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A question for you concrete experts....
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<blockquote data-quote="Angus Cowman" data-source="post: 818286" data-attributes="member: 8829"><p>actually 3-4" of sand will do as much or better than the gravel </p><p> the gravel is placed so the ground can move under the concrete and act as a cushion so it doesn't Heave the concrete up </p><p> in most areas gravel is used because it is cheaper than sand </p><p> in some applications we HAD to use sand especially if we were close to solid rock or if the concrete was going to have uneven weight loads placed on it </p><p> such as being empty part of the time with no load and then being filled with a heavy load </p><p> if the sand is available I would use it you just need to water and pack the sand before placing the concrete on it </p><p> and also you will need to wet the sand pretty well right before you pour concrete on it so it doesn't suck the moisture away from the cocrete and make it harden to fast </p><p> some people will but plastic on top of the sand and under the concrete but I don't like doing it that away and we were never allowed to do it that way on the wtaer and sewer treatment facilities that I built</p></blockquote><p></p>
[QUOTE="Angus Cowman, post: 818286, member: 8829"] actually 3-4" of sand will do as much or better than the gravel the gravel is placed so the ground can move under the concrete and act as a cushion so it doesn't Heave the concrete up in most areas gravel is used because it is cheaper than sand in some applications we HAD to use sand especially if we were close to solid rock or if the concrete was going to have uneven weight loads placed on it such as being empty part of the time with no load and then being filled with a heavy load if the sand is available I would use it you just need to water and pack the sand before placing the concrete on it and also you will need to wet the sand pretty well right before you pour concrete on it so it doesn't suck the moisture away from the cocrete and make it harden to fast some people will but plastic on top of the sand and under the concrete but I don't like doing it that away and we were never allowed to do it that way on the wtaer and sewer treatment facilities that I built [/QUOTE]
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A question for you concrete experts....
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