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A question for you concrete experts....
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<blockquote data-quote="Angus Cowman" data-source="post: 818558" data-attributes="member: 8829"><p>Nova </p><p> as for the sand washing away if you knew how he was building this there is No where for the sand to run as it is a bunker type silo with the concrete extending to the earthen walls and the ends will have access ramps built to the top of the concrete on the ends so there will be no erosion issues </p><p> you may have a degree in engineering but from real world experience the plastic is a joke and causes more problems than it eliminates </p><p> as for the sand ANYTIME we were anywhere near solid rock we had to add sand as a cushion for the rock to move without moving the concrete so your comment about being able to pour on granite kinda surprises me as the only time we were never allowed to pour directly on solid rock and always had to install a cushion </p><p> from talking to WW a footing is not required or needed except on the ends where he is entering and exiting the edges of the slab the edges will have minimal load on it since there is not going to be any walls poured on top of the slab as he is using the existing earth for the side walls </p><p> </p><p>and yes I have installed the prefabbed or as they are called Prestressed concrete slabs for alot of buildings and parking garages they are engineered entirely different than poured in place concrete and the also have tension plates and cables running thru them to help carry the load and are nowhere comparable to PIP concrete buildings in the way they are engineered they are also poured on beds that are heated and cooled so the concrete will set and cure at the exact times and temperatures </p><p></p><p> as for the moisture content on fill material we were always controlled by moisture spec for certain types of material most clay based materials optimium was around 18% if memory serves me correctly </p><p> I am not trying to disagree with you but just because a set of engineering plans says it has to be doesn't neccesarily hold true on every situation without a little more knowledge of exactly what is being done and what the purpose is</p></blockquote><p></p>
[QUOTE="Angus Cowman, post: 818558, member: 8829"] Nova as for the sand washing away if you knew how he was building this there is No where for the sand to run as it is a bunker type silo with the concrete extending to the earthen walls and the ends will have access ramps built to the top of the concrete on the ends so there will be no erosion issues you may have a degree in engineering but from real world experience the plastic is a joke and causes more problems than it eliminates as for the sand ANYTIME we were anywhere near solid rock we had to add sand as a cushion for the rock to move without moving the concrete so your comment about being able to pour on granite kinda surprises me as the only time we were never allowed to pour directly on solid rock and always had to install a cushion from talking to WW a footing is not required or needed except on the ends where he is entering and exiting the edges of the slab the edges will have minimal load on it since there is not going to be any walls poured on top of the slab as he is using the existing earth for the side walls and yes I have installed the prefabbed or as they are called Prestressed concrete slabs for alot of buildings and parking garages they are engineered entirely different than poured in place concrete and the also have tension plates and cables running thru them to help carry the load and are nowhere comparable to PIP concrete buildings in the way they are engineered they are also poured on beds that are heated and cooled so the concrete will set and cure at the exact times and temperatures as for the moisture content on fill material we were always controlled by moisture spec for certain types of material most clay based materials optimium was around 18% if memory serves me correctly I am not trying to disagree with you but just because a set of engineering plans says it has to be doesn't neccesarily hold true on every situation without a little more knowledge of exactly what is being done and what the purpose is [/QUOTE]
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