| 摘要 |
<p>PURPOSE: Provided are shrinkage reducing admixtures containing fly ash as a main material for reduction of concrete shrinkage cracks, and increase of long-term strength and durability. CONSTITUTION: The shrinkage reducing admixtures contain 30-80wt.% of fly ash, 2-5wt.% of anhydrous gypsum, waste gypsum from fuel gas desulphurization, 8-20wt.% of limestone, and 10-60wt.% of blast furnace slag. The concrete composition contains a mixture of 10-99wt.% of cement and 1-40wt.% of prepared admixtures, and aggregate in a ratio of 1:3 - 1:5, wherein air-entraining agent, water-reducing agent and thickener are optionally added.</p> |
