淤泥再生高强度轻质骨材开发

Development of Lightweight Sintered Aggregate in High-Strength High-Workability Lightweight Concrete from Recycled Sludge

目的利用水库淤泥,烧结再生高强度轻质骨材,取代混凝土配比中天然石材.方法试体经过X光绕射仪分析淤泥成分,并以阿太保限界理念进行试验取得最佳造粒含水量,经反复进行不同温度烧结,取得烧制高强度轻质骨材最适宜温度为1 150～1 200℃.结果笔者研发的轻质骨材的莫式硬度介于7～8,单颗粒的抗压强度为21.53～33.2 MPa,吸水率为0.5%.结论经反复测试,淤泥成分只要符合美国Riley所提范围内,均适合再制高质量轻质骨材,可取代日益稀少的天然骨材.

The purpose of this study was to manufacture high strength,lightweight aggregate from reservoir sludge for replacing the natural stones in concrete by using a sintering method of reproduction.An X-ray diffractometer was used to analyze the sludge content of the specimen.The Atterberg limits test was utilized to determine the optimal water content of granules.After sintering the specimen at different temperatures,researchers found that 1 150 ℃ ～1 200 ℃was the most appropriate range of sintering temperature for the production of high strength,lightweight aggregate.Results showed that the mineral hardness of the lightweight aggregate pro-duced by this study was approximately between 7 and 8 on the Mohs scale of mineral hardness.The compres-sive strength of a single particle was between 21.53 MPa to 33.2 MPa,and the absorption rate was 0.5%.After undergoing repeated tests,as long as the sludge content meets the standards set by Riley（US）,the sludge is appropriate for the reproduction of high strength,lightweight aggregate to replace increasingly scarce natural aggregate.