This document discusses various topics related to fresh and hardened concrete including:
- Workability of fresh concrete and factors that affect it. Common tests to measure workability include slump, compacting factor, flow, and Vee Bee tests.
- Setting time refers to the initial and final set of concrete and is important for proper placement and compaction.
- Properties of fresh concrete include workability, slump loss, segregation, plastic shrinkage, temperature. Properties that influence long-term performance include strength, permeability, durability, shrinkage and creep.
- Compressive strength is a key property of hardened concrete and depends on water-cement ratio and degree of compaction. Other
Properties of Fresh and Hardened ConcreteRishabh Lala
Properties of Fresh (Workability)
Hardened Concrete (Workability,Permiablitiy,Durablility)
Thermal properties
Micro-cracking of concrete
Mix Design
Rheology
Causes of Damage of Concrete
Here, I attach a PowerPoint presentation created by me for a competition held by UltraTech. Have a look at this and feel free to share your views with me.
Properties of Fresh and Hardened ConcreteRishabh Lala
Properties of Fresh (Workability)
Hardened Concrete (Workability,Permiablitiy,Durablility)
Thermal properties
Micro-cracking of concrete
Mix Design
Rheology
Causes of Damage of Concrete
Here, I attach a PowerPoint presentation created by me for a competition held by UltraTech. Have a look at this and feel free to share your views with me.
Concrete -
The most used construction material.
In here a brief about its -
Ingredients
Grades
Production &
Properties
are discussed with appropriate pictorial presentation making it quite simpler for understanding.
The presentation that will cover the main topics of concreting methods in cold weather and discussion about the durabiity of concrete and also useful tips for designing the mix of concrete
The project was undertaken to design M50 grade concrete using GGBS cement and POZZOLANA cement and comparing the fresh concrete and hard concrete properties with concrete designed using conventional cement.
concrete, presentation includes ingredients of concrete , how we can achieve high strength of concrete in less days of curing, practically shown in the presentation according to the standards of ACI.
Concrete Grades: Types of Concrete Grade and their usesRakesh Patel
Concrete is ubiquitous at all construction sights. This may make people wonder whether there is even anything in concrete that requires planning and decision making. As a matter of fact, there are several quality details of concrete which have to be examined before you finalize on choosing one.
THIS PRESENTATION IS MAINLY OCCUPIED IN CE 6002 CONCRETE TECHNOLOGY UNIT NO.03......
-------FOR CIVIL ENGINEERING STUDENTS IN 2013 REGULATION =-------------------------
DEAR FRIENDS ,,,,
THIS POWERPOINT PRESENTATION MAY INCLUDE ON CE 6002 CONCRETE TECHNOLOGY UNIT 5 FOR FIFTH SEMESTER CIVIL ENGINEERING STUDENTS (2013_ REGULATION)
G.GUNA
AP / CIVIL
SRVEC
Concrete -
The most used construction material.
In here a brief about its -
Ingredients
Grades
Production &
Properties
are discussed with appropriate pictorial presentation making it quite simpler for understanding.
The presentation that will cover the main topics of concreting methods in cold weather and discussion about the durabiity of concrete and also useful tips for designing the mix of concrete
The project was undertaken to design M50 grade concrete using GGBS cement and POZZOLANA cement and comparing the fresh concrete and hard concrete properties with concrete designed using conventional cement.
concrete, presentation includes ingredients of concrete , how we can achieve high strength of concrete in less days of curing, practically shown in the presentation according to the standards of ACI.
Concrete Grades: Types of Concrete Grade and their usesRakesh Patel
Concrete is ubiquitous at all construction sights. This may make people wonder whether there is even anything in concrete that requires planning and decision making. As a matter of fact, there are several quality details of concrete which have to be examined before you finalize on choosing one.
THIS PRESENTATION IS MAINLY OCCUPIED IN CE 6002 CONCRETE TECHNOLOGY UNIT NO.03......
-------FOR CIVIL ENGINEERING STUDENTS IN 2013 REGULATION =-------------------------
DEAR FRIENDS ,,,,
THIS POWERPOINT PRESENTATION MAY INCLUDE ON CE 6002 CONCRETE TECHNOLOGY UNIT 5 FOR FIFTH SEMESTER CIVIL ENGINEERING STUDENTS (2013_ REGULATION)
G.GUNA
AP / CIVIL
SRVEC
HAI FRIENDS .... THIS IS GUNA ... ITS VERY USEFULL ONE..
TRY IT AND DOWNLOAD IT....
THIS PPT MAINLY UPLOADED ON 2013 REGULATION FIFTH SEMESTER CIVIL ENGINEERING STUDENTS.... OTHER UNITS WILL BE UPLOAD SOON...
BY
GUNA.G
AP / CIVIL
LODHA SPLENDORA
Pre-launch of Phase 2 with new towers at Lodha Splendora at Ghodbunder Road, Thane. With all approvals in place and ready amenities like functional grand clubhouse, making this pre-launch a blockbuster opportunity with zero risk.
Effects of Additives on Concrete Performancefye7884
Concrete is a very important building material and known by its name worldwide.
In this presentation we discuss the performance which affects the strength,durability and workability of concrete.
If we add some additives to the concrete then the properties will also change and these are discussed and shown.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Fresh concrete -building materials for engineersmusadoto
General introduction
CONCRETE
is a building Material made from a mixture of gravel ,sand ,cement,water and air ,forming a stone like mass on hardenning.
FRESH CONCRETE
It is a concrete that has not reached the final setting time.
Hi viewers, I am back with the various concepts of TYPES OF TESTS ON CONCRETE for civil engineers.
Here, i explained few topics
What is a concrete? Classification based o state of concrete? and various tests?
Predicting the Workability of Fresh Concrete Using Simple Pull-out TestIJRESJOURNAL
ABSTRACT: Workability is one of the physical parameters of concrete which affect strength and durability as well as cost of labour and appearance of the finished product. It is a vital property of concrete that must be measured correctly to ensure good quality concrete. This research study is directed towards exploring the pullout test as an alternative test for workability of fresh concrete. The study measured the slump, compacting factor and pull-out strength for fresh concrete with water/cement ratios of 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8 representing very low, medium and high workability. Result showed that a pull-out strength of 72 – 94N/mm2 is required for concrete of very low degree of workability while pull-out strength of 62 – 65N/mm2 is required for concrete of high degree of workability in accordance with the requirement of Road Note No. 4. The result was validated by comparing measured and calculated compacting factor and the average ratio of calculated and measured compactive factor was found to be 1.01. The calibration of calculated and measured compacting factor resulted in coefficient of determination R2 of 0.998. These results indicate that pull-out strength is a good predictor of compacting factor and by extension workability of fresh concrete. The simple pull-out test was recommended as an alternative test to compacting factor, slump and V-B consistometer tests in measuring workability of fresh concrete.
special concrete and high performance concreteErankajKumar
GROUTING OF CONCRETE, advantage ofGrouting,Characteristics of Grouting, GUNTING OF
CONCRETE, Application of Guniting, Properties of Guniting, advantage and disadvantage of Guniting, UNDERWATER CONCRETING, Properties of underwater concrete, METHODS OF UNDERWATER CONCRETE, advantage and disadvantage of underwater concrete, HOT WEATHERING CONCRETE, precautions, COLD WEATHER CONCRETING, PUMPABLE CONCRETE, Requirements of Mix Design for Pumpable Concrete, Ready Mixed Concrete RMC, Types of Ready Mixed Concrete, advantage and disadvantage of ready mixed concrete, introduction in High performance concrete HPC, selection of materials, behaviour of fresh high performance concrete HPC , behaviour of Hardened High performance concrete HPC when to use High performance concrete HPC , application of HPC , Advantage of HPC , Limitations of HPC
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
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.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
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An Approach to Detecting Writing Styles Based on Clustering Techniquesambekarshweta25
An Approach to Detecting Writing Styles Based on Clustering Techniques
Authors:
-Devkinandan Jagtap
-Shweta Ambekar
-Harshit Singh
-Nakul Sharma (Assistant Professor)
Institution:
VIIT Pune, India
Abstract:
This paper proposes a system to differentiate between human-generated and AI-generated texts using stylometric analysis. The system analyzes text files and classifies writing styles by employing various clustering algorithms, such as k-means, k-means++, hierarchical, and DBSCAN. The effectiveness of these algorithms is measured using silhouette scores. The system successfully identifies distinct writing styles within documents, demonstrating its potential for plagiarism detection.
Introduction:
Stylometry, the study of linguistic and structural features in texts, is used for tasks like plagiarism detection, genre separation, and author verification. This paper leverages stylometric analysis to identify different writing styles and improve plagiarism detection methods.
Methodology:
The system includes data collection, preprocessing, feature extraction, dimensional reduction, machine learning models for clustering, and performance comparison using silhouette scores. Feature extraction focuses on lexical features, vocabulary richness, and readability scores. The study uses a small dataset of texts from various authors and employs algorithms like k-means, k-means++, hierarchical clustering, and DBSCAN for clustering.
Results:
Experiments show that the system effectively identifies writing styles, with silhouette scores indicating reasonable to strong clustering when k=2. As the number of clusters increases, the silhouette scores decrease, indicating a drop in accuracy. K-means and k-means++ perform similarly, while hierarchical clustering is less optimized.
Conclusion and Future Work:
The system works well for distinguishing writing styles with two clusters but becomes less accurate as the number of clusters increases. Future research could focus on adding more parameters and optimizing the methodology to improve accuracy with higher cluster values. This system can enhance existing plagiarism detection tools, especially in academic settings.
3. 3
Requirement of Fresh Concrete
Workability is the property of concrete which
determine the amount of useful internal work necessary to
produce full compaction.
G.GUNA SRVEC
4. G.GUNA SRVEC 4
Factors affecting Workability
Measurement of Workability
Slump Test
Compacting Factor Test
Flow Test
Kelly Ball Test
Vee Bee Test
6. 6G.GUNA SRVEC
Concrete is filled in top hopper
1 meter high
Allowed to drop in second
hopper
Concrete is dropped from
second hopper into cylinder
and leveled
Weighed and emptied
Filled with fully compacted
concrete and weighed again
Ratio of fallen weight to fully
compacted concrete is
compacting factor
7. 7G.GUNA SRVEC
Slump cone test
is performed in a
closed cylinder
of 300 mm dia.
Perspex plate is
placed on top.
Vibration are
applied at
standard rate till
plate is fully in
contact.
Time in
second to
achieve state
of concrete
shown below
is called
Vee Bee
8. G.GUNA SRVEC 8
Conical mould is filled with concrete and placed in
centre of board.
Board is raised and dropped 15 times
Spread of concrete is measured and is called
Flow
9. 9G.GUNA SRVEC
Setting Time Of Concrete
Setting of concrete is caused by water cement reaction.
Setting time of cement and concrete do not coincide.
Initial and final setting times are arbitrarily defined by method of
penetration of needle
Final set of concrete do not mean complete loss of workability.
Initial set represent time after which concrete can not be mixed
placed and compacted properly.
10. G.GUNA SRVEC 10
Properties of fresh and hardened concrete
The potential strength and durability of concrete
of a given mix proportion is very dependent on the degree
of its compaction. It is vital, therefore, that the
consistency of the mix be such that the concrete can be
transported, placed, and finished sufficiently early
enough to attain the expected strength and durability.
Properties of Fresh Concrete:
The first 48 hours are very important for the performance of
the concrete structure.
It controls the long-term behavior, influence f'c (ultimate
strength), Ec (elastic modulus), creep, and durability.
Properties at Early Ages :
• Workability
• Slump Loss
• Segregation/Bleeding
• Plastic Shrinkage
• Time of Set
• Temperature
11. G.GUNA SRVEC 11
Workability :
Definition: Effort required to manipulate a concrete mixture with a minimum of
segregation.
It is not a fundamental property of concrete.
I) consistency (slump)-- easy to flow
II) cohesiveness --tendency to bleed and segregate
Slump Test:
Slump test is a test conducting before concrete to
be used for casting. The purpose of slump test
Is to determine the water content in concrete and its workability
Consistency:
Consistency or fluidity of concrete is an important component of
workability and refers in a way to the wetness of the concrete.
However, it must not be assumed that the wetter the mix the more workable it is.
If a mix is too wet, segregation may occur with resulting honeycomb, excessive
bleeding, and sand streaking on the formed surfaces.
On the other hand, if a mix is too dry it may be difficult to place and compact,
and segregation may occur because of lack of
cohesiveness and plasticity of the paste.
12. G.GUNA SRVEC 12
PROPERTIES OF
HARDENED CONCRETE
The principal properties of hardened concrete which are of
practical importance can be listed as:
1) Strength
2) Permeability & durability
3) Shrinkage & creep deformations
4) Response to temperature variations
Of these compressive strength is the most important
property of concrete.
Of the abovementioned hardened properties compressive
strength is one of the most important property that is often required,
simply because;
1) Concrete is used for compressive loads
2) Compressive strength is easily obtained
3) It is a good measure of all the other properties.
13. G.GUNA SRVEC 13
The strength of a concrete specimen prepared, cured
and tested under specified conditions at a given age
depends on:
1. w/c ratio
2. Degree of compaction
Compressive Strength is determined by loading properly
prepared and cured cubic, cylindrical or prismatic
specimens under compression.
Permeability is important because:
1. The penetration of some aggresive solution may result in
leaching out of Ca(OH)2 which adversely affects the
durability of concrete.
2. The moisture penetration depends on permeability & if
concrete becomes saturated it is more liable to frost-action.
3. In some structural members permeability itself is of
importance, such as, dams, water retaining tanks.
14. G.GUNA SRVEC 14
DURABILITY
A durable concrete is the one which will withstand in a
satisfactory degree, the effects of service conditions to which it will be
subjected.
Factors Affecting Durability:
External → Environmental
Internal → Permeability, Characteristics of ingredients, Air-Void
System...
SULFATE ATTACK
Ground water in clayey soils containing alkali sulfates may affect
concrete.
These solutions attack CH to produce gypsum. Later, gypsum and
calcium alumina sulfates together with water react to form
“ettringite”.
Formation of ettringite is hardened cement paste or concrete leads
to volume expansion thus cracking.
Moreover, Magnesium sulfate may lead to the decomposition of the
C-S-H gel.
15. G.GUNA SRVEC 15
CORROSION
Electrochemical reactions in the steel rebars of a R/C structure
results in corrosion products which have larger volumes than
original steel.
Thus this volume expansion causes cracks in R/C. In fact, steel
is protected by a thin film provided by concrete against corrosion.
However, that shield is broken by CO2 of air or the Cl- ions.