🎯 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?”

⏺You’re not alone. 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.

#EthiopianConstructionEngineering
#SiteExecution #PlanningToBuild
#ConstructionBasics  #BuildSmart #CivilEngineering #MasonryWorks
#OnSiteLearning #ECEMS #EthiopianConstruction #Ethioconstruction

@etconp