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Farm Building and Infrastructure
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Concrete Foundation Shuttering
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<blockquote data-quote="mar" data-source="post: 3652014" data-attributes="member: 9032"><p>it all depends on the angle of repose, the lower the slump the less pressure, the higher the slump, more pressure <a href="https://en.wikipedia.org/wiki/Angle_of_repose" target="_blank">https://en.wikipedia.org/wiki/Angle_of_repose</a></p><p></p><p>A wall 10m thick by 1200 high will exert a lot more pressure on the shutters than a wall 200mm thick by 1200 high.</p><p></p><p>The pressure on road forms in a 6 inch slab at 40ft wide is likely going to be the same as a slab 4ft wide.</p><p></p><p>Imagine you had a slab 40ft wide and 6 inch deep, pour the concrete, level it of and remove the road form immediately and the side will fall away, the whole 40ft isn't going to just collapse, just a strip around the edge</p><p></p><p>Repeat the same on the 4ft wide slab and the same width will collapse, it is only the bit that has collapsed that is exerting the pressure</p><p></p><p><a href="http://www.google.ie/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiP2t-Qy_vSAhVBDMAKHUAUALYQjRwIBw&url=http%3A%2F%2Fwww.learncivilengineering.com%2Flateral-earth-pressure%2F&psig=AFQjCNFPwUYTsSsARw8cdrpFmADuTJ0LHA&ust=1490871546135392" target="_blank"><img src="http://www.learncivilengineering.com/wp-content/uploads/2014/11/Capture1-300x125.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p></blockquote><p></p>
[QUOTE="mar, post: 3652014, member: 9032"] it all depends on the angle of repose, the lower the slump the less pressure, the higher the slump, more pressure [URL]https://en.wikipedia.org/wiki/Angle_of_repose[/URL] A wall 10m thick by 1200 high will exert a lot more pressure on the shutters than a wall 200mm thick by 1200 high. The pressure on road forms in a 6 inch slab at 40ft wide is likely going to be the same as a slab 4ft wide. Imagine you had a slab 40ft wide and 6 inch deep, pour the concrete, level it of and remove the road form immediately and the side will fall away, the whole 40ft isn't going to just collapse, just a strip around the edge Repeat the same on the 4ft wide slab and the same width will collapse, it is only the bit that has collapsed that is exerting the pressure [URL='http://www.google.ie/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiP2t-Qy_vSAhVBDMAKHUAUALYQjRwIBw&url=http%3A%2F%2Fwww.learncivilengineering.com%2Flateral-earth-pressure%2F&psig=AFQjCNFPwUYTsSsARw8cdrpFmADuTJ0LHA&ust=1490871546135392'][IMG]http://www.learncivilengineering.com/wp-content/uploads/2014/11/Capture1-300x125.jpg[/IMG][/URL] [/QUOTE]
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