The Rheological and Empirical Characteristics of Steel Fibre Reinforced Self-...Roy Belton
Investigating whether a correlation exists between rheology and empiricism for various steel fibre self-compacting concrete mixtures with additional cementitious additions (such as PFA and GGBS).
To Study the Behaviour of use Bituminous Pavement Wastes in Cement Concreteijtsrd
Generally, aggregate prepare 60 to 75 of total concrete amount, therefore the aggregate choice is crucial, and additionally they regulate concrete qualities. Aggregate offer wear resistance as well as strength. So, the aggregate selection, as well as proportioning, must need more attention. The aggregate is usually crushed rocks for example limestone, coarse gravel, maybe granite as well as good aggregate like sand or maybe stone dust. Aggregate formed Bulk pavement structure. This research paper represents a review on the utilization of bituminous pavement wastes. This can assist in obtaining economic climate in construction of road along with preserving environment friendly degradation in term of decreased amount of pollution as well as mining. Gulshan | Nitin Thakur "To Study the Behaviour of use Bituminous Pavement Wastes in Cement Concrete" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd28042.pdfPaper URL: https://www.ijtsrd.com/engineering/civil-engineering/28042/to-study-the-behaviour-of-use-bituminous-pavement-wastes-in-cement-concrete/gulshan
The Rheological and Empirical Characteristics of Steel Fibre Reinforced Self-...Roy Belton
Investigating whether a correlation exists between rheology and empiricism for various steel fibre self-compacting concrete mixtures with additional cementitious additions (such as PFA and GGBS).
To Study the Behaviour of use Bituminous Pavement Wastes in Cement Concreteijtsrd
Generally, aggregate prepare 60 to 75 of total concrete amount, therefore the aggregate choice is crucial, and additionally they regulate concrete qualities. Aggregate offer wear resistance as well as strength. So, the aggregate selection, as well as proportioning, must need more attention. The aggregate is usually crushed rocks for example limestone, coarse gravel, maybe granite as well as good aggregate like sand or maybe stone dust. Aggregate formed Bulk pavement structure. This research paper represents a review on the utilization of bituminous pavement wastes. This can assist in obtaining economic climate in construction of road along with preserving environment friendly degradation in term of decreased amount of pollution as well as mining. Gulshan | Nitin Thakur "To Study the Behaviour of use Bituminous Pavement Wastes in Cement Concrete" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd28042.pdfPaper URL: https://www.ijtsrd.com/engineering/civil-engineering/28042/to-study-the-behaviour-of-use-bituminous-pavement-wastes-in-cement-concrete/gulshan
[ Performance-Based Seismic Design ] Inelastic Behavior of Hollow Reinforced...Tae-Hoon Kim
The purpose of this study was to investigate the inelastic behavior of hollow reinforced concrete bridge columns, and to provide data for developing improved seismic design criteria. By using a sophisticated nonlinear finite element analysis program, the accuracy and objectivity of the assessment process can be enhanced. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. The smeared crack approach was incorporated. The proposed numerical method gives a realistic prediction of inelastic behavior throughout the loading cycles for several test specimens investigated. Additionally, the studies and discussions presented in this investigation provide an insight into the key behavioral aspects of hollow reinforced concrete bridge columns.
Dave Aver, City of Santa Rosa, and Greg Reader, George Reed Inc., deliver a presentation on Superpave Mix Designs, test methods and how the results are incorporated in the final Job Mix Formula. Presentation delivered on Nov. 7, 2019 at the California Asphalt Pavement Association Fall Asphalt Pavement Conference in Sacramento, Calif.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Crushers – An Essential Part of Energy Efficient Comminution Circuitsmetdynamics
Published in: 2011
Author: R Bearman, S Munro and C M Evertsson
Volume Title: MetPlant 2011
The importance of crushers in the mining industry declined with the introduction and resultant dominance of AG and SAG based circuits, but the recent move to consider more energy efficient circuits has caused the industry to re-consider the role of crushers.
Different types of comminution equipment have different efficiency in the way the energy is applied in the size reduction process. Because of the general trend towards more sustainable production processes and emission of carbon dioxide, energy use has become more important. To fully understand how crushers can contribute to optimising the energy application in comminution circuits, detailed models of process performance are required. Such models need to take into account the mechanical design factors and how the crusher performance changes in response to feed conditions, the control strategy utilised and the wear of the crusher liners.
It is also critical to analyse the total circuit, not just the individual crushers. To fully understand the performance of the entire circuit, dynamic simulation should be applied. Without the holistic understanding of the total circuit and the incorporation of transient effects, the full circuit performance cannot be adequately determined and the true energy picture will not be quantified.
Based on detailed mechanistic modelling of crushers by the authors and the application of dynamic simulation, the opportunities to optimise the use of crushers for energy efficiency are examined.
FORMAL CITATION:
Bearman, R, Munro, S and Evertsson, C M, 2011. Crushers – an essential part of energy efficient comminution circuits, in Proceedings MetPlant 2011, pp 66-87 (The Australasian Institute of Mining and Metallurgy: Melbourne).
http://www.ausimm.com.au/publications/epublication.aspx?ID=12799
[ Performance-Based Seismic Design ] Inelastic Behavior of Hollow Reinforced...Tae-Hoon Kim
The purpose of this study was to investigate the inelastic behavior of hollow reinforced concrete bridge columns, and to provide data for developing improved seismic design criteria. By using a sophisticated nonlinear finite element analysis program, the accuracy and objectivity of the assessment process can be enhanced. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. Material nonlinearity is taken into account by comprising tensile, compressive and shear models of cracked concrete and a model of reinforcing steel. The smeared crack approach was incorporated. The proposed numerical method gives a realistic prediction of inelastic behavior throughout the loading cycles for several test specimens investigated. Additionally, the studies and discussions presented in this investigation provide an insight into the key behavioral aspects of hollow reinforced concrete bridge columns.
Dave Aver, City of Santa Rosa, and Greg Reader, George Reed Inc., deliver a presentation on Superpave Mix Designs, test methods and how the results are incorporated in the final Job Mix Formula. Presentation delivered on Nov. 7, 2019 at the California Asphalt Pavement Association Fall Asphalt Pavement Conference in Sacramento, Calif.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Crushers – An Essential Part of Energy Efficient Comminution Circuitsmetdynamics
Published in: 2011
Author: R Bearman, S Munro and C M Evertsson
Volume Title: MetPlant 2011
The importance of crushers in the mining industry declined with the introduction and resultant dominance of AG and SAG based circuits, but the recent move to consider more energy efficient circuits has caused the industry to re-consider the role of crushers.
Different types of comminution equipment have different efficiency in the way the energy is applied in the size reduction process. Because of the general trend towards more sustainable production processes and emission of carbon dioxide, energy use has become more important. To fully understand how crushers can contribute to optimising the energy application in comminution circuits, detailed models of process performance are required. Such models need to take into account the mechanical design factors and how the crusher performance changes in response to feed conditions, the control strategy utilised and the wear of the crusher liners.
It is also critical to analyse the total circuit, not just the individual crushers. To fully understand the performance of the entire circuit, dynamic simulation should be applied. Without the holistic understanding of the total circuit and the incorporation of transient effects, the full circuit performance cannot be adequately determined and the true energy picture will not be quantified.
Based on detailed mechanistic modelling of crushers by the authors and the application of dynamic simulation, the opportunities to optimise the use of crushers for energy efficiency are examined.
FORMAL CITATION:
Bearman, R, Munro, S and Evertsson, C M, 2011. Crushers – an essential part of energy efficient comminution circuits, in Proceedings MetPlant 2011, pp 66-87 (The Australasian Institute of Mining and Metallurgy: Melbourne).
http://www.ausimm.com.au/publications/epublication.aspx?ID=12799
Shaft Grouting - Improving the capacity of bored piles by shaft grouting Nam N.N Tran M.Eng, PMP
Shaft grouting, a relatively new technique, is carried out by injecting grout at discrete points around a pile shaft, assuming that the grout spreads along it
Study on the mechanical properties and fracture behavior of chopped steel fib...eSAT Journals
Abstract
Fiber reinforced concrete (FRC) is widely practiced with high ductility and sufficient durability. In this study, the properties of the
volume fraction and length of steelfiber (SF) on the mechanical properties of FRC were analyzed. This paper provides result data
of the compressive strength, and split tensile strength, flexural strength of steel fiber reinforced concrete. The variables in this
study the percentage of volume fraction (0, 1.0, 1.5, 2, 2.5 & 3) of steel fibersby weight of total weight of concrete. For
compression test, a result data obtained has been analyzed and related with a control specimen (0% fiber). A relationship
between Compressive strength vs. fiber volume fraction and tensile strength vs. fiber volume fraction & flexural strength vs. fiber
volume fraction of steel fiber are represented graphically. The addition of fiber enhanced the ductility significantly. Result data
clearly shows a small increase in compressive strength for M30 Grade of concrete due to addition of 0.1% steel fiber, but for
0.2% addition a marginally increase in strength after that the strength is decreased.
Key words: self-compacting concrete, steel fiber, mechanical properties, volume fraction, fracture energy
Comparative Study on Flexural Strength of M-40 Grade with Lapping of Bars
scc16 poster
1. OBJECTIVE
The consequences of applying different shear rates, after a
rest period, on the rheological properties of cement paste
with SCC consistency has been investigated during
pumping. Determining the rheological properties of cement-
based materials has enabled significant advancement in
different aspects of concrete science, including mix design,
fresh properties and placement. In some cases, e.g.
intensive mixing and pumping, concrete is subjected to
large shear rates that effect rheological properties of
concrete.
BACKGROUND
• Due to the complex composition of concrete, its fresh
properties depend on the shear history.
• Shear rate values of 30 to 60 s-1, in bulk SCC, have
been reported during pumping. whilelayer, formed near
the pipe wall has significantly lower viscosity and the
shear rate in this layer would be several 100 s-1.
• Reological properties are expected to be largely
influenced by pumping or shearing.
METHODS
Mix design for 1.5 L
• Ternary binder:
25% class C fly ash, 2.5% silica fume
• SP (PCE) adjusted for mini SF = 330 mm
Testing Procedure
Influence of Applied Maximum
Shear Rate on Rheological
Properties of Cement-Paste
with SCC Consistency
Azadehalsadat Asghari, Dimitri Feys
Department of Civil, Architectural and Environmental Engineering, Missouri University of Science &
Technology, Rolla, MO, United States
RESULTS
Raw Data
Rheological tests on cement paste with SCC consistency have revealed that the pre-shear has a significant effect
on the rheological properties. From the raw data extracted by Anton Paar MCR 302 Rheometer, it can be
concluded that:
• By increasing the maximum applied shear rate, both the plastic viscosity and yield stress decrease.
• The yield stress value at a pre-shear of 12.5 s-1 is approximately 21% larger than the corresponding yield
stress value at 100 s-1, while a difference of 34% is observed for the viscosity.
I
Fit with Infinite Shear Data Fit with Log Function
SUMMARY
Rheological tests on cement paste with SCC consistency
have revealed that the pre-shear has a significant effect on
the rheological properties. From the results and analysis, it
can be concluded that:
• The yield stress and plastic viscosity decrease
significantly with increasing shear rate applied during the
pre-shear period. This can be attributed to the additional
dispersion the particles undergo when increasing the
applied shear rate.
• Applying a decreasing exponential function, based on
infinite shear rheological properties was deemed
adequate to fit the data, but hindered the repeatability of
the results.
• Logarithmic functions, with the yield stress or viscosity
value at a pre-shear of 100 s-1 as reference, fit the data
well and result in good repeatability.
ACKNOWLEDGEMENTS
The authors would like to acknowledge the RE-CAST Tier-
1 UTC for the financial support and the center for
infrastructure of engineering studies (CIES) at Missouri
S&T for the technical support of this project.
100s-1
50s-1
25s-1
12.5s-1
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
0 20 40 60 80 100
RelativeYieldSress(-)
Applied Pre-Shear (s-1)
YS R1
YS R2
YS R3
YS R4
B
Ae
1,00
D
pp Ce
1,
0.9
1.1
1.3
1.5
1.7
1.9
2.1
0 20 40 60 80 100
RelativePlasticViscosity(-)
Applied Pre-Shear (s-1)
PV R1
PV R2
PV R3
PV R4
100
log1100,00
A
100
log1100,
App
0.9
0.95
1
1.05
1.1
1.15
1.2
1.25
1.3
0 20 40 60 80 100
RelativeYieldSress(-) Applied Pre-Shear (s-1)
YS R1
YS R2
YS R3
YS R4
0.9
1
1.1
1.2
1.3
1.4
1.5
0 20 40 60 80 100
RelativePlasticViscosity(-)
Applied Pre-Shear (s-1)
PV R1
PV R2
PV R3
PV R4
• Quantifying the influence of the different pre-shear on
the plastic viscosity and yield stress by represent the
results by a simple set of parameters,
• Applying Two types of functions (decreasing
exponential and logarithmic) to normalized data.
• Normalizing the yield stress and viscosity values by
their extrapolated values at infinite shear rate for the
exponential curves,
• Normalizing the yield stress and viscosity values by
the respective value at 100 s-1 shear rate for the log
curves.
In polymer rheology: zero shear
and infinite shear viscosity
Fit with log functions, relative
to properties at 100 s-1
0
10
20
30
40
50
60
70
80
90
100
29 31 33 35 37 39
AppliedShearRate(S-1)
Time after cement-water contact (min)