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.
What happens when an acid is added to an alkali? 1  the uses of acids and alkalis in a range of everyday situations, eg hair and skin care, treatment of stings and bites, treatment of indigestion, food preservation, treatment of soil. 2  how living things use acids, eg ants, nettles, humans in digestion. classify acids and alkalis as chemicals with distinct properties and uses. 2  use indicators to classify solutions as acidic, alkaline or neutral. 3  use the pH scale to compare the acidity and alkalinity of different solutions. 4  begin to explore neutralisation i.e. the reaction between an acid and an alkali.