scholarly journals Establishing Relationship of Porosity and Strength of Fibre Reinforced Concrete

2019 ◽  
Vol 9 (2S2) ◽  
pp. 82-85
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
The One ◽  
Strength And Durability ◽  
Relationship Of ◽  
The Relationship

There are numerous factors that affect the performance of concrete in terms of strength and durability aspects. Amongst, the pores in the concrete are the one which is playing a foremost role in deciding strength and durability characteristics. The presences of pores in the concrete are due to inferior quality of concrete ingredients, lack of w/c ratio, improper compaction, poor workmanship etc. Many past studies reveal that the presence of fillers materials may reduce the pores on the concrete. But at the same time, the strength and durability should improve a lot. Under these circumstances, the presence of steel fibres in the concrete will give a better solution to arrest the pores and furnish desired results in all aspects. This study is made an attempt to establish the relationship between porosity and compressive strength on the various proportions of steel fibres of M20 and M40 grade concrete

scholarly journals Experimental Investigation of Shear Strength for Steel Fibre Reinforced Concrete Beams

2021 ◽  
Vol 15 (1) ◽  
pp. 81-92
Author(s):  
Constantinos B. Demakos ◽  
Constantinos C. Repapis ◽  
Dimitros P. Drivas
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Steel Fibre ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fibre Reinforced Concrete ◽  
Steel Fibres ◽  
Steel Fibre Reinforced Concrete

Aims: The aim of this paper is to investigate the influence of the volume fraction of fibres, the depth of the beam and the shear span-to-depth ratio on the shear strength of steel fibre reinforced concrete beams. Background: Concrete is a material widely used in structures, as it has high compressive strength and stiffness with low cost manufacturing. However, it presents low tensile strength and ductility. Therefore, through years various materials have been embedded inside it to improve its properties, one of which is steel fibres. Steel fibre reinforced concrete presents improved flexural, tensile, shear and torsional strength and post-cracking ductility. Objective: A better understanding of the shear performance of SFRC could lead to improved behaviour and higher safety of structures subject to high shear forces. Therefore, the influence of steel fibres on shear strength of reinforced concrete beams without transverse reinforcement is experimentally investigated. Methods: Eighteen concrete beams were constructed for this purpose and tested under monotonic four-point bending, six of which were made of plain concrete and twelve of SFRC. Two different aspect ratios of beams, steel fibres volume fractions and shear span-to-depth ratios were selected. Results: During the experimental tests, the ultimate loading, deformation at the mid-span, propagation of cracks and failure mode were detected. From the tests, it was shown that SFRC beams with high volume fractions of fibres exhibited an increased shear capacity. Conclusion: The addition of steel fibres resulted in a slight increase of the compressive strength and a significant increase in the tensile strength of concrete and shear resistance capacity of the beam. Moreover, these beams exhibit a more ductile behaviour. Empirical relations predicting the shear strength capacity of fibre reinforced concrete beams were revised and applied successfully to verify the experimental results obtained in this study.

Retreat from the Male: Catullus 62 and Sappho's Erotic Flowers

Ramus ◽  
1977 ◽  
Vol 6 (2) ◽  
pp. 83-102 ◽  
Author(s):  
Eva Stehle Stigers
Keyword(s):  
Sexual Intimacy ◽  
Short Life ◽  
Narcissistic Personality ◽  
The Stability ◽  
The One ◽  
Relationship Of ◽  
The Relationship ◽  
The Ideal

Catullus described a full emotional circle in his short life from delight in unconstrained aesthetic sensuality free of socially-defined patterns (cc. 5, 6, 13 for example) to longing for a stable bond in the relationship of man to woman. He pictured such a bond as placed within the traditional Roman frame of marriage and home, but cast in a personal mold; he wanted to preserve his aesthetic and sensual response to a woman while combining it somehow with the stability and intimacy appropriate to friendship (amare and bene velle). Poems 72 and 87, for instance, directly express the ideal in acknowledging its absence from Catullus' relations with Lesbia.Catullus liked to feel that the possibility of complete union was what he offered Lesbia. Perhaps it was his inability to fashion a compelling synthesis of sexual intimacy and friendship with her that led him to write a series of poems exploring attempts, mainly failures, at full reciprocal love. The successful attempts are idyllic or mythic (Septimius and Acme, Peleus and Thetis, neither unambiguously positive). The failures come, in Catullus' portrayal, when union founders on the obstacle of the narcissistic personality, the man or woman unable to forfeit autonomy, desirous of holding others in thrall without being himself held. Catullus' highly developed sensitivity to narcissism must be a reaction to its prominence in the character of a certain kind of sexually attractive individual, the one who is alluring but uncapturable, the kind of woman, like Lesbia, with whom Catullus sought union. Catullus conveys the quality of narcissism in such a character in part through the image of the flower (appropriately, considering the source of the modern name for it).

scholarly journals Karakteristik Beton Mutu Tinggi Dengan Komposisi Slag dan Agregat Halus Batu Gamping

2021 ◽  
Vol 3 (2) ◽  
pp. 141-148
Author(s):  
Dicaprio Resen Bunga' ◽  
Frans Phengkarsa ◽  
Desi Sandy
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Fine Aggregate ◽  
Split Tensile Strength ◽  
Alternative Materials ◽  
Main Components ◽  
Relationship Of ◽  
The Relationship ◽  
Nickel Industry

In general, fine aggregate and coarse aggregate as the main components of concrete come from nature so that one day it will run out, alternative substitutes are needed. One of the alternative materials is Nickel Slag. Nickel slag is a type of rock dumped from the nickel industry. Limestone is also used as an alternative to fine aggregate. This study aims to determine the strength of concrete and the relationship between the characteristics of the concrete using nickeI sIag and limestone as a substitute for fine aggregate to the quality of the concrete. As for the variations of 0%, 10% and 20% and the percentage of using limestone as a substitute for fine aggregate is 10%. The method of mixing the concrete uses the SNI-03-2834-2000 method with a planned concrete quality of 42Mpa. From this research, it was found that the compressive strength of concrete with variations of 0%, 10% and 20% were respectively 42.360 MPa, 42.347 MPa and 41.781 MPa, the split tensile strength test with variations of 0%, 10% and 20% respectively was equal to 3.94 MPa, 3.064 MPa and 2.293 MPa and the flexural strength testing with variations of 0%, 10% and 20% were respectively 4.242 MPa, 4.068 MPa and 3.179 MPa. The relationship of split tensile strength for the variation of Nickel Slag variations 0%, 10%, and 20% is 9,242%, 7,178%, and 7% of the compressive strength, respectively, the relationship of split tensile strength for the variation of Nickel Slag variations 0%, 10%, and 20% of 0.65, 0.62, and 0.57 of compressive strength, respectively. From the resuIts of the study, it was concIuded that the concrete mixture with nickel and limestone slag substitution resulted in a decrease in strength as the percentage of nickel slag substitution increased.

scholarly journals Dentin reactions to caries are misinterpreted by histological “gold standards”

F1000Research ◽  
2014 ◽  
Vol 3 ◽  
pp. 13 ◽  
Author(s):  
Priscila Florentino Silva ◽  
Danilo Augusto de Holanda Ferreira ◽  
Kássia Regina Simões Meira ◽  
Franklin Delano Soares Forte ◽  
Ana Maria Barros Chaves ◽  
...  
Keyword(s):  
Polarized Light ◽  
Occlusal Caries ◽  
Dentin Mineralization ◽  
The One ◽  
Relationship Of ◽  
The Relationship ◽  
Caries Lesions ◽  
Gold Standards

Dentin reactions to caries, crucial for pathogenesis and for the determination of the severity of caries lesions, are believed to be reasonably detected by stereomicroscopy (SM) and polarized light microscopy in quinoline (PLMQ), but accuracies are not available. Here, stereomicroscopy of wet (SW) and dry (SD) ground sections of natural occlusal caries lesions resulted in moderate (0.7, for normal dentin) and low accuracies (< 0.6, for carious and sclerotic dentin) as validated by contrast-corrected microradiography. Accuracies of PLMQ were moderate for both normal (0.71) and carious dentin (0.71). The hypothesis that detection of dentin reactions by SM and PLMQ would be influenced by the contrast quality of micrographic images was rejected. Dentin reactions were scored by SW, SD, PLMQ, and three types of microradiographic images with varying contrast qualities and each technique was compared against the one that resulted in the highest number of scores for each dentin reaction. Large differences resulted, mainly related to the detection of sclerotic dentin by both SW and SD, and normal and carious dentin by PLMQ. It is concluded that contrast-corrected microradiography should be preferred as the gold standard and SM and PLMQ should be avoided, but the relationship of PLMQ with dentin mineralization deserves further investigation.

scholarly journals An Experimental Programme on Fibre Reinforced Concrete made with OPC, Fly Ash and Metakaolin

2019 ◽  
Vol 8 (10) ◽  
pp. 3267-3270
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Mineral Admixtures ◽  
Fibre Reinforced Concrete ◽  
Split Tensile Strength ◽  
Natural Sand ◽  
Manufactured Sand ◽  
Strength And Durability ◽  
Pozzolanic Properties

Most commonly used composite building material in construction industry is Concrete due to ease of construction and its properties like compressive strength and durability. The basic ingredient of Concrete having adhesive nature is Ordinary Portland Cement(OPC). OPC is being replaced with Fly Ash and Metakaolin as these mineral admixtures possess pozzolanic properties which credit for strength gain and cost reduction in concreting. In this investigation, OPC is replaced up to 40% with Fly Ash and Metakaolin for M35 grade of Fibre Reinforced Concrete(FRC). Natural sand is replaced completely with Manufactured sand (M-sand). Steel fibres @ 1% of binder are used. Mechanical properties like compressive strength and split tensile strength at 7 days and 28 days age are tested. Additionally durability tests like water absorption and sorptivity after 28days curing are conducted. The test results indicated that 30% replacement of OPC was optimum for strength criteria, workability of Concrete was decreased with increase in replacement of OPC with Fly Ash and Metakaolin together.

scholarly journals The impact of the institutional environment on the shadow economy

2018 ◽  
Vol 68 (1) ◽  
pp. 115-133 ◽  
Author(s):  
Tural Makhmudov ◽  
Maria Konovalova ◽  
Olga Kuzmina ◽  
Natalia Persteneva
Keyword(s):  
Shadow Economy ◽  
Institutional Environment ◽  
Tax Burden ◽  
Economic Policies ◽  
Development Levels ◽  
The One ◽  
Relationship Of ◽  
The Impact ◽  
The Relationship

This article aims to explore the relationship of the shadow economy with the institutional environment and develop practical recommendations for government policies around the world, and particularly in Russia. The urgency of the issue under research is caused by the existing need to study the shadow economy in order to find ways to reduce its scale and level out its negative externalities. Despite the fact that most of the papers focus on tax burden as a fundamental determinant of the shadow economy, the authors of this article believe that institutional tools can expand the boundaries of research on the content of the shadow economy as an economic category. Statistical analysis of 105 countries with different development levels revealed a stronger correlation between the quality of institutions and the size of the shadow economy than the one between total tax burden and the size of the shadow economy. The findings of this article can be useful in developing state strategies for combating the shadow economy and carrying out economic policies of the state as a whole.

scholarly journals Comparative Analysis of Mono-Factorial Effects on Compressive Strength of Sandcrete Block Produced at Various Curing Age in the Warm Humid Climate of Nigeria

2018 ◽  
pp. 1-9
Author(s):  
Ikechukwu Uche Felix
Keyword(s):  
Compressive Strength ◽  
Mutual Interaction ◽  
Humid Climate ◽  
Block Based ◽  
Factorial Effects ◽  
Relationship Of ◽  
The Relationship ◽  
Curing Age ◽  
Production Characteristics

Quality of a composite material like sandcrete block is basically a function of the basic properties of the constituent ingredients, mix ratio relationship and its production characteristics. This study, investigate the effects of change in quantities of the constituent ingredient on compressive strength of sandcrete blocks produced at various curing ages in Owerri Metropolis. Field survey was conducted in the area to determine the production characteristics of the blocks marketed in the area. Based on the prevalent nominal mix ratio of the block, mix design on the constituent ingredients of the block based on box-wilson symmetric composite plan B3was adopted. Results of the strength from each experimental set of the design were used to formpolynomial regression models of blocks cured at various ages. Findings show that the average compressive strengths of the 7-day, 14-day, and 28-day old cured blocks are 1.578 N/mm2, 1.604 N/mm2, and 1.975 N/mm2.Mono-factorial analysis shows that at its respective age of curing, cement and water factors have stronger effect on the strength of the block than sand factor. The nature of their influences is positive, and more linear than quadratic and mutual interaction relationships. The relationship of mutual interaction between the cement and water factors is seen only in the models of the 7-day and 28-day curing ages in the study. Since the strength of the block increases with increase in the age of curing, it therefore confirms the standard practice of 28-day curing age for improved quality of sandcrete block in the industry; as well as recommending mono-factorial analyses on the effects of the independent factors of the mix designed blocks cured age 28-day age, towards optimum composition of the sandcrete mix ingredients for the desired quality of the blocks produced in the study area.

Using the alveograph in developing requirements for the quality of flour for wafer sheet production

2020 ◽  
Vol 29 (12) ◽  
pp. 52-58
Author(s):  
E.P. Meleshkina ◽  
◽  
S.N. Kolomiets ◽  
A.S. Cheskidova ◽  
◽  
...  
Keyword(s):  
Rheological Properties ◽  
Quality Indicators ◽  
Wheat Flour ◽  
Mathematical Statistics ◽  
Intended Purpose ◽  
The Future ◽  
Relationship Of ◽  
The Relationship

Objectively and reliably determined indicators of rheological properties of the dough were identified using the alveograph device to create a system of classifications of wheat and flour from it for the intended purpose in the future. The analysis of the relationship of standardized quality indicators, as well as newly developed indicators for identifying them, differentiating the quality of wheat flour for the intended purpose, i.e. for finished products. To do this, we use mathematical statistics methods.

Management of Economics and State "Bottom"

2020 ◽  
Vol 17 (6) ◽  
pp. 76-91
Author(s):  
E. D. Solozhentsev
Keyword(s):  
Quality Of Life ◽  
Artificial Intelligence ◽  
Probabilistic Models ◽  
Human Life ◽  
Special Software ◽  
Human Quality ◽  
Relationship Of ◽  
The Relationship

The scientific problem of economics “Managing the quality of human life” is formulated on the basis of artificial intelligence, algebra of logic and logical-probabilistic calculus. Managing the quality of human life is represented by managing the processes of his treatment, training and decision making. Events in these processes and the corresponding logical variables relate to the behavior of a person, other persons and infrastructure. The processes of the quality of human life are modeled, analyzed and managed with the participation of the person himself. Scenarios and structural, logical and probabilistic models of managing the quality of human life are given. Special software for quality management is described. The relationship of human quality of life and the digital economy is examined. We consider the role of public opinion in the management of the “bottom” based on the synthesis of many studies on the management of the economics and the state. The bottom management is also feedback from the top management.

An evaluation of ECT sample height for small flute board grades and Box Manufacturer’s Certification compliance

TAPPI Journal ◽  
2009 ◽  
Vol 8 (6) ◽  
pp. 24-28
Author(s):  
CORY JAY WILSON ◽  
BENJAMIN FRANK
Keyword(s):  
Compressive Strength ◽  
Compressive Load ◽  
Test Sample ◽  
Test Methods ◽  
Test Method ◽  
Initial Development ◽  
Sample Height ◽  
Relationship Of ◽  
The Relationship ◽  
Corrugated Fiberboard

TAPPI test T811 is the specified method to ascertain ECT relative to box manufacturer’s certification compliance of corrugated fiberboard under Rule 41/ Alternate Item 222. T811 test sample heights were derived from typical board constructions at the time of the test method’s initial development. New, smaller flute sizes have since been developed, and the use of lighter weight boards has become more common. The T811 test method includes sample specifications for typical A-flute, B-flute, and C-flute singlewall (and doublewall and triplewall) structures, but not for newer thinner E-flute or F-flute structures. This research explores the relationship of ECT sample height to measured compressive load, in an effort to determine valid E-flute and F-flute ECT sample heights for use with the T811 method. Through this process, it identifies challenges present in our use of current ECT test methods as a measure of intrinsic compressive strength for smaller flute structures. The data does not support the use of TAPPI T 811 for ECT measurement for E and F flute structures, and demonstrates inconsistencies with current height specifi-cations for some lightweight B flute.

Sign in / Sign up

Export Citation Format

Share Document