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Posted: Tue Aug 14, 2012 11:30 am
by ringi
I am about to order MOT 1 and “all in one� as well as grit sand. Having less different aggregates will reduce waste and save space. I will be concreting in paving stones on edge as well as a few ducts – so nothing that needs the best grade concrete.
So I had the thought, “Can concrete be made with MOT?�
Posted: Tue Aug 14, 2012 11:53 am
by Carberry
Brucieboy will tell give you the full scientific answer but yes you can. As far as I know it isn't quite as strong and it is more difficult to level because of the bigger chunks of stone but for what you would use it for it shouldn't be a problem.
Posted: Tue Aug 14, 2012 12:25 pm
by Brucieboy
Ringi - technically, you can make concrete with MOT Type 1 providing it's essentially a pure hardstone such limestone or granite. Beware of material with any recycled element in it. However, as Carberry says, it will be very "lumpy" as it contains a proportion of aggregate between 31.5mm and 63mm which is quite large. Although there are specified limits for each sieve size, the grading can vary quite a bit. Personally, it's best to stick with conventional coarse and fine aggregate, such as 20mm gravel/limestone/granite and sharp sand. However, it's your choice.
Posted: Tue Aug 14, 2012 12:48 pm
by Pablo
I use mot and blinding for small quantities of concrete all the time but only for sub surface stuff like trench mix backfill and it's great for fencing because you can compact is well and it's held enough to fix rails to. It's useless for anything above ground and can be prone to frost.
Posted: Tue Aug 14, 2012 7:50 pm
by r896neo
Its also a bollox to keep the mixer clean while doing it. You end up nearly washing it between gauges.
Posted: Tue Aug 14, 2012 7:55 pm
by bobbi o
we use whin dust (6mm > dust) for pretty much everything these days,as its half the price of building sand and work great for our needs.
Posted: Tue Aug 14, 2012 8:19 pm
by Pablo
r896neo wrote:Its also a bollox to keep the mixer clean while doing it. You end up nearly washing it between gauges.
Yeah I forgot about that :laugh: