Abstract To investigate the physico-mechanical properties of municipal solid waste incineration bottom ash (MSWIBA), the factors influencing the strength characteristics of MSWIBA were studied using an ultrasonic wave velocity test, to investigate its physico-mechanical properties. The test results show that the curing age, dry density, temperature, particle size, moisture content, and soaking time in water affect the strength of MSWIBA. The analyses of the wave velocity suggest that the strength of MSWIBA increases with its curing age and dry density. The strength increases rapidly over a curing age of 3–7 days but increases slowly after 14 days. In addition, the strength increases under an increase in temperature within the range of 20–50 °C, and it tends to stabilize above 50 °C. Moreover, the moisture content and particle size have a significant effect on the strength. MSWIBA, with a particle size of 0–2 mm, exhibits the greatest strength, and its strength is maximal at the optimum moisture content (15%). The soaking time in water has an adverse impact on the strength of MSWIBA during the first 80 h, decreasing its strength by approximately 5%. Moreover, the Poisson’s ratio of MSWIBA is determined using wave velocity ratios from elastic theory.

中文翻译：

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城市生活垃圾焚烧底灰强度特性的超声波速度试验研究

摘要 为研究城市生活垃圾焚烧底灰(MSWIBA)的物理力学性能，采用超声波速度试验研究了影响MSWIBA强度特性的因素，研究了其物理力学性能。测试结果表明，固化时间、干密度、温度、粒径、含水量和在水中浸泡的时间会影响 MSWIBA 的强度。波速分析表明，MSWIBA 的强度随着其固化时间和干密度而增加。强度在 3-7 天的固化时间内迅速增加，但在 14 天后缓慢增加。此外，强度在20-50°C范围内随温度升高而增加，并且在50°C以上趋于稳定。而且，水分含量和粒度对强度有显着影响。MSWIBA，粒径为0-2mm，强度最大，在最佳含水量（15%）下强度最大。在前 80 小时内，在水中浸泡时间对 MSWIBA 的强度有不利影响，使其强度降低约 5%。此外，MSWIBA 的泊松比是使用弹性理论的波速比确定的。