Experimental Study on Mechanical Properties of Cement-Solidified Remolded Soil Reinforces by Polyvinyl Alcohol Fiber

Abstract

As a reusable resource, remolded soils are often not utilized on a large scale due to their high water content and low bearing capacity. By using polyvinyl alcohol fiber (PVA) as reinforcing material and cement as cementing material, the remolded soil was improved into a usable consolidated remolded soil, and the effects of different fiber content, fiber length modulus, and conservation age on the static and dynamic characteristics of the consolidated remolded soil were investigated by conducting triaxial consolidated undrained shear tests and dynamic triaxial tests on the consolidated remolded soil. The results show that the use of PVA fiber reinforced cement can effectively improve the shear strength and dynamic strength of the remolded soil and reduce the water content of the remolded soil; the best effect on the static strength of the remolded soil was achieved when 0.1% of PVA fibers with a length of 6 mm were incorporated into the specimens at a conservation age of 28 d; the best effect on the dynamic strength of the remolded soil was achieved when 0.3% of PVA fibers with a length of 12 mm were incorporated into the specimens at a conservation age of 7 d.

Effect of fiber content on mechanical parameters and crack development of two kinds of reinforced cement soil

“…The fracture elongation of qualified PVA fiber can reach 6.9%, thus avoiding the destruction of cementitious materials in the process of damage only through a crack, but first formed numerous micro-cracks, and finally the overall damage occurred (Li and Leung 1992), Li et al (2022b) found that PVA fiber can be combined with hydration products to improve the crack resistance of cement soil materials and enhance the durability of materials, Mercuri et al (2023) added PVA fibers with different contents and lengths to mortar, and obtained the change rule of compressive strength of mortar material with fiber, and fitted the formula by linear regression, Yang et al (2023b) added PVA fibers and expanders to cement grout and found that it improved the mechanical properties and prevented brittle damage, but reduced the thermal aging bond strength of the grout, Yao et al (2021) found that the addition of PVA fibers can improve the compressive strength, flexural strength and tensile strength of the cement soil, and can effectively reduce the width of cracks, however, when the content of fiber is more than 1%, fiber aggregation will occur inside the specimen, which will affect the improvement of strength. Mei et al (2022) found through experiments that adding 0.1% 6 mm PVA fibers to cement soil can improve the static strength best, and adding 0.3% 12 mm PVA fibers can improve the dynamic strength best. Basalt fibers, as an environmentally friendly fiber with good mechanical properties, are also often used to improve the properties of cementitious materials (Zheng et al 2021, Aishwarya and Priya Rachel 2023, Navaratnam et al 2023, Owino and Hossain (2023) found that the longer the length of the basalt fibers the more significant the increase in the bias stress in the cement soil material, Zhou et al (2020) found that when the basalt fiber content is 0.3% and 0.4%, the improvement of concrete toughness is the best.…”

Fiber Solidification Treatment of River and Lake Wastewater and Sediments: Deformation Characteristics and Microscopic Mechanism Research

“…Within the soil, fibers intertwine and aggregate, creating a mesh-like spatial structure that markedly enhances diverse mechanical indicators [19]. Present research on fiber reinforcement technology primarily focuses on factors including fiber type [20][21][22], fiber content [23][24][25][26], and fiber length [27][28][29][30], enhancing the analysis of how the addition of fibers influences soil. Presently, the raw materials for fiber reinforcement predominantly consist of sandy soil [31][32][33][34] and loess [35][36][37][38].…”

Thermal Conductivity and Shear Strength in Root-Reinforced Silty Clay: An Analysis of Asteraceae Plants from Taihang Mountain

“…Despite an abundance of studies on the thermal dynamics of silty clay, a discernible focus is evident: investigations predominantly target singular soil types, often overlooking the interplay of biology, particularly plant root systems [15][16][17][18][19]. Moreover, extant literature is replete with experiments, often sidelining methodical theoretical analyses [20][21][22][23][24][25][26][27]. For instance, a preponderance of studies have been noted to quantify thermal conductivity through mere experimental measurements, abstaining from dissecting influences like pore configurations, seepage conditions, or stress states.…”