... :1 Sodium lignin sulfonate water-reducing agent dosage is 0.20-0.30% of the cement, reducing the water rate is ... the reference concrete 3 days strength increased by 20%, 7 days increased 15-20% , 28 days increased by 15%, long-term strength has also ... urgent discharge and usage life. VI Usage method1 Mix 0.20-0.30% with cement,0.25% is recommend .2 Powder ...