1.5. Equipment

Today, we're learning about the equipment needed for the compressive strength test of concrete. Can anyone tell me what the main machine used is?

I think it’s a Compression Testing Machine?

That's right! The Compression Testing Machine, or CTM, is essential for this test. It's used to apply load until the concrete fails. What other equipment do we need?

We need curing tanks for the specimens, right?

Exactly! Curing tanks keep the specimens hydrated. Another tool is the tamping rod used for compacting the concrete during casting. Remember: CTM, curing tank, and tamping rod—let’s use the acronym CCT as a memory aid.

What about dimensions for the specimens?

Good question! The standard dimensions for the compressive strength test are cubes measuring 150 mm on each side or cylinders with a diameter of 150 mm and a height of 300 mm.

Got it! So we need to remember CCT and the specimen sizes.

Exactly! Understanding these tools and dimensions is critical for accurate result measurements.

Now, let’s discuss the Flexural Strength Test. What type of equipment do we require for this particular test?

Do we use a modified CTM for it?

Correct! We use a Flexural Testing Machine which can either be a modified CTM or a dedicated flexural apparatus. What about the test setup?

We need support rollers?

Yes! Both steel support rollers and loading rollers are required. Let’s remember these components with the mnemonic 'FS-Roll', standing for Flexural Strength-Rollers.

And what about the beam sizes?

The beams can be sized either 100 mm × 100 mm × 500 mm or 150 mm × 150 mm × 700 mm. It's essential to get these sizes right for reliable outcomes.

Switching gears, let’s dive into the equipment required for the split cylinder test to measure tensile strength. What do we use?

We need a CTM with horizontal loading platens, right?

That's correct! The CTM is equipped with horizontal loading platens. What else helps distribute the load?

Thin plywood strips?

Exactly! The plywood strips protect the specimen and evenly spread the load during testing. To remember this, let’s use the acronym 'CTP' for Cylinder Test Plywood.

What are the dimensions for the cylindrical specimen?

The dimensions for the cylindrical specimen are 150 mm in diameter and 300 mm in height. Keeping track of these details is vital in obtaining accurate tensile strength results.

Lastly, let’s review the equipment needed for the bond strength test, which evaluates the connection between concrete and reinforcement. What do we need here?

We use a Universal Testing Machine!

Correct! The Universal Testing Machine applies the tensile force on the embedded steel bar. What’s another essential tool for measuring?

A dial gauge or extensometer?

Yes! Both instruments help measure the slip during the test. To aid recall, let’s remember the phrase 'UB-Measure' for Universal Bond Measurement.

And the specimen?

Great note! We'll typically use a cubic or cylindrical specimen with a 12 mm diameter steel bar, usually set to an embedment length of 100-150 mm.