[TowerTalk] Guy post

[VAN FAIR]

I am currently using 3"OD steel pipe for my above ground guys for a Rohn 25 tower.  The post are 9 feet with 5 feet above hard ground set in concrete.  I want to fill the post with concrete and one long rebar to strengthen them against bending. Would concrete with gravel or just cement with sand be better inside the pipes? I do not live in a high wind area. Thanks for your help. Van