Limestone Powder in Concrete 1
Posted by William (Ronnie) from Olmsted L&D, IL, US on January 23, 2007
I\\\’m working with a tremie concrete mix that has 252 lbs. of limestone powder in it. The mix also has Cement, GGBFS, Fly Ash \\\”F\\\” and silica fume. The specification I\\\’m working with has a max w/c of 0.38. My problem is I can not count the weight of the limestone powder in working the w/c and the limestome powder has a big demand for water. Do you know a publication where limestone powder can be counted as cementitious? I have 35 years with USACE, this is a first for me.
Ronnie:
You are working with a water repellent mix no doubt; utilizing the silica and the limestone for density and for placement flowability at a low w/c ratio.
I think that as far as the w/c ratio goes the limestone would count under a total cementitious value...what do the aci offer? concrete.org
Otherwise I might offer a pre-mix paste of limestone powder and water being added to the pre-mixer...offered to your specifier as an additive/admix product that can be dosed by its own unit weight?
Please let me know what you actually find--I'm not sure on this either...
Regards,
Robert
