With adding fly ash, the TDC of cement paste or mortar is decreased obviously.When the amount of fly ash exceeds 30%, the TDC of cement mortar has a little change.

• 粉煤灰能显著降低水泥浆体的线膨胀系数，当粉煤灰掺量达到30%25以上时，掺粉煤灰水泥砂浆的线膨胀系数差别不大；