Liu Wenhuan, Li Hui, Zhu Huimei, Xu Pinjing
College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China.
Materials (Basel). 2020 Sep 2;13(17):3885. doi: 10.3390/ma13173885.
In this paper, a permeable steel-slag-bitumen mixture (PSSBM) was first prepared according to the designed mixture ratio. Then, the interaction characteristics between steel slag and bitumen were studied. The chemical interaction between bitumen and steel slag was explored with a Fourier-transform infrared spectrometer (FT-IR). The influence of steel-slag chemistry, mineral composition, and bitumen reaction on phase angle, complex shear modulus (CSM), and rutting factor was explored with dynamic shear rheological (DSR) tests. The PSSBM had better properties, including high permeability, water stability, Marshall stability, high-temperature (HT) stability, and low volume-expansion rate. Bitumen-coated steel slag can prevent heavy-metal ions from leaching. In the infrared spectra of the mixture of a chemical component of steel slag (calcium oxide) and bitumen, a new absorption peak at 3645 cm was ascribed to the SiO-H stretching vibration, indicating that new organic silicon compounds were produced in the chemical reaction between calcium oxide and bitumen. SiO-H had an obvious enhancement effect on the interfacial adhesion and high-temperature rheological property of the mixture. In the mineral components of steel slag, dicalcium and tricalcium silicate reacted with bitumen and generated new substances. Chemical reactions between tricalcium silicate and bitumen were significant and had obvious enhancement effects on interfacial adhesion and high-temperature rheological properties of the mixture. The results of FT-IR and DSR were basically consistent, which revealed the chemical-reaction mechanism between steel-slag microcomponents and bitumen at the interface. SEM results showed that pits and grooves on the surface of the steel-slag aggregate, and the textural characteristics provide a framework-like function, thus strengthening the strength and adhesion of the steel-slag-bitumen aggregate interface.
本文首先按照设计配合比制备了一种透水钢渣沥青混合料（PSSBM）。然后，研究了钢渣与沥青之间的相互作用特性。利用傅里叶变换红外光谱仪（FT - IR）探究了沥青与钢渣之间的化学相互作用。通过动态剪切流变（DSR）试验，研究了钢渣化学组成、矿物成分以及与沥青的反应对相位角、复数剪切模量（CSM）和车辙因子的影响。PSSBM具有更好的性能，包括高透水性、水稳定性、马歇尔稳定性、高温（HT）稳定性和低体积膨胀率。沥青包裹的钢渣可防止重金属离子浸出。在钢渣化学成分（氧化钙）与沥青混合物的红外光谱中，3645 cm处的新吸收峰归因于SiO - H伸缩振动，表明氧化钙与沥青的化学反应中生成了新的有机硅化合物。SiO - H对混合料的界面粘结和高温流变性能有明显增强作用。在钢渣的矿物成分中，硅酸二钙和硅酸三钙与沥青发生反应并生成新物质。硅酸三钙与沥青之间的化学反应显著，对混合料的界面粘结和高温流变性能有明显增强作用。FT - IR和DSR的结果基本一致，揭示了钢渣微组分与沥青在界面处的化学反应机理。扫描电子显微镜（SEM）结果表明，钢渣集料表面的坑洼和沟槽及其纹理特征起到了类似骨架的作用，从而增强了钢渣 - 沥青集料界面的强度和粘结力。
