👉Why Cement Has Specific Gravity ~3.15 but Unit Weight is Only 1440 kg/m³?
⭐️If you've ever asked: “Cement’s specific gravity is 3.15 so why is its unit weight only 1440 kg/m³?”
🔰Let’s break it down in simple terms 👇
✅ What is Specific Gravity of Cement?
▶️It's the ratio of cement’s density to water’s density.
⏺Water's density = 1000 kg/m³
So, Cement’s density = 3.15 × 1000 = 3150 kg/m³.
📍BUT This is the absolute density measured in lab, without air gaps, fully compacted and used in mix design calculations.
🚧What is Unit Weight (Bulk Density)?
⏺This is the actual weight per m³ of cement as stored or handled on site.
⏺Cement particles are not tightly packed in a bag there are air voids.
🏷That’s why the unit weight is only ~1440 kg/m³.
⏺It is used when calculating volume-based cement quantity on site.
@etconp
⭐️If you've ever asked: “Cement’s specific gravity is 3.15 so why is its unit weight only 1440 kg/m³?”
🔰Let’s break it down in simple terms 👇
✅ What is Specific Gravity of Cement?
▶️It's the ratio of cement’s density to water’s density.
⏺Water's density = 1000 kg/m³
So, Cement’s density = 3.15 × 1000 = 3150 kg/m³.
📍BUT This is the absolute density measured in lab, without air gaps, fully compacted and used in mix design calculations.
🚧What is Unit Weight (Bulk Density)?
⏺This is the actual weight per m³ of cement as stored or handled on site.
⏺Cement particles are not tightly packed in a bag there are air voids.
🏷That’s why the unit weight is only ~1440 kg/m³.
⏺It is used when calculating volume-based cement quantity on site.
@etconp
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