Introduction to concrete and ingredient of concrete

Introduction to concrete and ingredient of concrete

1. Unit I Introduction to Concrete & Ingredients of Concrete Welcome Pravara Rural Engineering College, Loni Department of Civil Engineering Course: Concrete Technology (201010) Class : Second year Subject Teacher : Dr. Kolase P. K.

2. Test on Cement

3. Test on Cement

4. Initial and Final Setting Time of Cement

5. Cement is identified by its grade like 53 grade, 43 grade, 33 grade of cement. This grade indicates the compressive strength of cement, i.e. 53 grade of cement indicates that compressive strength of cement cube after 28 days of curing will be  53 N/mm 2  ( MPa ) or 530 kg/cm 2 Compressive Strength of Cement Soundness of Cement The soundness of cement refers to the stability of the volume change in the process of setting and hardening. If the volume change is unstable after setting and hardening, the concrete structures will crack, which can affect the quality of buildings or even cause serious accidents, known as poor dimensional stability.