This document discusses various types of chemical attacks that can occur on concrete, specifically chloride attack, sulphate attack, carbonation, and alkali-aggregate attack. It explains that chloride attack from permeable concrete is one of the leading causes of steel reinforcement corrosion in structures. The passive alkaline layer of concrete can degrade due to carbonation which reduces pH, allowing corrosion. Sulphate attack occurs when sulfates from soil, water, or industrial sources react with concrete compounds and expand in volume, cracking the concrete. Alkali-aggregate reaction involves chemical reactions between aggregate minerals and alkalis in concrete that can also cause cracking.
Mechanism of different chemical attacks in a concrete like chloride attack, sulfate attack , which causes corrosion and spalling. Other reactions are alkali aggregate reaction , alkali silica reaction in concrete etc.
Corrosion of Reinforcement, Carbonation Of Concrete and It's Determination. ..Rushikesh Katkar
The corrosion of reinforcement inside concrete is one of the factors affecting the performance of the structure. Here the presentation will enlighten you about its mechanism and other aspects.
Mechanism of different chemical attacks in a concrete like chloride attack, sulfate attack , which causes corrosion and spalling. Other reactions are alkali aggregate reaction , alkali silica reaction in concrete etc.
Corrosion of Reinforcement, Carbonation Of Concrete and It's Determination. ..Rushikesh Katkar
The corrosion of reinforcement inside concrete is one of the factors affecting the performance of the structure. Here the presentation will enlighten you about its mechanism and other aspects.
Parte 1_Corrosão em concreto armado: técnicas de avaliação, monitoramento, prevenção e reabilitação. Adriana Araújo, Instituto de Pesquisas Tecnológicas do Estado de São Paulo (Instituto de Pesquisas Tecnológicas do Estado de São Paulo).
Corrosion of Aluminum and Its Alloys: Forms of Corrosionijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
It includes mechanism of corrosion of steel reinforcement in concrete. It includes concepts like passivation, chloride ingress and chloride binding. It deals with the durablity aspects of a concrete structure.
Parte 2_Corrosão em concreto armado: técnicas de avaliação, monitoramento, prevenção e reabilitação. Adriana Araújo, Instituto de Pesquisas Tecnológicas do Estado de São Paulo (Instituto de Pesquisas Tecnológicas do Estado de São Paulo).
Parte 1_Corrosão em concreto armado: técnicas de avaliação, monitoramento, prevenção e reabilitação. Adriana Araújo, Instituto de Pesquisas Tecnológicas do Estado de São Paulo (Instituto de Pesquisas Tecnológicas do Estado de São Paulo).
Corrosion of Aluminum and Its Alloys: Forms of Corrosionijceronline
International Journal of Computational Engineering Research (IJCER) is dedicated to protecting personal information and will make every reasonable effort to handle collected information appropriately. All information collected, as well as related requests, will be handled as carefully and efficiently as possible in accordance with IJCER standards for integrity and objectivity.
It includes mechanism of corrosion of steel reinforcement in concrete. It includes concepts like passivation, chloride ingress and chloride binding. It deals with the durablity aspects of a concrete structure.
Parte 2_Corrosão em concreto armado: técnicas de avaliação, monitoramento, prevenção e reabilitação. Adriana Araújo, Instituto de Pesquisas Tecnológicas do Estado de São Paulo (Instituto de Pesquisas Tecnológicas do Estado de São Paulo).
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.
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/
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
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.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
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
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
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.
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.
3. PASSIVE LAYER OF
CONCRETE
The strongly alkaline nature of Ca(OH)2 (pH of
about 13) prevents the corrosion of the steel by
the formation of a thin protective film of iron oxide
on the metal surface. This protection is known as
passivity.
If the concrete is permeable to such an extend
that soluble chlorides penetrate right up to the
reinforcement and water & oxygen is also
present, then the corrosion of steel will take
place. This layer can also be lost due to
carbonation.
4. Corrosion
For corrosion to occur, these elements must be present:
~There must be at least two metals (or two locations on a single
metal) at different energy levels
~ an electrolyte
~ a metallic connection
In reinforced concrete, the rebar may have many separate
areas at different energy levels. Concrete acts as the
electrolyte, and the metallic connection is provided by wire
ties, chair supports, or the rebar itself.
6. CHLORIDE ATTACK
• Chloride attack is one of the most important
aspects while dealing with durability of concrete.
• It primarily causes corrosion of reinforcement.
Statistics have indicated that over 40% of
failure of structures is due to corrosion of
steel.
7. Possibilities of Chloride
attack
•Chloride enters the concrete from the cement, water,
aggregate and sometimes from admixtures. This can also
enter by diffusion from environment if concrete is permeable.
•The Bureau of Indian Standard had specified the maximum
CHLORIDE CONTENT IN CEMENT AS 0.1%.
•The amount of chloride required for initiating corrosion is
partly dependent on the pH value of the pore water in
concrete.
•At a pH value less than 11.5 corrosion may occur
without the presence of chloride.
8. Corrosion of steel due to Carbonation
Carbon dioxide in air or dissolved in water reacts with hydrated
cement systems.
The passive layer can be lost by carbonation due to reduction in alkalinity
of the concrete.
In the presence of moisture and CO2 reacts as
CO2 +H2O H2CO3 (Dil. Carbonic acid)
H2CO3 +Ca(OH)2 CaCO3 +H2O
9. Effects of Carbonation:
Carbonation reduces alkalinity of concrete-
which in turn reduces the passivity of concrete
The corroded volume occupies 6 times the
volume of the original volume.
This trust on concrete results in
spalling,cracking or delamination of cover
concrete
12. SULPHATE ATTACK:
Present in soil in the form of
calcium,sodium,pottasium & magnesium
Ammonium sulphate- water mixed with
fertilizers and sewage from industrial effluents
Natural occurrence- Decay of vegetation and
shallow lakes
13. Formation of sulpho-aluminates
C3A + 3 CS H2 + 26 H C3A(CS)3H32
(sulpho aluminates increases in volume)
Formation of calcium-sulphate:
NS + CH + 2H NH + CS H2
14. Alkali-aggregate reaction
Chemical reactions between aggregate
containing certain reactive constituents
and alkalis (sodium and potassium salts)
Granite, granite gneiss and schist,
quartzite and sandstone, containing
strained quartz are among the reactive
rocks found in India.