Limecrete is a different product to concrete with very different properties.
- it does not reflect heat from patio floors
- Is Limecrete any good?
- It prevents damp penetration,
- provides insulation,
- maintains breathability and provides a solid, durable floor, in character with the original building.
- it is slow setting
- it can bend
But it is an expensive option using materials that are tricky to work with, and not necessary as often as might be imagined.
From;https://www.lime.org.uk/community ADVANTAGES OF LIMECRETE VS CONCRETE
Tŷ-Mawr posted this on 2 Feb 2017
The Limecrete slab (having a more open pore structure on a molecular level than concrete) can also provide a buffer to moisture vapour.
The thickness of the slab (100mm) means that moisture vapour will not be transferred straight through the slab, but rather it is buffered in the lower half of the slab and the top of the slab should always stay dry.
The slab provides thermal mass resulting in increased efficiency of the UFH,
LABC approved Detail without the need for a DPM.
No Expansion Joints - Our research has suggested that the considerations applicable to cementitious concrete with regard to expansion joints are not applicable to lime-based concretes.
Hydraulic Lime generates little heat during the initial chemical hydraulic set and Limecrete has a good flexural strength to compressive strength ratio.
These properties mean that huge savings can be made in terms of the labour and equipment usually required to fabricate dowelled and induced contraction joints in cement concrete ground bearing slabs.
The flexural strength of Limecrete copes with movement normally found in solid wall building – reducing the risk of cracking.
I'm planning to make lime concrete for a walkway. I'm doing it from scratch. Currently building the kiln to make the lime from local limestone. Bagged lime is rarely used in this area so it may have calcined in the bag sitting in the warehouse. So I'm making my own slaked lime and mixing it with coal slag aggregate which is ferro-silicate glass ground up into a coarse sand consistency, and sharp granite gravel. The walkway should be more durable than the adjacent portland concrete walkway. Part of the new slab is going to be covered by pots full of culinary and medicinal herbs. The soil dug up from the slab location is going to become cob for building kilns. I'm building 2 kilns and a bread oven from cob.