Liu Qun, Lin Weiqing, Xi Lei
School of Architecture and Art Design, Hubei Communications Technical College, Wuhan, China.
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, China.
Sci Rep. 2024 Dec 30;14(1):31582. doi: 10.1038/s41598-024-73552-z.
The dolomite dust-emulsified asphalt composite (DAC) with excellent mechanical properties was successfully prepared using alkali activation. The effects of different alkali concentrations and emulsified asphalt contents on the mechanical properties of the materials were studied. And the micro-mechanisms of its mechanical performance changes were analyzed through SEM and XRD characterization. The experimental results show that the specimens have excellent mechanical properties: the 7-day compressive strength can reach 76.67 MPa, and the bending and compressive strength ratio is about twice that of silicate-based geopolymer-emulsified asphalt composite (SAC). With an increase in emulsified asphalt content, the compressive strength of the samples decreases, while the bending strength increases first and then decreases. When the emulsified asphalt content is 1%, the bending strength of the sample is up to 28.81 MPa, which is 25% higher than that of the sample without emulsified asphalt. The in-situ formation of calcium carbonate crystal clusters within the DAC was suggested that may support this performance. This crystalline structuring contributes to an expanded interfacial contact area between the asphalt and skeleton particles, thereby enhancing the demulsification and bonding properties of the emulsified asphalt. This indicates that an appropriate emulsified asphalt content can play a toughening role in the system, providing a new idea for designing high-toughness alkali-activated materials.
采用碱激发成功制备了具有优异力学性能的白云石粉尘乳化沥青复合材料（DAC）。研究了不同碱浓度和乳化沥青含量对材料力学性能的影响，并通过扫描电子显微镜（SEM）和X射线衍射（XRD）表征分析了其力学性能变化的微观机制。实验结果表明，该试件具有优异的力学性能：7天抗压强度可达76.67MPa，抗弯与抗压强度比约为硅酸盐基地质聚合物乳化沥青复合材料（SAC）的两倍。随着乳化沥青含量的增加，样品的抗压强度降低，而抗弯强度先增加后降低。当乳化沥青含量为1%时，样品的抗弯强度高达28.81MPa，比未添加乳化沥青的样品高25%。DAC内部碳酸钙晶体簇的原位形成可能是这种性能的支撑原因。这种晶体结构有助于扩大沥青与骨架颗粒之间的界面接触面积，从而增强乳化沥青的破乳和粘结性能。这表明适当的乳化沥青含量可以在体系中起到增韧作用，为设计高韧性碱激发材料提供了新思路。
