Rehabilitation and strengthening of existing structures involves repair techniques, underpinning, and addressing causes of damage. Repair restores structures to their previous condition while rehabilitation considers strength. Retrofitting modifies structures to increase resistance to seismic activity. Common repair techniques include crack injection, routing and sealing cracks, adding reinforcement, prestressing steel, and grouting. Underpinning strengthens foundations by extending them deeper or wider. Mass concrete and mini-pile underpinning are two types. Causes of damage to masonry buildings include heavy weight, low tensile strength, brittle behavior, and weak structural connections.
Techniques for various structural repairUdayram Patil
Structural damage is crucial to safety. Proper remedial measures should always taken to avoid measure loss. This presentation provided various measure to repair structural damage.
This power point presentation gives you information about the various chemicals, admixtures used to repair members and improve the properties of concrete. it gives you information about the various types of concrete. it gives you information about the various methods of repair.
This presentation has been prepared by civil engineering students of Tolani Foundation Gandhidham Polytechnic:
DHAWANI LAVISH
GAYAKWAD TEJAS
GORASIYA MAYUR
HIRANI YATIN
KATARMAL DARSHAN
LALWANI PIYUSH
MALI VISHNU
PATEL PARTH
PRAJAPATI JAYESH
PRAJAPATI KALPESH
Thank You!!
Techniques for various structural repairUdayram Patil
Structural damage is crucial to safety. Proper remedial measures should always taken to avoid measure loss. This presentation provided various measure to repair structural damage.
This power point presentation gives you information about the various chemicals, admixtures used to repair members and improve the properties of concrete. it gives you information about the various types of concrete. it gives you information about the various methods of repair.
This presentation has been prepared by civil engineering students of Tolani Foundation Gandhidham Polytechnic:
DHAWANI LAVISH
GAYAKWAD TEJAS
GORASIYA MAYUR
HIRANI YATIN
KATARMAL DARSHAN
LALWANI PIYUSH
MALI VISHNU
PATEL PARTH
PRAJAPATI JAYESH
PRAJAPATI KALPESH
Thank You!!
This topic discusses in general about the repair, maintenance and their strategies to be followed. It is also discussed about the assessment procedures and investigations to be done while repairing any structures.
This topic discusses in general about the repair, maintenance and their strategies to be followed. It is also discussed about the assessment procedures and investigations to be done while repairing any structures.
EXCAVATION FOR FOUNDATION - Methods & Temporary Earth Retaining StructuresShivananda Roy
Generally excavation means to loosen and take out materials leaving space above or below ground. Sometimes in civil engineering term earthwork is used which include back-filling with new or original materials to voids, spreading and leveling over an area.
The presentation includes difference between repair, retrofitting and rehabilitation. methods of repairs, repair materials, various methods for retrofitting etc.
Construction Industry is one of the most booming industries in the whole world. This industry is mainly an urban based one which is concerned with preparation as well as construction of real estate properties. The repairing of any existing building or making certain alterations in the same also comes under construction Industry.
Social stratification is a kind of social differentiation whereby a society groups people into socioeconomic strata, based upon their occupation and income, wealth and social status, or derived power.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Rehabilitation and strengthening of existing structures
1.
2. REHABILITATION AND STRENGTHENING
OF EXISTING STUCTURES
1
• INTRODUCTION
2
• REPAIR TECHNIQUES
3
• UNDERPINNING
4
• CAUSES OF DAMAGE EXISTING MASONARY
BUILDINGS
3. INTRODUCTION
Repair: To bring back the position of the structure to its
previous condition so it gives performance same as
previously. It doesn’t cover the strength aspect of the
structures.
Some examples of repair…….
Decoration of structure,Painting,WhiteWashing
Checking the wiring of building
Replastering of any wall if required
Repairing of damaged flooring
Repair of door and window
Checking or repairing of pipe line connections, gas line
connections and plumbing serveries.
4. INTRODUCTION
Rehabilitation : Rehabilitation of a building means
returning a building or a structure to a useful state by
means of repair, modification, or giving strength to
structure.
It is related to the strength aspect of structures.
To Bring back the position and condition of the structure
by considering the strength aspect.
Some of the examples of Rehabilitation…
To fill the wide cracks using some suitable material
Injecting epoxy like material in to cracks in walls ,
columns , beams, etc.
Removal of damaged portion of masonry and
reconstructing it using rich mortar mix.
5. INTRODUCTION
Retrofitting:
It is the modification of existing
structures to make them more resistant to
seismic activity, ground motion, or soil
failure due to
earthquakes.
6. INTRODUCTION
When is Seismic Retrofitting Needed ?
The two circumstances are:-
Earthquake damaged buildings, and Earthquake-
vulnerable buildings(with no exposure to severe
earthquakes)
Some examples of retrofitting ………
Increasing the lateral strength by reinforcement or by
increasing wall areas or the numbers of walls and
columns
Giving unity to the structure by providing a proper
connection between resisting elements.
Avoiding the possibility of brittle modes of failure by
proper reinforcement and connection of resisting
members.
7. REPAIR METHODOLOGY
Evaluation
Relating observation to causes
Selecting methods and materials
Preparation of drawings and specifications
Selection of a contractor
Execution of the work
Quality Control
8. MATERIALS FOR CRACK REPAIR
The various materials used for repairs of
cracks are:
Cement Slurry
Cement Mortar
Epoxy resin
10. CRACK REPAIR TECHNIQUES
Epoxy-injection Grouting
Cracks as narrow as 0.002 in. (0.05 mm) can be
bonded by the injection of epoxy. The technique
generally consists of sealing the crack on exposed
surfaces, and injecting the epoxy under pressure.
Epoxy injection has been successfully used in
the repair of cracks in :
Buildings
Bridges
Dams and other types of concrete structures.
11. CRACK REPAIR TECHNIQUES
The general procedure are given below:
Clean the cracks: The first step is to clean the cracks that
have been contaminated.
Contaminants such as oil, grease, dirt, or fine particles of
concrete prevent epoxy
Contamination should be removed by vacuuming or
flushing with water or other specially effective cleaning
solutions.
Seal the surfaces:
Surface cracks should be sealed to keep the epoxy from
leaking out before it has gelled.
A surface can be sealed by applying an epoxy, polyester,
or other appropriate sealing material to the surface of the
crack and allowing it to harden.
12. CRACK REPAIR TECHNIQUES
Inject the epoxy: Hydraulic pumps may be used for injection. The
pressure used for injection must be selected carefully. Increased
pressure often does little to accelerate the rate of injection. If the
crack is vertical or inclined, the injection process should begin by
pumping epoxy into the entry port at the lowest elevation until the
epoxy level reaches the entry port above.
For horizontal cracks, the injection should proceed from one end
of the crack to the other in the same manner. The crack is full if
the pressure can be maintained. If the pressure can not be
maintained, the epoxy is still flowing into unfilled portions or
leaking out of the crack.
Remove the surface seal: After the injected epoxy has cured, the
surface seal should be removed by using hammer.
22. GROUTING
Grouting is a process of injecting mixture of
cement, sand water at high pressure in the
cracks, joints, voids etc.
Purpose of grouting:
To strengthen the porous Concrete
To prevent the seepage in dam and water
retaining structures
To fill the cracks in concrete structure
23. GROUTING
Procedure for grouting:
Drilling of Grouting holes
For drilling grouting holes, equipment's like jack hammer, diamond drill,
shot drill etc are used. The choice of type of drilling equipment depends
upon the type of stone, size of hole and depth of hole.
Arrangement of grout pipes
Grout pipes or packer of 4 to 5 cm dia and 45 to 90 cm length are
inserted in the grout holes. The space surrounding the pipe is filled with
cement mortar. The top end of the pipe is connected to the pump.
Cleaning of cracks
Before injecting grout mixture in the cracks, it is necessary to clean the
cracks.
Inserting grout in holes
Normally grout is inserted in the holes at a pressure 0.65kg/cm2 per m
depth hole.
24. GROUTING
Types of grouting:
1. Consolidation Grouting:
This type of grouting is used for shallow depth grouting holes.
Normally pressure below 3 kg/cm2 is known as low pressure
grouting.
2. Stage grouting:
When thick layers are to be grouted the total thickness of layer is
divided into stages of 1m each and grouting of each layer is
carried out one by one. Grouting of upper layer is started only
after the grout in the lower layer had properly set.
3. Curtain Grouting:
This type of grouting is done to prevent the seepage of water
below foundation of dam.
26. PORTLAND CEMENT GROUTING
This type of grouting is particularly used in dams and thick walls.
This method is effective in preventing water leakage.
First of all clean the cracks by air jetting or water jetting.
Flushing the crack to clean it.
Installing grout at suitable interval and seal the crack .
Then grout the whole area.
Grout mixtures may contain cement and water or cement plus
sand and water,depending upon the width of crack
Water reducers or admixtures may be used to improve the
properties of the grout.
For large volumes , a pump is used and for small volumes ,a
manual injection gun may be used for injection of grouting.
After the crack is filled, the pressure should be maintained to
ensure proper penetration of grout.
31. UNDERPINNING
DEF: In construction, underpinning is the process
of strengthening and stabilizing the
foundation of an existing building or other structure.
Reasons for Underpinning
• The original foundation is simply not strong or
stable enough.
• The usage of the structure has changed.
• The properties of the soil supporting the
foundation may have changed (possibly through
subsidence) or were mischaracterized during
design.
32. PROCESS OF UNDERPINNING
Underpinning is accomplished by extending
the foundation in depth or in breadth so it
either rests on a more supportive soil stratum
or distributes its load across a greater area.
All of these processes are generally
expensive and elaborate.
34. MASS CONCRETE UNDERPINNING
• Also known as 'traditional underpinning, 'This
underpinning method strengthens an existing
structure's foundation by digging boxes by hand
underneath and sequentially pouring concrete in a
strategic order. The final result is basically a
foundation built underneath the existing foundation.
This underpinning method is generally applied when
the existing foundation is at a shallow depth,
however, the method still works very well even at fifty
feet deep. The method has not changed since its
inception with its use of utilitarian tools such as
shovels and post hole diggers. Heavy machinery is
not called for in this method due to the tight nature
of the boxes being dug.
35. MINI-PILED UNDERPINNING
Mini-piles have the greatest value where
ground conditions are very variable,where
access is restrictive.
Mini-piled underpinning is generally used
when the loads from the foundations need to
be transferred to stable soils at considerable
depths - usually in excess of 5.0 meters.
36. CAUSES OF DAMAGE OF MASONRY
BUILDINGS
Heavy Weight and very stiff buildings, attracting large
seismic forces.
Very low tensile strength particularly with poor mortars
Low shear strength
Brittle behavior in tension as well as in compression
Weak connection between wall and wall
Weak connection between roof and wall
Stress connection at corners of doors and windows
Overall unsymmetry in plan and elevation of buildings