The water reducing agent of cement was prepared via sulfonation of semi-chemical pulping black liquor.

There is little effect for the soluble alkali content in cement paste when the dosage of aminosulphonate based superplasticizer is greater than its saturated amount.

Under the conditions of higher water-cement radio, a certain consistency FDN high-range water reducer and hermetic surrounding, the cement paste did not set in a long time.