Which needle is used in final setting time of cement?
Table of Contents
- 1 Which needle is used in final setting time of cement?
- 2 Which instrument is used for initial setting time?
- 3 What is the initial set time of concrete?
- 4 What is initial setting time Mcq?
- 5 Which compounds of cement causes initial setting?
- 6 What is Vicat needle test?
- 7 What is the initial setting time of concrete Mcq?
Which needle is used in final setting time of cement?
The Vicat’s needle (1 mm2 needle) cannot go into it within 5± 0.05 mm measured from the bottom of the mould. It should not be less than 30 minutes for OPC….Detailed Solution.
| Attachment | Test |
|---|---|
| 1. 10 mm diameter Plunger 2. 1 mm2 needle 3. 5 mm diameter Annular colar | Consistency test Initial setting time Final setting time |
Which instrument is used for initial setting time?
Vicat Apparatus
Modified Vicat Apparatus 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.
How many types of needle are used in setting time test of cement?
It consists of an arrangement to hold the plunger of 10 mm diameter and two other needles which are made to freely fall into a mould filled with the cement paste and the amount of penetration of the needles of plunder can be noted using the vertical graduations from 0 mm to 50 mm.
What is the initial set time of concrete?
Initial Setting Times for Concrete In standard industrial cases, full strength concrete is recognized at 28 days. At seven days, you should have concrete that is cured to 70\% full strength or greater. But to answer the question of, “How long does concrete take to set?” concrete setting time is generally 24 to 48 hours.
What is initial setting time Mcq?
This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Setting Time Test”. 1. Explanation: The time at which cement paste loses its plasticity is known as initial setting time of the concrete.
What is the initial setting time of OPC?
30 min
Initial and Final Setting Time of OPC Cement? For OPC, the Minimum setting initial setting is 30 min and the maximum final setting time is 600 min.
Which compounds of cement causes initial setting?
The initial setting of Portland cement is due to tricalcium aluminate. Tricalcium aluminate (C3A): This is also called Celite. It is the quickest one to react when the water is added to the cement.
What is Vicat needle test?
The Vicat test is used for testing materials that have no real melting points. The main principle is that it measures the temperature at which a flat ended needle is able to penetrate the sample. This is known as the softening point of the material.
What is the diameter of the needle used in initial setting time?
The device which is used to find the initial setting time of cement is called as Vicat apparatus. It has a square needle of 1 mm size and 50 mm length and a mould, which is 40 mm in height and 80 mm in diameter.
What is the initial setting time of concrete Mcq?
What is the initial setting time? Explanation: The time at which cement paste loses its plasticity is known as initial setting time of the concrete. Explanation: As per IS specification, the minimum initial setting time is 30 minutes for ordinary portland cement.