What is the foal of a donkey?
A foal is a baby horse, donkey, mule, zebra or pony under one year old. If you need to specify what species the foal is of, you can describe a baby zebra as a zebra foal, a baby donkey as a donkey foal or a baby mule as a mule foal. Specific foal genders are colt for a male foal and filly for a female foal.
What is an unsound argument?
An unsound argument is either an invalid argument or a valid argument with at least one false premise. Page 20. Some Final Notes on Validity and Soundness. A valid argument preserves truth. That is, if we have a valid argument, and if all of the premises are in fact true, then the conclusion will always be in fact true …
What is unsoundness of cement?
Concrete that shows excessive expansion after setting is said to contain unsound cement. Unsoundness is caused by free lime and magnesia in the clinker in sufficient quantity so that, upon hydration, excessive expansion and damage to concrete can occur.
What causes unsoundness cement?
The unsoundness in cement is due to the presence of excess of free lime than that could be combined with acidic oxide at the kiln. It is also likely that too high a proportion of magnesium content or calcium sulphate content may cause unsoundness in cement.
What is soundness of cement and how it is tested?
Soundness of cement may be determined by two methods, namely Le-Chatelier method and autoclave method. In the soundness test a specimen of hardened cement paste is boiled for a fixed time so that any tendency to expand is speeded up and can be detected. Soundness means the ability to resist volume expansion.
What is the maximum limit of soundness of cement?
The soundness limit must exceed 10 mm for ordinary, rapid hardening and low heat Portland cements. If in case the c expansion is more than 10 mm as tested above, the cement is said to be unsound. The Le Chatelier test has drawback that it detect on lime caused unsoundness.
Why sea water is not used in concrete?
Sea Water should not be used for preparation of any concrete (PCC or RCC). It has a salinity of about 3.5 per cent. In that about 78% is sodium chloride and 15% is chloride and sulphate of magnesium. This can react with reactive aggregates in the same manner as alkalies in cement.
What is the grade of cement?
PHYSICAL CHARACTERISTICS OF VARIOUS TYPES OF CEMENT?
| Sl no. | TYPES OF CEMENT | Compressive Strength (MPa) |
|---|---|---|
| 1 | 33 grade cement OPC (IS 269–1989) | 33 |
| 2 | 43 grade cement OPC (IS 8112– 1989) | Min-43 Max-58 |
| 3 | 53 grade cement OPC (IS 12269– 1987) | 53 |
| 4 | Sulphate Resisting Cement. SRC (IS 12330– 1988) | 33 |
Which is best grade cement?
Which is the best cement for house construction?
- Ordinary Portland Cement (OPC) 43 Grade Cement: It is used majorly for wall plastering works, Non-RCC structures, pathways etc.
- Ordinary Portland Cement (OPC), 53 Grade Cement:
- Portland Pozzolana Cement (PPC):
- Portland Slag Cement (PSC):
- White Cement: