What questions might a panelist ask about a final project proposal regarding scrap tires in concrete, and what would be the answers?

Here are some potential questions a panelist might ask about your final project proposal, along with concise answers based on the provided text:

• Question 1: What is the primary environmental problem your research aims to address?

  • Answer: The primary problem is the serious environmental pollution caused by the accumulation of scrap tires, which decompose at a very slow rate.

• Question 2: How did you incorporate powdered rubber into the concrete mixtures, and what methods were used for reinforcement?

  • Answer: Powdered rubber was incorporated as a partial replacement for both sand and cement. Reinforcement was done using two physical methods (silica foam and cement coating) and three chemical methods (sodium hydroxide, sulfuric acid, and potassium permanganate).

• Question 3: What was the general effect of adding powdered rubber on the compressive strength of the concrete?

  • Answer: Generally, the addition of powdered rubber reduced the compressive strength of the concrete, showing an almost inverse proportional relationship with the amount of rubber added.

• Question 4: Between replacing sand and replacing cement with powdered rubber, which approach showed better results for compressive strength?

  • Answer: Powdered rubber replacement for sand showed better results in terms of compressive strength compared to cement replacement.

• Question 5: What impact did the addition of rubber have on the thermal properties of the concrete?

  • Answer: A higher amount of rubber in the concrete resulted in less heat conduction, indicating that it can be effective for energy saving due to improved thermal insulation.

• Question 6: What was a significant challenge encountered when mixing rubber with concrete, and how did reinforcement methods help?

  • Answer: A significant challenge was the hydrophobicity of rubber, which made it difficult to mix well with other concrete components. The reinforcement methods were effective in making the rubber surface hydrophilic, improving its combination with other ingredients.