Abstract

Purpose

In most of previous studies about aggregate breakdown caused by water erosion, a critical process that water inevitably fragments the eroded aggregates by water erosion again is generally ignored. This will reduce the accuracy of research results. Hence, alcohol has been added to the collecting device of eroded aggregates to weaken the slaking of eroded aggregates by the researchers, but the optimal alcohol-to-water ratio for protecting the size fraction distribution of eroded aggregates remains unclear.

Materials and methods

Aggregate with a size fraction of 2–5 mm obtained by dry sieving of black soil in Northeast China was selected as the research object to analyse the effects of five alcohol-to-water ratios on aggregate characteristics and their variation with soaking time.

Results and discussion

The results showed that the size distribution in terms of mass percentage under different soaking times was similar. For the same soaking time, the mass percentage of 2–5-mm aggregates gradually decreased with decreasing alcohol ratio, but the aggregates with the second-highest mass percentage were gradually distributed among smaller size fractions. Compared with the alcohol soaking aggregates, the mean weight diameter (MWD) of the aggregates soaked in the other ratio of alcohol-to-water decreased gradually with the increase of soaking time, and the disintegration of the aggregates was the most evident at the initial stage of soaking. A percentage of aggregate destruction (PAD) of 20% served as the dividing line to evaluate the stability of soil aggregates. In this case, eroded aggregate collection should be completed within 12 min at an alcohol-to-water ratio of 1:1. Alternatively, eroded aggregate collection should be completed within 6 min at an alcohol-to-water ratio of 2:3.

Conclusions

The above results can provide a reference for improving the accuracy of data collection regarding eroded aggregates. Especially in the study of water erosion which needs to collect eroded aggregates, alcohol can be added to the collecting device before the experiment. The amount of alcohol should be added according to the amount of water that may be generated, so as to protect eroded aggregates and weaken the slaking of eroded aggregates.

中文翻译：

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一种新的水蚀弱化集料侵蚀碎石的新方法

摘要

目的

在先前有关水蚀引起的骨料分解的大多数研究中，通常都忽略了水不可避免地再次因水蚀而使侵蚀的骨料破碎的关键过程。这将降低研究结果的准确性。因此，研究人员已将酒精添加到侵蚀性骨料的收集装置中，以减弱侵蚀性骨料的分解，但仍不清楚用于保护侵蚀性骨料的尺寸分数分布的最佳醇水比。

材料和方法

以东北黑土干筛法得到的粒径为2〜5mm的骨料为研究对象，分析了5种醇水比对骨料特性及其随浸泡时间变化的影响。

结果和讨论

结果表明，在不同的浸泡时间下，以质量百分数表示的粒度分布是相似的。在相同的浸泡时间下，2-5 mm骨料的质量百分比随着酒精比的降低而逐渐降低，但质量百分比第二高的骨料则逐渐分布在较小的馏分中。与浸泡酒精的团聚体相比，以酒精/水的其他比例浸泡的团聚体的平均重均直径（MWD）随着浸泡时间的增加而逐渐减小，并且团聚体的分解在开始时最为明显。浸泡阶段。总破坏百分比（PAD用20％的）作为评估土壤团聚体稳定性的分界线。在这种情况下，侵蚀的骨料收集应在12分钟内以1：1的酒精/水比例完成。或者，侵蚀的骨料收集应在6分钟内以2：3的酒精与水的比例完成。

结论

以上结果可为提高侵蚀聚集体数据采集的准确性提供参考。特别是在需要收集侵蚀的骨料的水蚀研究中，可以在实验前将酒精添加到收集装置中。应根据可能产生的水的量添加酒精的量，以保护侵蚀的骨料并减弱侵蚀的骨料的分解。