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Discussion of "compaction and strength behavior of tire crumbles-fly ash mixed with clay" by Akash Priyadarshee, Arvind Kumar, Deepak Gupta, and Pankaj Pushkarna
journal contributionposted on 10.09.2019, 00:00 by A Soltani, Mehdi MirzababaeiMehdi Mirzababaei
The dimensional analysis concept was successfully extended to the clay–tire crumbles–fly ash CBR problem, thereby leading to the development of a simple and practical dimensional model capable of predicting the CBR (at both unsoaked and soaked conditions) as a function of the mixture’s basic index properties, i.e., stabilizer content, initial placement (or compaction) condition, specific surface area, grain-size distribution, and curing time. The predictive capacity of the proposed dimensional model was examined and further validated by statistical techniques. The proposed dimensional model contains a total of four model (or fitting) parameters, which can be calibrated with little experimental effort and further implemented for predictive purposes. The model parameters can be adequately estimated by a total of four unsoaked or soaked CBR tests. Four scenarios consisting of the clay soil with no additives, a desired clay–tire crumbles mixture (no fly ash), a desired clay–fly ash mixture (no tire crumbles), and a desired clay–tire crumbles–fly ash mixture are recommended for the calibration phase. The choice of tire crumbles and fly ash contents are arbitrary; however, from a statistical perspective, median contents are expected to yield a more reliable estimate of the model parameters (Mirzababaei et al. 2018).