Hello, we have recently changed to type 1L cement and type c flyash. our finishers are having alot of issues with shrinkage cracking in first hours with the flyash mix. strait cement they do not. do youhave any suggestions?
We would recommend looking into initial and intermediate curing practices as described in ACI 308 Curing documentation. Wind breaks, monomolecular evaporation retarders, misting, and other methods can help reduce shrinkage cracking. In addition, some concrete fibers are also effective in reduction of plastic shrinkage cracking. Your ready mix concrete supplier should be able to share information on the particular fibers they carry.
Very interested if your type C fly ash is OK with ordinary portland cement? I don't know if there may be a shrinkage reaction between the calcium hydroxide of the type C and the calcium carbonate in 1L? Then try type F fly ash with 1L?
Hello, we have recently changed to type 1L cement and type c flyash. our finishers are having alot of issues with shrinkage cracking in first hours with the flyash mix. strait cement they do not. do youhave any suggestions?
We would recommend looking into initial and intermediate curing practices as described in ACI 308 Curing documentation. Wind breaks, monomolecular evaporation retarders, misting, and other methods can help reduce shrinkage cracking. In addition, some concrete fibers are also effective in reduction of plastic shrinkage cracking. Your ready mix concrete supplier should be able to share information on the particular fibers they carry.
Very interested if your type C fly ash is OK with ordinary portland cement? I don't know if there may be a shrinkage reaction between the calcium hydroxide of the type C and the calcium carbonate in 1L? Then try type F fly ash with 1L?