Abstract
In this paper, a series of plate load tests on a sandy soil bed containing multiple layers of granulated rubber-soil mixture (RSM) under incremental cyclic loading was performed. To evaluate the settlement response and damping ratio of foundation bed, incremental cyclic loading in five steps with amplitudes of 140, 280, 420, 560 and 700 kPa were applied to the loading plate. The results show that both the total and residual settlements of the loading plate decrease with increase in the number of RSM layers, regardless of the level of applied cyclic load, but the rate of reduction in both settlements reduces with increase in the number of RSM layers. There is also an appreciable improvement in the value of the damping capacity with increase in the number of RSM layers as the damping ratio increases by 4-5% beyond the value of 12-15% obtained on untreated sand. On the basis of the study, the concept of using multiple RSM layers not only is a very attractive material to achieve less settlement and vibration attenuation for machine foundation and railway track beds, but also, the environmental impacts of waste tires are attenuated by using as composite materials in geotechnical applications.
Highlights
In last decades, due to developing industry and growing population, the huge volume of scrap tire has been generated in the world and their disposals have become a major environmental problem worldwide
The results show that both the total and residual settlements of the loading plate decrease with increase in the number of rubber-soil mixture (RSM) layers, regardless of the level of applied cyclic load, but the rate of reduction in both settlements reduces with increase in the number of RSM layers
This paper investigates the beneficial effect of RSM layers in a foundation bed which would have application, potentially, to roads, highways, embankments, machine foundations and pavement foundations
Summary
Due to developing industry and growing population, the huge volume of scrap tire has been generated in the world and their disposals have become a major environmental problem worldwide. Accumulated waste tires make them harder and more expensive to dispose of safely without threatening human health hazard and environment problems [1, 2]. Due to willingness to use alternative sources, the use of waste tires in the form of shreds, chips, strips, granules are considered as construction materials [3, 4]. The cyclic load response of rubber-soil mixtures has shown the well potential as a composite material, in applications in pavement, highways, and embankments [3, 4, 5]. The tire-chips in backfill soil, subjected to simulated repeated loads has been used in a laboratory model embankment [7]. The feasibility of using tire shred–sand mixtures as a fill material in embankment construction was investigated by Yoon [8]. All researchers reported the beneficial effect of rubber in mixture for use in geotechnical applications [4, 5, 9]
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