Influence of Carbonation on the Microstructure and Hydraulic Properties of a Basic Oxygen Furnace Slag
Influence of Carbonation on the Microstructure and Hydraulic Properties of a Basic Oxygen Furnace Slag
复制标题
碳化对碱性氧气炉渣微观结构和水硬性能的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Legret
中科院分区：
文献类型：
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作者：
D. Yılmaz;L. Lassabatère;D. Deneele;R. Angulo;M. Legret
碱性氧气转炉（BOF）炉渣被认为是一种潜在的替代建筑材料，并在这里使用的实验地块，以准确地量化污染物释放的风险。由于污染物的释放取决于流量，这首先需要表征转炉炉渣的水力特性。这些监测和估计在小区尺度进行水渗透实验和逆数值模拟。监测曲线表明，所研究的转炉炉渣由于风化过程而在表面结皮。数值反演结果表明，结皮材料的保水性和导水率函数与未发生变化的矿渣不同。虽然所有的数据都指出，在饱和导水率与结壳减少，趋势取决于渗透装置用于毛细管长度（张力盘与Beerkan）。并行监测实验室风化单元的扫描电子显微镜（SEM）微观分析和蒸渗仪测量，以更精确地研究微观结构，并强调堵塞导致孔隙率降低。在SEM观察的基础上，两个概念模型的孔隙减少，基于两个不同的孔隙堵塞假说，应用于预测水力特性。这一步骤表明，对保水性和水力传导性的影响强烈依赖于沉淀相的形成和涂层颗粒的方式，并可以解释所观察到的运输性能的演变。本研究有助于了解转炉炉渣的水硬性及其在碳酸化过程中的变化。
Basic oxygen furnace (BOF) slag is considered as a potential alternative construction material and is used here on an experimental plot to accurately quantify the risk of pollutant release. Since pollutant release depends on flow, this initially requires characterizing BOF slag hydraulic properties. These were monitored and estimated at plot scale by carrying out water infiltration experiments and inverse numerical modeling. Monitoring the plot showed that the BOF slag studied crusted at the surface as a result of weathering processes. Numerical inversion proved that the crusted material differed from the unaltered slag in terms of water retention and hydraulic conductivity functions. Although all the data pointed to a decrease in saturated hydraulic conductivity with crusting, the trends depended on the infiltration devices used for the capillary length (tension disc vs. Beerkan). Scanning electron microscope (SEM) microanalysis of laboratory weathering cells and lysimeter measurements were monitored in parallel to study the microstructure more precisely and highlighted a reduction of porosity by clogging. On the basis of SEM observations, two conceptual models of pore reduction, based on two different pore clogging hypotheses, were applied to predict hydraulic properties. This step demonstrated that the effect on water retention and hydraulic conductivity strongly depended on the way precipitated phases form and coat grains and could explain the evolution of the transport properties observed. This study contributes to knowledge on the hydraulic properties of BOF slag and their evolution due to carbonation.