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首页> 美国卫生研究院文献>Materials >The Chemical-Mineralogical Characterization of Recycled Concrete Aggregates from Different Sources and Their Potential Reactions in Asphalt Mixtures
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The Chemical-Mineralogical Characterization of Recycled Concrete Aggregates from Different Sources and Their Potential Reactions in Asphalt Mixtures

机译：来自不同来源的再生混凝土聚集体的化学 - 矿物学特征及其在沥青混合物中的潜在反应

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The incorporation of a recycled concrete aggregate (RCA) as a replacement of natural aggregates (NA) in road construction has been the subject of recent research. This tendency promotes sustainability, but its use depends mainly on the final product’s properties, such as chemical stability. This study evaluates the physical and chemical properties of RCAs from two different sources in comparison with the performance of NA. One RCA was obtained from the demolition of a building (recycled concrete aggregate of a building—RCAB) and another RCA from the rehabilitation of a Portland cement concrete pavement (recycled concrete aggregate from a pavement—RCAP). Characterization techniques such as X-ray fluorescence (XRF), X-ray diffraction (XRD), UV spectroscopy, and atomic absorption spectrometry were used to evaluate the RCAs’ coarse fractions for chemical potential effects on asphalt mixtures. NA was replaced with RCA at 15%, 30%, and 45% for each size of the coarse fractions (retained 19.0, 12.5, 9.5, and 4.75 sieves in mm). The mineralogical characterization results indicated the presence of quartz (SiO2) and calcite (CaCO3) as the most significant constituents of the aggregates. XFR showed that RCAs have lower levels of CaO and Al2O3 concerning NA. Potential reactions in asphalt mixtures by nitration, sulfonation, amination of organic compounds, and reactions by alkaline activation in the aggregates were discarded due to the minimum concentration of components such as NO2, (–SO3H), (–SO2Cl), and (Na) in the aggregates. Finally, this research concludes that studied RCAs might be used as replacements of coarse aggregate in asphalt mixtures since chemical properties do not affect the overall chemical stability of the asphalt mixture.
机译：将再生混凝土骨料（RCA）纳入道路建设中的自然聚集体（NA）的替代是最近的研究的主题。这种趋势促进了可持续性，但其使用主要取决于最终产品的性质，例如化学稳定性。该研究与NA的性能相比，评估了来自两种不同来源的RCA的物理和化学性质。从建筑物的拆除（建筑物RCAB的再生混凝土骨料）和另一个RCA的拆除中获得了一个RCA，从港口水泥混凝土路面的康复（来自路面RCAP的再生混凝土骨料）。使用诸如X射线荧光（XRF），X射线衍射（XRD），UV光谱学和原子吸收光谱法的表征技术用于评价RCAS'粗级分，以进行沥青混合物的化学势效应。对于每尺寸的粗馏分（保留19.0,12.5,9.5和4.75米），将Na用15％，30％和45％的RCA代替。矿物学表征结果表明，存在石英（SiO 2）和方解石（CaCO 3）作为聚集体中最重要的成分。 XFR显示RCA有较低的CaO和Al2O3含量。由于NO 2，（-SO3H），（-MO 2 Cl）等最小组分的最小浓度，通过硝化，磺化，有机化合物胺化和通过碱性活化的反应的沥青混合物和聚集体中的反应的潜在反应。在聚集体中。最后，该研究得出结论，研究的RCA可以用作沥青混合物中粗骨料的替代品，因为化学性质不影响沥青混合料的整体化学稳定性。

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