What is initial set?
1. A degree of stiffening of a mixture of cement (or concrete or mortar) and water less than final set; generally stated as the time required for cement paste to stiffen sufficiently to resist the penetration of a weighted test-needle. 2.
What is initial and final setting of cement?
Initial setting time duration is required to delay the process of hydration or hardening. Final setting time is the time when the paste completely loses its plasticity. It is the time taken for the cement paste or cement concrete to harden sufficiently and attain the shape of the mould in which it is cast.
What is initial set of concrete?
Initial set, as defined by ACI 116R, is a degree of stiffening of a mixture of cement less than final set, generally stated as an empirical value indicating the time in hours and minutes required for the cement paste to stiffen sufficiently to resist to an established degree, the penetration of a weighted test needle.
What is the initial and final setting time of ideal cement mix?
The time taken by cement to gain its entire strength is a Final setting time of cement. For Ordinary Portland Cement, The Final Setting Time is 600 minutes (10hrs).
What is the initial setting time of cement 1 hour 30 minutes 15 minutes 30 hours?
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.
What is the initial setting time?
For convenience, initial setting time is regarded as the time elapsed between the moments that the water is added to the cement, to the time that the paste starts losing its plasticity.
What is the main function of set retarders?
9. What is the main function of set retarders? Explanation: Used to counteract hot weather conditions that cause increased rate of hardening. This makes placing and finishing difficult.
Is 4031 initial setting time?
The period elapsing between the time when water is added to the cement and the time at which the needle fails to pierce the test block to a point 5.0 ±0.5 mm measured from the bottom of the mould shall be the initial setting time.
What is Vicat test?
Scope: The Vicat softening temperature is the temperature at which a flat-ended needle penetrates the specimen to the depth of 1 mm under a specific load. The temperature reflects the point of softening to be expected when a material is used in an elevated temperature application.
What is a Vicat apparatus used for?
Vicat apparatus is a penetration device used in testing of hydraulic cements and similar materials to determine their normal or standard consistency. It is also used to determine the initial setting time and final setting time of hydraulic cements and similar materials.
Which cement is used for underwater construction?
Portland cement
Which chemical composition has highest content in office?
1. Which chemical compostion has highest content in OPC? Explanation: Lime forms nearly two-third (2/3) of the cement. Therefore sufficient quantity of the lime must be in the raw materials for the manufacturing of cement.
Why fly ash is used in cement?
Fly ash use in concrete improves the workability of plastic concrete, and the strength and durability of hardened concrete. Fly ash use is also cost effective. When fly ash is added to concrete, the amount of portland cement may be reduced.
Which cement has maximum percentage of C3S?
Rapid Hardening cement
Why is cement called Portland?
The inventor Joseph Aspdin, of England, patented the basic process in 1824, naming it for the resemblance of the cement when set to portland stone, a limestone from the Isle of Portland. …
What does rapid hardening cement contain?
The chemistry of rapid-hardening hydraulic cement, which differs from portland cement, is composed primarily of hydraulic tetracalcium trialuminate sulphate (CSA) and dicalcium silicate (C2S).
What is the approximate share of lime in cement?
60-65%
What is the most important constituent of cement?
The principal cementing compound is calcium aluminate (CaO · Al2O3).
Which is the main ingredient in cement?
Cement is manufactured through a closely controlled chemical combination of calcium, silicon, aluminum, iron and other ingredients. Common materials used to manufacture cement include limestone, shells, and chalk or marl combined with shale, clay, slate, blast furnace slag, silica sand, and iron ore.
Which one of the following is the main ingredient in cement?
limestone
Which of the following is the main ingredient of Halo Halo?
Halo-halo
| A bowl of halo-halo | |
|---|---|
| Course | Dessert |
| Place of origin | Philippines |
| Main ingredients | Shaved ice, milk, various fruits |
| Cookbook: Halo-halo Media: Halo-halo | |
Why do you think it is called Halo-Halo?
The origins of Halo-Halo most likely derived from a Japanese dessert called, kakigori, which was shaved ice served with sweet beans. In case you haven’t figured it out, this blog’s name comes from the famous dessert Halo-Halo. Click to learn more about the creation of Halo-Halo, Mix-Mix.
What is in Jollibee Halo-Halo?
Jollibee’s halo-halo has mung, garbanzo and white beans, plus shaved ice, coconut, evaporated milk, colored gelatin, jackfruit, sweet banana, two flavors of ice cream and caramel flan. Optional ingredients include mango, avocado, kidney beans, tapioca, melon, corn, star apple, rice crisps, grated cheese and cornflakes.
What do you observe when you combine all the ingredients of your halo-halo?
Once you mix all the ingredients together, it’s an explosion of different flavors. One bite might have a ton of fruit. The next bite will have ice cream and sweetened red beans. It’s exciting sweet adventure!
Can you still see the sugar that you mixed in your halo-halo Why?
Answer. Answer: It depends, If your stir the halo-halo properly then it will not be visible because the sugar will dissolve but if you didn’t stir it properly then yes because there will be a excess sugar that hasn’t been dissolve yet..
Why halo-halo is mixture?
Lemonade is a combination of lemon juice, water, and sugar. While, halo-halo is a combination of different fruits, ice, sugar and milk. Do you know what kind of matter lemonade and halo-halo are? They are obviously not an element because they consist of more than one substance.
Why Halo-Halo is popular?
Halo-Halo translated from Tagalog/Filipino literally means “mix-mix.” Halo-halo is a favorite Filipino dessert or snack because it is cold and refreshing, perfect for beating the tropical heat that exists almost year round in the Philippines.
Which Halo was the most popular?
The reviewers on Metacritic clearly have their favorites, and here are their collective ratings for each game.
- 1 Halo: Combat Evolved – 97.
- 2 Halo 2 – 95.
- 3 Halo 3 – 94.
- 4 Halo: Reach – 91.
- 5 Halo 4 – 87.
- 6 Halo: The Master Chief Collection – 85.
- 7 Halo 5: Guardians – 84.
- 8 Halo 3: ODST – 83.