Durability of nanostructured biomasses ash (NBA) stabilized expansive soils for pavement foundation

Onyelowe, Kennedy C.; Duc, B. V.

doi:10.1080/19386362.2017.1422909

Cited by 30 publications

(6 citation statements)

References 20 publications

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“…These classifications, coupled with the low values of Maximum Dry Density, Unconfined Compressive Strength and CBR recorded, show that the soil falls below the standard recommendation for most geotechnical construction works. Especially for sub-base or base courses in highway construction [2,11,13,33,35,39,40].…”

Section: Resultsmentioning

confidence: 99%

Effect of Metakaolin on Strength Properties of Lateritic Soil Intended for Use as Road Construction Material

Abdulkarim

Umar

Muhammed

et al. 2022

PoS

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An excellent all-weather road is essential in providing reliable transportation services that comprise social and economic development elements. However, in most cases, the road has to be constructed on a soft foundation soil where large deformations usually occur, which causes increases in maintenance costs and leads to interruption of traffic service, especially during the wet season. It is necessary to stabilize or improve the in-situ soils. This study explores the potential of using metakaolin to improve the geotechnical properties of lateritic soil for road construction materials. The soil classifies as A-6(4) and CL according to the American Association of State Highway and Transport Officials and the Unified Soil Classification System. The soil was treated with 5, 17.5 and 30 % concentrations of metakaolin by dry weight and was compacted using three compaction energies: British Standard Light (BSL), West African Standard (WAS) and British Standard Heavy (BSH). California Bearing Ratio (CBR) and Unconfined Compressive Strength (UCS) tests were carried out to evaluate the effect of metakaolin on the soil investigated. Results showed a general improvement in the engineering properties of the soil with an increase in metakaolin content, particularly when compacted at the BSH energy level. However, the results did not meet the 1500-3000 kN/m 2 7 days UCS criterion stipulated by the Nigerian General Specification for road base courses. However, 30 % lateritic soil/metakaolin blended soil compacted using WAS and BSH energy levels suffice for use as sub-base in road construction, having met the 750-1500 kN/m 2 7 days UCS criterion stipulated by the Nigerian General Specification. The Peak CBR value for the treated soil, compacted using the three energy levels of BSL, WAS, and BSH, occurred at 30 % metakaolin concentration with corresponding soaked CBR values of 17, 23 and 31 %. The Nigerian General Specification recommends a nominal strength criterion of a soaked CBR value of 30 and 80 % to be attained by material to be used as subbase and base course in road construction. Based on the above criterion, only the 30 % metakaolin treated blend compacted at the BSH energy level met the 30 % requirement for sub-base materials.

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Section: Resultsmentioning

confidence: 99%

Effect of Metakaolin on Strength Properties of Lateritic Soil Intended for Use as Road Construction Material

Abdulkarim

Umar

Muhammed

et al. 2022

PoS

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“…The presence of the binary mixture in the treated soft clay within clay increases its shear strength. The increment of shear strength is attributed to the physicochemical and highly pozzolanic properties of the admixtures and the reduction of the plasticity index, which might make the mixture with clay content behave like granular soil (Figure 10), as mentioned by Onyelowe and Duc [91] by referring it to the reduction of water content and pozzolanic reactions. This encourages stabilization and the physical properties of POFA and gypsum, which are coarser than kaolin particles.…”

Section: Shear Strength With Percentages Of the Stabilizing Agentsmentioning

confidence: 91%

The Effect of POFA-Gypsum Binary Mixture Replacement on the Performance of Mechanical and Microstructural Properties Enhancements of Clays

et al. 2022

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Soft clay is categorized as problematic due to its weak and dispersive properties which requires stabilization. In Malaysia, there is another challenge, the increment of palm oil waste productions to meet the global demand for food oil. These two concerns motivate engineers to develop novel strategies for exploiting palm oil waste in soil stabilization. Utilizing POFA as a soil stabilizing agent is an economical and sustainable option due to that POFA contains high pozzolanic characteristics which make it more suitable and reliable to treat soft soil. This study uses the replacement portion of the soil with stabilizing agents -POFA and Gypsum; aiming to achieve Malaysia green technology goals by the balance of the economic expansion and environmental privilege. However, the aim of this study is to determine the effect of POFA-gypsum binary mixture replacement on the performance of mechanical and microstructural properties en-hancements of clays. Kaolin S300 is the control sample whereas POFA and gypsum are the used binders. The mechanical properties and shear strength with the curing period were tested. Results showed that treated clay marked increment of optimum water contents and reduction of maximum dry densities, a clear 200% of enhancement of treated clay’s compressive and shear strength with curing period as well as the amount of stabilizing agent to less than 15% of POFA and 6% of POFA. It is also found that as gypsum contains a high amount of lime (CaO), the results illustrate that strength raises significantly even with less curing time due to its high reactivity compared to silica and alu-mina. Overall, the results show an enhancement of mechanical and shear strength properties of treated kaolin supported by microstructural SEM imaging.

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“…Experts have applied various materials to improve the strength, density and durability of soil while lowering CO 2 emissions. Such materials include oyster shell powder, quarry dust, snail shell dust, sawdust, crushed ceramics, crushed glasses, crushed plastics and fly ash respectively [15,16,17,18,19,20,21,22,23]. Other possible alternatives are the use of alkali-activated binders using industrial by-products comprising silicate materials [24,25].…”

Section: Introductionmentioning

confidence: 99%

Study on the Stabilization of a New Type of Waste Solidifying Agent for Soft Soil

Shen

Chen

et al. 2019

Materials

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The use of desulfurization gypsum and steel/furnace slag composite cementitious material (DGSC) to solidify soft soil can fully utilize industrial wastes, reduce cement use and protect natural resources. By studying the unconfined compressive strengths of DGSC-solidified soil with different mix ratios, water-binder ratios and curing periods, the influence of those factors on the unconfined compressive strength of the soil can be analyzed. Furthermore, the quasi-water-cement ratio is introduced to predict the strength of the DGSC-solidified soil. The results show that the higher the DGSC content is, the better its effect on the soft soil. The variation in the unconfined compressive strength of DGSC-solidified soil overtime can be described by the same trend as that of cement-solidified soil but its early strength is lower than that of cement-solidified soil. When the water-binder ratio of the DGSC-solidified soil is the same as that of the cement-solidified soil, after a28-day curing period, the content of DGSC is higher than that of the 5% cement content, so the DGSC solidification effect is comparable to that of cement. Therefore, using DGSC instead of cement as a soft soil solidifying agent can meet the strength requirements of solidified soil.

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Durability of nanostructured biomasses ash (NBA) stabilized expansive soils for pavement foundation

Cited by 30 publications

References 20 publications

Effect of Metakaolin on Strength Properties of Lateritic Soil Intended for Use as Road Construction Material

Effect of Metakaolin on Strength Properties of Lateritic Soil Intended for Use as Road Construction Material

The Effect of POFA-Gypsum Binary Mixture Replacement on the Performance of Mechanical and Microstructural Properties Enhancements of Clays

Study on the Stabilization of a New Type of Waste Solidifying Agent for Soft Soil

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