Experimental study on engineering properties of fiber-stabilized carbide-slag-solidified soil

Abstract

Carbide slag has been used to prepare solidified soil to effectively reduce the stacking and disposal of carbide slag and achieve efficient resource utilization. Because of the significant brittleness and low strength of carbide-slag-stabilized soil, fibers were added to carbide-slag-stabilized soil in this experimental study. The effects of fiber length and fiber content on the unconfined compressive and indirect tensile strengths of carbide-slag-stabilized soil were investigated. The concepts of the density of fibers in solidified soil and the number of fibers in a unit volume solidified soil were proposed, and the effects of fiber distribution density on the mechanical properties of the solidified soil were evaluated. The fibers increased the indirect tensile strength of the carbide-slag-solidified soil, which was significantly higher than the unconfined compressive strength of the solidified soil. The fibers had no significant effect on the unconfined compressive and indirect tensile strengths of the 7 d carbide-slag-solidified soil but increased those of the 28 d carbide-slag-solidified soil. The enhancement effect was the most significant when a 0.3% content of 19 mm long fibers was incorporated into the carbide-slag-solidified soil.

Experimental Study on the Strength Deterioration and Mechanism of Stabilized River Silt Reinforced with Cement and Alginate Fibers

“…However, crack development was suppressed effectively by the addition of alginate fibers. So, the deformation of AFCS was reduced, and the adverse effects of W-D cycles on the strength of AFCS were also reduced [4,52].…”

“…As a result, the decrease in the UCS of AFCS was mitigated. Further, the tensile effect of the fibers [4] helped maintain the structural integrity of AFCS under the influence of F-T cycles, preventing extensive cracking and even failure. The F-T cycle test revealed that adding alginate fiber significantly improved the quality and strength of the stabilized soil.…”

“…River silt can significantly impact the environment and human activities, such as by affecting water quality, reducing soil fertility and causing problems for navigation, irrigation and construction. Thus, their engineering application is challenging due to the undesirable characteristics of a high moisture content, a lower compression modulus, high rheology, low strength and low permeability [1][2][3][4]. Most river silt is treated with landfill, dumping, sea dumping and incineration, which not only occupy a large quantity of land resources but also cause pollution in groundwater and soil resources.…”

The Influence of Different Curing Environments on the Mechanical Properties and Reinforcement Mechanism of Dredger Fill Stabilized with Cement and Polypropylene Fibers

“…The polypropylene fibers were randomly distributed in the CS, forming a spatial mesh structure, as shown in Figure 11. Since fibers cannot participate in cement hydration reactions, the relative frictional force provided by the rough surface of the fiber enhanced the PFCSs' cohesion [36,37]. Further, the polypropylene fibers limit particle movement and suppress cracks effectively [36,38].…”

Research on the Performance of Calcium Carbide Slag–Fly Ash Stabilized Soil

“…shows that the cleavage strength at the age of 7 and 28 days increases faster than that at the age of 60 and 90 days, indicating a faster increase in the early strength of CCS-FA-stabilized soil. In the later stage of the reaction, volcanic ash reacts slowly to form C-S-H and C-A-H, which can improve the initial activation energy of the reaction [29,30].…”