Objectives: To determine the strength and swelling behavior of black cotton soil (expansive soil) using a shredded rubber tyre as an additive. Methods: Series of unconfined compressive strength and California Bearing Ratio (CBR) tests were carried out on black cotton soil mixed with 0%, 5%, 10%, and 15% of shredded rubber tyres, and the results were compared with untreated soil samples. The study also investigated the influence of shredded rubber on swelling characteristics of black cotton soil by performing the swelling pressure test. Findings: From the experimental results, it is inferred that the optimum addition of a 10% shredded rubber tyre can effectively improve the strength behavior of black cotton soil. The unconfined compressive strength and California Bearing Ratio (CBR) of soil stabilized with 10% of shredded rubber tyre increased by 32 % and 49.3% respectively as compared to the untreated soil. An illustration presented shows the effect of increased CBR in terms of the reduction of 18% pavement thickness. This may reduce the total cost of the project. The present study also investigated the swelling potential of Black cotton soil and it is found to be decreased by 33.33% for the addition of 15% shredded rubber soil as compared to untreated soil. Novelty: The use of shredded rubber in expansive soil increased its CBR value, leading to a reduction in 18% of pavement thickness. Hence, it may lead to a further reduction in the total cost of the project. Also, the disposal problem of waste rubber tyres is resolved up to a certain extent.
Ferrocement is a composite used as a construction material. For any construction material, one of the crucial parameters considered during design is flexural and impact strength. This study’s objective was to look at how ribbed ferrocement panels behave when subjected to flexural and impact loads. The goal of this work was to determine how panel thickness and volume proportion of mesh affect the flexural and impact strength of ribbed ferrocement panels through an experimental and analytical programme. The experimental work consists of the preparation of ferrocement panels with 20mm, 30mm, and 40 mm thicknesses. For the preparation of the specimens, a matrix with a strength of 40 MPa and a mix proportion of cement and sand was 1:1.75 with a water-cement ratio of 0.40 was utilized. The specimens were reinforced with welded square wire mesh for a volume proportion of mesh between 1.5% to 2% for different sizes. These specimens were tested under two-point flexural loading and drop-weight impact loading. The ANSYS 16.0 programme was utilized for the analytical work to compare the experimental results by evaluating the deformation and equivalent stresses. The findings of this investigation show that specimen flexural and impact strength increased along with a rise in the panel thickness as mesh volume proportions increased. For flexural and impact loading, ribs provide adequate stiffness and skeletal steel provides good ductility as compared to those without rib specimens. The experimental findings were compared to the analytical work results and exhibited good agreement.
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