When keeping the constant W/B ratio and the content of cement pastes, superplasticizers can increase free shrinkage of mortars, but CLS can slightly decrease free shrinkage of mortars.

• 掺高效减水剂增大了砂浆的自由收缩值，且萘系比聚羧酸类减水剂更会增大砂浆自由收缩值，而掺木质素系减水剂能稍微降低砂浆自由收缩值。