Dynamic CBR Test to Assess the Soil Compaction

Zabielska-Adamska, Katarzyna; Sulewska, Maria Jolanta

doi:10.1520/jte20130256

Cited by 22 publications

(14 citation statements)

References 9 publications

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“…The mechanical parameters and hydraulic conductivity of fly ash depend strictly on the moisture content at compaction (ZabielskaAdamska, 2011;Zabielska-Adamska and Sulewska, 2015).…”

Section: Introductionmentioning

confidence: 99%

One-dimensional compression and swelling of compacted fly ash

Zabielska-Adamska

2018

Geotechnical Research

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The aim of the paper is to prove that the compressibility and swelling of compacted fly ash in both unsaturated and fully saturated conditions are dependent on the moisture content at the compaction and on the compaction energy, as in the case of cohesive soils. The studies have been conducted on samples compacted at various water contents in conventional oedometers and the Rowe hydraulic consolidation cell and in California bearing ratio moulds (swelling tests). The one-dimensional compressibility of saturated fly ash is much higher than that of unsaturated fly ash. Deformation of unsaturated samples increases with moisture at compaction, and the samples compacted with greater effort are less compressible. The consolidation of the saturated samples decreases with their moisture content at compaction and at the reduction of the compaction energy. The swelling of ash samples decreases as the moisture during compaction increases and when compaction energy is lower. The highest swelling was obtained for the fly ash with the highest optimum water content.

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“…The mechanical parameters and hydraulic conductivity of fly ash depend strictly on the moisture content at compaction (ZabielskaAdamska, 2011;Zabielska-Adamska and Sulewska, 2015).…”

Section: Introductionmentioning

confidence: 99%

One-dimensional compression and swelling of compacted fly ash

Zabielska-Adamska

2018

Geotechnical Research

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“…The CBR method is still used as the basic method of pavement design in many countries or even as the recommended method for characterizing subgrades [21]. CBR values are closely connected with the characteristics of compaction, so the CBR test can be used as a method of earth work assessment [7].…”

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confidence: 99%

“…Non-plastic silty soils behave like pure sands. Soils macroscopically evaluated as non-cohesive and not demonstrating plasticity may however exhibit properties of cohesive soils, with changes occurring not only in strength characteristics but also in deformation and filtration, which was found in the example of fly ash [6][7][8]. The phenomenon of cohesion resistance in non-cohesive soils is the result of suction in the soil, which is often associated with capillary suction.…”

Section: Introductionmentioning

confidence: 99%

“…The authors' earlier work [6][7][8] has shown that compacted non-plastic fly ash should always be evaluated considering the moisture content at compaction, as in the case of cohesive soils. The aim of the work is to show how the variable content of fine particles in fly ash influences the diversification of its mechanical parameters, which will be shown in the example of the California Bearing Ratio (CBR) of ash as a parameter that is strictly dependent on the initial compaction [6,7]. The obtained results will be helpful in the assessment of fly ash for use in earth construction.…”

Section: Introductionmentioning

confidence: 99%

“…The author's research [6][7][8] has shown that compacted fly ash, despite the macroscopic similarity to non-cohesive soils, should always be assessed taking into account the moisture content at compaction (at a given compaction effort) as with compacted cohesive soils; not only providing the value of the compaction index, because all specified mechanical parameters and hydraulic conductivity are strictly dependent on the moisture content of the fly ash at compaction.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Compacted Fly Ash as a Transitional Soil

Zabielska-Adamska

2020

Materials

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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.

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