摘要
开发岩土材料的环境影响及其相对较高的成本，再加上发展中国家的财政资本越来越低，正促使公路行为者转向廉价的当地生态材料。对喀麦隆西部地区Bandjoun(LGSB)红壤砾石土进行了研究。其目的是确定红壤砾石土，特别是班杰恩的红壤砾石土，考虑到其岩土参数和环境影响，是否可以作为公路建设中岩石集料的生态和经济替代。现场对这些土壤进行了描述，并在实验室进行了完整的岩土鉴定。LGSB的加州承载比指数为26%～83.3%，塑性指数为10.11%，细粉含量为12.05%，亚甲基蓝平均值为4.25，Proctor最佳含水量27.6%，干密度1.75 g/cm3.按公路研究委员会分类为A-2-7亚类粉质或粘土质砾石和砂；按《道路施工指南》分类为B级细砂和砾土；按桥梁和公路中心实验室分类为粉质砾石。这些土壤可自然用于路面层，特别是所有交通等级的路基和低交通等级的底基层。这些土壤的吨位估计为18389吨。全球变暖指数表明，在道路建设中使用这些土壤（18389 t）可以减少31,629-62,706 kg的碳排放。在公路建设中使用红土是一种非常有趣的替代方法，可以减少与岩石集料制造相关的环境影响。因此，为了更清洁、更环保的道路建设，应该使用红壤土代替岩石集料。本文对公路建设用红壤砾石土的岩土性质、生态影响及其生态和经济利用潜力进行了具体评价。
Abstract
The environmental impact of the exploitation of geomaterials and their relatively high cost, coupled with the increasingly low financial capital in developing countries, are pushing road actors to turn to inexpensive local ecological materials. The present study is conducted on lateritic graveled soils of Bandjoun (LGSB) in the West Cameroon Region. The aim is to determine whether lateritic gravel soils, particularly those in Bandjoun, can be an ecological and economical alternative to rock aggregates in road construction, considering their geotechnical parameters and environmental impact. These soils were described in the field and were also subjected to complete geotechnical identification in the laboratory. The LGSB presents Californian bearing ratio indices ranging from 26% to 83.3%, a plasticity index of 10.11%, a fines content of 12.05%, an average methylene blue value of 4.25, a water content at the Proctor optimum of 27.6% and a dry density of 1.75 g/cm3. They are silty or clayey gravels and sands of subgroup A-2-7 according to the Highway Research Board classification; sandy and gravelly soils with fines of class B according to the classification of the Road Construction Guide; and silty gravels according to the classification of the Central Laboratory of Bridges and Highways. These soils can be used naturally in pavement layers, in particular in subgrade for all traffic classes and in subbase for low traffic. The tonnage of these soils has been estimated at 18,389 t. The global warming index shows that the use of these soils (18,389 t) in road construction can reduce 31,629–62,706 kg of carbon emissions. The use of lateritic soils in road construction is a very interesting alternative to reduce the environmental impacts associated with the manufacture of rock aggregates. So, lateritic soils should be used instead of rock aggregates for cleaner, more environmentally friendly road construction. The present work presented a specific evaluation of the geotechnical properties and ecological impact of lateritic graveled soils for road construction, as well as their potential for ecological and economic utilization.
NETL
NSTL
Wiley