tag:blogger.com,1999:blog-7526903262584889386.comments2022-02-26T05:32:34.680-05:00Mastering Pervious ConcreteDale Fisherhttp://www.blogger.com/profile/14484989329211945911noreply@blogger.comBlogger12125tag:blogger.com,1999:blog-7526903262584889386.post-90377043462675451152013-01-04T00:19:02.018-05:002013-01-04T00:19:02.018-05:00This comment has been removed by the author.Anonymoushttps://www.blogger.com/profile/11845370767364640091noreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-19029550267647814642012-05-17T03:21:42.731-04:002012-05-17T03:21:42.731-04:00Yahooo...Looks great Dale!Yahooo...Looks great Dale!David Liguorihttp://bayareaperviousconcrete.comnoreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-9431654198909989062011-10-20T11:24:29.618-04:002011-10-20T11:24:29.618-04:002 More on Pervious Concrete
http://wrinkledman.bl...2 More on Pervious Concrete<br /><br />http://wrinkledman.blogspot.com/2011/10/its-25-nothing.html<br /><br />http://wrinkledman.blogspot.com/2011/10/poet-laureate-at-roast.htmlwrinkledmanhttps://www.blogger.com/profile/13277962566188964360noreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-75321555073463272442011-03-25T20:27:17.084-04:002011-03-25T20:27:17.084-04:00We are using the PERC fabric beneath about 2500 SF...We are using the PERC fabric beneath about 2500 SF of pervious concrete walkways cast in the Auburn University Arboretum in East Central Alabama. The red clays here don't readily infiltrate water. I'm anxious to see how our pavements behave with this new fabric.Michael Heinhttps://www.blogger.com/profile/01636464920378852714noreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-15892454512260437622010-12-23T09:20:37.938-05:002010-12-23T09:20:37.938-05:00Thanks Dale for advancing the practice of service ...Thanks Dale for advancing the practice of service learning using pervious concrete. Students at Auburn are excited about competing in this unique competition.Michael Heinhttps://www.blogger.com/profile/01636464920378852714noreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-31076456788896608262010-11-13T16:17:10.175-05:002010-11-13T16:17:10.175-05:00Dale,
Regarding color, in an attempt to achieve a...Dale,<br /><br />Regarding color, in an attempt to achieve a deeper more vivid color I recently tried using 1.25x the normal colorant. I too however, did not find it to be effective. Next week I'll be trying the Bean/ jelly bean color sprayed on, pre-plastic, and then if needed, post plastic too.<br /><br />In your reference to a sprayed color cure are you referring to the bean, or something else?davidhttp://bayareaperviousconcrete.comnoreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-32406484701574701612010-09-28T23:44:52.047-04:002010-09-28T23:44:52.047-04:00We always use heavy amounts of fibers in our pervi...We always use heavy amounts of fibers in our pervious concrete, usually some cocktail of PVA fibers &/or fibrillated polypropylene. We pour our concrete for residential applications on the thinner side, usually about 4" for driveways & about 3" for sidewalks & patios. But we also cover ourselves by using plenty of control joints. Either way, never noticed any cracking in our pervious concrete, except one time, in one little area where the base material changed underneath. <br /><br />Fibers generally don't make a difference for compressive or even flexural strengths, so I see why they aren't given more attention. It is hard to test for their effectiveness. But I am pretty sure they are effective, if for no other reason than witnessing pervious concrete specimens failing under compression. I am constantly tinkering with mix designs and have tested the compressive strength of thousands of pervious concrete cubes. There is a marked difference in the way cubes fail that have fibers, they hold together & maintain strength for some time after failure.Ryanhttp://www.earthcareland.comnoreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-76506894593225111322010-09-28T23:29:58.668-04:002010-09-28T23:29:58.668-04:00You should be able to add a vma to the truck &...You should be able to add a vma to the truck & mix it for awhile to thicken/ dry it up.Ryanhttp://www.earthcareland.comnoreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-33190139563258541592010-09-21T14:09:23.905-04:002010-09-21T14:09:23.905-04:00YES! Good observation. It would feel very heavy a...YES! Good observation. It would feel very heavy and have very little flow (typical of "dry" mixes), yet it would have a "wet sticky paste"Dale Fisherhttps://www.blogger.com/profile/14484989329211945911noreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-30701636539666458802010-09-20T19:36:33.497-04:002010-09-20T19:36:33.497-04:00Dale,
Thanks for the explanation. I mistakenly re...Dale,<br /><br />Thanks for the explanation. I mistakenly read it as the sand being in addition to the course aggregate, not in place of. Yes, I can see how that would decrease the yield.<br /><br />Question; as the added sand became part of the paste and filled the voids it would start to seal and give the same appearance as an overly wet mix. But, at the same time I would expect it to be, and act like, a heavy dry mix. True?Davidhttp://bayareaperviousconcrete.comnoreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-85672663193996675992010-09-10T10:54:43.104-04:002010-09-10T10:54:43.104-04:00Thanks David!
Actually, the total past volume is ...Thanks David!<br /><br />Actually, the total past volume is 5.74 CF, or 22% (assuming the cement SG is 3.1 and paste air is .0) leaving 19% voids (yes, probably less with admixtures, but we don’t need to be that detailed). <br /><br />I’ve changed the post with the corrections and I’ll let the Challenge run for extra time. <br /><br />DaleDale Fisherhttps://www.blogger.com/profile/14484989329211945911noreply@blogger.comtag:blogger.com,1999:blog-7526903262584889386.post-49378514847892839362010-09-07T03:37:10.090-04:002010-09-07T03:37:10.090-04:00If I may, I believe you have made an error in your...If I may, I believe you have made an error in your calculations. 600pds of cement equals 11.234% volume (of a yard)and 21 gal of water equals 10.0748% for a total of 21.39% volume paste, not 17% as you state.<br /><br />Based on the aggregate SG of 2.70 at 2,700 pds, the void content of the agg is 40.7%. Subtract the paste (21.39) for a final void content of 19.31%. (Actually probably slightly less with the admix's).<br /><br />Adding 135 pds (per/yd) of sand (at an assumed SG of 2.70) adds an additional 2.966% of volume bring the void content down to 16.344%. <br /><br />Given my understanding that as the void content approaches 15% there is a rapid reduction in the interconnectedness of the voids, I would conclude that this mix with the addition of the sand would likely not perform as designed. Since however this is not one of the choices my next best response is that the the mix will appear dry.Davidhttp://bayareaperviousconcrete.comnoreply@blogger.com