Porosity and absorption

Due to the presence of air bubles left during the formation or on account of the decomposition of certain minerals by atmospheric effect , small holes are formed in the rock which are known as pores . All the aggregates irrespective of their source have some percentage of these pores , through which water can penetrate . An aggregates which does not have an moisture content either in the pores or on the surface is said to be bone dry aggregate . When all the pores are filled with moisture but surface is dry , it is known as saturated surface dry aggregates . When along with all the pores filled with moisture but surface is dry , it is known as saturated surface dry aggregate . When along with all the pors filled with water , surface is also wet , the aggregate is said to be moist aggregate .