Response Surface Method Analysis of Chemically Stabilized Fiber-Reinforced Soil

Abstract

One of the significant issues persisting in the study of soil stabilization is the establishment of the optimum proportions of the quantity of stabilizer to be added to the soil. Determining optimum solutions or the most feasible remedies for the utilization of stabilizing products in terms of their dose rates has become a significant concern in major civil engineering design projects. Using the response surface methodology, this study primarily focused on investigating the optimal levels of reinforcement fiber length (FL), fiber dosage (FD), and curing time (CT) for geotechnical parameters of stabilized soil. To realize this objective, an experimental study was undertaken on the California bearing ratio (CBR) and unconfined compressive strength (UCS). Hydraulic conductivity (HC) tests were also performed, with stabilizer proportions of 6–12 mm for the FL and 0.2–0.6% for the FD calculated for the total dry weight of soil and 6% lime (total weight of dry soil). The curing times used for testing were 0, 7, and 14 days for the CBR tests; 60, 210, and 360 days for the UCS tests; and 7, 17, and 28 days for the HC tests. All practical experiments were conducted with experimental techniques using stabilizer proportions and curing times. The FL, FD, CT, CBR, UCS, and HC response factors were determined using the central composite design. The results point toward a statistically significant model constructed (p ≤ 0.05) using the analysis of variance. The results from this optimization procedure show that the optimal values for the FL, FD, and CT were 11.1 mm, 0.5%, and 13.2 days, respectively, as these provided the maximum values for the CBR; 11.7 mm for the FL, 0.3% for the FD, and 160 days for the CT corresponded to the maximum values for the UCS; and 10.5 mm for the FL, 0.5% for the FD, and 15 days for the CT led to the minimum value for the HC. In practice, the suggested values may be useful for experiments, especially for preliminary assessments prior to stabilization.

Correlation-Based Studies on Resilient Modulus Values for Fiber-Reinforced Lime-Blended Clay

“…Dosages of fibers were kept at 0.2% and 0.6% (by dry weight of soil). Fiber dosages (0.2% and 0.6%) were found to satisfy the workability requirements from earlier studies [4,6,[38][39][40], also fibers being voluminous material(s), any dosage beyond 0.6% will compromise the workability characteristics affecting the resultant density and saturated hydraulic conductivity characteristics [41][42][43]. Gupta et al [20] have reported 0.5% of fiber as the optimum content to enhance the stiffness and strength characteristics of cohesive soils.…”

Synthesis, characterization, and antioxidant activity in vitro of selenium-Euryale ferox Salisb. polysaccharide

“…In the light of the results of single factor investigation, three levels were selected from the three factors, shown in Table 1. Box-Behnken design was used to carry out response surface optimization by Design-Expert 7.0 software (Stat-Ease, USA) [25][26][27].…”

Study of the Mechanical and Microscopic Properties of Modified Silty Clay under Freeze-Thaw Cycles

“…Silica fume (SF) and polypropylene (PP) have been shown to be effective at reinforcing soils and show promise in environmentally friendly road work applications [23]. Almajed et al [24] investigated the optimal levels of reinforcement fiber length (FL), fiber dosage (FD), and curing time (CT) for geotechnical parameters of stabilized soil and pointed optimal values of these indicators.…”