This report details an experiment to determine the initial and final setting times of a hydraulic cement using the Vicat needle test method. The cement paste was prepared and tested according to ASTM standards. The initial setting time was found to be 2 hours and 45 minutes when the needle penetration was 6 mm. The final setting time was then calculated using an empirical equation to be 4 hours and 48 minutes. While only two penetration measurements were taken, the results indicate the cement would be suitable for construction uses and meet the Iraqi standard of a minimum 1 hour initial setting time.
This test method is used to determine the time of setting of the cement by VICAT
needle apparatus.
The knowledge of the setting time of the cement is always helpful in deciding the time duration
to mix, transport, place and compact the concrete effectively.
We always prefer a larger initial setting time so that we can mix, transport and place the
concrete easily. According to ASTM specifications, the initial setting time shall not be less
than 45 min but in the field we prefer an initial setting time not less than 90 min.
A smaller value of the final setting time is always preferred in order to avoid large expenditures
on the formwork. According to most of the specifications, the final setting time shall not be
greater than 10hrs and shall not be less than (90 + 1.2 x (initial setting time)) min.
This test method is used to determine the time of setting of the cement by VICAT
needle apparatus.
The knowledge of the setting time of the cement is always helpful in deciding the time duration
to mix, transport, place and compact the concrete effectively.
We always prefer a larger initial setting time so that we can mix, transport and place the
concrete easily. According to ASTM specifications, the initial setting time shall not be less
than 45 min but in the field we prefer an initial setting time not less than 90 min.
A smaller value of the final setting time is always preferred in order to avoid large expenditures
on the formwork. According to most of the specifications, the final setting time shall not be
greater than 10hrs and shall not be less than (90 + 1.2 x (initial setting time)) min.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Astm designation c 136 for fine aggregatesMuhammad Ahmad
Sieve Analysis for Fine Aggregate as per ASTM. Slides contain all the relevant data and steps that would be required for the performance of sieve analysis of fine aggregates.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Astm designation c 136 for fine aggregatesMuhammad Ahmad
Sieve Analysis for Fine Aggregate as per ASTM. Slides contain all the relevant data and steps that would be required for the performance of sieve analysis of fine aggregates.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
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.
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/
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
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
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.
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.
Cosmetic shop management system project report.pdf
Setting Time of Hydraulic Cement By Vicat Needle | Jameel Academy
1. University of Duhok
College of Engineering
Civil Department
Concrete Technology – Practical
Concrete Laboratory
A Report About :
Time of Setting of Hydraulic Cement by
Vicat Needle
Submitted By : Jameel Masoud Jameel
Lab. No. : 2
Group Name : B1
Testing Date : 29 / 10 / 2017
Submitting Date : 5 / 11 / 2017
Supervised By : Youkhanna
2017 – 2018
2. References :
1) ASTM C191-04
2) ASTM C305-99
Introduction :
Initial setting time is that time period between the time water is added to
cement and time at which 1 mm square section needle fails to penetrate the
cement paste, placed in the Vicat’s mould 5 mm to 7 mm from the bottom
of the mould. and Final setting time is that time period between the time
water is added to cement and the time at which 1 mm needle makes an
impression on the paste in the mould but 5 mm attachment does not make
any impression. This test is carried out to find whether a cement sets at a
rate suitable for a particular work.
3. Purpose :
This test method provides a means of determining compliance with a
specification limit for Vicat time of setting.
Materials :
1) Potable water.
2) Ordinary Portland cement (OPC).
Equipment :
1) Sensitive balance .
2) Graduate cylinder .
3) Vicat apparatus (with a plunger of 300gm as a total weight and a
needle of 1 mm dia.) .
4) Vicat mold .
5) Mechanical Mixer.
6) Trowel .
7) Glass plate .
8) Stop Watch,
9) Hand covers (plastic gloves) .
4. Sketches :
Mixer Sensitive balance
Graduate Cylinder Vicat Apparatus and Vicat mold
G and Glass Plate
`
hand Cover Trowel Stop Watch
(Plastic Gloves)
5. Procedures :
1) Prepare a new batch of paste by mixing 650 g of cement with the percentage of
mixing water required for normal consistency (from results of test#1).
2) Mixing is done using a mechanical mixer, and the procedure described in ASTM
C305 are followed as follows:
3) Place the dry paddle and the dry bowl in the mixing position in the mixer. Then
introduce the materials for a batch into the bowl and mix in the following
manner:
a) Place all the mixing water in the bowl.
b) Add the cement to the water and allow 30 seconds for the absorption of
the water.
c) Start the mixer and mix at slow speed for 30 seconds.
d) Stop the mixer for 15 seconds and during this time scrape down into the
batch any paste that may have collected on the side of the bowl.
e) Start the mixer at medium speed and mix for 60 seconds.
4) At the completion of the mixing cycle, the paste shall be removed from the bowl
and pressed into the large end of the Vicat mold. The excess paste at the large
end shall be struck off with trowel, then place the large end down on a glass
plate.
5) The excess paste at the small end shall be struck off with a single stroke of the
trowel. During these operations of cutting and smoothing, take care not to
compress the paste.
6) Immediately after molding, place the test specimen in the moist closet or moist
room and allow it to remain there except when penetration measurements are
being made.
7) Allow the time of setting specimen to remain in the moist cabinet for 30 minutes
after molding without being disturbed.
6. 8) Determine the penetration of the 1-mm needle at this time and every 15 minutes
thereafter (every 10 minutes for Type III cements) until a penetration of (34-36)
mm or less is obtained.
9) Perform the penetration test by lowering the needle, of the rod until it rests on
the surface of the cement paste. Tighten the set screw, and set the indicator at the
upper end of the scale, or take an initial reading. Release the rod quickly by
releasing the set screw and allow the needle to settle for 30 seconds; then take
the reading to determine the penetration.
10) Make each penetration test at least 5 mm away from any previous penetration
and at least 10 mm away from the inner side of the mold.
11) Record the results of all penetration tests and, by interpolation, determine the
time when a penetration of 35 mm is obtained. The elapsed time between the
initial contact of cement and water and the penetration of (34-36) mm is the
Vicat time of setting or Vicat initial time of setting.
12) Determine the Vicat final time of setting end point to be the first penetration
measure that does not mark the specimen surface with a complete circular
impression. Verify final set by performing two additional penetration
measurements on different areas of the specimen surface. Obtain verification
measurements within 90 s of the first “final set” measurement. The elapsed time
between the initial contact of cement and water and the end point determination
above is the Vicat final time of setting.
13) An alternative method can be used to determine the final setting time using the
empirical equation and as follows:
Final setting time = 1.2 × (initial setting time) + 90
Where: initial and final setting times are in minutes.
7. Calculations and Results :
We can determine the initial setting time by using this formula :
Initial Setting time = Last time – First time
Where :
First time = Time at which water is first added to cement.
Last time = Time when needle fails to penetrate 5 mm to 7 mm
from bottom of the mould.
And final setting time can be calculated by using this formula :
Final setting time = 1.2 × (Initial setting time) + 90
Where : initial and final setting time in minutes.
The detail's Table is :
Initial Setting time determined as :
Initial Setting time = 1:00 PM – 10:15 AM = 2 hr and 45 min
Final Setting time determined as :
2 hr and 45 min = 165 min
Final setting time = 1.2 × (165 min) + 90 = 288 min = 4 hr and 48 min
Note :
in this test we just measure the penetration, first time when the time is (10:15 AM)
at penetration (0 mm), and second time when the time is (1:00 PM ) penetration
is (6 mm) and the setting time that we choose is at penetration (6 mm) that time
is (2 hr and 45 min).
Time Penetration
10:15 AM 0 mm
1:00 PM 6 mm
8. Discussion and Conclusion :
In this test we determine the Initial and Final setting time for a sample
amount of Cement Paste, and finally we will get a result after doing all
procedure accurate which is two different penetrations in (mm), our
result are two penetration with different period time, when penetration is
(0 mm) at (10:15 AM) and when it is (6 mm) at (1:00 PM) and this result
show us the setting time which is ( 2 hr and 45 min) that we know by the
differences between two penetration's period time, in this test we just
measure two penetration which is (0 mm) and (6 mm ) it will be better
and accuracy if we measure some different penetration at another time
but we don’t have enough time to measure more penetration in
laboratory, if we have some errors in initial setting time then in final
setting time we will have some errors too, because we measure the final
setting time by using empirical equation which is related to initial setting
time, this result show us that our cement paste can be used in
construction without facing any problems when we work with it, if we
compare our result with Iraqi standard which is said " the initial siting
time doesn’t be less than ( 1 hour )" as show in our result which is greater
than the standard and it will be acceptable for using it, in this test we
have some errors one of them is we just use two penetration in
calculation and measure it, and another one is we didn’t measure
penetration after 30 second when the needle go down through the cement
paste in (Vicat mold) according to Iraqi Standard , we know that if we
do many tests of another amount of cement paste then the result will be
very accuracy.
In conclusion the purpose of this test is to determine the initial and final
setting time and compare the result with standard. then we measure the
penetration and get a best initial and final setting time of cement paste
and finally in this test we will know when the cement become hardened
or be able to resist whether condition in construction work.