Cast Roman Cement from 1840 on a building in Liverpool
Cast, run in situ and flat renders made from Roman Cement can be found throughout Liverpool in the first two thirds of the nineteenth century. For all our regular customers we offer on-site support and were pleased work through some of the issues faced by Dave Lawton from Specialist Plastering whilst he is trying to sensitively restore a number of large and grand terraced properties in Liverpool.
The pictures show some architectural decorative elements of cast from roman cement in the work shop and fitted on site. On one picture the timber laths, giving strength to the cast, can be seen exposed after paint stripping.
We are supplying prompt, from which roman cement mortars can be formed and lime renders to Dave to allow him to repair and restore the building that had later OPC cement applied in the more recent history that was damaging the fabric of the building.
Roman cements are natural, highly hydraulic binders, produced from marls – limestones containing clay. This natural combination of calcareous and argillaceous matter required only calcination – below the sintering temperature (800-1200°C) - and the grinding of the burnt stones to produce a binder of remarkable strength and durability. The success of the cement synthesis at low temperatures results from the natural intimate mixture of lime and clay (source of silica, alumina and iron oxide) in the marl, which could not be attained in any man-made mixture. The iron giving wonderful colours to traditional roman cement mortars.
Roman cements can be placed between hydraulic limes and Portland cements. They differ from hydraulic limes in that they do not contain free lime and therefore do not require slaking but rather grinding. They differ from the Portland cements by the different chemistry resulting from considerably lower temperature of calcinations.
They have fast setting times, after the addition of water, with minimal shrinkage. The development of strength in Roman cement mortars is particular: after rapid setting, the increase in strength is relatively slow.
Great that the press picked up on our work with the craftsmen in Barbados, and with local people
Great that the press picked up on our work with the craftsmen in Barbados, and with local people to …
On our last day in Barbados, it was good to see the vertical sliding sashes, made from Guyana Purple Heart wood, going back into frames within the Garrison House at Bridgetown. Tutors and students from the Samuel Jackman Prescod Institute of Technology, with a little support from Mark, copied adjacent windows to begin conservation work on this building.
On our last day in Barbados, it was good to see the vertical sliding sashes, made from Guyana Purple…
Mark was very pleased to help Grantley Adams Memorial School, and a voluntary group set up to bring a former slave hospital back into use, with an evening event to demonstrate the building’s potential to create a better future for all Bajans.
Mark was very pleased to help Grantley Adams Memorial School, and a voluntary group set up to bring …