0
m15- 6.25
m20 - 6.8
m25 - 7.5
m30- 8.5
m35- 9
m40 - 10
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When does hydration in concrete start?
As soon as the Cement comes into contact with water. This will start as soon as the cement and aggregates come into contact unless the aggregates have been dried of all surface water.
How many 80 lb bag of concrete 50 lb bag of sand and 50 lb bag of gravel does it take one yard of concrete mix?
This all depends on the mix you want. I assume you mean cement when you mention the 80lb bag of concrete. I have pushed concrete in my day... Bag cement mix is the same as concrete. Don't be funny. How many 80 pound bags will make 1 yard of concrete? I want a definitive answer this time.
What is the definition and specifications of fair-faced concrete?
Fair faced concrete is one which after removal of form work is not required to have any further finishes on it like plastering, etc. Since concrete surface is intended to remain visible all relevant specifications of the concrete surface need to be given in the Tender. Broadly speaking these specification besides giving compressive strength, etc. of the concrete should also be dealing with desired appearance of the concrete. As in all works, they should also specify tolerance limits of defects or blemishes for fair faced concrete. Generally blemishes associated with Fair faced concrete are Blowholes, Steps, Fins, Colour variation, etc. For details and better understanding you may refer to 'Guide to Off form concrete finishes' published by Cement Concrete and Aggregates Australia' Though in India we do not follow it I found it interesting and quite in detail.
How do you calculate void ratio in concrete?
1) weight of cement in one cube divided by density of cement = volume of cement in a cube: 2) Similarly volume of fine & Coarse aggregate can be calculated 3) Adding all one will get volume of solids in a Cube-Vs: 4) Subtracting Vs from volume of cube Vc one would get volume of voids Vv 5) taking ratio of Vv to Vs one would get void ratio
Why is ready mix concrete required in place of on site mixing of concrete?
That requirement is not true of all jurisdictions. In many areas you can mix onsite if you wish. There may have been lobbying by environmental groups or even cement companies to cause this requirement in your area. The point is why would you mix onsite? Unless you have a very small job or great distance to transport the cement to the job, it is more efficient, cheaper, and cleaner to use ready mix. It is cost effective. Some construction site require site mixing just to save time and money.
How does cement make concrete building?
cement is made with water cement mixture and sand after all of this is added
How do you make cement or concrete?
cement/ concrete is made with water, cement mixture and sand. After all of this is added to the right amount, you mix, mix, mix!! Then bofore it drys, pour it ontop the location desired
How water cement ratio and workability is related to compaction factor?
If you are talking about shrinkage, then quite a bit. To make concrete, cement and water react together. There is a specific amount of water required to hydrate the concrete. Any water extra must leave the concrete and while it makes the concrete more workable, hurts the concrete is several ways. The volume of the concrete will change by whatever excess water you have added. To get workability, it's always best to use a water reducing admixture.
What substance slows down the setting of cement?
Gypsum slows down the setting of cement. Although the terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Concrete is basically a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement. Concrete gets stronger as it gets older. Portland cement is not a brand name, but the generic term for the type of cement used in virtually all concrete, just as stainless is a type of steel and sterling a type of silver. Cement comprises from 10 to 15 percent of the concrete mix, by volume. Through a process called hydration, the cement and water harden and bind the aggregates into a rocklike mass. This hardening process continues for years meaning that concrete gets stronger as it gets older. So, there is no such thing as a cement sidewalk, or a cement mixer; the proper terms are concrete sidewalk and concrete mixer.
What is wet works in construction?
All activities related to unset cement or concrete.
Why cement can hard?
Concrete has Portland cement in it. Portland cement is finely ground limestone that is baked until there is no water in it at all. After concrete is poured, the water in it starts chemically combining with the Portland cement, slowly turning it back into limestone . . . sort of. After 3 days, the concrete is hard enough to use . . . walking on or driving on with a light car, but it takes 28 days for concrete to harden to its full rated strength so it is usable in building, bridges, and so on.
What is the concrete mixing ratio in m60 concrete?
cemet: sand: Agg=1:1:2 (Nominal Mix) Above answer is not as per engineering standards. For concrete mixing ration in M30 grade concrete, the mix has to be designed after testing all the materials including water in labs. When you go for higher grade of concretes the mix has to be designed , it is the water to cement ratio which has to be monitered for higher grades of concrete
What consideration affects the type of aggregate used in concrete construction?
Ordinary structural concrete is characterized by its water-to-cement ratio. The lower the water content, all else being equal, the stronger the concrete
What were all the materials used in the construction of the Hill brow Tower?
Mainly cement, concrete, steel and glass (for the windows)
1 cubic meter is equal to how much kg of cement?
Cement content varies on concrete type, but is typically 400kg per cubic metre. According to the manufacturer, Portland Cement (which is what 99.9% of all cement actually is) has a density of 1505kg/cubic meter.
When does hydration in concrete start?
As soon as the Cement comes into contact with water. This will start as soon as the cement and aggregates come into contact unless the aggregates have been dried of all surface water.
What are employment opportunities for a cement finisher?
There are alot of opportunities. There are masonary jobs and concrete jobs in all fields of concrete from small independent concractors to building builders and hiway jobs.
