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.
Alkali salts are soluble hydroxides of alkali metals and alkaline earth metals, of which common examples are: 1  Sodium hydroxide-often called caustic soda. 2  Potassium hydroxide-commonly called caustic potash. 3  Lye-generic term for either of the previous two or even for a mixture.n chemistry, an alkali (/ËaelkÉlaÉª/ ; ËÃ¦lkÉlaÉª From: arabic-al qaly, Ø§ÙÙÙÙ, âØ§ÙÙØ§ÙÙ ashes of theâ) saltwort is a, basic ionic salt of an alkali metal or alkaline earth metal chemical. Element an alkali also can be defined as a base that dissolves in. water