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Effect of compaction energy on physical and mechanical performance of bitumen emulsion mortar

机译：压实能量对沥青乳液砂浆物理力学性能的影响

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摘要

An implementation of innovative material concepts like composites of bitumen emulsion and cement is crucial to increase the environmental sustainability of pavement construction industry. Although, newly developed method for characterising the influence of bitumen emulsion on the asphalt mixture performance significantly facilitates the evaluation of such composites, there is still a potential for its improvement. The research objective was to evaluate the effect of compaction energy on the performance of the reduced-size cylindrical bitumen emulsion mortar specimens and select the most suitable compaction pattern to be adopted as a standard procedure. Different compaction energy was applied by varying the static compaction conditions, i.e. force and time-related parameters, and the effect on the mechanical properties was determined by indirect tensile testing. The results showed the substantial influence of the compaction energy on the resulting mechanical properties. The primary causes for this were the changes in the volumetric structure of the specimens at lower forces and shorter time of compaction, and the micro-damage by destruction of the early bonding at higher forces and longer time of compaction. Contrary to this, the evaluation of the loss of water by evaporation concerning the cement hydration did not show any clear implication. This emphasised the need to continue the research on the fundamental understanding of the influence of cement hydration on the distribution of the water phase in the mixtures with bitumen emulsion over time.
机译：实施创新的材料概念（如沥青乳液和水泥的复合材料）对于提高路面建筑行业的环境可持续性至关重要。尽管新开发的表征沥青乳液对沥青混合料性能影响的方法大大促进了此类复合材料的评估，但仍有改进的潜力。研究目的是评估压实能量对减小尺寸的圆柱形沥青乳液砂浆样本性能的影响，并选择最合适的压实模式作为标准程序。通过改变静态压实条件，即力和时间相关参数，施加不同的压实能量，并通过间接拉伸试验确定对机械性能的影响。结果表明，压实能量对所得的机械性能有重大影响。造成这种现象的主要原因是，在较低的力和较短的压实时间下，试样的体积结构发生了变化；在较高的力和较长的压实时间下，由于破坏了早期的粘结，造成了微损伤。与此相反，关于水泥水化的蒸发损失水的评估没有明显的含义。这就强调需要继续研究关于水泥水化对沥青乳化液混合物中水相随时间的分布影响的基本认识。

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