摘要
为使航道疏浚砂制备新型无粗骨料细粒混凝土替代普通混凝土,对比分析了石灰石粉和粉煤灰填料细粒混凝土流动性、抗压强度、抗冲磨强度等物理力学及耐久性能,探讨了疏浚砂不同含泥量(1.3％、5.3％、9.3％、13.3％)对细粒混凝土性能影响.结果表明粉煤灰和石灰石粉为填料的干混物料最大堆积密度分别达2 083.8 kg/m3和1 979.9 kg/m3,最大堆积密度下填料与砂子的质量比分别为0.13和0.10,28 d抗压强度分别达39.8 MPa和34.1 MPa;较之1.3％含泥量,以粉煤灰为填料含泥量为13.3％的细粒混凝土 3 d、28 d和90 d抗压强度分别降低了 27.8％、13.5％和16.4％.含泥量少的试样表观密度更高、泌水性降低,保水性和工作性更好.制备的细粒混凝土可以替代普通混凝土制备路面砖、联锁块、鱼槽砖、扭王块等小型预制块体,就近应用于航道整治、道路或市政工程.
Abstract
In order to prepare a new type of fine-grained concrete without coarse aggregate instead of ordinary concrete using dredged sand in channels,the physical and mechanical properties,such as mobility,compressive strength and abrasion resistance of fine-grained concrete filled with limestone powder and fly ash were compared and analyzed,and the influence of different mud contents(1.3％,5.3％,9.3％,13.3％)of dredged sand on the performance of fine-grained concrete was explored.The results showed that the maximum bulk densities of dry mixed materials filled with fly ash and limestone powder were 2 083.8 kg/m3 and 1 979.9 kg/m3,respectively.The ratio of filler to sand was 0.13 and 0.10,and the compressive strength at 28 days was 39.8 MPa and 34.1 MPa,respectively;Compared to the 1.3％mud content,the compressive strength of fine-grained concrete with a mud content of 13.3％filled with fly ash at 3 days,28 days,and 90 days decreased by 27.8％,13.5％,and 16.4％,respectively.Samples with lower mud content have higher apparent density,lower bleeding capacity,and better water retention and workability.The prepared fine-grained concrete can replace ordinary concrete to prepare small prefabricated blocks such as pavement bricks,interlocking blocks,fish groove bricks,and twisted king blocks,which can be applied nearby in waterway regulation,roads,or municipal engineering.
维普
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