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Soil Stabilization Using Bitumen Emulsion and Cement Combination as Additive

Journal of Earth Science and Engineering 2018年第2期8卷 66-74页

作者： ayininuola gbenga matthew ABIDOYE Shola Paul Department of Civil Engineering University of IbadanIbadan 200284Nigeria

This study examined effect of stabilising lateritic soil with combination of bitumen emulsion and cement.Soil samples were obtained from borrow pits located in Kwali Area Council in Abuja.Three percentages of additives were considered:4%,6%and 8%.The bitumen emulsion and cement contents were combined in percentages:100:0,75:25,50:50,25:75 and 0:100 to form five additives.The stabilized soils and unstabilized soils(control)geotechnical properties such as Unconfined Compressive Strength(UCS)test and California Bearing Ration(CBR)test were determined.The UCS and CBR for soil samples A and B were 0.46 MPa and 19.6%,0.95 MPa and 22.6%,respectively.The CBR of soil A at 4%additives of mix proportions 100%/0%,75%/25%,50%/50%,25%/75%and 0%/100%were 49.1%,68.8%,140.5%,172.1%and 218.5%,respectively.The corresponding values for UCS were 0.64,0.66,1.21,1.27 and 1.33.While for 8%additives the CBR for soil B were 78.4%,88.4%,180.5%,224.2%,288.1%and UCS were 0.48,0.68,1.50,2.16 and 2.45,respectively.It was observed that both the UCS and CBR values increased as the cement component increased for both soil samples.Stabilising laterite with mixture of bitumen emulsion and cement improved the strength of the soil.

关键词： Stabilization unconfined compressive strength test California bearing ratio moisture contents bitumen emulsion

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Geotechnical Properties of Flax Fiber Stabilized Soil

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Journal of Earth Science and Engineering 2018年第2期8卷 75-82页

作者： gbenga matthew ayininuola Edidiong Godwin Udoh Department of Civil Engineering University of IbadanIbadan 200284Nigeria

Engineers are often faced with the challenge of constructing with or on soils with poor strength that could pose challenges during the construction phase and service life of the facility.For better results,the geotechnical properties of the soil have to be improved.This study focused on the effect of flax fiber on the geotechnical properties of the soil.The soil samples were obtained from borrow pits within the University of Ibadan,Ibadan,Nigeria.The geotechnical properties CBR(California Bearing Ratio)and UCS(Unconfined Compressive Strength)of the natural soils among others were determined in accordance with BS 1377.Flax fibers of 0.3%,0.6%,0.9%,1.2%,and 1.5%by weight were added to the subsoil.The mixtures geotechnical properties were measured.The results showed that the addition of flax fiber led to increase in the soil CBR from 3.1%to 15%and also its UCS witnessed tremendous increase.The soil maximum CBR and UCS were attained at optimum flax fiber content of 1.2%.

关键词： Soil stabilization flax fiber CBR UCS.

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