CIVE1265 Concrete lab Part 1

Summary

The video script details a civil engineering lab session at Bandura East Campus, focusing on concrete casting. The process involves calculating ingredient quantities for 30 MPa concrete, measuring materials using a scale, and mixing in a concrete mixer. It demonstrates mixing dry materials first, then adding cement and water. The script also covers conducting a slump test, filling molds, and vibrating to remove air bubbles. Finally, it mentions the curing process, involving water curing for seven days before testing.

Takeaways

• 🏛️ The video is set in the Bandura East Campus, specifically focusing on the civil engineering facilities.
• 🔬 The objective is to prepare and cast 30 MPa concrete, requiring precise measurement of cement, water, sand, and aggregates.
• 📏 The script outlines the need to calculate the total volume and the required quantities of each ingredient based on a mix design.
• 📐 The calculated quantities are: cement at 5.91 kg, water at 1.9 kg, sand at 8.84 kg, and aggregate at 20.21 kg.
• ⚖️ A scale is used to measure the exact amounts of each ingredient, ensuring accuracy in the concrete mix.
• 🏗️ The smallest concrete mixer, with a 60-liter capacity, is used for mixing the concrete ingredients.
• 🔄 The mixing process involves first combining the dry materials, then adding cement, and finally, water.
• 📏 The script describes a slump test to measure the consistency of the concrete, which yields a reading of 180 millimeters.
• 🗜️ The concrete is then poured into molds, vibrated to remove air bubbles, and leveled off for uniformity.
• 🕒 After molding, the concrete specimens are left to cure for 24 hours before being demolded and placed in water curing tanks for seven days.
• 🔍 The final step involves testing the cured concrete samples, showcasing the importance of the curing process for strength and quality.

Q & A

Where is the speaker located at the beginning of the transcript?

The speaker is located in the Bandura East Campus, specifically outside building 25253.

What type of concrete is being cast according to the transcript?

The type of concrete being cast is 30 MPa concrete.

What are the four main ingredients required for the concrete mix as mentioned in the transcript?

The four main ingredients required for the concrete mix are cement, water, sand, and aggregates.

How many specimens are being prepared according to the transcript?

Five specimens are being prepared, with an additional 25% added to the total volume.

What is the required quantity of cement for the concrete mix as per the calculations in the transcript?

The required quantity of cement for the concrete mix is 5.91 kilograms.

What is the quantity of water needed for the concrete mix as mentioned in the transcript?

The quantity of water needed for the concrete mix is 1.9 kilograms.

What is the role of the 10 millimeter cross aggregate in the concrete mix?

The 10 millimeter cross aggregate is used as part of the coarse aggregate in the concrete mix.

What is the procedure for mixing the concrete as described in the transcript?

The procedure involves first mixing all the dry materials, then adding cement to the fine and coarse aggregate, and finally adding water.

What is the slump test mentioned in the transcript, and what is the recorded reading?

The slump test is a test to measure the consistency of the concrete. The recorded reading is around 180 millimeters.

How long do the specimens need to be cured in the water tank before being tested?

The specimens need to be cured in the water tank for seven days before being tested.

What is the purpose of the curing tanks mentioned in the transcript?

The purpose of the curing tanks is to soak the specimens in water for the curing process, which is essential for the concrete to gain strength.