BEHAVIOUR OF MULTI-LAYERED GEOCELL REINFORCED BED SUBJECTED TO REPEATED LOAD
Published In: 4TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND CONSTRUCTION ENGINEERING
Author(s): ANDREW R. DAWSON , MAHMOUD K. MOHAMMED , OMID KHALAJ , SEYED NASER MOGHADDAS TAFRESHI
Abstract: This paper describes a series of the plate load tests performed in a test pit measuring 2000×2000 mm in plane and 700 mm in depth. To simulate traffic loadings, fifteen loading and unloading cycles were applied to the loading plate with amplitudes of 400 and 800 kPa. The optimum depth of the top most layer of geocell and the optimum vertical spacing of geocell layers, based on plate settlement, are both approximately 0.2 times loading plate diameter. The results show that installation of the geocell layers in the foundation bed decreases the accumulated plastic and total settlements of loading plate, in addition to increase its elastic settlement. Efficiency of geocell reinforcement was decreased by increasing the number of the geocell layers for all applied stress levels and number of cycles of applied loading. The results of the testing reveal the ability of the multiple layers of geocell reinforcement to ‘shakedown’ to a fully resilient behavior after a period of plastic settlement
- Publication Date: 19-Aug-2016
- DOI: 10.15224/978-1-63248-101-6-09
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DISTRIBUTION AND ORIENTATION OF STEEL FIBRES IN STEEL FIBRE REINFORCED CONCRETE
Published In: 4TH INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND CONSTRUCTION ENGINEERING
Author(s): AYMAN NASSIF , JOHN WILLIAMS , OLUBISI IGE , STEPHANIE BARNETT
Abstract: The use of fibres to reinforce brittle materials for better performance has been employed since time immemorial. Therefore, inclusion of steel fibres in concrete has always improved the post-cracking strength and concrete ductility to a large extent while full potential of steel fibre reinforced concrete (SFRC) is still yet to be exploited in practice. This study investigated the effects of fibre type, dosage and maximum aggregate size on distribution and orientation and hence, the flexural performance of steel fibre reinforced concrete. Hooked-end steel fibres with 50 mm and 60 mm length, aspect ratio of 45, 65 and 80, and dosages of 0 kg/m³, 25 kg/m³, 40 kg/m³, 50 kg/m³ and 60 kg/m³ were used with maximum sizes of coarse aggregate of 10mm and 20mm. X-ray Computed Tomography was employed for imaging cores taken from the slab specimens after testing. The experimental results show a remarkable improvements in flexural strength up to 83% observed at larger dosage of steel fibre and when
- Publication Date: 19-Aug-2016
- DOI: 10.15224/978-1-63248-101-6-10
- Views: 0
- Downloads: 0