CBR strength of reinforced soil with natural fibres and considering environmental conditions

Sarbaz, Hossein; Ghiassian, H.; Heshmati, Ali

doi:10.1080/10298436.2013.770511

Cited by 46 publications

(13 citation statements)

References 10 publications

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“…Thus, it is possible to use the palm fibers as an alternative low-cost natural material for soil reinforcement. Adding to this, the date palm is one of the most cultivated tree crops in the world, with a distribution of around 100 million palms in 30 countries [4].…”

Section: Natural and Synthetic Fibers (Palm And Polypropylene Fibers)mentioning

confidence: 99%

“…Some properties of polypropylene fiber provided by the manufacturer are given in Table 3. According to previous researches such as [4,10], the contents of the palm and polypropylene fibers are chosen as 0.5%, 1.0%, and 1.5% by dry weight of soil. Hydrated lime as well as Portland cement is used as stabilizer in fine grained soils.…”

Section: Palm and Polypropylene Fibersmentioning

confidence: 99%

“…Reinforcement of soils with low-bearing capacity is an economical way to strengthen the earth for building purposes and to diminish the amount of soil exchanges [3]. In spite of the quantity of research conducted on the resultant characteristics of using different stabilizers for soil improvement, there are still no standard scientific outcomes or techniques and additional experimental data are necessary [4].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing of CBR Strength and Freeze–Thaw Performance of Silty Subgrade Using Three Reinforcement Categories

El-Maaty

2016

Civ Eng J

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Silty subgrade soil cannot satisfy the requirements of highway construction because of its low strength and durability problems. A wide range of reinforcements have been used to improve soil performance. Improving the soil properties has caused more interest in identifying new accessible resources for reinforcement. This paper investigates the effect of including different reinforcement types on reducing the rapid accumulation of pavement damage caused by freeze–thaw cycles or low strength of a silty pavement foundation. The improvement of CBR strength and freeze-thaw behavior was tested with the inclusion of three reinforcement categories: i) randomly distributed fibers (natural palm fibers and chemical polypropylene fibers), ii) chemical additives (lime and cement), and iii) waste or by-product materials (fly ash and silica fume). To represent unsaturated and saturated soil conditions for various field applications, both unsubmerged and submerged samples were investigated. Mass losses were also calculated after freezing–thawing cycles as criteria for durability behavior. The test results for the reinforced specimens were compared with unreinforced samples to clarify the effectiveness of each reinforcement type and content. Unsubmerged samples especially that reinforced with waste materials provided a significant improvement in CBR strength. For submerged conditions, the best performance was observed from the specimens treated with chemical additives. 10% of cement reinforcement and 20% of waste materials provide the highest resistance against the freeze–thaw cycles.

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Section: Natural and Synthetic Fibers (Palm And Polypropylene Fibers)mentioning

confidence: 99%

Section: Palm and Polypropylene Fibersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing of CBR Strength and Freeze–Thaw Performance of Silty Subgrade Using Three Reinforcement Categories

El-Maaty

2016

Civ Eng J

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“…Many past researches have conducted a test by including different types of fibre such as geo-fibre, jute, nylon, sisal fibre, kenaf fibre, palm fibre and many other types of fibre at different types of soil. They concluded that inclusion of the fibre in the soil increased the ductility, compressive strength, and moisture content, and reduced the maximum dry density of soil, increased tensile strength and enhanced the strength of the California Bearing Capacity (CBR) [17,[19][20][21][22]. Coir fibre is one of the natural fibres that is found to have a good strength characteristic and resistance to biodegradation over a long period of time [23].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Marine Clay Soil Using Lime and Alkaline Activation Stabilized with Inclusion of Treated Coir Fibre

et al. 2020

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Waste products have recently been used as one of the techniques in soil stabilization. The material is not just environmentally friendly, but also cheap. In this study, two different types of soil stabilizer—lime and alkaline activator (AA) with the inclusion of treated coir fibre as soil reinforcement in marine clay soil—were examined. The inclusion of fibre in the treated soil has had a positive impact in increasing the strength of the soil. Therefore, to assess the effectiveness of the soil treatment, mechanical tests such as indirect tensile strength, flexural test and unconfined compressive strength test were performed at three different curing periods (7, 28 and 90 days) on both untreated and treated soil. From the results, the inclusion of fibre in both lime and alkaline activation indicates an enhancement on post-peak behaviour from brittle to more ductile. Microstructural analyses of Field Emission Scanning Electron Microscope (FESEM) and Energy Dispersive X-ray (EDX) were also conducted after shearing to evaluate the changes of the soil before and after the treatment. Overall, results indicate that the treatment transformed the structure of the soil to become denser where it filled the large pores compared to untreated soil.

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“…Surface and subsurface drainage of road pavement and from adjoining land also affect significantly sub-grade strength [3].This gives a high importance on the effect of the soaking period on the CBR value of soil. Many researchers tried to increase the CBR of soaked clay by adding fibers [4] or by adding geogrids for the sub-grade [5]. The objective of this research paper is to find the reduction ratio of CBR value of clay relatively to a proposed number of soaking days.…”

Section: Introductionmentioning

confidence: 99%

Effect of Soaking Period of Clay on its California Bearing Ratio Value

Nini¹

2019

World Congress on Civil, Structural, and Environmental Engineering

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The quality of road pavement is affected mostly by the type of sub-grade which is acting as road foundation. The roads degradation is related to many factors especially the climatic conditions, the quality, and the thickness of the base materials. The thickness of this layer depends on its California Bearing Ratio (CBR) test value which by its turn is highly affected by the quantity of water infiltrated under the road after heavy rain. The capacity of the base material to drain out its water is predominant factor because any change in moisture content causes change in sub-grade strength. This paper studies the effect of the soaking period of soil especially clay on its CBR value. For this reason, we collected many clayey samples and on each soil, two groups of experiments were performed: main tests consisting of Proctor and CBR test from one side and from other side identification tests consisting of other tests such as Atterberg limits tests. Each soil sample was first subjected to Proctor test in order to find its optimum moisture content which will be used to perform the CBR test. Four CBR tests were performed on each soil with different soaking period. The first CBR was done without soaking the soil sample; the second one with two days soaking, the third one with four days soaking period and the last one was done under eight days soaking. By comparing the results of CBR tests performed with different soaking time, a more detailed understanding was given to the role of the water in reducing the CBR of soil. In fact, by extending the soaking period, the CBR was found to be reduced quickly the first two days and slower after. A precise reduction factor of the CBR in relation with soaking period was found at the end of this paper.

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CBR strength of reinforced soil with natural fibres and considering environmental conditions

Cited by 46 publications

References 10 publications

Enhancing of CBR Strength and Freeze–Thaw Performance of Silty Subgrade Using Three Reinforcement Categories

Enhancing of CBR Strength and Freeze–Thaw Performance of Silty Subgrade Using Three Reinforcement Categories

Improvement of Marine Clay Soil Using Lime and Alkaline Activation Stabilized with Inclusion of Treated Coir Fibre

Effect of Soaking Period of Clay on its California Bearing Ratio Value

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