Why 90° Hooks Fail in Earthquakes — 10 Concrete & Steel Questions Answered | Part 2 | EP 170

Part 2 of your DMs, answered — with the science, the logic and the IS code behind every answer. In Episode 170 of The CODE – India's No.1 Construction Podcast, Rishabh Aggarwal answers the next 12 questions you sent in: the rest of your concrete questions, everything about TMT steel, and which bricks or blocks to use. No jargon, no guesswork — just what to do on site, why it works, and which Indian Standard says so. In this episode: 00:00 Intro 00:29 Q11: How many days should concrete be cured? 01:35 Q12: When should shuttering be removed? 02:52 Q13: Can you pour concrete in extreme heat or cold? 04:10 Q14: Does concrete harden underwater? 04:45 Q15: 7-day concrete strength and cube testing 05:52 Q16: Grade and cement content for durability 06:58 Q17: Fe415, Fe500, Fe500D or Fe550D — which steel to buy? 09:15 Q18: What is TMT, and why is it better than twisted bars? 10:46 Q19: Can rusted steel be used on site? 12:03 Q20: Why do rings need 135° hooks? Missed Part 1 on cement, concrete and shuttering? Watch it here:    • Does Cement Expire? When Should Shuttering...   Note: This is general guidance. Structural decisions should always come from a licensed structural engineer. 👇 Drop your question in the comments — it could be answered in Part 3. 🎙️ The CODE – India's No.1 Construction Podcast Hosted by Rishabh Aggarwal 📺 YouTube: @indiasno1constructionpodcast 🎧 Spotify, Apple Podcasts, Amazon Music, JioSaavn, Audible