Effect of cement additives on unconfined compressive strength of warm and ice-rich frozen soil

Chai, Mingtang; Zhang, Hu; Zhang, Jianming; Zhang, Zhilong

doi:10.1016/j.conbuildmat.2017.05.202

Cited by 50 publications

(15 citation statements)

References 27 publications

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“…Yu et al 21 improved the frozen soil with nano-silica, cement and polypropylene fiber and the mixed stabilizer that greatly reduced thaw settlement and increased shear strength. Chai et al 22 , 23 used cement and additives, sodium hydroxide, sodium silicate, sodium lignosulfonate and super-absorbent polymer, etc. to improve frozen soil and the results showed that 15.0% cement and 1.3% Toogood together can lead to a 2.0% thaw compression deformation at 0.1 MPa while the other stabilizers did not achieve the expected effects.…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of frozen soil improved with sulphoaluminate cement and its microscopic mechanism

Yin

Zhang

et al. 2020

Sci Rep

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The foundation of constructions built in the permafrost areas undergo considerable creeping or thawing deformation because of the underlying ice-rich permafrost. Soil improvement may be of advantage in treating ice-rich permafrost at shallow depth. Sulphoaluminate cement was a potential material to improve frozen soil. Simultaneously, two other cements, ordinary Portland cement and Magnesium phosphate cement were selected as the comparison. The mechanical behavior of modified frozen soil was studied with thaw compression tests and unconfined compression strength tests. Meanwhile, the microscopic mechanism was explored by field emission scanning electron microscopy, particle size analysis and X-ray diffractometry. The results showed Sulphoaluminate cement was useful in reducing the thaw compression deformation and in enhancing the strength of the frozen soil. The improvement of the mechanical behavior depended mainly on two aspects: the formation of structural mineral crystals and the agglomeration of soil particles. The two main factors contributed to the improvement of mechanical properties simultaneously. The thicker AFt crystals result in a higher strength and AFt plays an important role in improving the mechanical properties of frozen soils.The study verified that Sulphoaluminate cement was an excellent stabilizer to improve ice-rich frozen soils.

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Section: Introductionmentioning

confidence: 99%

Mechanical behavior of frozen soil improved with sulphoaluminate cement and its microscopic mechanism

Yin

Zhang

et al. 2020

Sci Rep

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“…The chemical stabilization of expansive soils is a substantiated quick-fix method in the short term. However, concerning the long-term sustainability of these methods, there are considerable problems, concerning the mineralogy of the soil clay and the environmental fluctuations of clay soil, such as water availability and construction methods [26,27]. Chemical stabilization methods make expansive clay soils stable under compression, but contribute minimally to the tension.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influence of Polypropylene Fiber on the Swelling Pressure Expansion Attributes of Silica Fume Stabilized Clayey Soil

Tiwari

Satyam

2019

Geosciences

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Expansive soil shows dual swell-shrink which is not suitable for construction. Several mitigating techniques exist to counteract the problem promulgated by expansive clayey soils. This paper explored the potential mecho-chemical reinforcement of expansive clayey soil to mitigate the effect of upward swelling pressure and heave. The polypropylene fiber is randomly distributed in the soil for mechanical stabilization, and the industrial residual silica fume is used as a chemical stabilizer. The experimental analysis was made in three phases which involved tests on mechanically-reinforced expansive soil, using randomly distributed polypropylene fibers with different percentages (0.25%, 0.50%, and 1.00%), and which were 12 mm length. The second phase of experiments was carried out on chemical stabilized expansive soil with different percentages (2%, 4%, and 8%) of silica, and the next phase of the experiment focused on the combination of mecho-chemical stabilization of the expansive soil with different combinations of silica (i.e., 2%, 4%, and 8%) and polypropylene fibers (i.e., 0.25%, 0.50%, and 1.00%). Maximum dry density (MDD), optimum moisture content (OMC), liquid limit (LL), plastic limit (PL), plastic index (PI), grain size, and constant volume swelling pressure tests were performed on unreinforced and reinforced expansive soil, to investigate the effects of polypropylene fiber and silica fume on the engineering properties of expansive clayey soil. The experimental results illustrate that the inclusion of polypropylene fiber has a significant effect on the upward swelling pressure and expansion property of expansive soil. The reduction in the upward swelling pressure and expansion is a function of fiber content. These results also indicated that the use of silica fume caused a reduction in upward swelling potential, and its effect was considerably more than the influence of fiber.

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“…There are two types of soil stabilizers: inorganic stabilizers and organic polymer stabilizers. Inorganic stabilizers, including cement [7][8][9][10], fly ash [11][12][13], lime [14,15], and fibers [16][17][18][19], are mainly used in roadbeds, foundations, piles, and embankments. They greatly improve the strength and stiffness of the soil, but their durability and environmental effects remain unknown and need to be studied.…”

Section: Introductionmentioning

confidence: 99%

Unconfined Compressive Strength of Aqueous Polymer-Modified Saline Soil

Zhu

Gao

et al. 2019

International Journal of Polymer Science

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Saline soil is a special soil that consists of fine particles and has poor engineering properties. It causes salt heaving and is collapsible and corrosive. The treatment of this type of soil for the use as a resource for roadbed fillings has been one of the most important engineering topics in highway construction near coastal areas. This study introduces a new type of aqueous polymer, called ZM, which is used to amend and stabilize saline soil. To test the effects of ZM-solidified saline soil, unconfined compressive strength (UCS) tests were carried out on unmodified and ZM-modified saline soil specimens, respectively. The test results show that the ZM additive significantly improves the UCS. Based on the increase of the ZM admixture, the UCS increases with the curing time. The main increment of the UCS occurs within the first seven days of curing. In addition, the salt content has a great influence on the UCS. With increasing ZM concentration and curing time, the water stability and wetting-drying cycling resistance improve. Based on the X-ray diffraction results, the diffraction peaks of ZM-modified saline soil insignificantly change compared with those of unmodified saline soil. However, the SEM images indicate the formation of membrane structures in ZM-modified saline soil. The modification process produces denser and more stable soil because the reaction products fill voids inside the soil and form a viscous membrane structure on the soil surface.

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Effect of cement additives on unconfined compressive strength of warm and ice-rich frozen soil

Cited by 50 publications

References 27 publications

Mechanical behavior of frozen soil improved with sulphoaluminate cement and its microscopic mechanism

Mechanical behavior of frozen soil improved with sulphoaluminate cement and its microscopic mechanism

Experimental Study on the Influence of Polypropylene Fiber on the Swelling Pressure Expansion Attributes of Silica Fume Stabilized Clayey Soil

Unconfined Compressive Strength of Aqueous Polymer-Modified Saline Soil

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