Insights into durability assessment for compacted soils treated with paper sludge ash-based stabilizers

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-12-01 DOI:10.1016/j.sandf.2023.101399
Navila Tabassum , Ryo Sekine , Kimitoshi Hayano , Binh Nguyen Phan , Hiromoto Yamauchi
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Abstract

To utilize industrial by-products in construction projects, soil stabilization using paper sludge ash-based stabilizers (PSASs) has recently been developed. PSASs can be manufactured by insolubilizing the heavy metals in original paper sludge (PS) ash, which is a waste product emitted from paper mills. This study assessed the durability of clays treated with PSASs in wet-dry or dry-wet environments through various evaluation tests. Initially, the particle size distributions (PSDs) in the clays that had undergone various pretreatments were assessed. Then, unconfined compression tests were performed on the treated clays that had undergone dry and wet curing cycles using demolded specimens. Finally, cone index tests were carried out on the treated clays that had undergone dry and wet curing cycles while the samples were constrained in molds. Based on the test results, the durability assessment of the clays treated with PSASs was discussed, considering the specifics of each evaluation test and contrasting the findings with those obtained for clays treated with cement. The generated PSDs were found to contain more fine particles as the time spent washing the samples prior to sieving was increased. The findings indicated that PSAS-treated clays will eventually become muddy, even though it is unlikely that these treated clays will ever be subjected to washing with water while being stirred after construction. The unconfined compression test results also demonstrated that, after several dry-wet cycles, the strength of the PSAS-treated specimens had decreased. It was revealed that clays treated with PSASs might be less resistant to dry-wet curing cycles than those treated with cement. However, PSAS-treated samples using unconfined compression test specimens are still being investigated and are a topic of debate because the strength development mechanisms of PSASs and cement are not similar. To address this issue, a series of cone index tests were conducted on samples treated with PSASs to examine the change in strength caused by the dry-wet curing process. The results of the cone index tests were different from those of the unconfined compression tests. The cone index test results revealed that the samples must be constrained during the assessment tests in order to assess the durability of PSAS-treated soils subjected to dry-wet curing. In addition, it was proposed in this study that the idea of maturity would be applicable to PSAS-treated soils with a range of curing temperatures and curing times as long as the soils were constrained during the assessment tests.

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纸污泥灰基稳定剂处理压实土的耐久性评价
为了在建筑工程中利用工业副产品,近年来开发了纸污泥灰基稳定剂(PSASs)用于土壤稳定。pass可以通过将重金属溶解在原纸污泥(PS)灰中来制造,这是造纸厂排放的废物。本研究通过各种评价试验,评价了经pass处理的粘土在干湿和干湿环境下的耐久性。首先,评估了经过各种预处理的粘土中的粒径分布(psd)。然后,使用脱模试样对经过干湿养护循环的处理粘土进行无侧限压缩试验。最后,在模具约束条件下,对处理后的粘土进行了干湿循环养护试验,并进行了锥指数试验。根据试验结果,讨论了经PSASs处理的粘土的耐久性评估,考虑了每次评估试验的具体情况,并将结果与经水泥处理的粘土进行了对比。随着在筛分前洗涤样品的时间的增加,发现生成的psd含有更多的细颗粒。研究结果表明,psas处理过的粘土最终会变得泥泞,尽管这些处理过的粘土在施工后搅拌时不太可能受到水的冲刷。无侧限压缩试验结果也表明,经过多次干湿循环后,psas处理的试件强度有所下降。结果表明,与水泥处理的粘土相比,经PSASs处理的粘土对干湿循环的抵抗能力较弱。然而,由于PSASs和水泥的强度发展机制不相似,使用无侧限压缩试样进行PSASs处理的样品仍在研究中,并且是一个有争议的话题。为了解决这一问题,对经过PSASs处理的样品进行了一系列锥体指数测试,以检查干湿固化过程引起的强度变化。锥体折射率试验结果与无侧限压缩试验结果不同。锥指数试验结果表明,在评估试验期间,样品必须受到约束,以评估干湿固化下psas处理的土壤的耐久性。此外,本研究还提出,只要在评估试验期间对土壤进行约束,在一定的养护温度和养护时间范围内,psas处理的土壤也适用成熟度概念。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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