Download e-book for kindle: Introduction to Concrete Technology by Dr. Amanullah Marri

By Dr. Amanullah Marri

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The rapid rate of developing strength is attributed to the higher fineness of grinding, higher C3S and lower C2S content. Should not be used in mass concrete construction 33 EXTRA RAPID HARDENING CEMENT 34 EXTRA RAPID HARDENING CEMENT 35 SULPHATE RESISTING CEMENT 36 SULPHATE RESISTING CEMENT 37 QUICK SETTING CEMENT 38 LOW HEAT CEMENT 39 SIEVES 40 SIEVES 41 CEMENT MANUFACTURING 42 EXTRACTION OF RAW MATERIALS 43 GRINDING AND STORAGE OF RAW MATERIALS 44 THE FIRING OF RAW MATERIALS 45 CEMENT CLINKERS STORAGE AND GRINDING OF CEMENT 47 CEMENT 48 PACKING 49 PACKING AND SHIPMENT 50 SETTING AND HARDENING OF CEMENT When cement is mixed with water a stiff and sticky paste is formed, which remains plastic for a short period.

It is difficult to draw a rigid line between these two arbitrary divisions. For convenience, initial setting time is regarded as the time elapsed between the moment that the water is added to the cement, to the time that the paste starts losing its plasticity. The final setting time is the time elapsed between the moment the water is added to the cement, and the time when the paste has completely lost its plasticity and has attained sufficient firmness to resist certain definite pressure. 85 times the water required to give a paste of standard consistency.

For convenience, initial setting time is regarded as the time elapsed between the moment that the water is added to the cement, to the time that the paste starts losing its plasticity. The final setting time is the time elapsed between the moment the water is added to the cement, and the time when the paste has completely lost its plasticity and has attained sufficient firmness to resist certain definite pressure. 85 times the water required to give a paste of standard consistency. Start a stop-watch, the moment water is added to the cement.

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Introduction to Concrete Technology by Dr. Amanullah Marri


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