石灰稳定立方体白蚁丘土作为可持续路面亚基层的结构性能评价

L. Ahouet, Sylvain Ndinga Okina, Adolphe Ekouya, F. Taillandier
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摘要

可直接用于道路次基层而无需准备的道路材料的稀缺性导致了非常规材料的使用。本研究在实验室试验的基础上,描述了水合石灰处理立方体白蚁丘土用于道路建设的可行性。在不同石灰掺量(0%、3%、5%、6%、7%、9%)条件下,进行了阿特贝格极限、干密度、CBR、抗压强度、静模量和交通沉降试验。结果表明:土-石灰混合料的力学性能在石灰固定点为6%前有所改善,石灰固定点在6%以上后力学性能下降。车辙处的交通模拟表明,对于6%石灰混合料,在20000次循环中出现微裂缝,平均沉降为2mm。在车轮通过所产生的应力下,颗粒之间的摩擦减少了土-石灰混合物的机械结合。材料的刚度导致诱发板效应,这使材料在炎热天气下表现良好,没有应变或车辙。土-石灰混合料在凝结过程中的机械连接减少了颗粒在车轮产生的应力下的摩擦。石灰将细颗粒焊接成更大的、或多或少不透水的表面颗粒,这减少了材料的磨损,而磨损是导致路面恶化的主要原因。最佳配合比可作为低流量土路(T1 < 300)和路堤上部处理的次基层或磨损层。所有这些结果都得到了x射线衍射(XRD)和扫描电镜(SEM)分析的证实。
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Evaluation of the Structural Performance of Lime-Stabilized cubitermes sp Termite Mound Soil as a Sub-Base Layer for Sustainable Pavements
The scarcity of road materials that can be used directly in the sub-base layer of a road without preparation has led to the use of non-conventional materials. This study describes the feasibility of using hydrated lime-treated cubitermes sp termite mound soils for road construction, based on laboratory tests. Tests of Atterberg limits, dry density, CBR, compressive strength, static modulus and measurement of sinking of the material under traffic were carried out with different proportions of lime (0%, 3%, 5%, 6%, 7%, 9%). The results obtained show that the mechanical properties of soil-lime mixtures improve up to the point of lime fixation at 6% and that above 6% lime, the mechanical properties decrease. The traffic simulation at the rut shows that for the 6% lime mix, microcracks appear from 20.000 cycles and that the average settlement is 2 mm. The friction of the grains under the stresses developed by the passage of the wheel reduces the mechanical bonds of the soil-lime mixture. The rigidity of the material leads to the induced slab effect, which gives the material good behavior in hot weather, without strain or rutting. The mechanical connections during the setting of the soil-lime mixture reduce the friction of the grains under the stresses developed by the wheel. Lime welds the fines into much larger, more or less impermeable particles on the surface, which reduces the crumbling of the material by attrition, a major cause of pavement deterioration. The optimal mix can be used as a sub-base layer or wearing course for low-traffic earth roads (T1 < 300) and for the treatment of the upper parts of embankments. All these results are consolidated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses.
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