Normal weight concrete is about 145 lb per cu.ft. That is wet weight. Concrete sold at home centers is dry weight so the yield will be less than one cu.ft. Straight sack concrete is generally easier than using flyash if you are creating at home.
If mixing materials by hand from bulk, the old 1,2,3 rule works well to give 3000 psi or greater. using one bucket or container of portland cement to 2 containers of sand to 3 containers of coarse aggregate. Of course if you need air entrainment or want to use a water reducing, set retarding admixture or super plasticizer you are better off using redi-mix concrete and ordering it. Air entrainment is not necessary in this climate if the bulk of concrete is in the ground. Scott KD5FBA Scott Medbury 16802 Aprilmont Drive Sugar Land, TX 77498-1941 [email protected] From: BVARC [mailto:[email protected]] On Behalf Of Mike Brannan via BVARC Sent: Friday, April 07, 2017 5:13 PM To: BRAZOS VALLEY AMATEUR RADIO CLUB Cc: Mike Brannan; [email protected]; Rick Hiller Subject: Re: [BVARC] Need Concrete/Hole work done for a light Tower Base?? Carefully check the sack yield. Normal weight concrete is roughly 145 lbs/cu ft. Use greater than 3000 psi strength concrete. Do not add excess water. Rod the stiff mix into place. Note the 2 x 2 x 2 should be measured at least 6 inches below grade and so all surfaces are against firm to stiff soil. That means you will need extra concrete to finish above grade. Sent from my iPhone On Apr 7, 2017, at 4:46 PM, Rick Hiller via BVARC <[email protected]> wrote: 8 cu ft X 90 lbs per = 720 lbs. 31 foot lever moving 720 lbs.....doesn't take much moment. Where's KG5KV when you need him? RH Sent from my i-Thingamajig On Apr 7, 2017, at 4:30 PM, Scott Medbury via BVARC <[email protected]> wrote: A sack of sackrete is less than 1 cubic foot. It weighs about 80 pounds and a cubic foot of concrete weighs from 90 to 96 pounds before water is added. Scott KD5FBA Sent from my Verizon 4G LTE Droid On Apr 7, 2017 2:04 PM, Gary Sitton via BVARC <[email protected]> wrote: Rick, ALM-31 is new product so I don't have the specs. yet, but it's extruded 6061-T6 Alum. and will weigh ~200 lbs. with the beam and rotator. I would not need or want to fold it over fully extended! My handy guy said he'll do it for $500: materials, hole, frame, re-bar and pour. Seems a bit high, but it's turn-key and he's very meticulous. I probably could save some money by having a less skilled person dig and prepare the square hole. Bell-bottoming is a great idea however! Attached is picture of my homebrew common mode coax choke for the beam. 73s, Gary Sitton, K5AMH [email protected] On 4/7/2017 12:59, Rick Hiller via BVARC wrote: Gary, I'm surprised that a crank up fold over only specifies 2x2x2. Yards maybe but not feet. Heck, Rohn 25 needs more than that. GL.....Rick W5RH Sent from my i-Thingamajig On Apr 7, 2017, at 12:46 PM, Bruce via BVARC <mailto:[email protected]> <[email protected]> wrote: might want a little extra redi mix in case you bell bottom the hole or come above the ground level. 73...bruce Sent from my iPhone On Apr 7, 2017, at 12:30 PM, Sam Neal via BVARC <mailto:[email protected]> <[email protected]> wrote: Hello, I'm too far and too old to assist. Just a pointer - if you buy sacks of readi-mix for your cement, each bag ( should be marked on the bag ) is one cubic foot. Eight bags should fill the 2X2X2 hole. A cubic yard would take 27 sacks at one cubic foot each. 73, Sam Neal N5AF ____________________________________________________________________ Tower guys: I'm seriously contemplating and soon buying a US Towers ALM-31, crank-up, fold-over tower for my Tex Hex beam which requires a 2' x 2' x 2' (about a cubic yard) of concrete base. Does anyone have a suggestion regarding someone to dig and fill the hole? I will have anchor bolt forms and all re-bar work done ahead of the dig/pour. I'm 77 and just had a double (yes!) hip joint replacement and can't really dig such a hole nice and square. Also, I have no concrete experience and you only get one chance at a good pour. _______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Message delivered to [email protected] _______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Message delivered to [email protected] _______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Message delivered to [email protected] _______________________________________________ BVARC mailing list [email protected] http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org Message delivered to [email protected]
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