This presentation contains the basic information about the GDP, also some kind of important calculations and examples that you will understand well. Anyone one who want to use this presentation to improve your understanding about essential concepts of the economy.
This presentation contains the basic information about the GDP, also some kind of important calculations and examples that you will understand well. Anyone one who want to use this presentation to improve your understanding about essential concepts of the economy.
EFFECT OF NANO-SILICA ON CONCRETE CONTAINING METAKAOLINIAEME Publication
In this paper the results of an experimental investigation on the use of Metakaolin (MK) and Nano-Silica (NS) on various properties of concrete are presented. Metakaolin and Nano-Silica are used as partial replacement of cement for the preparation of concrete. In the present investigation initially cement is partially replaced by Metakaolin 5% and 10% by weight. Further investigation is carried out by combined replacement of Metakaolin at 5% and 10% with Nano-Silica at 1%, 2% and 3% by weight of cement. For structural applications the various properties, such as compressive strength, split tensile strength, modulus of elasticity and flexural strength of M25 grade concrete containing MK and NS are evaluated and the results are compared with the controlled concrete. Based on the test results, it can be observed that concrete prepared with a combination of 5% MK and 2% NS indicated increased strength compared to the controlled concrete.
In this construction world, Geopolymer concrete is a special concrete which doesn't
requires the Ordinary Portland Cement and also reduces the emission of carbon-dioxide. The
Geopolymer Concrete is made up of industrial by-products (which contains more Silica and
Alumina) and activated with the help of Alkaline solution (combination of sodium hydroxide &
sodium silicate or potassium hydroxide & potassium silicate). The high viscosity nature of
Geopolymer Concrete had the ability to fail due to lack of compaction. In improvising the
issue, Self Compacting Geopolymer Concrete has been introduced. The SCGC doesn't require
any additional compaction it will flow and compacted by its own weight. This concrete is made
up of industrial by-products like Fly ash, GGBFS and Silica Fume and activated with alkaline
solution. The earlier research was mostly on Fly ash based SCGC. In few research works Fly
ash was partially replaced with GGBS and Silica Fume. They evaluated the compressive
strength of concrete with varying molarties of NaOH; curing time and curing temperature. The
flexural behavior of the concrete also examined. The Fly ash based SCGC was got high
compressive strength in heat curing as well as low compressive strength in ambient curing.
The presence of GGBS improves the strength in ambient curing. For aiming the high strength
in ambient curing Fly ash will be completely replace and examine with different mineral
admixtures.
IjcA CRITICAL EVALUATION ON POZZOLONIC PROPERTIES OF SELECTED MATERIALS AND T...IAEME Publication
Increase in population in the country is demanding more and more infrastructure projects and
housing which intern is demanding more and more cement manufacturing. This is resulting in
releasing of huge amount of CO2 into the atmosphere which is causing environmental problems.
There is a need to look for alternative materials which lessen emanation of green house gasses. As
a piece of this various alternative materials to cement have been explored by various researchers.
In the present study it is focused on basalt, fly ash, metakaolin, tank sediments, sludge of vitrified
ceramic tile plant, clayey soil and clay deposits. Published articles related to the pozzolonic
materials are collected and complied.
Most relevant papers are sorted out and studied in depth to understand the problems,
methodology, results obtained and conclusions drawn. Metakaolin was tried by several researchers
and it is found to be promising At Present metakaolin available in the market is costly and this cost
factor is one of the constraint in utilization, hence we need to explore alternative low cost materials
that can be used in the place of existing metakaolin after treatment.
The Mechanical Properties of Concrete Incorporating Silica Fume as Partial Re...HARISH B A
Concrete is the most important engineering
material and the addition of some other materials may change
the properties of concrete. With increase in trend towards the
wider use of concrete for prestressed concrete and high rise
buildings there is a growing demand of concrete with higher
compressive strength. Mineral additions which are also
known as mineral admixtures have been used with cements
for many years. Silica fume particles are 100 times smaller
than the average cement particle. Its handling and disposal is
a point of concern because of the environment concerns. Silica
fume is usually categorized as a supplementary cementitious
material. These materials exhibit pozzolanic properties,
cementitious properties and a combination of both properties.
Due to these properties, it can affect the concrete behavior in
many ways. In the present work, an attempt has been made to
use silica fume as a supplementary material for cement and to
evaluate the limit of replacement of cement for M20 grade
concrete. The main aim of this work is to study the
mechanical properties of M20 grade control concrete and
silica fume concrete with different percentages (5, 10, 15 and
20%) of silica fume as a partial replacement of cement.
AN EXPERIMENTAL INVESTIGATION ON THE PERFORMANCE OF HIGH VOLUME GROUND GRANUL...IAEME Publication
This paper reports the effect of high volume of GGBS on the properties of structural
concrete. In this study, GGBS is physically and chemically characterized and partially
replaced in the ratio of 10% to 90% by weight of cement. The fresh properties of GGBS
concrete like slump test and hardened properties like compressive strength, Split tensile
strength, Modulus of Elasticity are carried out. In addition to this the carbon foot prints are
also calculated and the savings per capita per year is determined for reduction of usage of
cement. The test results indicated that fresh and hardened properties of the GGBS concrete
increases as the percentage of replacement of GGBS increases up to certain extent
IJRET : International Journal of Research in Engineering and TechnologyCompar...eSAT Publishing House
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
To mitigate emission of carbon dioxide and other green gases, it is necessary to develop alternative ways by which sustainable development can be improved. This paper discusses various combination of cement with hypo sludge and different size of aggregates. Hypo sludge has a very good content of Cao and thus it works as a partial replacement material in construction process. This study examines 5%, 10%, and 15% replacement of hypo sludge in place of cement in concrete for M20 and then tested for its compressive strength. The result shows that the strength of the concrete increases by adding hypo sludge up to 10%. However, further increase in hypo sludge decreases the compressive strength. Also, rate analysis has been done which concludes that the rate of the concrete decreases on replacing the cement with hypo sludge. The aim of this study is to make eco-friendly building material and to see how the concrete behaves on replacing the cement with the hypo sludge in various proportions. This study also examines the possibility of utilization of hypo sludge as a partial replacement material and it can be further used as cementitious material. It also helps with the disposal and pollution problems associated with paper industry waste
