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<blockquote data-quote="Kurtr" data-source="post: 267606" data-attributes="member: 194"><p>Since this is is my job.&nbsp; If you are getting your redi mix from a good company the shale will not be that much of an issue as there are specs that keep it from being allowed in there.&nbsp; Of more concern would be the sand with has a reaction with the cement it’s self but we have one of the best sources of fly ash at fallkirk mine to mitigate that problem.That is added at 25% in summer months a little less in colder months as the fly ash can retard the set of the concrete but does help with the workability.&nbsp; So now if you are really worried about the small amount of shale or more absorbent rock in exterior concrete or finished floors we use quarry rock east side of state generally granite west side lime stone I like granite better my self.&nbsp; It is either railed in or trucked in.&nbsp; Now air content slump and the guy doing the work all have huge affects on finished product.&nbsp; Most mixes are designed at a 4” slump for a given psi well then you get a contractor that wants to have it way wetter you now take your water to cement ratio down air content spikes top of the concrete peels off in a year and the supplier is blamed when it is actually bad work practice.&nbsp; Salt is the worst thing ever for concrete period.&nbsp; You want it to last seal it and it will ad years of service caulking saw cuts will also help. The days of firing some pit run ,cement and water to make concrete are long gone.&nbsp; Two things are guaranteed in life death and concrete will crack.</p></blockquote><p></p>

[QUOTE="Kurtr, post: 267606, member: 194"] Since this is is my job. If you are getting your redi mix from a good company the shale will not be that much of an issue as there are specs that keep it from being allowed in there. Of more concern would be the sand with has a reaction with the cement it’s self but we have one of the best sources of fly ash at fallkirk mine to mitigate that problem.That is added at 25% in summer months a little less in colder months as the fly ash can retard the set of the concrete but does help with the workability. So now if you are really worried about the small amount of shale or more absorbent rock in exterior concrete or finished floors we use quarry rock east side of state generally granite west side lime stone I like granite better my self. It is either railed in or trucked in. Now air content slump and the guy doing the work all have huge affects on finished product. Most mixes are designed at a 4” slump for a given psi well then you get a contractor that wants to have it way wetter you now take your water to cement ratio down air content spikes top of the concrete peels off in a year and the supplier is blamed when it is actually bad work practice. Salt is the worst thing ever for concrete period. You want it to last seal it and it will ad years of service caulking saw cuts will also help. The days of firing some pit run ,cement and water to make concrete are long gone. Two things are guaranteed in life death and concrete will crack. [/QUOTE]

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