GEOTECHNICAL PROPERTIES AND AGGREGATE QUALITY ASSESSMENT OF MARL DEPOSIT IN AFIKPO AREA, SOUTHEASTERN NIGERIA

Journal of Applied Geographical Studies Pub Date : 2021-06-22 DOI:10.47941/jags.592

E. U. Sunday, B. J. Owonaro, O. C. Okeke, C. Amadi, S. Okonkwo, J. I. Ofoh, P. O. Iwuoha

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Abstract

Purpose: Marl is an impure limestone that is generally not good for cement production because of its low calcium carbonate content. Aggregates derived from marl deposit in Afikpo Area, Southeastern Nigeria, are currently being used in construction of concrete structures and highway pavements by construction companies and individuals. There is no published information on the suitability of the aggregates for such uses. The purpose of this study was to determine the suitability of the aggregates as components of concrete and highway pavements in terms of satisfying the non-swelling and acceptable strength characteristics / requirements. Methodology: Geotechnical tests including Atterberg limits (liquid limit, plastic limits and plasticity index), linear shrinkage and free swell were used to evaluate the swelling characteristics; while physico- mechanical tests including specific gravity, water absorption. Aggregate Crushing Values (ACV), Aggregate Impact Value (AIV) and Los Angele Abrasion Value (LAAV) were used to evaluate the strength characteristics. The field studies indicate that the marl deposit is associated with Ezeaku Formation of Lower Benue Trough. Results: Results of geotechnical tests indicate liquid limit, plasticity index, linear shrinkage and free swell values of 29.50%, 4.60%, 0.36% and 10.00%, respectively. Similarly, results of physico-mechanical tests indicate specific gravity, water absorption, ACV, AIV and LAAV values of 2.58%, 1.90%. 23.50% 29.45% and 42.70%, respectively. Unique contribution to theory, practice and policy: Since the results satisfy the non-swelling characteristics (plasticity index < 12%, linear shrinkage < 8% and free swell < 50%) and acceptable strength characteristics (water absorption < 3%, ACV < 30%, AIV < 30% and LAAV < 45%) requirements for good concrete and highway pavement aggregates, aggregates derived from marl deposit in Afikpo Area, Southeastern Nigeria, are strongly recommended to be used as aggregates in concrete and highway pavement construction.

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尼日利亚东南部afikpo地区泥灰岩矿床的岩土特性和总体质量评价

用途:灰泥是一种不纯的石灰石，由于碳酸钙含量低，通常不适用于水泥生产。目前，建筑公司和个人正在使用尼日利亚东南部Afikpo地区泥灰岩沉积物的骨料建造混凝土结构和公路路面。没有关于这种用途的聚合体的适宜性的公开资料。本研究的目的是确定骨料作为混凝土和公路路面组成部分的适用性，以满足不膨胀和可接受的强度特性/要求。方法:采用阿特伯格极限(液限、塑性极限和塑性指数)、线性收缩和自由膨胀等岩土试验评价膨胀特性;而物理力学试验包括比重、吸水率等。采用骨料破碎值(ACV)、骨料冲击值(AIV)和洛杉矶磨损值(LAAV)对强度特性进行评价。野外研究表明，泥灰岩沉积与下贝努埃海槽埃泽阿库组有关。结果:岩土力学试验结果表明，液限值为29.50%，塑性指数为4.60%，线收缩率为0.36%，自由膨胀率为10.00%。同样，物理力学试验结果表明，比重、吸水率、ACV、AIV和LAAV值分别为2.58%、1.90%。分别为23.50%、29.45%和42.70%。对理论、实践和政策的独特贡献:由于结果满足良好混凝土和公路路面集料的非膨胀特性(塑性指数< 12%，线收缩率< 8%，自由膨胀< 50%)和可接受的强度特性(吸水率< 3%，ACV < 30%， AIV < 30%， LAAV < 45%)要求，因此强烈建议使用尼日利亚东南部Afikpo地区泥灰岩沉积物的集料作为混凝土和公路路面施工中的集料。

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Journal of Applied Geographical Studies

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