The higher cracking resistance of the concrete added with fly-ash or GGBS is due to the lower elastic modulus and the better creep stress relaxation capability of concretes at early ages.

• 而掺矿渣粉或粉煤灰混凝土早期抗裂性改善的主要原因在于混凝土早期弹性模量减小、徐变和松弛能力提高。