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history of the development of cement?
- Cement history Throughout history, cementing materials have played a vital role. They were used widely in the ancient world. The Egyptians used calcined gypsum as a cement. The Greeks and Romans used lime made by heating limestone and added sand to make mortar, with coarser stones for concrete. The Romans found that a cement could be made which set under water and this was used for the construction of harbours. The cement was made by adding crushed volcanic ash to lime and was later called a pozzolanic cement, named after the village of Pozzuoli near Vesuvius. In places such as Britain, where volcanic ash was scarce, crushed brick or tile was used instead. The Romans were therefore probably the first to manipulate the properties of cementitious materials for specific applications and situations.s
Whats the difference between concrete and cement? What is the difference?
- Technically, cement is the major ingredient (along with sand, gravel, water and other possible additives) used to make concrete. So when you refer to the finished product, concrete is the proper term, though people often say cement to mean the same thing.s
How to check content cement & concrete? What do we increase strength of concrete ?
- ...do the concrete cube test.....different countries have different standards... ,,generally...the cement acts as the bonding agent for the concrete mixture..and thus the main factor that determines the resistant factor to resist compression...s
Cement Board or Plaster Board in shower?
- Both systems would work. I think the cement-board option is a little bit better. But if you want to be really sure the shower will last your lifetime. Ask the cement board contractor if he will seal the cement board before he installs the tile. Don't ask him how much extra he will charge right off let him bring that up - but expect it to cost a little more. If the floor of the shower is tile as well insist on the sealer. as well as cement board. Most contractors don't like tile floors, they tend to go with preformed one piece bottoms - highly recommend that.s
is contact cement acid or base?
- When cement is dry it contains calcium oxide, which is not particularly dangerous. However, when water is added to cement, calcium hydroxide is formed, which is extremely alkaline with a pH of 12 to 13. Normal human skin has a pH of 5.5; therefore, wet cement can produce alkaline (caustic) skin burns which progress and get worse without more exposure.s
What is the significance of silicon dioxide in portland cement?
- Allow me to qualify my answer first. When mixing cement water, in the process and as it dries hardens, air pockets tend to form inside the concrete. Air pockets are like those holes that are inside the cheese we see when we cut it. Concretes could also tend to form air pockets as it dries up firms up. Those air pockets could WEAKEN the concrete, because of the spaces inside. Now, the function of silicon dioxide is it minimize those air pockets tends to make concrete stronger.s
What percent of garnet is in cement?
- There shouldn't be any garnet in cement. Portland cement (the most common one) is a mixture of roasted limestone, clay and gypsum. None of these rocks normally contain garnets.s
HAD A TILE GUY COME LOOK AT KITCHEN FOR CRAMIC TILE HE SAID WOULD ONLY NEED 1/4 INCH CEMENT BOARD ?
- linoleum isn't an acceptable subfloor. The linoleum can stay, but the tile cannot be adhered directly to it. you would need to add the cement boards
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