Oh, ok. I was misunderstanding what you wanted to use it for. I belive you it is recomended that you don't use cement, as it can spall violently from thermal expansion. Basically the same as not using river rocks to build a fire ring.
If all you need is enough for a burner, Ace hardware sells quart sized buckets of furnace cement for under ten bucks that will work for what you want, I think.
BTW. I have to agree that the bentonite will degrade and crumble fairly quickly.
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"and the pikes were all broken or bent, and the powder was all of it spent. Then Sir Grenville cried, in his English pride.Sink me the ship Master gunner! Split her in twain, fall into the hands of God, not into the hands of spain!
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