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Unsoundness in pozzolanic materials may be reduced by adding minor components such as alkalis or carbon which is also responsible for the color
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What are the causes of unsoundness of cement?
Unsoundness is caused by a increase in volume (eg due to hydration products) which occurs after the cement paste has set. The larger particles in coarse cement continue to hydrate well after the rest of the paste has set around them. Therefore any subsequent volume increases cannot be absorbed by the plasticity of the paste, and expansive cracking may occur.
Can you mix cement in the hole you dug?
Yes, but the walls of the hole may contaminate the cement. Mixing the cement may be very hard, and precarious. Further, you may not be able to remove all the cement from the hold afterwards. It is more advisable to use a cement-mixer.
What is the difference between cement and grout?
Grout is a substance that is used to fill gaps between tiles, such as in a shower or bathroom. Grout may be made of small aggregate, sand, and Portland cement. It may also be made of Portland cement or masonry cement and sand. There are many different types of cement, and these are usually used as an ingredient with which to make concrete and mortar.
What is soundness of cement?
Soundness of cement is the property of hardened cement paste undergoing large change in volume after setting without delayed destructive expansion. This destructive expansion is caused by excessive amounts of free lime or magnesia. This change in volume may cause crack and disintegration of concrete.Soundness of cement can be checked by using Le-Chatliers apparatus.
What is sound cement?
Soundness of cement is the property of hardened cement paste undergoing large change in volume after setting without delayed destructive expansion. This destructive expansion is caused by excessive amounts of free lime or magnesia. This change in volume may cause crack and disintegration of concrete.Soundness of cement can be checked by using Le-Chatliers apparatus.
What are the causes of unsoundness of cement?
Unsoundness is caused by a increase in volume (eg due to hydration products) which occurs after the cement paste has set. The larger particles in coarse cement continue to hydrate well after the rest of the paste has set around them. Therefore any subsequent volume increases cannot be absorbed by the plasticity of the paste, and expansive cracking may occur.
Can you mix cement in the hole you dug?
Yes, but the walls of the hole may contaminate the cement. Mixing the cement may be very hard, and precarious. Further, you may not be able to remove all the cement from the hold afterwards. It is more advisable to use a cement-mixer.
Explain two ways humans may be a threat to animals?
hunting them or damaging their habitat,both can lead to reduced numbers
What is the difference between cement and grout?
Grout is a substance that is used to fill gaps between tiles, such as in a shower or bathroom. Grout may be made of small aggregate, sand, and Portland cement. It may also be made of Portland cement or masonry cement and sand. There are many different types of cement, and these are usually used as an ingredient with which to make concrete and mortar.
What is the soundness of cement?
soundness is nothing but volumetric change of the cement .Presents of chemicals such as CaO,MgO will react with the water present in the cement paste and it will increase the volume of cement paste while hardening.It may causes cracks in the building to avoid that it is necessary to find the soundness of cement before using that.It may vary to each type of cement even for each batch.Soundness should not exceed 10mm for OPC.
Is cement conduct electricity?
Concrete it self may not but most concrete structures .Has rebar in them and that can .
Is it safe to use a hot glue gun to hang posters on cement walls?
Yes, it is safe however the posters may not stay on the cement wall. You may want to try taping the posters up as this may be more adhesive. cement is very hard and the poster may fall down if you have only hot glued it up.
What was the acc cement price in Punjab in may 2015?
250
Aldehydes and ketones may be reduced to?
alcohol
Why might an artist paint on cement blocks instead of paper?
The artist may choose cement blocks instead of paper because the cement blocks are being used for a special project, the blocks are the preferred medium, or other reasons.
Why did the artist paint on cement block instead of paper?
Because he wanted to create a "mass"terpiece
Can you have an above pool on cement?
you can but it would be best to put a layer of sand under the liner to protect it from the hard cement. Otherwise you may end up with a damaged liner.
