关键词: 疏浚底泥;免烧裹壳骨料;裹壳工艺;核壳结构

Abstract: Dredged sediments unburned aggregate , which utilized the Taihu Lake dredged sediments as raw material were manufactured in an unburned process .The effect of different and different core shell mass ratio on the properties of aggregate was discussed through the process of rolling time and shell thickness, especially single strength, compressive strength, water absorption and frost resistance .The study results indicated that the size distribution and the bulk density of shell aggregate are basically the same in comparison with the aggregate prepared by different wrapping times .In terms of strength, the single strength of the shell rolling time of 35 min is 2.47 MPa, which is 243％ higher than the aggregate of 15 min, and the compressive strength can reach 7.06 MPa.Comparing the aggregate of different core shell mass ratio, it was found that the single strength of 5:7was 2.78 MPa and the compressive strength was 7.58 MPa.In terms of the frost resistance, the aggregate loss rate of 5:7 was only 1.99％ after 20 freezing-thawing cycles.In comparison, the rolling time is 35 min, the core shell mass ratio is 5:7, and the aggregate performance is better, respectively, bulk density 820 kg/m 3 , single strength 2.78 MPa, compressive strength 7.58 MPa, water absorption rate 5.81％, and 20 times freeze-thaw cycle quality loss rate was 1.99％.

Key words: dredged sediment;baking-free shell aggregate;shell modification;core-shell structure