What is standard consistency of a cement paste?
The standard consistency of a cement paste is defined as the percentage of water added In 300gm weight of cement which will permit a Vicat plunger having 50 mm length and 10 mm diameter to penetrate in cement paste to a depth of 33-35 mm from the top of the mould.
How do you test the consistency of cement?
Procedure to determine consistency of cement i) Weigh approximately 400g of cement and mix it with a weighed quantity of water. The time of gauging should be between 3 to 5 minutes. ii) Fill the Vicat mould with paste and level it with a trowel. iii) Lower the plunger gently till it touches the cement surface.
How do you calculate normal consistency?
Take 400g of cement and place it in a bowl or tray. Now Assume standard consistency of water is 28% and add the same quantity of water in cement and mix it. Mix the paste thoroughly within 3-5 minutes. The time taken to obtain cement paste after adding water is called gauging time.
Which apparatus is used for consistency test of cement?
Vicat’s apparatus is used to perform this test. As per Vicat’s test ‘the percentage of water added to the cement at which the needle can not penetrate 5-7 mm from bottom of the mould is called consistency. In order to make a cement paste of normal consistency the percentage of water varies from 25 to 35%.
What is concrete consistency?
A. Consistency is the relative mobility or ability of freshly mixed concrete to flow. It includes the entire range of fluidity from the driest to the wettest possible mixtures. Plastic consistency indicates a condition where applied stress will result in continuous deformation without rupture.
What is the standard consistency?
What is standard consistency? Explanation: Standard consistency of cement paste may be defined as the consistency which permits the Vicat’s plunger (10 mm, 40 to 50 mm in length) to penetrate to a point 5 mm to 7 mm from the bottom ( or 35 mm to 33 mm from top) of Vicat mould.
What is the normal consistency?
1. The degree of wetness exhibited by a freshly mixed concrete, mortar, or neat cement grout whose workability is considered acceptable for the purpose at hand.
Why is cement consistency?
The consistency of cement paste is defined as the percentage of water requirement of cement paste at which the viscosity of paste in such a way that it determines the amount of water needed to make a paste. It is necessary to determine consistency because the amount of water affects the setting time of the cement.
What is concrete Consistency?
What do you understand by Consistency of cement?
Consistency of cement is defined as minimum quantity of water added in cement to form uniform paste that provide sufficient viscosity and desirable strength for different type of structural work. Adding less or excess amount of water in cement causes reduction in its strength.
What are the factors affecting the consistency of cement?
The Normal consistency of cement paste depends upon the factors such as temperature and fineness of cement. Higher the temperature and higher the fineness of cement results higher the normal consistency of cement and vice versa.
What is the standard consistency of a cement paste?
1. The standard consistency of a cement paste is defined as that consistency which will permit the Vicat plunger (5mm) to penetrate to a point 5 to 7 mm from the bottom of the Vicat mould. 2.
What is cement consistency test?
Cement Consistency Test – Standard Consistency of Cement by Vicat Apparatus A Minimum quantity of water required to initiate the chemical reaction between water and cement to form a paste is known as consistency of cement.
How to calculate the amount of water required for cement consistency?
For Example, If we need to calculate the amount of water required for a 200 g of cement which has 30% consistency means then we need 200*30% = 60g water to prepare a standard consistency. This is what we are going to find in this test. Cement Consistency Test with Vicat Apparatus The whole test is conducted in test and error method.
What is the standard consistency of hydraulic cement?
For a mortar the standard consistency is measured by flow table test. Generally the normal consistency for OPC ranges from 26 to 33%. IS:4031 (Part 4):1988-Methods of physical tests for hydraulic cement (Determination of consistency of standard cement paste)