Mechanical Properties and Mechanisms of Concentration-Controlled Alkali-activated Fly Ash Stabilized Saline soil in Seasonally Frozen regions DOI

Sining Li,

Yong Huang, Jian Sun

et al.

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 5, 2024

Abstract Sulfate saline soil in the seasonally frozen zone generate freeze-thaw cycles, as well expansion and thawing, which causes road engineering issues, thus they should be strengthened. This work investigates effect of alkali content on activation fly ash (FA) stabilized sulfate by conducting unconfined compressive strength (UCS), splitting strength, cycles (FTs) tests. The results demonstrate that NaOH concentration increases, UCS tend to increase first, then decrease. N3 (stabilized with 0.5 M stimulated FA) had best performance, 7.18 MPa 1.89 MPa, respectively. residual values after 5 FTs were 46.35% 39.92%, activated FA hydration products consisted primarily C-S-H, C-A-H gel ettringite, gels linking particles filled cracks between them. As a result, mechanical characteristics frost resistance much enhanced. study can provide reference for solidification treatment foundations regions.

Language: Английский

Characterization and mechanism study of sulfate saline soil solidification in seasonal frozen regions using ternary solid waste-cement synergy DOI
Hongbo Li,

Xinrui Kang,

Sheng Li

et al.

Construction and Building Materials, Journal Year: 2024, Volume and Issue: 427, P. 136263 - 136263

Published: April 16, 2024

Language: Английский

Citations

13
The crack characteristics and microscopic mechanism of composite solidified soil under alternating wet-dry and freeze-thaw cycles DOI
Hang Shu, Qingbo Yu, Cencen Niu

et al.

Cold Regions Science and Technology, Journal Year: 2025, Volume and Issue: unknown, P. 104479 - 104479

Published: March 1, 2025

Language: Английский

Citations

1
Mechanisms of concentration control alkali activated fly ash stabilized saline soil in seasonally frozen regions DOI Creative Commons

Sining Li,

Yong Huang, Jian Sun

et al.

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 2, 2025

In the framework of sustainable development and environmental preservation, this research aims to improve stability frost resistance sulfate saline soil by utilizing industrial solid waste. Geopolymer materials containing fly ash (FA) activated different NaOH concentrations were studied for study on stabilized with soil, used ranged from 0.1 0.9. This investigates impact molar concentration number freeze-thaw cycles microstructure strength incorporating FA geopolymer. The XRD, FTIR, TG studies NaOH-excited revealed that gel material grew increasing concentration. increased then declined as increased, an optimum excitation 0.5 M. After 28 days curing at 20 °C, its UCS splitting 7.18 MPa 1.89 MPa, respectively. residual values after 5 (12 hours freezing followed 12 thawing +20 °C) optimal 46.35% 39.92%,

Language: Английский

Citations

0
Optimization of particle size distribution of sulfur-free lignin in enhancing disintegration resistance of saline soil DOI Creative Commons

Weitong Xia,

Qing Wang, Qingbo Yu

et al.

Journal of Rock Mechanics and Geotechnical Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Language: Английский

Citations

0
Optimization of Synergy Among Granulated Blast Furnace Slag, Magnesium Oxide, and Basalt Fiber for the Solidification of Soft Clay DOI Open Access
Ho‐Il Ji, Xiang Fan,

Fan Ding

et al.

Materials, Journal Year: 2025, Volume and Issue: 18(7), P. 1577 - 1577

Published: March 31, 2025

In order to reuse granulated blast furnace slag (GBFS) and low-strength soft clay (SC), this study developed a curing material using magnesium oxide (MgO) as an alkali activator excite the GBFS basalt fiber (BF) reinforcing prepare SC. The mixing ranges of GBFS, MgO, BF were established 9.48%~14.52%, 0.48%~5.52%, 0%~1.00454% dry mass, respectively, ratios three optimized central composite design (CCD) test. Through analysis variance, factor interaction analysis, parameter optimization CCD test, optimal mass ratio was determined be 13.35:4.47:0.26. named GMBF mixed with SC solidified clay. An equal amount ordinary Portland cement (OPC) taken formed form OPC mechanical properties, durability, hydration products clarified by unconfined compressive strength (UCS) freeze–thaw cycle X-ray diffraction (XRD) scanning electron microscopy (SEM) UCS 1.08 MPa 2.85 at 7 91 days, which 45.9% 33.8% higher than that (0.74 2.13 MPa) same time. After ten cycles, decreased from initial 1.59 0.7 MPa, decreases 44.2% 67.1%, respectively. By XRD SEM, mainly calcium silicate hydrate gel hydrotalcite. interface bonding bridging effect between or products, indicating these interactions contributed enhanced structural integrity. This demonstrates approach provides solution for recycling GBFS. Laboratory tests confirm potential formulation practical engineering applications.

Language: Английский

Citations

0
Stabilization of recycled and pure soils using mussel shell powder and cement: Experimental evaluation of strength and durability DOI
Tuğba Eskişar, Esma Rahat

Engineering Science and Technology an International Journal, Journal Year: 2025, Volume and Issue: 67, P. 102073 - 102073

Published: May 1, 2025

Language: Английский

Citations

0
Mitigating frost heave of a soil stabilized with sisal fiber exposed to freeze-thaw cycles DOI
Fei Deng, Jianguo Lu, Xusheng Wan

et al.

Geotextiles and Geomembranes, Journal Year: 2024, Volume and Issue: 53(1), P. 394 - 404

Published: Nov. 20, 2024

Language: Английский

Citations

3
Experimental study on the performance of basalt fiber combined with cement-based material solidified shield waste mud under the coupled effects of acid corrosion and dry-wet cycles DOI

Henggen Zhang,

Tao Liu, Yuxue Cui

et al.

Construction and Building Materials, Journal Year: 2025, Volume and Issue: 463, P. 140110 - 140110

Published: Jan. 24, 2025

Language: Английский

Citations

0
Experimental Study on the Properties of Basalt Fiber–Cement-Stabilized Expansive Soil DOI Open Access
Junhua Chen,

Jinlan Mu,

Aijun Chen

et al.

Sustainability, Journal Year: 2024, Volume and Issue: 16(17), P. 7579 - 7579

Published: Sept. 1, 2024

Expansive soil is prone to rapid strength degradation caused by repeated volume swelling and shrinkage under alternating dry–wet conditions. Basalt fiber (BF) cement are utilized stabilize expansive soil, aiming curb its shrinkage, enhance strength, ensure durability in cycles. This study examines the impact of varying content (0–1%) BF on physical mechanical characteristics stabilized with a 6% content. We investigated these effects through series experiments including compaction, unconfined compressive (UCS), undrained consolidation shear, cycles, scanning electron microscope (SEM) analyses. The yielded following conclusions: Combining leverages cement’s chemical curing ability BF’s reinforcing effect. Incorporating 0.4% BFs significantly improves cement-stabilized soils, reducing expansion 36.17% contraction 28.4%. Furthermore, it enhances both initial soils Without addition increased UCS 24.8% shear 24.6% 40%. After 16 improved 38.87% compared alone. Both number cycles influenced soils. Multivariate nonlinear equations were used model UCS, offering predictive framework for assessing contents hydrate adheres surface, increasing adhesion friction between fibers particles. Additionally, form network structure within soil. These factors collectively deformation resistance, findings offer valuable insights into combining traditional cementitious materials basalt manage hazards, reduce resource consumption, mitigate environmental impacts, thereby contributing sustainable development.

Language: Английский

Citations

2
Mechanical response of Q2 loess stratum surrounding a hydraulic tunnel under dry-wet cycles DOI Creative Commons

Sen Peng,

Caihui Zhu,

Letian Zhai

et al.

Journal of Rock Mechanics and Geotechnical Engineering, Journal Year: 2024, Volume and Issue: 16(12), P. 4955 - 4970

Published: Aug. 2, 2024

Understanding the mechanical response of Q2 loess subjected to dry-wet cycles (DWCs) is premise for rational design a hydraulic tunnel. Taking Hanjiang-to-Weihe south line project in China as research background, microstructure evolution, strength degradation and compression characteristics under different DWCs were investigated, fluid-solid coupling analysis tunnel was carried out using FLAC3D software. The amplification effect surrounding soil pressure (SSP) its influence on long-term stability obtained. results showed that pore parameters undisturbed remolded basically tend be stable after number exceeds 3. porosity increased by 26%. internal friction angle cohesion are decreased 35% 31%, respectively. vertical strain 55% considering DWCs. After stabilized, SSP ratio between 10% 25%. With increase buried depth tunnel, 8%-10%. reduced from 8% 16% rise groundwater level. As increases burial decreases, distribution becomes progressively more non-uniform. Based factor modified compressive arch theory, model proposed, which can preliminarily applied supporting structures

Language: Английский

Citations

1