Slake durability and mineralogical characteristic of carbonaceous rocks

IF 3.7 2区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Tao Zhang, Yu-Ling Yang
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Abstract

The slake durability and the related deterioration mechanism of carbonaceous rocks exposed to adverse external environment are of a great importance to the stability of infrastructure. A series of laboratory tests were conducted to determine their slake durability index Idi, fractal dimension D, total organic carbon (TOC) content, and mineralogical characteristic. The results demonstrated that Idi value decreased rapidly within the first 4 cycles, and then reached a relatively stable state as the test cycle further increased, indicating that effective protective measures should be conducted at the earlier stage of wetting-drying process to minimize the durability deterioration of carbonaceous rock. The discrepancy of carbonaceous rocks in terms of mineralogical characteristic accounted for different slake durability responses at a given cycle. Carbonaceous rock with lower clay minerals content wc possessed superior slake durability performance, and a power correlation between Id6 and wc was obtained. Fractal dimension D was found to be an indicator to indirectly describe the durability characteristic of carbonaceous rock. The organic matter imposed negative impact on the slake durability, which was manifested by the carbonaceous rock with higher TOC content exhibited inferior disintegration resistance. The microstructure changes, including an increase in pore volume, pore size, layer spacing, and the presence of new crystalline-like substances, demonstrated the minerals/salts dissolution and chemical reactions within the rock matrix occurred during the slake durability test. These changes were mainly attributed to the hybrid influence of mineralogy and microstructure of carbonaceous rock.

石渣的耐久性和碳质岩石的矿物学特征
暴露在不利外部环境中的碳质岩石的抗裂耐久性和相关退化机制对基础设施的稳定性至关重要。研究人员在实验室进行了一系列试验,以测定碳质岩石的抗滑耐久性指数 Idi、分形维数 D、总有机碳(TOC)含量和矿物学特征。结果表明,Idi 值在前 4 个周期内迅速下降,然后随着试验周期的进一步增加而达到相对稳定的状态,这表明应在湿润-干燥过程的早期阶段采取有效的保护措施,以尽量减少碳质岩石的耐久性退化。碳质岩石在矿物学特征方面的差异导致其在特定周期内的节拍耐久性反应不同。粘土矿物含量较低的碳质岩石 wc 具有更优越的熨平板耐久性能,并且 Id6 与 wc 之间存在幂相关性。研究发现,分形维数 D 是间接描述碳质岩石耐久性特征的一个指标。有机质对坍落度耐久性有负面影响,表现为 TOC 含量较高的碳质岩石表现出较低的抗崩解性。微观结构的变化,包括孔隙体积、孔隙大小、层间距的增加,以及新结晶状物质的出现,表明在脆化耐久性试验过程中,岩石基质中的矿物/盐发生了溶解和化学反应。这些变化主要归因于碳质岩石矿物学和微观结构的混合影响。
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来源期刊
Bulletin of Engineering Geology and the Environment
Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合
CiteScore
7.10
自引率
11.90%
发文量
445
审稿时长
4.1 months
期刊介绍: Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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