11/9/2023 0 Comments Lime cement plaster![]() So the same system is being used for all sorts of different wall finishes to give it the appearance of stone. And then again also, this which has been on the same effect, a ruled line, the lines can be ruled either with just a groove or with a crown, in them or both, but this one has been on brick as we can see the shape of the brick. Again they were sapling and mud buildings but rather more sophisticated than the one I just showed you. So we find on this primitive building that being done but also on other buildings like this example here which is from a building in New South Wales. It was to imitate a masonry building and sometimes it had a coloured wash, sort of brown or creamy coloured wash to enhance that effect. So it's timbers saplings on the outside of the building running horizontally and then this on the face, a smooth facing which looks quite sophisticated when it's finished because it's been made totally smooth and ruled in lines to look like the joints in masonry, and that's the way lime is normally used. It's a very primitive building because you can see these are the remains of timber saplings. ![]() But at first you're creating a building in a material which would dissolve in the rain so you tend to have not much ornament on the face of the building and a good coat of paint to protect it. Now, later on, some natural cements were found which are rather stronger than lime, and have some capacity to resist water, say rain and so on, and then much later on, Portland Cement, which is the modern cement, was both imported from Britain and made in Australia and that sets underwater and has a very strong hydraulic capacities, can be used for harbour works and so on. This is mortar from another brick from Tasmania and the little bits of shell actually in the mortar and that show that this was burnt from shell lime in those early days. So in some of the early examples, we find this. Later on limestone was more commonly used and in some parts of Northern Australia coral was used, they all have the same process involved of using calcium carbonate (CaCO3) to get that lime. When Europeans settled in Australia lime was burnt locally, largely from shells from Aboriginal middens, the Aboriginals had left from their feasts whole piles of shells around the coast and they were used for lime. I'm now talking about limes, cement and plasters. Professor Lewis explains various interior and exterior concrete finishes.
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