Max time for mix
Max time for mix
(OP)
Hi all,
Does anyone know what is the code maximum time between the introduction of mixing water to the cement and aggregate and completion of discharge is? Thank you in advance.
Jan
Does anyone know what is the code maximum time between the introduction of mixing water to the cement and aggregate and completion of discharge is? Thank you in advance.
Jan





RE: Max time for mix
RE: Max time for mix
Keep in mind the ambient conditions might well dictate a shorter time period, but longer than 90 minutes is certainly not recommended as you are flirting with the initial set time of the cement.
RE: Max time for mix
Some state specifications for bridge decks allow only 60 minutes with a continuous discharge of 45 minutes.
RE: Max time for mix
But you should specify more whether the concrete used contains additives such as retarder and/or superplasticizer reatrder. In this case you should test the compliance of admixture and permissible time for final and initial setting time of concrete with control mix. In addition you may perform trial mixes on site to check whether the addition of admixture affect or delay the setting time of concrete.