CIVE1265 Concrete lab Part 2
Summary
TLDRThe video script details a comprehensive guide on concrete testing, focusing on compressive, split intensity, and flexural testing. It explains the standard sample sizes for different standards, such as Australian and U.S. standards favoring 200mm x 100mm cylinders, while UK and European standards prefer 100mm or 150mm cubes. The script also describes the use of an MTS machine for testing, the setup for split intensity testing with a special frame, and the four-point bending test arrangement. The video provides a practical demonstration of these tests, enhancing understanding of concrete strength evaluation.
Takeaways
- 🗓️ The script describes a process of testing concrete specimens after a curing period of seven days.
- 🏗️ Three types of concrete tests are mentioned: compressive testing, split intensity testing, and flexural (bending) testing.
- 📏 Compressive testing can be conducted on two different sample sizes: 200mm height by 100mm diameter cylinders or cubes of 100mm or 150mm.
- 🌐 There are regional differences in standard sample sizes, with Australia and the U.S. favoring cylinders and the UK and Europe favoring cubes.
- 📊 Compressive strength readings can vary depending on whether cylinders or cubes are used, so it's important to specify the specimen type when presenting results.
- 🔩 The script introduces a larger cylinder with 300mm height and 150mm diameter, which is used for split intensity testing.
- 🔄 Split intensity testing involves applying a horizontal compression load that converts into an axial tensile force, causing the cylinder to split.
- 🛠️ The script mentions the use of an MTS machine for testing, capable of applying up to 3000 Newtons of force, with the possibility of upgrading for higher loads.
- 🔧 A special frame is required for split intensity testing, which is different from the standard compressive testing setup.
- 🔄 The script also discusses four-point bending testing, which requires a specific framework with two points of loading and two roller supports.
Q & A
What types of concrete testing are mentioned in the script?
-The script mentions three types of concrete testing: compressive testing, split intensity testing, and flexural or bending testing.
What are the standard sample sizes for compressive testing according to the script?
-The standard sample sizes for compressive testing mentioned are 200 millimeter height and 100 millimeter diameter cylinders, and 100 or 150 millimeter cubes.
Why might there be different compressive strength values for cylinders and cubes?
-Different compressive strength values for cylinders and cubes may be due to the different shapes and sizes of the samples, which can affect the stress distribution during testing.
What is the purpose of the larger cylinder with 300 millimeter height and 150 millimeter diameter?
-The larger cylinder with 300 millimeter height and 150 millimeter diameter is used for split intensity testing, which measures the tensile strength of the concrete indirectly.
How does the split intensity testing frame work?
-The split intensity testing frame applies a horizontal compression load to the cylinder, which is then converted into an axial tensile force, causing the cylinder to split into two parts.
What is the role of timber bits in the split intensity test?
-Timber bits are placed on either side of the cylinder in the split intensity test frame to ensure proper alignment and to prevent the cylinder from moving during the test.
What is the four-point bending test and how is it set up?
-The four-point bending test is a flexural test that measures the bending strength of a specimen. It is set up with two points of load application and two roller supports, creating a setup with two spans.
What is the maximum force the MTS machine used in the script can apply?
-The MTS machine used in the script can apply a maximum force of 3000 Newtons, with the possibility of upgrading for higher forces if required.
How does the compressive strength test work on the MTS machine?
-In the compressive strength test on the MTS machine, a constant pressure is applied to the top surface of the cylinder by the movable arm until the cylinder is crushed.
What is the significance of presenting the type of specimen (cylinder or cube) when reporting compressive strength?
-Presenting the type of specimen (cylinder or cube) when reporting compressive strength is significant because it provides context for the results, as different specimen shapes can yield different strength values.
Outlines
🏗️ Concrete Testing Procedures
This paragraph discusses the various tests conducted on concrete specimens after a week of curing. The narrator explains three types of tests: compressive testing, split intensity testing, and flexural (bending) testing. The standard sample sizes for compressive testing are highlighted, which include 200mm height and 100mm diameter cylinders following Australian or U.S. standards, and 100mm or 150mm cubes following UK or European standards. The importance of specifying the specimen type when reporting compressive strength is emphasized. The paragraph also introduces larger cylinders of 300mm height and 150mm diameter for split intensity testing and mentions the use of a different frame for applying horizontal compression load. The narrator promises to explain more about split intensity testing during the actual demonstration. Additionally, a four-point bending test setup is mentioned, which will be elaborated upon later.
🔧 Setting Up for Split and Flexural Testing
The second paragraph focuses on the preparation for split and flexural (bending) tests. The narrator describes the process of placing a cylinder into a special frame for the split intensity test, which involves using two timber bits for support. The arrangement is designed to apply a compression force vertically to the cylinder, which then translates into a horizontal or lateral direction, converting into axial tensile force as per equations provided in a handout. The narrator demonstrates how the cylinder splits into two parts, hence the name 'split intensity' or 'indirect tensile' test. The paragraph concludes with a brief introduction to the setup for the four-point bending test, which includes a framework with two points of loading and two roller supports, essential for conducting the flexural test.
Mindmap
Keywords
💡Concrete Casting
💡Compressive Testing
💡Split Intensity Testing
💡Flexural Testing
💡Cylinders and Cubes
💡Australian Standards
💡UK Standards
💡MTS Machine
💡Load Cell
💡Four-Point Bending Test
Highlights
Introduction to concrete casting and testing after a seven-day cure.
Three types of concrete testing: compressive, split intensity, and flexural (bending).
Standard sample sizes for compressive testing include 200mm height and 100mm diameter cylinders.
Different standards for sample sizes: Australian/U.S. standards prefer cylinders, while UK/European standards prefer cubes.
Compressive strength readings vary depending on whether cylinders or cubes are tested.
Larger cylinders of 300mm height and 150mm diameter are used for split intensity testing.
Split intensity testing involves a special frame to apply horizontal compression load.
Flexural testing, also known as bending testing, uses a four-point bending test setup.
Explanation of the MTS machine used for testing concrete specimens with a maximum capacity of 3000 Newton.
Demonstration of compressive strength testing on a cylinder using the MTS machine.
Split intensity testing setup with a special frame and the use of timber bits.
Conversion of lateral compression force into axial tensile force during split testing.
Observation of the cylinder splitting into two parts during split intensity testing.
Setup for four-point bending test with two pin supports and one roller support.
Overview of the testing process and the importance of presenting accurate test specimen information.
Transcripts
hi good morning everyone so
we have a concrete casting last week now
uh after seven days cured specimens we
going to test so basically we have to do
3 concrete testing compressive testing
split intensity testing and flexural or
bending testing so this is the standard
sample size for the compressive testing
we have two different size of samples we
can select for uh compression so one is
cylinder this is a 200 millimeter height
and 100 millimeter
diameter cylinders so this is basically
australian standards or u.s standards
generally follows concrete cylinders for
the compressive strength but when we
consider uh
uk standards and european standard they
are more towards the cubes so it can be
100
millimeter cubes or 150 millimeter cubes
so instead of this concrete cylinders so
two different values you will get for
the compressive strength when you say uh
when you are testing for the cylinders
or else cube so make sure you need to
present your
compressive strength reading what
specimens you have tested either
cylinders or cubes
the next one is the larger cylinder so
this one three millimeter 300 millimeter
height
150 millimeter diameter so this
uh
we can use for the split intensity
testing so i will explain more on the
split intensity testing while we are
doing the things so we have a different
frame then we have to uh provide
horizontal load horizontal compression
load that will be transferred to the
axial of direction and convert into the
axial tensile force
the other one is
flexural
testing so in other words we are saying
bend in testing so we are this is a four
point bending test so this is also have
a separate arrangement frame so i will
make sure to explain bit more during the
testing stage
thank you
so
[Applause]
okay so
this is the mts machine so we're going
to use that testing machine
to test all the concrete specimens today
so which can go up to maximum three
thousand uh three thousand newton so we
can also upgrade into the further couple
of thousands if required so
then this is a compressive strength uh
cylinder so we are compressing in
both directions so
this arm can be this is a fixed arm this
is the movable arm the lower cell so it
will apply constant pressure to your
cylinder the top surface so until being
crushed
first one
hey
so
[Music]
so this is the
split in testing we're going to do this
is the special frame so we required for
this particular testing
so
now we need to place the cylinder into
the frame
so before that we need
two timber bits
we have to keep
one in here
the other
on the top
okay this is the
uh specific arrangement for the split
intensive taste
[Music]
okay this is the pool arrangement
so we are providing compression force
here again so with the upper load cell
so you can see when you do the testing
when we do the testing
then you will come you will provide the
compression force to the cylinder in
vertically it will transfer to this
middle axis
to the horizontal direction or the
lateral direction so then it will
convert then equations provided in this
handout
can convert that
lateral compression force into the axial
tensile force
so
so
can you see they exactly split into the
two parts so that's why we are telling
this taste as a split intensive
sometimes we call indirect tensile taste
these are the two split parts
okay this is the going to test uh
bending or the flexural testing this is
the framework we required so we have
four point bending testing this is two
points and we'll provide two roll uh one
pin support and one roller supports so
that's the arrangement for four point
bending test
so
[Music]
you
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