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首页> 外文期刊>Bulletin of engineering geology and the environment >Evaluation of selected basement complex rocks from Ado-Ekiti, SW Nigeria, as source of road construction aggregates
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Evaluation of selected basement complex rocks from Ado-Ekiti, SW Nigeria, as source of road construction aggregates

机译：评估尼日利亚西南部阿多-埃基蒂（Ado-Ekiti）选定的地下复杂岩石，将其用作筑路骨料

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The petrographical and physical properties of major Precambrian basement rocks in Ado-Ekiti, Nigeria, were evaluated with a view to determine their suitability as road construction aggregates. Fifty rock samples were collected and subjected to petrographic evaluation and laboratory tests (water absorption capacity, specific gravity, Los Angeles abrasion value, aggregate crushing value, aggregate impact value and ten percent fines, flakiness index and unconfined compressive strength). Petrographical analysis revealed that the rocks (migmatite gneiss, quartzite, granite and charnockite) were predominantly acidic, rich in quartzo-feldspathic minerals. Opaque minerals in the rock units ranged between 0.6 and 2.3 % with maximum value in fine-grained charnockite. The specific gravity of the rock aggregates ranged between 2.65 and 2.74. All water absorption capacity values conform to recommended standard value of water absorption capacity < 2 %. The aggregate crushing value of the rocks ranged between 17.6 and 28.4 % with minimum from quartzite (17.60-18.40 %) and highest in migmatite gneiss (27.70-28.40 %). The aggregate impact value ranged between 11.0 and 19.0 %, with the lowest value (11.0-11.6 %) from quartzite and highest in charnockite (18.4-19.0 %). Other properties including Los Angeles abrasion, ten percent fines, flakiness index and unconfined compressive strength ranged 17.4-29.8 %, 96.96-131.63 kN, 13 and 24.9 and 138.98-167.52 MPa, respectively. Based on physical and mechanical properties of the rock aggregates in this study, quartzite, and fine-medium grained granites were considered most suitable for road aggregates production as the tests were within the acceptable limits for general road aggregates purposes. Porphyritic granite, the migmatite gneiss and charnockites showed results for which most values were outside, at the margin or slightly within the acceptable limits for general road stone purpose. The geotechnical assessment provided by this study revealed that not all the Precambrian basement rocks would yield aggregates that are satisfactory for use as road aggregates.
机译：对尼日利亚Ado-Ekiti的主要前寒武纪基底岩的岩石学和物理性质进行了评估，以确定它们是否适合用作筑路骨料。收集了五十个岩石样品，并进行了岩相学评估和实验室测试（吸水能力，比重，洛杉矶磨损值，总压碎值，总冲击值和10％的细度，片状指数和无限制的抗压强度）。岩石学分析表明，岩石（蒙脱石片麻岩，石英岩，花岗岩和方钠石）主要为酸性，富含石英长石矿物。岩石单元中的不透明矿物在0.6％至2.3％的范围内，其中细粒炭黑矿的最大值。岩石聚集体的比重在2.65和2.74之间。所有吸水量值均符合建议的吸水量标准值<2％。岩石的总压碎值在17.6％和28.4％之间，其中石英岩的最小值（17.60-18.40％）最小，而硅镁石片麻岩的最大值（27.70-28.40％）。总冲击值的范围在11.0％至19.0％之间，其中石英岩的最低值（11.0-11.6％），而霞石的最高值（18.4-19.0％）。其他性能包括洛杉矶磨损，10％细粉，易碎指数和无侧限抗压强度，分别为17.4-29.8％，96.96-131.63 kN，13和24.9和138.98-167.52 MPa。根据这项研究中岩石集料的物理和机械性能，石英岩和中粒花岗岩被认为最适合道路集料的生产，因为测试在一般道路集料目的可接受的范围内。斑状花岗岩，辉锰矿片麻岩和夏洛石岩显示出的结果大多数值在外部，在一般道路石料用途的可接受限度内或略微在可接受范围内。这项研究提供的岩土工程评估表明，并不是所有的前寒武纪基底岩石都能产生令人满意的骨料，可用作公路骨料。

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