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 pH is increased with soda ash which is also called sodium carbonate. Most pool companies simply name the product pH increaser or pH add. The alkalinity is increaed with sodium bicarbonate which is also called baking soda. Most pools companies name the product total alkalinity increaser.Regular baking soda can be used but you may have to use alot.est Answer: Raise alkalinity with sodium bicarbonate. Adjust it first, then tweak the pH with soda ash. To lower either one use acid.