There are two main types of concrete mixers: batch mixers that mix concrete in batches that must be fully emptied and cleaned between batches, and continuous mixers that continuously produce concrete. Batch mixers can be horizontal drum mixers or vertical pan mixers. Drum mixers have fixed blades inside a rotating drum while pan mixers have either a rotating pan or blades. Continuous mixers are non-tilting drums with rotating screw-type blades that continuously feed and discharge concrete.
The discussion on rehabilitation of foundations were discussed. The types used for rehabilitation were explained with the procedure. in addition, the case study under each type were also discussed for better understanding of the subject.
Seismic retrofitting is a collection mitigation technique for earthquake engineering.
It is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquake.
It is of utmost important for historic monuments, areas prone to severe earthquakes and tall or
expensive structures.
The retrofitting techniques are also applicable for other natural hazards such as tropical cyclones, tornadoes and severe winds from thunderstorms.
Retrofitting proves to be a better economic consideration and immediate shelter to problems
rather than replacement of building.
The discussion on rehabilitation of foundations were discussed. The types used for rehabilitation were explained with the procedure. in addition, the case study under each type were also discussed for better understanding of the subject.
Seismic retrofitting is a collection mitigation technique for earthquake engineering.
It is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquake.
It is of utmost important for historic monuments, areas prone to severe earthquakes and tall or
expensive structures.
The retrofitting techniques are also applicable for other natural hazards such as tropical cyclones, tornadoes and severe winds from thunderstorms.
Retrofitting proves to be a better economic consideration and immediate shelter to problems
rather than replacement of building.
It is used as a mould for a structure in which fresh concrete is poured only to harden subsequently.
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It is used as a mould for a structure in which fresh concrete is poured only to harden subsequently.
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beam formwork
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types of formwork
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what is formwork in construction
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International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Introduction to Concrete
Manufacturing of Concrete
Types of Concrete
Properties of Concrete
Advantage of Concrete
Uses of Concrete
Various Tests for Concrete
Innovations…
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
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Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
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Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
2. HARDWARE: THE MIXERS
There are two main categories of mixer: batch mixers and
continuous mixers. The first type of mixer produces concrete one
batch at a time, while the second type produces concrete at a
constant rate. The first type needs to be emptied completely after
each mixing cycle, cleaned (if possible), and reloaded with the
materials for the next batch of concrete. In the second type, the
con- stituents are continuously entered at one end as the fresh
concrete exits the other end
BATCH MIXERS
Two main types of batch mixer can be distinguished by the
orientation of the axis of rotation: horizontal or inclined (drum
mixers) or vertical (pan mixers). The drum mixers have a drum, with
fixed blades, rotating around its axis, while the pan mixers may have
either the blades or the pan rotating around the axis.
3. DRUM MIXERS
All the drum mixers have a container purpose The blades are attached to the
inside of the movable drum. Their main is to lift the materials as the drum
rotates. In each rotation, the lifted material drops back into the mixer at the
bottom of the drum and the cycle starts again. Parameters that can be
controlled are the rotation speed of the drum and, in certain mixers, the
angle of inclination of the rotation axis. There are three main types of drum
mixers:
• non-tilting drum; • reversing drum; • tilting drum.
The non-tilting drum mixer implies that the orientation of the drum is fixed.
The materials are added at one end and discharged at the other .
The reversing drum is similar to the non-tilting mixer except that the same
opening is used to add the constituents and to discharge concrete. The drum
rotates in one direction for mixing and in the opposite direction for
discharging the concrete. There are two types of blades attached to the inner
walls of the drum. One set drags the concrete upwards and toward the center
of the mixer when the drum rotates in one direction; the second set of blades
pushes the concrete toward the opening when the drum rotates in the other
direction. The blades have a spiral arrangement to obtain the desired effect
for discharge and mixing.
4. PAN MIXERS
All pan mixers work on basically the same principle [3]: a
cylindrical pan (fixed or rotating) contains the concrete to be
mixed, while one or two sets of blades rotate inside the pan to mix
the materials and a blade scrapes the wall of the pan. The shapes
of the blades and the axes of rotation vary. The other element of
the mixer is the scraper.
CONTINUOS MIXERS
The second category of mixers is continuous mixers . As the name
indicates, the materials are continuously fed into the mixer at the
same rate as the concrete is discharged. They are usually non-tilting
drums with screw-type blades rotating in the middle of the drum.
The drum is tilted downward toward the discharge opening. The
mixing time is determined by the slope of the drum (usually about
15 degrees).
These mixers are used for applications that require a short working
time, long unloading time, remote sites (not suitable for ready-mix)
and/or small deliveries. A major use of these types of mixers is for
low slump concrete
7. PRESSURE GROUTING
Pressure grouting involves injecting a grout material into generally
isolated pore or void space of which neither the configuration or
volume are known, and is often referred to simply as grouting. The
grout may be a cementitious, resinous, or solution chemical mixture.
The greatest use of pressure grouting is to improve geomaterials (soil
and rock). The purpose of grouting can be either to strengthen or
reduce water flow through a formation. It is also used to correct
faults in concrete and masonry structures. Since first usage in the
19th century, grouting has been performed on the foundation of
virtually every one of the world’s large dams, in order to reduce the
amount of leakage through the rock, and sometimes to strengthen
the foundation to support the weight of the overlying structure, be it
of concrete, earth, or rock fill. Although very specialized, pressure
grouting is an essential construction procedure that is practiced by
specialist contractors and engineers around the world.
12. REINFORCEMENT CORROSION
Cement content and
type
w/c ratio
carbonation
Stray currents
curing
rainfall
Temperature/humidity
Corrosive
contaminants
Chloride salts
Sea water
Road salt
Other
contaminents
13. REPAIRS OF CONCRETE STRUCTURES
Shotcrete
Shotcrete is, in effect, a version of a cast-in-place concrete wall. Rather than
placing concrete into forms, however, a fresh mix is sprayed onto wall panels that
have been erected in the shape of the building. A nozzleman applies concrete
from a pressurized hose to encompass the reinforcement and build up the wall
thickness, forming structural shapes that include walls, floors, roofs, and other
assemblies. This material has also been called “gunite” in reference to the nozzle
or “gun” used to shoot material at the form face. Any surface suitable for
accepting fresh concrete can be used: wood, steel, and polystyrene are common.
Finishes are often applied directly to the concrete while it is still wet.
Shotcrete is a method of applying a combination of sand and portland
cement which mixed pneumatically and conveyed in dry state to the nozzle of
a pressure gun, where water is mixed and hydration takes place just prior to
expulsion. The material bonds perfectly to properly prepared surface of
masonry and steel. In versatility of application to curved or irregular
surfaces, its high strength after application and good physical
characteristics, make for an ideal means to achieve added structural
capability in walls and other elements. There are some minor restrictions of
clearance, thickness, direction of application, etc.
15. EPOXY RESINS
Epoxy resins are excellent binding agents with high tensile strength. There are
chemi- cal preparations the compositions of which can be changed as per
requirements. The epoxy components are mixed just prior to application. The
product is of low vis- cosity and can be injected in small cracks too.
The higher viscosity epoxy resin can be used for surface coating or filling larger
cracks or holes. The epoxy mixture strength is dependent upon the temperature of
cur- ing (lower strength for higher temperature) and method of application
16. Epoxy mortar
For larger void spaces, it is possible to com- bine epoxy resins of either
low viscosity or higher viscosity, with sand aggregate to form epoxy
mortar. Epoxy mortar mixture has higher compressive strength, higher
tensile strength and a lower modulus of elasticity than Portland cement
concrete. Thus the mortar is not a stiff material for replacing reinforced
concrete. It is also re- ported that epoxy is a combustible material.
Therefore it is not used alone. The sand aggregate mixed to form the
epoxy mortar provides a heat sink for heat generated and it provides
increased modulus of elasticity too.
Quick setting cement mortar
This material is patented and was originally developed for the use as a
repair material for reinforced concrete floors adjacent to steel blast
furnaces. It is a non-hydrous magnesium phosphate cement with two
components, a liquid and a dry, which can be mixed in a manner similar
to portland cement concrete.
17. STRENGHTHENING RC MEMBERS
The strengthening of reinforced concrete members is a task that should be
carried out by a structural engineer according to calculations. Here only a few
suggestions are included to illustrate the ways in which the strengthening
could be done.
(i) RC columns can best be strengthened by jacketing, and by providing
additional cage of longitudinal and lateral tie reinforcement around the
columns and casting a concrete ring, the desired strength and ductility can
thus be built-up.
(ii) Jacketing a reinforced concrete beam can also be done in the above
manner. For holding the stirrup in this case, holes will have to be drilled
through the slab.
(iii) Similar technique could tie used for strengthening RC shear walls.
(iv) Inadequate sections of RC column and beams can also be strengthened
by removing the cover to old steel, welding new steel to old steel and
replacing the cover.
(v) RC beams can also be strengthened by applying prestress to it so that opposite moments are caused to those applied. The wires will run on both sides
of the web outside and an- chored against the end of the beam through a
steel plate.