This document provides information on various tests conducted on aggregates that are used in construction. It describes the aggregate abrasion value test, which determines the abrasion resistance and hardness of aggregates. It also summarizes the aggregate impact value test, which evaluates the resistance of aggregates to shocks and impacts, and the aggregate crushing value test, which determines the resistance of aggregates to crushing under gradually applied compressive loads. Finally, it outlines the procedure to determine the specific gravity and water absorption of aggregates.
MEANING OF MIX DESIGN
GRADE OF CONCRETE.
FACTORS INFLUCING THE CHOICE OF MIX DESIGN.
MATHODS OF CONCRETE MIX DESIGN
MIX DESIGN BY INDIAN STANDARD METHOD.
MEANING OF MIX DESIGN
GRADE OF CONCRETE.
FACTORS INFLUCING THE CHOICE OF MIX DESIGN.
MATHODS OF CONCRETE MIX DESIGN
MIX DESIGN BY INDIAN STANDARD METHOD.
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Introduction to pavement materials. Different types of materials used in the construction of roads and highways. Learn what are different types of materials and what are requirements of materials used in the pavement construction.
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Introduction to pavement materials. Different types of materials used in the construction of roads and highways. Learn what are different types of materials and what are requirements of materials used in the pavement construction.
A summer training presentation on Highway material and soil testing.
In this presentation along with the entire test procedure readings and images of apparatus are used for better understanding.
The experiments are presented in a creative manner.
Apparatus for Aggregate Impact Test
The apparatus as per IS 2386 (Part IV) - 1963 consists of
(i) A testing machine weighing 45 to 60 kg and having a metal base with a painted lower surface of not less than 30 cm in diameter. It is supported on a level and plane concrete floor of a minimum 45 cm thickness. The machine should also have provisions for fixing its base.
(ii) A cylindrical steel cup of internal diameter 102 mm, depth 50 mm and minimum thickness 6.3 mm.
(iii) A metal hammer or tup weighing 13.5 to 14.0 kg the lower end being cylindrical in shape, 50 mm long, 100.0 mm in diameter, with a 2 mm chamfer at the lower edge and case hardened. The hammer should slide freely between vertical guides and be concentric with the cup. Free fall of the hammer should be within 380±5 mm.
(iv) A cylindrical metal measure having an internal diameter of 75 mm and depth of 50 mm for measuring aggregates.
(v) Tamping rod 10 mm in diameter and 230 mm long, rounded at one end.
(vi) A balance of capacity not less than 500g, readable and accurate up to 0.1 g.
The property of a material to resist impact is known as toughness. Due to movement of vehicles on the road the aggregates are subjected to impact resulting in their breaking down into smaller pieces. The aggregates should therefore have sufficient toughness to resist their disintegration due to impact. This characteristic is measured by the impact value test. The aggregate impact value is a measure of resistance to sudden impact or shock, which may differ from its resistance to gradually applied compressive load.
Procedure of Aggregate Impact Test
The test sample consists of aggregates sized 10.0 mm 12.5 mm. Aggregates may be dried by heating at 100-110° C for a period of 4 hours and cooled. (i) Sieve the material through 12.5 mm and 10.0mm IS sieves. The aggregates passing through 12.5mm sieve and retained on 10.0mm sieve comprises the test material. (ii) Pour the aggregates to fill about just 1/3 rd depth of measuring cylinder. (iii) Compact the material by giving 25 gentle blows with the rounded end of the tamping rod. (iv) Add two more layers in similar manner, so that cylinder is full. (v) Strike off the surplus aggregates. (vi) Determine the net weight of the aggregates to the nearest gram(W). (vii) Bring the impact machine to rest without wedging or packing up on the level plate, block or floor, so that it is rigid and the hammer guide columns are vertical. (viii) Fix the cup firmly in position on the base of machine and place whole of the test sample in it and compact by giving 25 gentle strokes with tamping rod. (ix) Raise the hammer until its lower face is 380 mm above the surface of aggregate sample in the cup and allow it to fall freely on the aggregate sample. Give 15 such blows at an interval of not less than one second between successive falls. (x) Remove the crushed aggregate from the cup and sieve it through 2.36 mm IS sieves until no further significant amount passes in one minute.
Los Angeles Abrasion Test
To determine the Los Angeles abrasion value.
To find the suitability of aggregates for use in road construction. Select the most suitable aggregate for different kinds of works based on the abrasion value. The test is significant to determine the hardness (and toughness) of the material.
The difference between the original and final weights of the sample represents the actual wear. This value is expressed as a percentage of the original weight of the sample and is reported as the percentage of wear.
DETERMINATION OF UNCONFINED COMPRESSIVE STRENGTH OF SOILJaptyesh Singh
DETERMINATION OF UNCONFINED COMPRESSIVE STRENGTH OF SOIL in Foundation Engineering
INTRODUCTION
TERMINOLOGY
APPARATUS
SOIL SPECIMEN & ITS TYPES
THEORY
RELEVANCE OF THE EXPERIMENT
PROCEDURE
VIDEO
OBSERVATION
DISCUSSION
REMARKS
Flow in super critical state is an unstable type of flow. It has a tendency to transfer n to sub critical flow. Flow depth is small in a supercritical state. which increases suddenly while changing the subcritical state. This phenomenon sudden increase in depth of flow is called a HYDRAULIC JUMP.
The derivation of the equation of motion for various fluids is similar to the d derivation of Eular’s equation. However ,the tangential stresses arise during the motion of a real viscous fluid, must be considered
A sluice is a water channel that is controlled at its head by a gate (from the dutch word “sluis” ). For example, a millrace is a sluice that channels water towards a water mill. The terms “sluice gate” , "knife gate", and "slide gate" are used interchangeably in the water/wastewater control industry.
During its forward movement, the blade cuts the ground and the loosened earth collected in the body of scraper. When the scraper is fully loaded, it is raised above ground d taken to the site of dumping. The earth from the scarper is than taken out by opening the bottom of it and the earth is laid in layer of required thickness.
Pump is a mechanical device to increase the pressure energy of fluid. The pumps are used as water – handling device in construction projects. The water is required to handle for human consumption, drainage and dewatering. The liquid handled by the pumps may be water, oil, milk, sludge etc.
AN IMPLOSION IS AN EENT WHERE SOMETHING COLLAPS INWARD, BECAUSE THE EXTERNAL ATMOSPHERIC PRESSURE IS GREATER THAN THE INTERVAL PRESSURE. FOR EXAMPLE, IF YOU PUMPED THE AIR OUT OF A GLASS TUBE, IT MIGHT IMPLODE.
The hoisting is the lifting of the material against gravity and maybe done with a wide range of equipments from the small hand operated simple screw or hydraulic-jack to modern high powered cranes and elevators.
Stiffness method of structural analysisKaran Patel
This method is a powerful tool for analyzing indeterminate structures. One of its advantages over the flexibility method is that it is conducive to computer programming.
Stiffness method the unknowns are the joint displacements in the structure, which are automatically specified.
When rainwater falls on the ground, a small part of it is initially absorbed by the top thin layer of soil so as to replenish the soil moisture deficiency.
A building is provided with a drainage system to discharge effectively the sewage of the building into the public sewer. Domestic sewage from a building includes human excreta as well as discharge from the bathroom, kitchen, etc. and collected by building sewers and finally discharged into the public sewer.
Disasters natural or man-made can destroy lives and properties on a very large scale, often pushing nation, in the quest for progress, back by several decades, thus, efficient management of disasters, rather than more response to their occurrence has received increased attention in the country.
IMAGE INTERPRETATION TECHNIQUES of surveyKaran Patel
Image interpretation is the process of examining an aerial photo or digital remote sensing image and manually identifying the features in that image. This method can be highly reliable and a wide variety of features can be identified, such as riparian vegetation type and condition, and anthropogenic features
In engineering, deflection is the degree to which a structural element is displaced under a load. It may refer to an angle or a distance.
The deflection distance of a member under a load is directly related to the slope of the deflected shape of the member under that load, and can be calculated by integrating the function that mathematically describes the slope of the member under that load. Deflection can be calculated by standard formula (will only give the deflection of common beam configurations and load cases at discrete locations), or by methods such as virtual work, direct integration, Castigliano's method, Macaulay's method or the direct stiffness method, amongst others. The deflection of beam elements is usually calculated on the basis of the Euler–Bernoulli beam equation while that of a plate or shell element is calculated using plate or shell theory.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
3. AGGREGATE ABRASION VALUE
AIM :- To determine the abrasion value and
hardness property of aggregates as per IS: 2386
(Part IV) - 1963.
APPARATUS :-
1) Los Angles abrasion testing machine
2) IS Sieve of size - 1.7mm
3) Abrasive charge - 12 nos. cast iron or steel spheres
approximately 48mm dia. and each weighing
between 390 and 445g ensuring that the total
weight of charge is 5000 + 25g
4) Oven
4. PURPOSE :- Due to the movements of traffic, the road
stones used in the surfacing course are subjected to
wearing actions at the top. When traffic moves on the road
the soil particle (sand) which comes between the wheel
and road stone. Abrasion test are carried out to test the
hardness property of stones and to decide whether they are
suitable for the different road structure.
PREPARATION OF SAMPLE :- The test sample
should consist of clean aggregates which has been dried in
an oven at 105 to 110oC to a substantially constant weight
and should conform to one of the grading shown in the
table below:
5. Sieve size Weight in g of test sample for grade
A B C D E F G
Passing
through
(mm)
Retained on
(mm)
80 63 - - - - 2500 - -
63 50 - - - - 2500 - -
50 40 - - - - 5000 5000 -
40 25 1250 - - - - 5000 5000
25 20 1250 - - - - - 5000
20 12.5 1250 2500 - - - - -
12.5 10 1250 2500 - - - - -
10 6.3 - - 2500 - - - -
6.3 4.75 - - 2500 - - - -
4.75 2.63 - - - 5000 - - -
6. PROCEDURE :-
clean and dry aggregate sample confirming to one of the grading A to G is used for the test.
Aggregates weighing 5kg for grading A, B, C or D and 10kg for grading E, F or G may be takes
as test specimen and placed in the cylinder.
The abrasive charge is also chosen in accordance with table no.1 and placed in the cylinder of
the machine, and cover is fixed to make dust tight.
The machine is rotated at a speed of 30 to 33 revolutions per minute.
The machine is rotated for 500 revolutions for grading A, B, C and D, for grading E, F and G, it
shall be rotated for 1000 revolution.
After the desired number of revolution the machine is stopped and the material is discharged
from the machine taking care to take out entire stone dust.
Using a sieve of size larger than 1.70mm IS sieve, the material is first separated into two parts
and the finer position is taken out and sieved further on a 1.7mm IS sieve.
let the original weight of aggregate be w1 gm, weight of aggregate retained on 1.7mm IS sieve
after the test be w2 gm.
7. AGGREGATE IMPACT VALUE
AIM :- To determine the aggregate impact value of
coarse aggregates as per IS: 2386 (Part IV) - 1963.
APPARATUS :-
1) Impact testing machine conforming to IS: 2386
(Part IV)- 1963
2) IS Sieves of sizes - 12.5mm, 10mm and 2.36mm
3) A cylindrical metal measure of 75mm dia. and
50mm depth
4) A tamping rod of 10mm circular cross section and
230mm length, rounded at one end
5) Oven
8. PREPARATION OF SAMPLE
The test sample should conform to the following grading:
- Passing through 12.5mm IS Sieve 100%
- Retention on 10mm IS Sieve 100%
The sample should be oven-dried for 4hrs. at a temperature of 100 to 110oC and cooled.
The measure should be about one-third full with the prepared aggregates and tamped with
25 strokes of the tamping rod. A further similar quantity of aggregates should be added and
a further tamping of 25 strokes given. The measure should finally be filled to overflow,
tamped 25 times and the surplus aggregates struck off, using a tamping rod as a straight
edge. The net weight of the aggregates in the measure should be determined to the nearest
gram (Weight 'A').
9. PROCEDURE
The cup of the impact testing machine should be fixed firmly in position on the base of the
machine and the whole of the test sample placed in it and compacted by 25 strokes of the
tamping rod.
The hammer should be raised to 380mm above the upper surface of the aggregates in the cup
and allowed to fall freely onto the aggregates. The test sample should be subjected to a total of
15 such blows, each being delivered at an interval of not less than one second.
10. REPORTING OF RESULTS
The sample should be removed and sieved through a 2.36mm IS Sieve. The fraction passing
through should be weighed (Weight 'B'). The fraction retained on the sieve should also be
weighed (Weight 'C') and if the total weight (B+C) is less than the initial weight (A) by more than
one gram, the result should be discarded and a fresh test done.
The ratio of the weight of the fines formed to the total sample weight should be expressed as a
percentage.
Aggregate impact value =
B
A
x 100%
Two such tests should be carried out and the mean of the results should be reported.
11. AGGREGATE CRUSHING VALUE
AIM :- To determine the aggregate
crushing value of coarse aggregates as per
IS: 2386 (Part IV) - 1963.
APPARATUS :-
1) Cylindrical measure and plunger
2) Compression testing machine
3) IS Sieves of sizes - 12.5mm, 10mm and
2.36mm
12. PROCEDURE :-
1) The aggregates passing through 12.5mm and retained on 10mm IS
Sieve are oven-dried at a temperature of 100 to 110 C0 for 3 to 4hrs.
2) The cylinder of the apparatus is filled in 3 layers, each layer tamped
with 25 strokes of a tamping rod.
3) The weight of aggregates is measured (Weight 'A').
4) The surface of the aggregates is then levelled and the plunger inserted.
The apparatus is then placed in the compression testing machine and
loaded at a uniform rate so as to achieve 40t load in 10 minutes. After
this, the load is released.
5) The sample is then sieved through a 2.36mm IS Sieve and the fraction
passing through the sieve is weighed (Weight 'B').
6) Two tests should be conducted.
13. REPORTING OF RESULTS :-
Aggregate crushing value =
B
A
x 100%
14. SPACIFIC GRAVITY TEST
AIM :- To Determine Specific Gravity and water
absorption of aggregate.
PURPOSE :- The specific gravity of an aggregate is
considered to be a measure of strength or quality of
the material. Stones having low specific gravity are
generally weaker than those with higher specific
gravity value. The specific gravity test helps in
identification of stone. Water absorption gives an idea
of strength of rock. Stones having more water
absorption are porous in nature and are generally
considered unsuitable unless they are found to b
acceptable based on strength, impact and hardness
testes.
15. PROCEDURE :-
About 2kg of the coarse aggregate sample is washed thoroughly to remove fines, drained and
then placed in the wire basket and immersed in distilled water at a temp between 22° and 32°C
and covered of at least 5cm of water about the top of the basket.
Immediately after immersion the entrapped air is removed from the sample by lifting the basket
25 mm above the base of the tank and allowing it to drop 25 times at the rate of above one drop
per second the basket and aggregate should remain completely immersed in water for a period of
24+1/2 and 24-1/2 hrs afterwards.
The basket and the sample are then weighed well suspended in water at a temp of 22° and 32°C
in case it is necessary to transfer the basket and the sample to a different tank for weighing, they
should be jolted 25 times a described above in the new tank to remove air before weighing.
The weight is noted while suspended in water = 𝑤1 gm.
16. The basket and the aggregate are then remove from water and allowed to drain for a few
minutes, after which the aggregate are transferred to one of the dry absorbent clothes. The
basket is then return to the tank of water, jolted 25 times and weighed in water = 𝑤2 gm.
The aggregate then placed to direct sunlight or any other source of heat while surface drying.
The drying of aggregate must be done naturally. The surface dried aggregate is then weighed =
𝑤3 gm.
The aggregate is placed in tray and kept tray in an oven at a temperature of 110°C for 24 hrs.
and then weighed it = 𝑤4 gm.
17. sr.
no Details
Test number
1 2 Mean
value
1 Weight of saturated aggregate and basket in water = 𝑤1 gm
2 Weight of basket in water = 𝑤2 gm
3 Weight of saturated surface dry aggregate in natural air = 𝑤3
gm
4 Weight of oven dried aggregates = 𝑤4 gm
5 Specific gravity =
dry weight of aggregate
weight of equal volume of water
=
𝑤4
𝑤3 −(𝑤1−𝑤2)
6 Apparent Specific gravity =
dry weight of aggregate
weight of equal volume of water
=
𝑤4
𝑤4 − (𝑤1−𝑤2)
7 Water absorption =
(𝑤3−𝑤4)
𝑤4
* 100%