One hectare comprises between 1.2 and 1.6 football pitches, as soccer fields are known in British English. An internationally-sanctioned soccer field is 100 to 110 meters in length by 64 to 75 meters in width, comprising between 0.62 and 0.82 hectares depending on the field. Keep Learning.
From Wikipedia, the free encyclopedia. Alkaliâaggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non-crystalline silicon dioxide, which is found in many common aggregates.he alkaliâaggregate reaction is a general, but relatively vague, expression which can lead to confusion. More precise definitions include the following: 1  Alkaliâsilica reaction (ASR, the most common reaction of this type); 2  Alkaliâsilicate reaction, and; 3  Alkaliâcarbonate reaction.
The reason alkalinity is sometimes confused with pH is because the term alkaline is used to describe pH conditions greater than 7 (basic). The most important compounds in water that determine alkalinity include the carbonate (CO3 2-) and bicarbonate (HCO3 -) ions.arbonate ions are able to react with and neutralize 2 hydrogen ions (H +) and the bicarbonate ions are able to neutralize H + or hydroxide ions (OH -) present in water. The ability to resist changes in pH by neutralizing acids or bases is called buffering.