept involved several steps. First, we created a variable measuring the QoL for the entire population with disabilities. To measure the multidimensional QoL, we used Sen’s capability approach as a general concept, which was operationalized by the MIMIC (multiple indicators multiple causes) model. In the second step, we identified the livability indicators available in the official statistics, and merged them with survey data. Finally, in the last step, we ran the regression analysis. We also checked the data for the nested structure. Results We confirmed that the general environmental conditions, focused on creating livable areas, played a significant role in shaping the QoL of persons with disabilities; i.e., we found that the higher the level of the local Human Development Index, the higher the quality of life of the individuals living in this area. This relationship held even after controlling for the demographic characteristics of the respondents. Moreover, we found that in addition to the general environmental conditions, the conditions created especially for persons with disabilities (i.e., services for this group and support for their living conditions) affected the QoL of these individuals. Conclusions The results illustrate the need to strengthen policies aimed at promoting the QoL of persons with disabilities by creating access to community assets and services that can contribute to improving the life chances of this population.

scholarly journals Deep learning-based transformation of H&E stained tissues into special stains

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kevin de Haan ◽  
Yijie Zhang ◽  
Jonathan E. Zuckerman ◽  
Tairan Liu ◽  
Anthony E. Sisk ◽  
...  
Keyword(s):  
Visual Inspection ◽  
Kidney Diseases ◽  
Periodic Acid ◽  
Needle Core Biopsy ◽  
Silver Stain ◽  
Periodic Acid Schiff ◽  
Tissue Sections ◽  
Biopsy Tissue ◽  
Hematoxylin And Eosin

AbstractPathology is practiced by visual inspection of histochemically stained tissue slides. While the hematoxylin and eosin (H&E) stain is most commonly used, special stains can provide additional contrast to different tissue components. Here, we demonstrate the utility of supervised learning-based computational stain transformation from H&E to special stains (Masson’s Trichrome, periodic acid-Schiff and Jones silver stain) using kidney needle core biopsy tissue sections. Based on the evaluation by three renal pathologists, followed by adjudication by a fourth pathologist, we show that the generation of virtual special stains from existing H&E images improves the diagnosis of several non-neoplastic kidney diseases, sampled from 58 unique subjects (P = 0.0095). A second study found that the quality of the computationally generated special stains was statistically equivalent to those which were histochemically stained. This stain-to-stain transformation framework can improve preliminary diagnoses when additional special stains are needed, also providing significant savings in time and cost.

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