Browse Forums Landscape & Garden Design Re: Foundation for tasman block retaining wall 7Apr 06, 2015 5:40 pm si618 Could I ask what ratio of road base to concrete powder you used? Approximate amounts is fine. Answering my own question again was recommended ~1 to 4 or 5 mix by the landscape suppliers, and from ~1 tonne of road base/quarry rubble I mixed in around 240kg of cement powder, so just over 1 to 4. Used a watering can to lightly dampen each layer, then mixed the rubble and cement using the back of a fire rake before tamping down. Quartz sand is definitely easier to level, but the rubble/cement mix looks very solid. On this 12m wall, 80kg of quickset concrete was used to help embed the first layer of blocks, as I had left a ~50-75mm offset between the front of the block and the ground. First layer of blocks were a minimum ½ their height under ground level, although due to the sloping land, some ended up being completely covered. One mistake I made was not allowing for the 30mm batter the boral gardenwall blocks have as the ground height changed, as each level overlaps the previous, so you lose 30mm for each step up. End result was in a few spots I had to scrape away extra soil to leave adequate room for drainage (blue metal). there is a standard besser block wall pdf somewhere online with footing sizes, also have a look at dincel. 1 2926 Thank you again Simeon.. I will call my certifier for that. Have a good day 4 5197 Thanks for the insights, that makes perfect sense, and yeah, I will be leaning on the experience of the excavator operator entirely. 6 16159 |