Objective: To assess the soundness of cement by Le-chatelier Method Apparatus Le chatelier mould The mould comprises of a very minute split cylinder made out of spring brass or some other compatible metal of 0.5mm density creating of a mould 30mm interior diameter and 30mm height. On both sides of the split, they are joined […]
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Production of Coloured Finishes with White Cement: Colours Desired Commercial Names of Colours Approx. Qty necessary (kg per bag of cement) Light Shade Medium Shade Greys, blue-black and black Lampblack*, or carbon black* or black oxide of manganese* or mineral black 0.25 0.25 0.50 0.50 0.50 0.50 1.0 1.0 Blue Ultramarine blue 2.30 […]
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The determination of specific gravity is usually described as the ratio between the mass of a specified volume of substance and weight of an equivalent volume of water. To resolve the specific gravity of cement, kerosene which do not react when mixed with cement is utilized. Apparatus Le Chaterlier”s flask, weighing balance, kerosene (free from […]
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Types of Portland cement Many kinds of Portland cement are produced to meet the needs for various purposes American Society for Testing and Materials (ASTM) designation C150 has specified the 8 types of Portland cement. Type Name Type I Normal Type IA Normal, air entraining Type II Moderate sulfate resistance Type IIA Moderate sulfate resistance, […]
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Objective: To assess the volume of water needed to create a cement paste of standard consistency. The standard consistency refers to that consistency, which will allow the vicat plunger to break through a to a point 5 to 7mm from the base of the vicat mould or cast when tested as explained below: Apparatus Vicat […]
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Materials and Tools utilized Wooden /Steel rammer – 1 Nos Mixer machine – 1 Nos Auto level instrument – 1 Nos Scope of work Verification of dimensions and levels Ramming of the ground surface Putting the concrete. Finishing and ramming the concrete surface Working Procedure Excavation dimensions and levels should be checked in accordance with […]
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Objective: To determine the final setting time of cement. This test is required to understand the rate of gain of strength of cement with respect to time. Apparatus Vicat apparatus, needle for initial setting time, stop watch. Theory Final setting time is the time when the cement paste completely loses its plasticity. It is the […]
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This test is needed to assess the initial setting time frame of cement, and to comprehend the time-frame cement takes for initial setting among the blending and shifting and placing of concrete. Apparatus Vicat apparatus, needle for initial setting time, stop watch. Procedure We have to 400 gm of cement and put it in a steel […]
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Physical and Chemical Properties of Ordinary Portland Cement (OPC) of different grades: Type of Cement 33 Grade (IS: 269-1989) 43 Grade (IS:8112-1989) 53 Grade (IS: 12269-1987) Physical Properties Minimum Compressive Strength, N/mm2 3 day 16 23 27 7 day 22 33 37 28 day 33 43 53 Fineness Minimum specific surface (Blaine’s air permeability) m2/kg […]
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The breakdown regularly appears as a dynamic de-holding of the plaster of mortar/cement from the surface of the solid and for the most part begins with the development of little hollow zones. This condition for the most part weakens until the plaster on an entire divider gets to be unbonded and lumps exteriorly. On soffits, […]
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