While this may be true, the realization that hollow concrete block is being misused here, should take precedence.
A light tractor, a small car, or what have you... if you are going to support the weight of same, CMU is a very poor choice of material and you put yourself at risk by doing so, every time, whether it crumbles and falls or whether you get away with it. And sure we have all done this, there is no doubt, however the practice is highly unsafe for the reasons mentioned. Now, say I had some certified 5000 psi CMU, 75% filled cells orientated vertically, a small tractor like this A-C or similar, probably won't crumble them, as it would take more than 5000 psi in compression to do so, the tractor itself does not weigh that much. However, you could crumble one of these with a heavier load, or if it has been compromised unknown to the user. Compare that to what you see in the video, Lanse is using an unknown CMU material, cells are horizontal, and the weight, is at least 1000 lbs + or - is placed onto the CMU, this is definitely unsafe.
Now here is another thing to toss in, realize that 3-4 courses high, just loosely stacked, if those top CMU's fall on you by themselves, it can and will break your legs, I have seen that first hand, both legs broke, compound fracture on one, 3 courses high stood on ends with boards for shelving, person grabbed onto the top one after stumbling, it fell across both legs, fractured same. It started by the improper use of this material, hard to believe that one of these, from 3'-0" to 4'-0" high can cause an injury like that. A different situation, but something many would not even consider.
Typical scenario with CMU:
People find new, used or old concrete block, then make use of a material they know nothing of or are certain about, like the strengths, physical properties, and or the safe use of same, as designed, as well as whether it has been compromised or not to support a substantial and often times unknown load, one that is also a work area, while it is supported.
You are at serious risk when working near an improperly supported tractor, car or piece of equipment, it's that simple, whether you get away with it or not, hollow concrete block is a very unsafe choice of materials to use for this purpose, principal or not, even with a light load, it's a practice to condemn, why take chances ? But..... like I said each to their own.....people will do what they want no matter what you tell em anyway...
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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