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Actually, what you can do, is after making sure that you have a 2-3 inch base bed of sand (to keep the terrace level), place the slate (varied shapes I'm assuming) on the sand - making sure to tap with rubber mallet to get a good grip. Then mix sand with dried cement powder (not sure of ratio - probably half and half, just look on the bag) and broom into joints. Then hose down with a moderate amount of water, making sure not to wash the grout out. The powder cement mix will set in the joints.
Another thing you can do is, if your in a well shaded area and moderate traffic, is instead of jointing with concrete, just let soil fill in, and plant moss or some type of aromatic herb, and everytime you step, it will let out an aroma - like lavender, etc...
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