Repairing window well blocks

I have an older home, circa 1957. The builder made window wells for the basement windows out of cinder blocks stacked & cemented on top of each other. The tops of some of the blocks has worn away and occasionally lets rain water get up over the worn/broken edges. I'd like to repair the tops of these blocks or at least just cover and level off the entire multi-block surface with cement or similar.
The blocks, being old, are a fairly dark gray color so I suppose I could go with a mix of portland cement / sand / gravel.
Any thoughts on the correct materials to use and ratios of those materials?
Thanks! Walt
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I'm assuming the blocks were set open side facing up?
Can you put caps on the existing blocks to both raise the top of the wall and protect the blocks from further damage?
Try a landscaping yard for different style caps, like these:
http://www.rcpblock.com/wallcaps.html
Mortar them in place.
If need be, you could build a form to hold the mortar in place if you need to build up sections to get it all level.
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An old formula for concrete is 1:2:3, easy to remember.
1 part Portland cement 2 part sand 3 parts gravel
Adjustments can be made according to the materials used and if it is a sand/gravel mix. Use stones small enough to work in the dimensions of the pour but large enough to be strong.
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