Table of Contents
What is the normal consistency of cement?
The Standard or Normal consistency for Ordinary Portland cement varies between 25-35%. To prepare a mix of cement paste of Standard consistency 25-35% of water is added to cement. To explain in detail Let us assume a standard consistency is 30%.
Does the cement satisfy the acceptance criteria?
In all the cases 28 days strength shall alone be the criterion for acceptance or rejection of the concrete. The test results of the sample shall be the average of the strength of three specimens….Concrete Strength Acceptance Criteria IS:456-2000.
| Quantity of concrete in the work, m3 | Number of samples |
|---|---|
| 1 – 5 | 1 |
| 6 – 15 | 2 |
| 16 – 30 | 3 |
| 31 – 50 | 4 |
What is 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.
What is the amount of water required for normal consistency in percent of the weight of dry cement this value will be required in experiment 4?
Mix about 25% water by weight of dry cement thoroughly to get a cement paste. Total time taken to obtain thoroughly mixed water cement paste i.e. “Gauging time” should not be more than 3 to 5 minutes. Fill the vicat mould, resting upon a glass plate, with this cement paste.
How is standard consistency of cement is expressed?
Standard consistency of cement paste is defined as that consistency which permits the Vicat plunger to penetrate to a point 5 to 7 mm from the bottom of the Vicat mould in this test. It is expressed as amount of water as a percentage (by weight) of dry cement.
Why do we use standard consistency of cement?
It is necessary to determine consistency because the amount of water affects the setting time of the cement. So, correct proportion of water to cement is required to be known to achieve proper strength while using cement in structure. This can be found out knowing standard consistency of cement paste.
Is Cement code tested?
IS: 4031 – chemical analysis and tests on cement.
What is the characteristic strength of concrete?
Characteristic strength of concrete is the strength of concrete specimens casted and tested as per given code of practice and cured for a period of 28 days; 95% of tested cubes should not have a value less than this value.
What 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.
Why normal or standard consistency of cement varies?
Why normal or standard consistency of cement varies? Normal or standard cement consistency varies because of weather conditions, temperature, humidity, excessive composition of silica in cement, fineness of cement and we know that cement are provided and made by different companies have some different consistency.
Is standard for determination of consistency of standard cement paste is?
STANDARD • IS: 4031 (Part 4) 1988 DEFINITION • The standard consistency of a cement paste is defined as that consistency which will permit the vicat plunger to penetrate to a point 5 to 7mm from the bottom of the vicat mould. APPARATUS • Vicat Apparatus Conforming to IS: 5513-1976.