Natural Roman Cement 20kg delivered on half pallet.
Description: In 1796 the Reverend James Parker Patented Roman Cement and it became highly desirable for its long term durability.
After 1824 Roman cement declined due to the introduction of Portland cement which in the present day, as an Ordinary Portland Cement (OPC), is burnt at fusion temperatures and can have some undesirable effects on historic buildings. Natural Roman Cement (NRC) is now available to blend with hydrated limes for a reliable set. NRC has a better compatible strength with historic masonry and renders due to the special processing of the gault stone and the lower kiln temperatures used.
NRC is suitable for conservation and new build projects where characteristics such as breathability, flexibility and colour are important.
NRC can be blended with up to 2 parts lime; when mixed with the right aggregate it will produce a more flexible material with a vapour open quality which is similar to air lime.
NRC has a unique buff colour which, unlike other cements, does not produce any grey tones.
NRC is unique because it is cement without mineral or chemical additives to control the speed of set.
Please note bags are dated with manufacture date. It is known that NRC has a considerably longer shelf life than other cements.
Typical blends: NRC-lime-well graded sharp aggregate 2-1-9 1-1-6 1-2-7 1 NRC: 2.5 sand
Other blends: Seek advice from Technical to check the suitability of NRC before specifying. Workable life of fresh mortar 60 minutes variable according to temperature.
Vapour open qualities are determined by both aggregate and binder combination, seek advice from RCP Ltd Technical. Below values according to BS EN 1015-19:1999
28 day flexural strength 1.58 MPa
28 day compressive strength 3.09 MPa
28 day water absorption coeff 7.70 kg/m2/hr0.5
28 day water vapour permeability 0.96E-11, kg·m-1·s-1·Pa-1
Store in a dry area and do not use in extremes of temperature Natural Roman Cement , NRC and Rocem (TM) are trading names of Roman Construction Products Ltd. Xi Irritant Risk Phrases R36/37/38 Irritating to eyes, respiratory system and skin R66 Repeated exposure may cause skin dryness or cracking R43 May cause sensitisation by skin contact Safety phrases S22 Do not breathe dust S26 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S24/25 Avoid contact with skin and eyes S36 Wear suitable protective clothing Note 1: Contains salts at a rate of 6 parts per thousand Note 2: Soft cement lumps in the bag are a natural feature of this product and will not affect its performance.
Please see the technical and safety data here