Ready-mix Concrete bleeding problem

our colleagues find the market superplasticizers quality is not stable ,somes have the bleeding problem ,

the above pictures is about 20mints conditions compare .

the other Ways to try reduce bleeding in concrete include  :

• Reduce water content. Use lower slump mix

• Use finer cements

• Increase amount of fines in the sand

• Use supplementary cementitious materials

• Use air entraining admixtures