14. Uji Daktilitas

Summary

This video demonstrates a practical experiment involving bitumen materials. The process begins with preparing a mold and applying glycerin to it, ensuring the bitumen adheres only at the ends. The material is then carefully poured and allowed to set for an hour. The next stage involves testing the sample with a specific procedure that includes precise measurements and conditions, ensuring the bitumen sample maintains integrity under stress. The test measures how well the material holds up to a pulling force, providing insights into its durability and performance in real-world applications.

Takeaways

• 😀 The practical session involves activities with bitumen materials, focusing on creating a sample with molds.
• 😀 The mold is first unlocked, and glycerin is applied to all parts except the two ends to ensure the bitumen adheres only to those parts.
• 😀 The mold is carefully closed after the glycerin is applied, and then the bitumen is poured into the mold.
• 😀 The bitumen is poured in a single continuous stream to ensure it fills the mold evenly.
• 😀 After pouring, the sample is left to set for one hour before testing can begin.
• 😀 The testing process involves two testing devices, although only one is used in this particular session.
• 😀 The testing liquid consists of water mixed with glycerin to match the viscosity of bitumen for testing purposes.
• 😀 The sample is then tested by attaching it to the testing machine and performing a pulling test.
• 😀 The test requires the sample to be pulled at a speed of 5 cm per minute to a length of 100 cm without breaking.
• 😀 The results of the test determine whether the sample meets the required standards, depending on whether it breaks before reaching 100 cm.
• 😀 The practical session concludes once the test is complete, and the success of the sample is determined based on the criteria.

Q & A

What is the first step in preparing the mold for bitumen testing?

The first step involves unlocking the mold and applying glycerin to all parts of it except for the two ends. The ends are left untreated to ensure the bitumen will stick to them.

Why is glycerin applied to the mold during the preparation process?

Glycerin is applied to the mold to ensure that the bitumen doesn't stick to most parts of the mold, except for the ends. This helps in the easy removal of the bitumen after the test.

What is the purpose of leaving the two ends of the mold untreated with glycerin?

The untreated ends are where the bitumen is meant to stick, as part of the test process, ensuring that the bitumen remains in place during the testing procedure.

How is the bitumen poured into the mold during the experiment?

The bitumen is poured into the mold in a single continuous motion, filling the mold completely.

How long should the bitumen be left to settle after pouring?

The bitumen should be left to settle for one hour before proceeding with the testing phase.

What is the purpose of the testing machine in the experiment?

The testing machine is used to pull the bitumen at a specific speed (5 cm per minute) to assess its ability to stretch without breaking. The goal is to check if it stretches up to 100 cm without failure.

What is the condition for the bitumen to pass the test?

For the bitumen to pass the test, it must stretch up to 100 cm without breaking. This demonstrates its strength and flexibility.

What are the conditions for the test fluid used during the experiment?

The test fluid consists of water mixed with glycerin. This fluid is meant to simulate the conditions that the bitumen will face during the test.

What is the significance of the test speed being set to 5 cm per minute?

The 5 cm per minute speed ensures that the bitumen is being pulled at a consistent rate, allowing for a standardized measurement of its stretching ability.

What should be done if the test results show the bitumen does not meet the required standards?

If the bitumen does not stretch the required 100 cm without breaking, it does not meet the specified standards, and adjustments to the bitumen mix or testing procedure might be necessary.