Mot1 & dust

Paul Miller · Post: # 62798Post **Paul Miller** Sat Apr 30, 2011 11:21 am

I'm putting the sub-base down in 2 layers and wacking each time. However, the amount of dust that came up doing the first layer was unbelievable. Seems to have got everywhere into the house. I even had to wash the neighbour's car as it looked like half of the Sahara Desert had been dumped on it.

Before I wack the 2nd layer, can I hose it down to surpress the dust or will that have an adverse effect on the compaction?

Cheers

Paul

Sat Apr 30, 2011 11:36 am

You can damp it down with a mist to supress dust, don't soak it but damp it down,

They do this on road building with big tractor drawn sprayers

Hawk · Post: # 62802Post **Hawk** Sat Apr 30, 2011 11:53 am

it will compact better with an element of moister in it

Post: # 62841Post **Tony McC** Sun May 01, 2011 11:11 am

There is a moisture tolerance for Type 1 and if it is delivered to site bone dry or sopping wet, it is out of tolerance and can be sent back to the supplier as unfit for purpose.

The required moisture content is 8-13% by weight. The problem is that you need some fancy lab kit to determine the moisture content.

Post: # 62863Post **Dave_L** Sun May 01, 2011 8:49 pm

I guess you could pee on it if it were a little on the dry-side

Mon May 02, 2011 9:13 am

we rented a HD wacker the other day (87kg) and it had some kind of water attachment thing on it
not sure how it worked as we didn't need it
however if the MOT is that dry we normally just mist it with the hose as we wack it
LLL