Experiment on MICP-solidified calcareous sand with different rubber particle contents and sizes

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xinxing Xu, Xinning Yan
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Abstract

Microbially induced calcite precipitation (MICP) is a new environmentally friendly technology, with the ability to improve the mechanical properties of calcareous sand. Rubber is a high-compressibility material with a higher damping ratio than that of calcareous sand. In this study, calcareous sand was replaced by equal volume contents (0%, 1%, 3%, 5%, 7%, and 9%) and different sizes (0–1, 1–2, and 2–3 mm) of rubber, and a series of water absorption and unconfined compressive strength (UCS) tests were conducted on MICP-solidified rubber–calcareous sand (MRS). The results showed that the water absorption is reduced when the rubber content is larger. The UCS of 0–1-mm MRS decreased with the increase in rubber content. For 1–2-mm and 2–3-mm MRS, the UCS was improved by 11.30% and 15.69%, respectively, compared with the clean sand. Adding rubber promoted the formation of calcium carbonate, but the strength and stiffness of rubber particles were lower than those of the calcareous sand. Therefore, higher rubber content weakened the sand frame bearing system, and the UCS decreased when the rubber content was more than 5%. Moreover, a large amount of 0–1-mm rubber led to the increase in transverse deformation of the samples, which caused the acceleration of the destruction of the sand structure. The water absorption of 0–1-mm MRS was higher than that of 1–2-mm and 2–3-mm MRS, but the UCS of 0–1-mm MRS was lower. The best rubber size is 1–2 mm and 2–3 mm, and the best rubber content is 3%–5%. The outcome of this study may, in the authors’ view, prove beneficial in improving the strength of calcareous sand when it is reinforced by MICP-combined rubber.
不同橡胶颗粒含量和大小的 MICP 固化钙质砂实验
微生物诱导方解石沉淀(MICP)是一种新型环保技术,能够改善钙质砂的机械性能。橡胶是一种高压缩性材料,其阻尼比高于钙质砂。在这项研究中,用等体积含量(0%、1%、3%、5%、7% 和 9%)和不同大小(0-1、1-2 和 2-3 毫米)的橡胶取代了钙质砂,并对 MICP 固化橡胶-钙质砂(MRS)进行了一系列吸水率和无侧限抗压强度(UCS)测试。结果表明,橡胶含量越大,吸水率越低。0-1 毫米 MRS 的 UCS 随橡胶含量的增加而降低。与洁净砂相比,1-2 毫米和 2-3 毫米 MRS 的 UCS 分别提高了 11.30% 和 15.69%。添加橡胶可促进碳酸钙的形成,但橡胶颗粒的强度和刚度低于钙质砂。因此,较高的橡胶含量会削弱砂框架承载系统,当橡胶含量超过 5%时,UCS 会下降。此外,大量的 0-1 毫米橡胶会导致样品的横向变形增大,从而加速砂结构的破坏。0-1 毫米 MRS 的吸水率高于 1-2 毫米和 2-3 毫米 MRS,但 0-1 毫米 MRS 的 UCS 较低。最佳橡胶尺寸为 1-2 毫米和 2-3 毫米,最佳橡胶含量为 3%-5%。作者认为,这项研究的结果可能有利于提高钙质砂在使用 MICP 复合橡胶加固时的强度。
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
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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