Browse Forums Building Standards; Getting It Right! 1 Dec 23, 2013 7:01 pm This is what we need in Melbourne's west - concrete that seals its own cracks! According to this radio program the Romans had self-healing concrete and material scientists are now experimenting with bacteria to help modern day concrete heal itself. Here is the link for anybody who is interested: http://www.abc.net.au/radionational/pro ... gs/5152856 Re: Self-healing concrete 3Jan 10, 2014 3:53 pm 'Self healing' works to seal cracks which occur shortly after construction where not much further cracking occurs. With clay soils further movement can occur. The other issue is that both applications Matt mentioned are built with enough steel to ensure that minimal cracking will occur. It is generally considered uneconomic to use this amount of steel in a slab. The self healing only seals the concrete and doesn't actually increase the tensile strength of the concrete. As a footnote the reason Roman Concrete was 'self healing' because there was 'Free' lime in the cement. With modern cements there is no 'Free' Lime, but the concrete is stronger, and more consistent. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Hi guys, I want to do some floor levelling before laying the planks and am considering doing it with self-levelling or yellow tongue PB board. I am wondering which one… 0 6529 To my understanding early saw cuts are to control shrinkage cracks, so doing them now would be pointless. Control joints may reduce ugly cracking during periods of soil… 3 9830 |