Yo spence- Basswipes got it right. i would recomend going to a taylor rental and tell them you need a hand held wetsaw in the 10 inch blade ballpark (like the circular saw above- a diamond blade will work the best.
Spence I used to cut cement for a living....when they do road work they often cut the asphault before they dig a trench or hole...they use a saw that you push much like a lawnmower. The blade is a diamond tipped blade and is cooled with water.....tell the rental company you want a "wetsaw" with a blade big enough to cut what you want...probably you will need a 10 inch blade......provided you get this type of saw, you snap a chaulk line on your cut and you make several small passes each approximately 2 inches deep....this way your cut will not wander. Do it right and it will be clean and lazerbeam straight! Let me know how you make out.
The one driveway I helped pull up was done with a jack hammer and big metal leverage bar(cause they were availbale for free). Cut out a square and pop it up with the bar.
I worked for Taylor Rental for 4 years.......you need a walk behind wet saw....just what BF used.....have to rent the saw, and they will measure the blade before and after you use it and then charge you for how much blade you used. If used correctly, you cannot get a straighter cut IMO.
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