LAB IN YOUR GRASP - KARAKTERISASI MATERIAL BETON : 05 pH FLY ASH

Summary

In this video, researchers Adlizie and Panglima from the Geopolymer Research Consortium LBE Green Concrete demonstrate a unique lab testing process called 'Lab in Your Grasp.' The test aims to determine the pH level of fly ash, a material used in green concrete. The video guides viewers through the step-by-step procedure, including the preparation of the sample, equipment needed, and how to measure the pH accurately. With an engaging presentation, this video offers an informative insight into the significance of fly ash testing for sustainability in construction.

Takeaways

• 😀 The script is an introduction to a lab testing process for fly ash pH levels in the context of geopolymer research.
• 😀 The video is hosted by two researchers, Adlizie and Panglima, from the Geopolymer Research Consortium LBE Green Concrete.
• 😀 Fly ash is classified into two categories: F class and C class, based on its chemical composition.
• 😀 The main indicator used to distinguish between F class and C class fly ash is the pH value.
• 😀 The pH of fly ash is affected by its CaO (calcium oxide) content, with F class typically having less than 10% CaO and C class having more than 10%.
• 😀 The video demonstrates a pH test on F class fly ash to determine its pH value.
• 😀 The equipment required for the pH test includes a 600 ml beaker, 250 ml beakers, distilled water, a glass funnel, filter papers, a digital scale, a magnetic stirrer, and a pH meter.
• 😀 The process involves weighing 50 grams of fly ash, adding distilled water at a 4:1 ratio, and mixing using a magnetic stirrer for 10 minutes.
• 😀 The mixture is filtered using filter paper, and the filtered solution is tested for pH with a pH meter.
• 😀 After testing, the pH value of the sample is recorded as 8.89, and it is recommended to repeat the test for accuracy.
• 😀 The video encourages viewers to like, subscribe, and turn on notifications for future content related to lab testing and geopolymer research.

Q & A

What are the two classes of fly ash mentioned in the script?

Fly ash is classified into two classes: F class and C class. These are classified based on their chemical composition, specifically the levels of CaO (Calcium Oxide).

What is the primary indicator used to distinguish between F class and C class fly ash?

The primary indicator to distinguish between F class and C class fly ash is the pH value of the fly ash, which is influenced by the CaO level.

How does the CaO level differ between F class and C class fly ash?

In F class fly ash, the CaO level is typically below 10%, while in C class fly ash, the CaO level is above 10%.

What is the purpose of the pH test in this experiment?

The pH test is performed to determine the pH value of the fly ash sample, which helps to classify it into either F class or C class based on the pH level.

What materials and equipment are used for this pH testing process?

The materials and equipment required include a 600 ml beaker, two 250 ml beakers, distilled water, a glass funnel, an iron bowl, Whatman filter papers, a plastic spoon, tissue, a digital scale, a magnetic stirrer, a magnetic stir bar, and a pH meter.

How is the fly ash sample prepared for the pH test?

The fly ash sample is weighed to 50 grams, and distilled water is measured in a 4:1 ratio with the fly ash. The mixture is then placed in one of the 250 ml beakers.

What role does the magnetic stirrer play in the experiment?

The magnetic stirrer helps to mix the fly ash and distilled water solution by stirring it at a speed of 650 RPM for 10 minutes, ensuring proper dissolution of the components.

Why is it important to filter the mixture using the Whatman filter paper?

The filtration step ensures that the fly ash does not pass through the filter paper, allowing only the liquid portion of the solution to be collected for pH measurement.

How do you measure the pH of the filtered liquid?

The filtered liquid is poured into a beaker, and the pH meter's electrode is immersed in the liquid. The 'read' button is pressed, and the pH value is recorded once the indicator stops blinking.

What steps should be taken to clean the pH meter after use?

After the test, the electrode tip should be cleaned by spraying it with distilled water and wiping it with tissue. The electrode is then placed in the electrolyte fluid for storage.

How many times should the pH test be performed for accuracy?

The pH test should be performed at least twice to obtain an average result, ensuring the accuracy of the pH value.

What is the pH value of the fly ash sample in this experiment?

The pH value of the fly ash sample in this experiment was found to be 8.89.