After trying to break up a heaved 4 inch thick concrete walkway set in wet soil using a sledge hammer, I concluded that working on the rock pile was a good punishment for misbehaving convicts - I also concluded that I deserved better. Purchasing this tool was a better solution.
I read all of the reviews of this, and similar demo hammers. Some of the feedback was obviously taken seriously, and a packaging engineer hired to ensure survival of the tool during shipping - mine arrived in excellent shape. That being said, the plastic bottle of gear oil leaked, and converted the lube into a messy corrosion protectant...a trip to the hardware store to purchase some gear oil and the oil reservoir was filled, and the tool was ready for work.
This isn't the all powerful, 150 lb pneumatic jack hammer that you see being used by construction workers, but it is very effective if used with some knowledge. The most useful bit of the two included, the pyramid bit, is essentially a 35# wedge, and is effective if used as follows: 1) Make sure the edge or corner that you are working has a "free" surface - when the wedge plunges into the concrete, the chunk you're breaking away will need somewhere to go - it won't easily push adjacent concrete, soil, etc. 2) Start on a corner if possible, and use the point to make some small, 1-inch deep impact holes (these are stress risers - they don't need to go completely through the slab) spaced 3-4 inches apart, making a semi-circle 8-12 inches from the corner. 3) For the final impact hole, angle the point slightly toward the edge of the slab, and keep going until the corner piece cracks off. 4) Repeat as necessary to break up the slab. 5) Do not use the tool for a pry bar to move or break chunks away - I haven't tried it, but it seems like a good way to break the cast aluminum housing - use a steel crow/wrecking bar instead.
If the slab is embedded in wet clay/soil, much of the energy being input into the slab will be absorbed the clay/soil. In this case, get a 5 foot pry bar (Home Depot, about $30-40), pry up the slab, and carefully slip a brick or piece of broken concrete under the slab so it is kept out of contact from the soil - it should break up more easily. Also make sure you're putting your weight into the tool so that the mass of the motor housing is increased and the bit is accelerated to a higher impact velocity. HAVE FUN !!!
(2 customers reviews)
Customers Rating=5.0 / 5.0
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