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首页> 外文期刊>Journal of Environmental Engineering >Mechanical, Chemical, Hydraulic, and Microstructural Properties of Buckshot Clay Amended with Gasification Biochar
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Mechanical, Chemical, Hydraulic, and Microstructural Properties of Buckshot Clay Amended with Gasification Biochar

机译：用气化生物炭修正的Buckshot粘土的机械，化学，液压和微观结构性能

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摘要

This study investigated the effect of gasification biochar amendment on mechanical, chemical, hydraulic, and microstructural properties of Buckshot clay, a high-plasticity clay with poor engineering properties. The gasification biochar used for this study was a waste biochar produced as a byproduct of gasification at a lumber mill. The feed stock for this material was the residual pine material from the plant. The biochar was separated into two sizes: coarse (passing sieve No. 8 and retained on sieve No. 20), and fine (passing sieve No. 20). Shear strength, swelling, compressibility, collapsibility, hydraulic conductivity, water retention, cation exchange capacity, pH, and microstructural characteristics were determined for the clay amended with 5%, 10%, and 20% gasification biochar. For the tested materials, the results indicated modest increases in the shear strength up to 10% biochar content for both the coarse and fine biochars. There was no significant reduction in the maximum swell pressure for the fine biochar until the 20% level, which corresponds to a greater than 50% reduction. The coarse biochar exhibited a more gradual reduction, with each increase in biochar content resulting in a decrease in the maximum swelling pressure with a maximum reduction of approximately 50%. Slightly increased compressibility and more brittle behavior were also noted with increased levels of biochar amendment. Higher levels of biochar addition noticeably increased the compression index with the greatest increase occurring for the coarse biochar. Minor increases in the soil's pH and collapse potential were also observed. The cation exchange capacity of the material decreased with increases in biochar. Gasification biochars exhibit large variability in properties and characteristics depending upon the source and process used to produce the biochar. This study aimed to present a framework to evaluate the potential benefits of the reuse of gasification biochars for improving geotechnical proprieties of marginal soils for select applications such as nonstructural fills. For site-specific applications, depending on the local source of gasification biochar, running laboratory tests on site-specific materials are needed.
机译：本研究考察了气化生物炭改性对高塑性、工程性能差的荞麦粘土的力学、化学、水力和微观结构性能的影响。本研究中使用的气化生物炭是木材厂气化副产物产生的废生物炭。这种材料的原料是工厂的残余松木材料。将生物炭分为两种尺寸：粗（通过8号筛并保留在20号筛上）和细（通过20号筛）。测定了添加5%、10%和20%气化生物炭的粘土的抗剪强度、膨胀性、压缩性、溃散性、导水性、保水性、阳离子交换容量、pH值和微观结构特征。对于受试材料，结果表明，粗生物炭和细生物炭的剪切强度均略有增加，最高可达10%。在达到20%的水平之前，细生物炭的最大膨胀压力没有显著降低，这对应于大于50%的降低。粗生物炭表现出更为缓慢的减少，生物炭含量的每次增加导致最大膨胀压力的降低，最大减少约50%。随着生物炭添加量的增加，压缩性略有增加，脆性增加。较高水平的生物炭添加显著增加了压缩指数，粗生物炭的增加幅度最大。还观察到土壤的pH值和崩塌可能性略有增加。随着生物炭用量的增加，材料的阳离子交换容量降低。气化生物炭的性质和特性表现出很大的变化，这取决于用于生产生物炭的来源和工艺。本研究旨在提出一个框架，评估气化生物炭再利用的潜在效益，以改善边缘土壤的岩土性质，用于非结构性填料等特定应用。对于特定于现场的应用，根据气化生物炭的当地来源，需要对特定于现场的材料进行实验室测试。

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