Slump test is for testing how much water is in the mix,lower the number equals less water.Slump is how much in inches the concrete goes down after the slump cone is packed and then removed. If you order 3500 you should get at least 3500 and that is if you keep it around a 4" slump,if you let the finisher put in enough water to raise it to a 6" slump then you won't have 3500 anymore as too much water kills the strength of concrete.The best way to pour concrete is use a Plasticizer you should get the concrete with a 3" slump then put in the plasticizer and it'll take the mix to about 7" slump for about 30-45 minutes time to get it off the truck and worked down then the concrete starts to go back to a 3" and you'll have a good strong slab.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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