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Is a cement sidewalk a homogeneous mixture?
No, a cement sidewalk is not a homogeneous mixture because it is made up of different components like cement, sand, gravel, and water that are not uniformly distributed throughout the material. It is more accurately described as a heterogeneous mixture.
In the evening snow falls on a cement sidewalk and on a black top playground. which surface will melt the snow faster and why?
The blacktop playground will melt the snow faster than the cement sidewalk. This is because blacktop, or asphalt, absorbs more heat from the sun due to its darker color, which increases its surface temperature. As a result, the heat from the blacktop helps to melt the snow more quickly compared to the lighter-colored cement sidewalk, which reflects more sunlight and retains less heat.
Is a concrete sidewalk homogeneous?
Yes, a concrete sidewalk is considered homogeneous because it is composed of the same material throughout its structure, providing consistent properties and appearance across its surface.
How hot does it have to be to fry an egg outside on the cement sidewalk?
It needs to be at least 130°F (54°C) for an egg to cook on a sidewalk. The concrete's surface temperature needs to be hot enough to reach the minimum cooking temperature of an egg (around 158°F or 70°C) for it to fry.
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.
Should a sidewalk be made of cement or concrete?
Concrete is what you make a sidewalk from. To make concrete, you mix Portland cement, sand, gravel (aggregate) and water. The cement holds the aggregate together.
Is it illegal to write in wet sidewalk cement?
Yes, it is generally considered illegal to write in wet sidewalk cement without permission as it can be considered vandalism or property damage. It is best to refrain from doing so to avoid potential legal consequences.
Do you have to have cement to build a sidewalk?
To build a cement sidewalk, yes. But if you wanted to make a sidewalk out of something else, you could. My aunt used to have wooden sidewalks on her farm. Some areas just have dirt sidewalks, but it is still a sidewalk because it is still actually a place off the road where you are meant to walk.
How has cement changed lives?
Cement changed people lives because it help us make sidewalk and other stuff the evovles cement
Is a cement sidewalk a homogeneous mixture?
No, a cement sidewalk is not a homogeneous mixture because it is made up of different components like cement, sand, gravel, and water that are not uniformly distributed throughout the material. It is more accurately described as a heterogeneous mixture.
Can a dog paw get injured on cement?
On regular cement in spring or faill it won't. It depends too, if there is stuff on the cement sidewalk. Plus, if your talking but soild cement or in process of becoming hard. Cement in the winter like a sidewalk might be too cold depending on the temp outside. In the summer, the cement might be too hot and burn your dog's paw. Depends on the temp outside...
Why is foundation cement gray and sidewalk cement white?
The cement is grey due to the presence of iron oxide.The cement is white due to the absence of iron oxide.Generally white cement has more strength than grey cement and it is more expensive.
What are the lines called in the sidewalk?
The separation between squares of sidewalk cement is usually referred to as a crack, although I think that gap might be more accurate.
Why does a black asphalt road become hotter than white cement sidewalk in the same amount of sunlight?
The darker the color of the road the more sunlight it absorbs. A white cement sidewalk is whiter which absorbs many of the colors making it cooler.
What do the british call sidewalk?
A sidewalk in the UK is called "pavement" or "foot path"
How much cement is needed to build a sidewalk that is 132 inches long 24 inches wideand 3 inches think?
Well, you make a sidewalk from concrete, not just cement. Concrete consists of cement, sand, gravel and water. You will need 5.5 cubic feet of concrete. A standard sidewalk grade of concrete would be 1 part cement, 2 parts sand, 3 parts gravel- so the sidewalk needs 0.91 cu ft of cement- about 87 pounds worth- plus sand and gravel. If you want to buy the premixed bags of concrete (like Sacrete), you will need about 17 of the 40 pounds bags. And you did not ask, but 3 inches is kind of skinny- I would go for at least a 4 inch thick sidewalk.
What do the British call a sidewalk?
A sidewalk in the UK is called "pavement" or "foot path"
