What exactly is cement, anyway?" Primarily it is a mix of silicon dioxide and calcium oxide, with a small proportion of aluminium oxide. What comes as...part of the rock dust out of the tunnel is, we think, mostly calcium silicates and aluminium silicates and some other additives that may not be important, so that it needs heat treatment to convert it to oxides. We have not had the chance to examine enough samples to get a consistent result."John pounced. "Well, why don't you put in an order to. So far, I have encountered temperatures exceeding 1,650 ?C as I re-enteredthe atmosphere. The ceramic tiles that made up the Orbiter's heat shieldglowed red hot from the friction, but didn't even phase my body or thesuit I was wearing. Now, wearing only a thin turtle neck and a pair ofblack lycra pants, I stood on the balcony in my bare feet without worry offreezing. I thought to myself just what limitations this body had, andwhat it's full potential was.It was then that I remembered that. More

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