Experimental feasibility study of ethylene-vinyl acetate copolymer (EVA) as cement stabilized soil curing agent

Zhang, Bowen; Jian, Wei; Xu, Qingzheng; Yuan, Dongdong; Shan, Jinhuan; Lu, Rong

doi:10.1080/14680629.2020.1834442

Cited by 17 publications

(7 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The CO groups in VAE complex with Ca 2+ through coordination bonds, forming a polymer film with adhesive strength. This enhances chemical adsorption between the hydration products and the polymer. ,− …”

Section: Resultsmentioning

confidence: 99%

A Hierarchical Strengthening Path for Chemical Foaming: The Transformation toward Sustainable High-Performance Foamed Material Derived from Solid Waste

Yang,

Wang,

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The pores of conventional foam composites easily crack and collapse under internal stress. Fabricating foamed materials (FMs) with high specific strength and excellent pore structure at ambient conditions remains a significant challenge. This study achieved hierarchical reinforcement of waste-based FMs' matrix and pores through systematic control of the "foaming−setting−curing" process. The results demonstrate that adjusting the plastic viscosity and setting time of fresh pastes can improve the pore size distribution and optimize pore microstructures. Concerning modification at the gas−liquid interface, organic additives and hydration products could mutually adsorb and bond at the pore interfaces, thickening pore walls and completing embedded structures. Moreover, the effective variable-pressure foaming process not only stabilizes chemical foaming but also enhances specific strength by accelerating hydration and improving pore wall integrity. Concerning aeration methods, the introduction of copper tailings catalyzed the decomposition of H 2 O 2 at room temperature. Additionally, the coupled effects of multidimensional stable foaming techniques suitable for H 2 O 2 foaming and the underlying mechanism are elucidated. Overall, this research offers a systematic, low-energy strategy for enhancing performance and reinforcing pores in waste-based FMs.

show abstract

Section: Resultsmentioning

confidence: 99%

A Hierarchical Strengthening Path for Chemical Foaming: The Transformation toward Sustainable High-Performance Foamed Material Derived from Solid Waste

Yang,

Wang,

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…SCA-2 soil curing agent is mainly composed of sodium silicate and polyacrylamide, can chemically react with cement to produce gel, which can wrap soil particles, reduce pores in soil, and thus increase the cohesion and compressive strength of modified loess [ 43 ]. However, when the content of curing agent exceeds 4%, the soil produces a saturation reaction to it ( Figure 6 , Figure 7 and Figure 8 ), and the excess liquid curing agent fills the pores of the soil and acts as a lubricant, which reduces the strength index of the soil ( Figure 13 a,d), and this can further explain the phenomenon shown in Figure 6 , Figure 7 and Figure 8 that the internal friction angle, cohesion and compressive strength of the modified loess increased firstly with the curing agent content and then decreased from the maximum strength at the content of 4%.…”

Section: Discussionmentioning

confidence: 99%

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

et al. 2022

View full text Add to dashboard Cite

Construction of high-speed railway subgrade on loess soils in the Loess Plateau is risky because such soil is susceptible to differential settlements. Various soil-improvement methods have been used to enhance the mechanical properties of loess. Lime-ash soil and cement-lime soil are the most commonly used methods in the improvement of loess subgrade, while few studies have been found on loess subgrade improvement by using composite material consisting of traditional materials and new materials. A series of direct shear tests and unconfined compressive tests were conducted on the loess specimen with the addition of three kinds of composite materials: traditional material cement, new material polypropylene fiber and SCA-2 soil curing agent. The numerical simulation was conducted on loess subgrade in an actual engineering practice. The experimental results show that cement, polypropylene fiber and SCA-2 soil curing agent can effectively improve the shear strength and compressive strength of loess, and the influence degree is cement > fiber > curing agent. Additionally, based on the relative strength characteristics of the improved loess, an optimal improvement scheme for the composite-material-modified loess was obtained: 16% cement content + 0.5% fiber content + 4% curing agent content. The numerical simulation results revealed that the compressive strength index of the improved loess has a significant impact on the subgrade settlement, and the optimal improvement scheme obtained from comprehensive analysis can effectively improve the settlement of high-speed railway subgrade under vibration load.

show abstract

“…According to research into the market of building additives [2, 3], the use of vinyl copolymer esters and calcium formate is widespread in such products. In studies under [4,5], comparisons involved various redispersed vinyl copolymer powders. In most contemporary papers [6][7][8][9][10][11][12][13][14], the authors identified three main additives: vinyl acetate/versatate copolymers (VA/VeoVa) and vinyl acrylic (VA Acrylic), as well as calcium formate powder (FormCa).…”

Section: Examined Materials and Equipment Used In Experimentsmentioning

confidence: 99%

Identifying the influence of redispersed polymers on cement matrix properties

Kovalenko

Токарчук

Kovalenko

et al. 2022

EEJET

View full text Add to dashboard Cite

The physical-mechanical influence and chemical effect of calcium formate, vinyl acetate/versatate, and vinyl-acrylate copolymer on the processes of solidification, hardening, and structure formation of the cement matrix were studied during the research reported here. The compositions of mixtures containing additives in the amount of 1, 3, and 5 wt % were investigated. Noteworthy is the water-holding nature of vinyl acetate/versatate and vinyl-acrylate copolymer. With the introduction of appropriate additives, an increase in working time of the mixtures is noted, which was manifested in prolonging the end time of solidification duration. Calcium formate reduced the end time of solidification duration with an increase in the content of the additive. During 28 days of hardening, a decrease in strength gain was observed with an increase in the content of the additive compared to control samples. At 1 wt % of the additive, the decline in strength on day 28 was 8.7 % for calcium formate, 13 % for versatate, and 15.5 % for vinyl-acrylate copolymer. For versatate and vinyl acrylate with the addition of 3 and 5 wt % in the mixture, the loss of strength is 23–25 % and 27–56.7 %, respectively. 5 wt % calcium formate admixture, compared to 3 wt %, on day 7 and day 28 of hardening has a higher strength index. This nature of the effect of additives is explained by the formation of polymer structures throughout the volume of the mixture with the introduction of versatate and copolymer vinyl acrylate, as well as their chemical interaction with the components of the cement binder during hydration in the formed alkaline medium. Calcium formate plays the role of both a filler and a hardening accelerator due to the introduction of an additional amount of calcium ions. The reported results can be used as a basis for continuing to study the effect of redispersed additives on the durability of cement articles, the development of new formulations for building mixtures, and their potential use in the production of concrete.

show abstract

Experimental feasibility study of ethylene-vinyl acetate copolymer (EVA) as cement stabilized soil curing agent

Cited by 17 publications

References 53 publications

A Hierarchical Strengthening Path for Chemical Foaming: The Transformation toward Sustainable High-Performance Foamed Material Derived from Solid Waste

A Hierarchical Strengthening Path for Chemical Foaming: The Transformation toward Sustainable High-Performance Foamed Material Derived from Solid Waste

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

Identifying the influence of redispersed polymers on cement matrix properties

Contact Info

Product

Resources

About