Free CT 1: Current Affairs (Government Policies and Schemes) 10 Questions 10 Marks 10 Mins Standard consistency test: This test determines the percentage of water required to make workable cement paste. Vicat’s apparatus is used to perform this test. Temperature during test = 27 ± 2°C Relative humidity = 90% 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.
|Tests on cement
|Apparatus or method
|Sieve method or Air permeability test
|Standard consistency test
|Initial setting time test
|Vicat’s apparatus (Vicat’s needle)
|Final setting time test
|Vicat’s apparatus (Vicat’s needle)
|Compressive strength test
|Universal Testing Machine (UTM)
|Tensile strength test
|Standard briquettes test Michaeli’s compound lever apparatus
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- 1 Which needle is used for testing standard consistency of cement?
- 2 Which of the following is used to measure consistency?
Which apparatus is used to determine the consistency of cement?
Standard Vicat Apparatus has a reversible stainless steel plunger and needle assembly for 300g total weight. It is used to determine consistency and initial/final set times of cements and mortar pastes.
Which needle is used for testing standard consistency of cement?
Vicat Apparatus Test – One of the most common ways to assess cement consistency is with a Vicat apparatus. This machine is used to determine the standard consistency of a cement paste, as well as its initial and final setting time. To establish a paste’s standard consistency, a Vicat plunger is used.
More » Vicat Apparatus Test, continued Standard consistency is defined by the minimum amount of water at which the Vicat plunger is able to penetrate 5-7mm from the bottom of the Vicat mold. This consistency, in theory, will produce cement at its maximum strength. To establish a paste’s initial and final setting times, a Vicat needle is used.
The initial setting time is defined as the time period between when water is added to the cement and when the 1mm needle fails to penetrate the paste. The final setting time, rather, is determined by the time period between when water is added to the cement and when the 1mm needle makes an impression on the paste but the 5mm needle does not.
How do you determine the standard consistency of cement?
🕑 Reading time: 1 minute The standard consistency of cement is that consistency, which permit the vicat plunger to penetrate to a point 5 to 7mm from the bottom of the vicat mould when tested. Procedure to determine the quantity of water required to produce a cement paste of standard consistency is described below.
Which type of needle is used in consistency?
Consistency Test of Cement Consistency Test of Cement is carried out inorder to find the determine the percentage of water required for preparing cement pastes for other tests. Test Procedure to Find the Consistency of Cement: 1. Take an empty enameled pan free from dirt and other foreign particles.2.
Now take 300 gm of, and put that in the pan.3. Add water, the quantity of water should be 30 per cent by weight of or 90 gm of water to it.4. Mix the cement and water thoroughly.5. Now, fill the cement paste in the mould of vicat apparatus, the interval between the addition of water to the commencement of filling the mould is known as the time of gauging and it should be between 3 to 4 minutes.6.
The Vicat apparatus is shown in the below figure. It consists of a frame to which is attached a movable rod weighing 300 gm and having diameter and length as 10 mm and 50 mm respectively. An indicator is attached to the movable rod. This indicator moves on a vertical scale and it gives the penetration.
- The Vicat mould is in the form of a cylinder and it can be split into two halves.
- The Vicat mould is placed on a non-porous plate.
- There are three attachments — square needle, plunger and needle with annular collar.
- The square needle is used for initial setting time test, the plunger is used for consistency test and the needle with annular collar is used for final setting time test.7.
The plunger is attached to the movable rod of Vicat apparatus. The plunger is gently lowered on the paste in the mould.8. The settlement of plunger is noted. If the penetration is between 5 mm to 7 mm from the bottom of mould, the water added is correct.
Which apparatus is used for soundness test of cement?
Free RSMSSB JE General Knowledge Free Mock Test 10 Questions 10 Marks 8 Mins Explanation: Expansion of cement is measured/computed by soundness test. Soundness means the ability to resist volume expansion and it is indication durability. The unsoundness in cement is due to the presence of an excess of free lime than that could be combined with acidic oxide at the kiln.
The Le-Chatelier test detects unsoundness due to free Lime only. This method of testing does not indicate the presence and after effect of the excess of magnesia. As per Indian Standard specification, if the content of magnesia is greater than 3% in cement then Autoclave Test is performed which is sensitive to both Lime and Magnesia.
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Which of the following is used to measure consistency?
Therefore, reliability is a measure of consistency.
Which of the following is used to determine the consistency of fresh concrete?
Answer (Detailed Solution Below) – Option 2 : Slump test Free MPSC AE CE Mains 2019 Official (Paper 1) 100 Questions 200 Marks 120 Mins Concept: Workability of concrete: Workability is the relative ease with which concrete can be mixed, transported, molded, and compacted.
- We can also say, it is the energy to overcome friction while compacting.
- The workability of concrete can be measured using the following methods, 1) Slump test: The slump test is a measure of consistency or the wetness of the concrete mix.
- It is suitable for field applications, suitable for concrete of high and medium workability,
Slumps for various types of concrete are measured in mm.2) Compacting factor test: It is more accurate than a slump test. It is suitable for concrete mixes of medium and low workability, It is suitable for determining workability in the laboratory,3) Vee-bee consistometer: The time required for complete remoulding of concrete in seconds after placed in the mould with a slump cone.
It is expressed in seconds, It is the method used to determine the workability of very dry mixes with low workability.4) Flow table test: Based on the percentage flow the workability of the concrete is determined. The values could range from 0 to 150 % 5) Kelly ball test: It is a simple field testing machine that determines the depth to which a 15 cm diameter metal hemisphere weighing 13.6 kg, will sink under its own weight into the fresh concrete.
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Which is the apparatus used for cement soundness test?
Soundness of Cement. – Soundness of cement is the ability of a hardened paste to retain its volume after setting. A cement is said to be unsound (i.e., having lack of soundness) if it is subjected to delayed destructive expansion. Unsoundness of cement is due to presence of excessive amount of hard-burned free lime or magnesia. This depends on its original composition, proper burning, and grinding. Presence of lime in the free state, an excess of sulfate or magnesia and a very fine size may be the cause of soundness in cement. The Indian Bureau of Standards has specified the le chatelier apparatus test – the same as adopted by British and American Standards for soundness test of cement.
What is Vicat apparatus?
: a device for determining the normal consistency and time of setting of portland cements that consists of a rod weighing 300 grams, having a needle in each end, and supported in a frame with a graduated scale to measure the distance to which the needle penetrates the cement
What is the test to determine the consistency of concrete?
The slump test is the most well-known and widely used test method to characterize the workability of fresh concrete. An inexpensive test, which measures consistency, is used on job sites to determine rapidly whether a concrete batch should be accepted or rejected.
Which equipment is used to test the setting of cement?
AUTOVICAT by IBERTEST is an equipment for automatic execution of determination of setting time and consistency of cement test by Vicat method.