Curing is maintaining moisture and temperature in concrete to allow desired properties to develop. Proper curing increases strength, durability, and resistance to freezing and thawing. Self-curing concrete uses curing compounds to seal the surface and retain moisture as hydration occurs. Curing compounds form a hydrophobic film that water molecules cannot escape through, reducing evaporation. Common types include acrylic and chlorinated rubber. Proper application ensures a uniform coating is achieved.
Self curing concrete is , defines self-curing concrete as “the process by which small inclusions dispersed within the concrete hold the water during mixing and up to the setting time and release it during cement hydration.”
Self-curing concrete is achieved by means of replacing a part of aggregate by lightweight aggregate or adding chemical admixtures. The self-curing process of concrete takes place from inside to outside, thus reducing the autogenous shrinkage and self-desiccation, especially for the high-performance concrete with relatively low water/binder ratio.
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Self curing concrete is , defines self-curing concrete as “the process by which small inclusions dispersed within the concrete hold the water during mixing and up to the setting time and release it during cement hydration.”
Self-curing concrete is achieved by means of replacing a part of aggregate by lightweight aggregate or adding chemical admixtures. The self-curing process of concrete takes place from inside to outside, thus reducing the autogenous shrinkage and self-desiccation, especially for the high-performance concrete with relatively low water/binder ratio.
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WATERPROOFING,Damp proofing, Common Water Damage problems ,Benefits of Waterproofing,How Water can penetrate Concrete Strctures,Why Waterpoofing is Important,What could happen if a building isn’t waterproof , Importance of waterproofing in building ,Waterproofing Methods,Cementitious Waterproofing
Liquid Waterproofing Membrane,
Bituminous Membrane
Bituminous Coating
Polyurethane Liquid Membrane,
Problem solution for waterproofing,What is concrete cancerSix Common cause of concrete cancer include
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.
Effective use of crystalline waterproofing technology will reduce the
porosity and permeability of conventional concrete, and provide the high performance
advantages and benefits that building owners and design professionals have come to rely
upon in design and construction projects.
WATERPROOFING,Damp proofing, Common Water Damage problems ,Benefits of Waterproofing,How Water can penetrate Concrete Strctures,Why Waterpoofing is Important,What could happen if a building isn’t waterproof , Importance of waterproofing in building ,Waterproofing Methods,Cementitious Waterproofing
Liquid Waterproofing Membrane,
Bituminous Membrane
Bituminous Coating
Polyurethane Liquid Membrane,
Problem solution for waterproofing,What is concrete cancerSix Common cause of concrete cancer include
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.
Effective use of crystalline waterproofing technology will reduce the
porosity and permeability of conventional concrete, and provide the high performance
advantages and benefits that building owners and design professionals have come to rely
upon in design and construction projects.
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.
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• 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.
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.
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
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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.
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.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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/
2. What is curing of concrete?
• Curing is the maintenance of a satisfactory moisture
content and temperature in concrete for a period of
time immediately following placing and finishing so
that the desired properties may develop.
• Curing has a strong influence on the properties of
hardened concrete ; proper curing will increase,
durability, strength, watertightness, abrasion
resistance, volume stability, and resistance to
freezing and thawing etc.
3. Hydration of cement:
2C3S + 6H --------> C3S2H3 + 3 Ca(OH)2
100 + 24---------> 75 + 49
2C2S + 4H --------> C3S2H3 + Ca(OH)2
100 + 21 ---------> 99 + 22
• C3S requires 24% and c2s requires 21% of water by
weight of cement. It has been estimated that avg. 23%
is required for complete chemical reaction.
• It has been also estimated that about 15% water by wt.
Of cement is requires to fill up the gel pores.
• So total 38% of water is requires by wt. Of cement for
complete hydration process.
4. • In all this it is assumed that hydration is taking
place in sealed container, where moisture
evaporation does not take place.
• Excess or lack of water
may cause undesirable
Capillary cavities.
5. DEFINATION OF CURING;
(as per ACI-308R)
• The term "curing" is frequently used to
describe the process by which hydraulic-
cement concrete matures and develops
hardened properties over time as a result of
the continued hydration of the cement in the
presence of sufficient water and heat.
(as per IS:456-2000 )
• “ curing is the process of preventing the loss
of moisture from the concrete.”
6. Types Of Curing
a) Water curing:
• immersion
• Ponding
• Spraying
• Wet covering
b) Steam curing
c) Self curing/ membrane curing
d) miscellaneous:
like, curing by infra red radiation, electrical curing etc.
7. What is self curing concrete?
• It has been pointed out earlier that curing
does not means application of water ,it means
also creation of condition for promotion of
Uninterrupted and Progressive hydration.
• It is also pointed out that the quantity of
water, normally mixed for making concrete is
sufficient to hydrate the cement content.
8. (…cntd. )
• Concrete in which the mixing water is
restricted by means of some chemical
compounds, to go out from the concrete body
is known as “self curing concrete.”
9. Why self curing concrete?
• Some times works are carried out
in place where there is acute
shortage of water and the
application of water curing is not
possible for reasons of economy.
• prevention of moisture loss from
the surface of flat concrete works
such as highways and airports have
been challenging task for
construction managers.
10. (…cntd)
• If the evaporation of moisture
from concrete are not prevented
properly it may results in plastic
shrinkage cracks, poorly formed
hydrated products, finishing
problems and other surface
defects.
• Sometimes concrete is placed in
some inaccessible , difficult or far
places. Where curing cannot be
properly done or supervised.
11. How to find out the
rate of evaporation?
•Drying behavior of
concrete depends upon air
temperature, relative
humidity , concrete
temperature and wind
condition.
•Figure shows drying
behavior as per learch’s
investigation.
•(Based on ACI:305 R-5)
•
12. How the self curing is being done?
• Membrane forming curing compounds are used to
retard the loss of water from concrete during the early
age.
• They are used not only for curing fresh concrete but
also further curing after removal of formwork.
• Application of these compounds seals the concrete
surface effectively by forming monomolecular film on
the surface.
Membrane forming curing compounds is a long chain
of hydrocarbon molecules.
Which forms monomolecular film on the surface of
the concrete immediately after placing.
13. H H H
| | |
H-C-H H-C-H H-C-H
| | |
H-C-H H-C-H H-C-H
| | |
H-C-H H-C-H H-C-H
| | |
H-C-H H-C-H H-C-H
| | |
O O O
| | |
H H H
CURING
COMPOUND
WATER
CONC.
The compound molecules is
primarily hydrophobic in nature
with hydrophilic terminal group.
Hydrophilic terminal group
attaches it self to the film of
bleeding water.
While the long Hydrophobic
chain maintains a vertical
orientation away from the bleeding
water.
Water molecules do not possess
sufficient energy to escape through
the hydrophobic layer.
Which results into quick
reduction in the evaporation loss.
MECHANISM:
14. • The hydrophobic effect represents the
tendency of water to exclude non-polar
molecules. The effect originates from the
disruption of highly dynamic hydrogen
bonds between molecules of liquid.
• A hydrophilic molecule or portion of a
molecule is one that has a tendency to
interact with or be dissolved by water.
• A pure hydrocarbon molecule, is incapable
of forming hydrogen bonds with water.
• The hydrogen bonds are partially
reconstructed by building a water "cage"
around the compound molecule.
• The water molecules that form the "cage“
have substantially restricted mobilities.
16. TYPE OF COMPOUND DESCRIPTION
resin and wax based curing
compound
•They seals the concrete effectively.
• with the time their efficiency will get
reduced.
• if plastering is required to be done the
surface can be washed off with hot
water.
• it gives an average efficiency of about
80%.
17. TYPE OF COMPOUND DESCRIPTION
Acrylic based membrane
forming curing compound
• They seals the concrete effectively.
• additional advantage of having better
adhesion of subsequent plaster. It does
not need to be washed with hot water.
• better bonding for plaster.
Chlorinated rubber type
compound
• it does not only protect concrete from
drying out but also fill the minute pores
in the surface of concrete.
• the surface film will wear out
eventually.
18. APPLICATION PROCEDURE
• It is applied by brushing or by spraying while the concrete is
wet.
• In the case of beam and column the application is done after removal
of formwork
• In case of road and pavements the curing compound is applied after
texturing.
• in case the concrete surface has dried, the surface should be sprayed
with water and thoroughly wetted and made fully damp before curing
compound is applied.
• the container of curing compound should be well stirred before use.
19. Liquid membrane forming compound:
• Following types of compounds are included in it;
a) clear or translucent without dye
b) clear translucent with fugitive dye
c) White pigmented
• The main performance specification for curing
compounds:
ASTM C-309 Liquid Membrane – Forming Compounds for
Curing Concrete. The curing compound shall not allow the
concrete specimen to lose more than 0.55kg /m² of water in
72 hours
20. White-pigmented concrete curing compounds
• White-pigmented concrete curing compounds are
wax-based dispersions with selected white pigments.
• When properly applied, which optimizes water
retention. The white pigment reflects the sun's rays
and helps to keep the concrete surface cooler and
prevent excessive heat buildup.
• It is ideal for application on exterior, horizontal
surfaces, such as highways, airports pavements.
21. Advantages
• When properly applied, provides a premium-grade
film, which optimizes water retention.
• Protects by reflecting the sun's rays to keep the
concrete surface cooler and prevent excessive heat
buildup, which can cause thermal cracking.
• Furnished as a ready-to-use, true water-based
compound. Produces hard, dense concrete ...
minimizes hair checking, thermal cracking, dusting
and other defects.
• Offers a compressive strength significantly greater
than improperly or uncured concrete.
• Improves resistance to the abrasion and corrosive
actions of salts and chemicals ... minimizes shrinkage.
22. Application method
• Spray on in one even coat with a hand or power sprayer
as soon as the surface water disappears from concrete
surface.
Precautions
• Keep from freezing. Do not apply when the temperature
of the air and/or the concrete is less than 40º F (4º C).
• Do not mix or dilute with any other products or liquids.
• Do not use on surfaces that are later to be painted, tiled,
hardened, sealed or treated in any manner. Not
recommended for use on residential applications.
• It is applied in two coats. If needed more coat may be
applied.
23. Resin-Based, Water-Based Concrete Curing
Compound:
Uses
• Used on both interior and exterior applications where paint,
resilient tile or resilient flooring may be applied later.
• Because of the wide variety of coatings, paints, adhesives, and
toppings available, contact the manufacturer of the flooring
system for application approval over resin-based curing
compounds.
• A small test application is always recommended.
Technical data
• Drying time: typically dries in 1-2 hours, depending on jobsite
conditions (temperature, wind, etc.)
• Restrict foot traffic for at least four hours; 12 hours is preferable.
24. General Tips For Application Of Liquid- Membrane
Curing Compounds:
• Always apply the curing compound uniformly at the specified
application rate (typically 200 ft²/gallon, 4.9 m²/L).
• A major problem on most jobsites is the spraying of the curing
compounds at extremely high application rates, i.e., The
material is applied at 300-400 ft²/gallon, rather that 200
ft²/gallon. As a result, the quality of the concrete goes down
dramatically!
• A good rule of thumb on flatwork is to apply the curing
compound heavy enough to create a slight flood of material
on the concrete surface or, as another option, apply the
curing compound in two applications, one at right angles to
the other.
25. Conclusion
• In short, discussed all above curing compounds
are effective tool to avoid the occurrence of
plastic shrinkage cracks in a windy, low humid
and exposed to sun condition.
• Contractor can benefit by able to expedite the
work schedule and placing more concrete while
client benefits by obtaining concrete free of
plastic shrinkage crack and having greater
durability value.
26. • REFERANCES:
• ACI 308 R
• Text book of concrete technology by M.S.shetty
• article on evaporation reducer for pavement
concrete, NBM & CW, april 2007
• www.wikipedia.com
• www.google.com
• Web site of W. R. MEADOWS, 2002