On Beer and Urine and a Little Off-Topic

So there was an article on Yahoo News yesterday, which I finally got around to reading this morning, about how scientists think that they have discovered that the stones destined for the pyramids of Giza were moved because water was poured on the sand in front of them as they were hauled along, otherwise the sand would bunch up. (And for this bit of insight, they had to earn a PhD, first.)

Yeah, but water?  Water is a little hard to come by in the desert, even one that was a little wetter some 3500 years ago.

On the other hand, you know what was easier to come by? Beer and its byproduct, urine. Those ancient Egyptian construction workers drank lots of beer, and even went on strike because they objected to being denied their quota. The resulting urine was free, easily internally-transported by individuals until needed, and could be gathered into pots and urns and poured out at some designated place. And the thousands of Egyptian workers would produce an almost infinite amount of urine, all for free. (And we have already determined that free is good, even 3500 years ago.)

So my questions de jour are: What are the chemical effects of beer on urine; are the sands of the Egyptian desert different in chemical composition from the sands of, say, your average beach; what are the chemical effects of urine on the sands of the Egyptian desert; and would beer-laced urine, poured onto Egyptian sand, produce any chemical changes that would improve one's ability to pull heavy objects across said sand, as compared to water? If, for instance, the ammonia crystals in the urine reacts to the silicon or kaolin of the sand, does this result in a temporary binding of the crystals which makes for a smoother road, at least until the ammonia has thoroughly evaporated?  If so, this could solve the riddle that has plagued Egyptologists and other interested parties for ages.

So, one at a time.

1.     What are the chemical effects of beer on urine?

2.     Are the sands of the Egyptian desert different in chemical composition than other kinds of sand?

3.     What are the chemical effects of urine on the sands of the Egyptian desert?

4.     Would beer-laced urine, poured onto Egyptian sand, produce any chemical changes that would improve one's ability to pull heavy objects across it?

If anybody with knowledge of chemistry should happen to know the answers to these questions, I would be happy to hear from you in the comment section.