Zabielska-Adamska Katarzyna
Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, 15-351 Bialystok, Poland.
Materials (Basel). 2020 Mar 19;13(6):1387. doi: 10.3390/ma13061387.
Cohesive and non-cohesive soils show a number of properties typical of a given category. Cohesive soils are characterized by cohesion, and the properties of compacted soils closely depend on moisture at compaction. However, many researchers have found the existence of so-called mixed or transitional soils. Compacted transitional soils, macroscopically recognized as non-cohesive, are characterized by mechanical properties and hydraulic conductivity which are strictly dependent on the moisture content at compaction. The aim of this work is to show the influence of the content of fine particles in fly ash on the variation of California Bearing Ratio (CBR) values as a parameter strictly dependent on initial compaction. The CBR values were interpreted in terms of moisture at compaction, void ratio and intergranular void ratio. Three different research samples were selected with fine contents of 45%, 55% and 70%; all samples corresponded in terms of grading with sandy silt. Fly ash containing only non-plastic fines behaved as cohesive soils despite the lack of plasticity. The CBR values decreased with increasing moisture at compaction or void ratio. The CBR values, plotted as a function of the intergranular void ratio, have lower penetration resistance together with fine content.
黏性土和无黏性土具有一系列特定类型的典型特性。黏性土的特点是具有黏聚力，压实土的性质很大程度上取决于压实过程中的含水量。然而，许多研究人员发现了所谓的混合土或过渡土的存在。宏观上被视为无黏性的压实过渡土，其力学性质和水力传导率严格取决于压实过程中的含水量。这项工作的目的是展示粉煤灰中细颗粒含量对加州承载比（CBR）值变化的影响，CBR值是一个严格依赖于初始压实的参数。CBR值根据压实含水量、孔隙比和粒间孔隙比进行解释。选取了三种不同的研究样本，细颗粒含量分别为45%、55%和70%；所有样本在级配方面均对应于粉质砂土。仅含有非塑性细颗粒的粉煤灰尽管缺乏塑性，但表现得像黏性土。CBR值随压实含水量或孔隙比的增加而降低。绘制为粒间孔隙比函数的CBR值，随着细颗粒含量的增加，抗穿透性较低。
