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In a variety of materials, you have two different things happening on two separate tracks. Drying, reducer (e.g. Water) evaporating, soaking into the substrate or being consumed by curing, and Curing, the chemical reaction turning it from materials X and Y, into material Z. Wetness of concrete does need to be carefully managed during the curing process, ...


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One thing to consider is that concrete doesn't really "dry" like mud. The water is part of a chemical reaction that hardens the mixture over time. Once the concrete starts to get thick and lumpy, that chemical reaction is well under way. Adding more water and mixing will possibly make it smooth again, but all those bonds that have started to form will be ...


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Depends on what it will be used for as the reaction has already started. If it is for fence posts it will be fine, if it is for a smooth drive then not.


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You could fill the gap with gravel and then just cement over it. This will be less durable than properly mixed concrete, but probably hold up better than just filling it up with cement on its own.


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Portland cement mixed alone (called "slurry") will result in a brittle and soft compound. It may fill the void you're seeking to eliminate, but not with ideal results. It may break up and wear away faster than actual concrete. A 6" channel is more than "just a gap". It's a substantial structure in the end. I wouldn't pour less than 3" thick for strength or ...


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