Geotechnical characterisation of zinc tailing waste material for road construction

IF 1.7 Q3 ENGINEERING, GEOLOGICAL Geomechanics and Geoengineering-An International Journal Pub Date : 2021-11-02 DOI:10.1080/17486025.2021.1990420

A. Sinha, V. G. Havanagi, P. G. Sreekantan, S. Chandra

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引用次数: 5

Abstract

ABSTRACT Zinc tailing waste material is generated during the extraction of zinc metal. Its deposit is increasing year after year posing a threat to the environment and occupying large precious land. The present research explores the possibility of its application in road construction and filling. Physical and chemical tests were carried out, viz. SEM, EDS, X-ray diffraction and toxicity characteristics leachate procedure. The geotechnical characterisation was carried out and compared with similar types of materials, viz. soil and industrial wastes (fly ash and jarofix). Stress-settlement behaviour was studied by using a small scale physical model and validated by a numerical model test. Tailing was further mixed with cement to improve its properties for application in stabilised layers. Tailing is a porous, multi-phase and non-swelling cohesionless fine-grained material. It contains mainly oxides of silica, alumina, magnesium, calcium and less concentration of heavy metals. It has a high dry density (18.62 kN/m3), California Bearing Ratio (11%) and angle of internal friction (34°) compared to soil which makes it suitable for road construction. Cement stabilised tailing can be used in sub-base layer and can save about 170 mm thickness of the aggregate layer. Modulus value (18.17 MPa) indicates that it is a stiff material which leads to less settlement as a structural fill.

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道路施工用锌尾矿废料的岩土工程特性

锌尾矿是金属锌提取过程中产生的尾矿。其储量逐年增加，对环境构成威胁，占用大量宝贵土地。本研究探讨了其在道路施工和填筑中应用的可能性。进行了物理和化学测试，即扫描电镜，能谱，x射线衍射和毒性特征渗滤液程序。进行了岩土特性分析，并与类似类型的材料进行了比较，即土壤和工业废物(粉煤灰和黄矾)。采用小尺度物理模型对其应力沉降特性进行了研究，并通过数值模型试验进行了验证。尾矿进一步与水泥混合，以改善其在稳定层中的应用性能。尾矿是一种多孔、多相、不膨胀、无粘结的细粒物料。主要含二氧化硅、氧化铝、镁、钙等氧化物，重金属含量较低。与土壤相比，它具有较高的干密度(18.62 kN/m3)，加州承载比(11%)和内摩擦角(34°)，使其适合道路建设。水泥稳定尾砂可用于次基层，可节省集料层厚度约170 mm。模量值(18.17 MPa)表明其为刚性材料，作为结构填料沉降较小。

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来源期刊

Geomechanics and Geoengineering-An International Journal ENGINEERING, GEOLOGICAL-

CiteScore

3.80

自引率

0.00%

发文量

期刊介绍： Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.