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首页> 外文期刊>Magazine of Concrete Research >Effect of magnetic field intensity on fracture behaviours of self-compacting lightweight concrete
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Effect of magnetic field intensity on fracture behaviours of self-compacting lightweight concrete

机译：磁场强度对自密实轻质混凝土断裂性能的影响

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摘要

The effects of water subjected to an electromagnetic field on the fracture parameters and mechanical properties of self-compacting lightweight concrete (SCLC) were investigated. The test variables were the magnetic field intensity (MFI) used to treat the water and the water/cement (w/c) ratio. Eight mix compositions with various MFIs and two w/c ratios (0.37 and 0.42) were considered. For each w/c ratio, the nominal maximum aggregate size and all mix designs were constant, while four magnetic fields were considered. Three-point bending tests were conducted on 96 notched beams and the results were analysed by means of the size effect method. Satisfactory results were achieved in terms of the fracture parameters and the mechanical properties of the SCLC. By increasing the MFI, the results indicated that: (a) the mechanical properties, initial fracture energy and fracture toughness increased at different rates, which can be attributed to the positive effects of the magnetic field on water clusters; (b) the effective length of the fracture process zone increased, illustrating an improvement in ductility of the SCLC specimens; (c) the desired design criterion of the SCLC samples approached the strength criterion.
机译：研究了电磁场对自密实轻质混凝土（SCLC）的断裂参数和力学性能的影响。测试变量是用于处理水的磁场强度（MFI）和水/水泥（w / c）比率。考虑了八种具有各种MFI和两个w / c比（0.37和0.42）的混合物。对于每个w / c比率，标称最大骨料尺寸和所有混合料设计都是恒定的，同时考虑了四个磁场。对96个带缺口的梁进行了三点弯曲测试，并通过尺寸效应方法对结果进行了分析。就SCLC的断裂参数和机械性能而言，获得了令人满意的结果。通过增加MFI，结果表明：（a）力学性能，初始断裂能和断裂韧度以不同速率增加，这可以归因于磁场对水团簇的积极影响； （b）断裂过程带的有效长度增加，说明SCLC试样的延展性得到改善； （c）SCLC样品的所需设计标准接近强度标准。

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