Study of chemical-mineralogical properties of modified soils with polymers addition

Patrício, Jonny Dantas; Rodrigues, John Kennedy Guedes; Lucena, Lêda Christiane de Figueiredo Lopes

doi:10.1051/e3sconf/20160920001

Cited by 2 publications

(2 citation statements)

References 1 publication

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“…The SEM images of the compacted mixtures are shown in Figure 7. Those of 100% BCS and 100% RAP are similar to the SEM images of clay presented by Patricio et al (2016) and Mohanty et al (2016), and the SEM images of RAP presented by Hoy et al (2016), Paige-Green (2010) and Dulaimi et al (2016). The microstructure of the compacted specimen of 100% BCS shows fine crystals of particles with visible cracks as observed by Paige-Green (2010).…”

Section: Scanning Electron Microscopy (Sem) Of the Compacted Mixturessupporting

confidence: 84%

Effect of Reclaimed Asphalt Pavement Stabilization on the Microstructure and Strength of Black Cotton Soil

Alhaji¹,

Alhassan²

2018

IJTech

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Black Cotton Soil (BCS) collected from Guyuk, Adamawa State-Northeastern Nigeria, was treated with 0 to 100% Reclaimed Asphalt Pavement (RAP) in 10% steps to evaluate the microstructure and strength of the compacted mixtures. The index property results show that the BCS and RAP are classified under clay of high plasticity (CH) and poorly graded sand (SP) respectively, according to the Unified Soil Classification System (USCS). An extraction test gave a RAP bitumen content of 5.99%, which is within the value of 5-6% recommended in the literature. An x-ray diffraction test carried out on both the BCS and RAP showed that the BCS predominantly consisted of quartz, microcline, albite and kaolinite, which is similar to the results obtained in the literature, while the RAP, however, consisted of quartz, albite, orthoclase, phylogopite and actinolite, which is slightly different to what is reported in the literature, probably due to the source of the bitumen. The results of compaction, at a modified energy level, conducted on the mixtures, show that the Maximum Dry Density (MDD) increased from 1.890 to 2.034 mg/m 3 at 30% RAP content, after which the value fell to1.925 mg/m 3 at 100% RAP content. The Optimum Moisture Content (OMC) however, decreased from 13.7% at 0% RAP, to 8.8% at between 40-60% RAP content, after which the value increased marginally to 9.5% at 90% RAP. Similar to the MDD, the California Bearing Ratio (CBR) increased from 11% at 0% RAP to a maximum of 35% at 30% RAP content, after which the value fell to 5% at 100% RAP content. 30% RAP is therefore the optimal mixture giving the highest strength and can be used as a sub-base material for roads with light traffic use, according to the Nigerian General Specification for Road and Bridge Works. Hence the 3.07% bitumen obtained for this mixture can be adopted as the fixation point for BCS-RAP mixtures. Durability was found to be far lower than the resistance to loss in strength of 80% suggested in the literature.

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Section: Scanning Electron Microscopy (Sem) Of the Compacted Mixturessupporting

confidence: 84%

Effect of Reclaimed Asphalt Pavement Stabilization on the Microstructure and Strength of Black Cotton Soil

Alhaji¹,

Alhassan²

2018

IJTech

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“…The SEM of the compacted mixtures of RAP and BCS are shown in Figs. 6 to 11.These pictures are similar to the SEM pictures of clay presented by Patricio et al [35], Mohanty et al [36], Muhmed and Wanatowski [37], and SEM pictures of RAP presented by Hoy et al [32], Wu and Zong [31], Du [38] and Paige-Green [39].…”

Section: Scanning Electron Microscopy (Sem) Of Compacted Mixturessupporting

confidence: 77%

Free Swelling and Modulus of Elasticity of Compacted Black Cotton Soil Treated with Reclaimed Asphalt Pavement

Alhaji

Alhassan

2018

The Egyptian International Journal of Engineering Sciences and

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Black Cotton Soil (BCS), collected from Numan, in north-eastern region of Nigeria was stabilized with Reclaimed Asphalt Pavement (RAP), collected from failed road surface, along Minna-Bida road in Niger state Nigeria. The BCS was replaced with RAP at 0%, 10%, 20%, to 100% by weight of the soil. X-ray diffraction test on the BCS revealed predominantly, presence of quartz, microcline, albite and kaolinite, while that of RAP shows quartz, albite, orthoclase, phylogopite and actinolite. Maximum Dry Density (MDD) of the mixtures increased from 1890kg/m 3 at 0% RAP content to maximum value of 2036kg/m 3 at 30% RAP, after which the value reduced to 1925kg/m 3 at 100% RAP. Scanning Electron Microscopy showed fewer cracks in mixture with 20 and 30% RAP contents, rather an interlocking of particles of different sizes in a very dense state was revealed. Unconfined Compressive Strength (UCS) increased from 392kN/m 2 at 0% RAP to 947kN/m 2 at 30% RAP content, representing 58.6% increase. The values, thereafter, reduced to 17.5kN/m 2 at 100% RAP content. Modulus of Elasticity increased from 10.4Mpa at 0% RAP to 42.5MPa at 30% RAP, representing 75.5% increase. The values, thereafter, reduced to 2.9MPa at 100% RAP content. The swelling potential of the mixtures reduced from medium at 0% RAP content to low at 30% RAP content.

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Study of chemical-mineralogical properties of modified soils with polymers addition

Cited by 2 publications

References 1 publication

Effect of Reclaimed Asphalt Pavement Stabilization on the Microstructure and Strength of Black Cotton Soil

Effect of Reclaimed Asphalt Pavement Stabilization on the Microstructure and Strength of Black Cotton Soil

Free Swelling and Modulus of Elasticity of Compacted Black Cotton Soil Treated with Reclaimed Asphalt Pavement

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