| 摘要 |
<p>PURPOSE: Provided are concrete secondary products with high strength and saved production costs by mixing waste lime fly ash, blast furnace slag as binding materials with stone powder and sand as aggregates. CONSTITUTION: The concrete secondary products such as bricks, blocks and curbstone are produced by the following steps of: preparing binding materials by mixing 30-60wt.% of waste lime, 20-40wt.% of fly ash, 0-40wt.% of blast furnace slag, 10-40wt.% of cement, 0-5wt.% of stimulating agent such as Na2SO4 or NaOH, and optionally pigment and air entraining agent; adding 50-500wt.%(based on the total amount of binder) of stone powder and sand, being in a weight ratio of 3:7, as aggregates, and 23-50wt.%(based on the total amount of binder) of water; casting; curing at 60-85deg.C and 90% or more of relative humidity.</p> |
