Cement for building mortar shall be Portland cement complying with the requirements of ESC D5 201.
Lime for building mortar shall be hydrated lime complying with the requirements of ESC D5 003.or quick lime complying to BS 890 giving a compressive strength of 20kg/cm2 for a lime/sand mix 1:3 proportion after slacking for 2 hours.
Quick lime shall be slaked on site for as long as necessary but not less than 14 days.
Quick lime shall be slaked in boxes or lined pits, ensuring that no contact is made with earth or other objectionable material. Sufficient water shall be added to make the liquid volatile. All impurities and solid material shall be filtered out of the lime before it is used for the works.
Lime from different sources or different stacking time shall not be used in any one mix.
Lime shall be used in the order delivered.
Aggregate for building mortar shall be natural occurring river or pit sand or crushed aggregate complying with the requirements of BS 1200.
