WHAT IS CEMENT
- CEMENT IS USED FOR CONSTRUCTION PURPOSE AS BINDERS WHICH SETS HARDENS AND ADHERES TO OTHER MATERIALS TO BIND THEM TOGETHER
- CEMENT MIXED WITH SAND PRODUCES MORTAR
- CEMENT MIXED WITH SAND GRAVEL PRODUCES CONCRETE
- CEMENTS ARE USALLY MADE OF LIME OR CALCIUM SILICATE, THEY CAN BE CHARACTERIZED INTO NON HYDRAULIC AND HYDRAULIC CEMENT.
- WHICH DOES NOT SET IN WET CONDITIONS, IT SETS IN DRY CONDITION IT DRIES AND REACTS WITH CARBON DIOXIDE IN AIR.IT IS RESISTANCE TO ATTACK BY CHEMICAL AFTER SETTIN
- WHEN CALCIUM OXIDE MIXED WITH WATER HARDENS BY CARBORATION IN THE PRESENCE OF CARBO DIOXIDE WHICH IS NATURALLY PRESENT IN THE AIR FIRST CALCIUM OXIDE IS PRODUCED FROM CALCIUM CARBONATE BY CALCINATION AT ATMOSPHERIC PRESSURE.
- CaCo3-----CaO+CO2
- CALCIUM OXIDE IS MIXED WITH WATER TO MAKE CALCIUM HYDROXIDE
- CaO+H2O-----Ca(OH)2
- ONCE THE WATER IS COMPLETELY DRIED THE CARBORATION STARTS
- Ca(OH)2+CO2-----CaCO3+H2O
- THE REACTION IS SLOW AS CARBO IN THE AIR IS LOW
- CEMENT HARDENS BY HYDRATION WHEN WATER IS ADDED
- HYDRAULIC CEMENT / PORTLAND CEMENT ARE MADE OF MIXTURE OF SILICATES AND OXIDES THE FOUR MAIN COMPONENTS BEING
- BELITE , ALITE, TRICALCIUM ALUMINATE, BROWNMILLERITE
- SILICATES ARE RESPONSIBLE FOR CEMENTS MECHANICAL PROPERTIES.