Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil

Liu, Hailong; Zhao, Jiuye; Wang, Yu; Nan-gai, YI; Cui, Chunyi

doi:10.3390/su13042295

Cited by 12 publications

(9 citation statements)

References 43 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ding et al (2019) studied the dynamic characteristics of frozen–thawed soil under cyclic loading using the dynamic triaxial test. Liu et al (2021) measured the unconfined compressive strength of submarine soft soil and analyzed the microstructure of the soil stabilized using the SEM technique. Using SEM, Watabe and Saitoh (2015) found that the high porosity of natural clay soils was not only due to the high initial water content but also the sedimentation of flocculation, which played an important role in the formation of the microfabric of natural clay soils.…”

Section: Introductionmentioning

confidence: 99%

Physical and mechanical properties and microstructures of submarine soils in the Yellow Sea

Tian,

Chang,

Chen

et al. 2023

Deep Underground Science and Engineering

View full text Add to dashboard Cite

In recent years, the exploration of seabed has been intensified, but the submarine soils of silt and sand in the Yellow Sea area have not been well investigated so far. In this study, the physical and mechanical properties of silt and sand from the Yellow Sea were measured using a direct shear apparatus and their microstructures were observed using a scanning electron microscope. The test results suggest that the shear strength of silt and sand increases linearly with the increase of normal stress. Based on the direct shear test, the scanning electron microscope was used to observe the section surface of sand. It is observed that the section surface becomes rough, with many “V”‐shaped cracks. Many particles appear on the surface of the silt structure and tend to be disintegrated. The X‐ray diffraction experiment reveals that the sand and silt have different compositions. The shear strength of sand is slightly greater than that of silt under high stress, which is related to the shape of soil particles and the mineral composition. These results can be a reference for further study of other soils in the Yellow Sea; meanwhile, they can serve as soil parameters for the stability and durability analyses of offshore infrastructure construction.

show abstract

Section: Introductionmentioning

confidence: 99%

Physical and mechanical properties and microstructures of submarine soils in the Yellow Sea

Tian,

Chang,

Chen

et al. 2023

Deep Underground Science and Engineering

View full text Add to dashboard Cite

show abstract

“…After comprehensive investigation, solidification technology is currently the most widely used, economical, and cost-effective method in the utilization of waste soil. Chemical treatment with traditional stabilizers such as lime and cement can effectively alter several basic engineering properties of soils [5]. However, cement stabilization in soils may increase the stiffness and may lead to brittle soil behavior.…”

Section: Introductionmentioning

confidence: 99%

Effect of Polymeric Agent on the Strength and Water Stability of Cement-Stabilized Construction Waste Soil

Li,

Gao,

Zhang

et al. 2023

Sustainability

View full text Add to dashboard Cite

Due to the large output of construction waste soils, it has become an enormous challenge for human society and the ecological environment. The purpose of this paper is to discuss the possibility of using a stabilized waste soil in road engineering. Cement and polymer stabilizers were added to the waste soil, and the effect of the stabilizer on the strength and water stability of the stabilized soil was studied. The structure and morphology of the specimens were analyzed using an X-ray diffractometer (XRD) and a scanning electron microscope (SEM). The results show that the unconfined compressive strength increases by 25.0% and the 28-day water stability coefficient, K increases by 59.6% after the addition of the stabilizer. The XRD curve shows that the addition of the new stabilizer does not produce a new characteristic peak, but the diffraction peak strength of some minerals can be improved. SEM shows that the surface of stabilized soil particles is covered by materials, and the particles show obvious agglomeration, forming a network structure, which improves the strength and water stability of the soil.

show abstract

“…Ye’elimite, also known as tetracalcium trialuminate sulfate, is the dominant mineral in calcium sulfoaluminate (CSA) cement and exhibits high tailored dimensional expansion and early strength [ 1 , 2 , 3 ]. Since the 1970s, CSA cement has been widely used as a rapid repairing material and has recently been promoted for use in numerous domains, including soft soil stabilization and three-dimensional printing [ 4 , 5 , 6 ]. Moreover, CSA cement has been considered a promising alternative binder owing to its lower CO 2 emissions and energy consumption compared with Portland cement, in which ye’elimite plays an essential role [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus Substitution Preference in Ye’elimite: Experiments and Density Functional Theory Simulations

Zhao

Huang

et al. 2021

Materials

Self Cite

View full text Add to dashboard Cite

Density functional theory (DFT) simulation has been recently introduced to understand the doping behavior of impurities in clinker phases. P-doped ye’elimite, a typical doping clinker phase, tends to form when phosphogypsum is used to manufacture calcium sulfoaluminate cement (CSA) clinkers. However, the substitution mechanism of P has not been uncovered yet. In this study, the influence of different doping amounts of P on the crystalline and electronic structure of ye’elimite was investigated using backscattered scanning electron microscopy–energy X-ray dispersive spectroscopy, X-ray diffraction tests, Rietveld quantitative phase analysis, and DFT simulations. Furthermore, the substitution preference of P in ye’elimite was revealed. Our results showed that increasing the doping amount of P increased the impurity contents in CSA clinkers, transforming the ye’elimite crystal system from the orthorhombic to the cubic system and decreasing the interplanar spacing of ye’elimite. Based on the calculation results of the defect formation energies, additional energies were required for P atoms to substitute Ca/Al atoms compared with those required for P atoms to substitute S atoms in both orthorhombic and cubic systems of ye’elimite. Combined calculation results of the bond length–bond order and partial density of states showed that the doped P atoms preferably substituted S atoms; the second possible substituted atoms were Al atoms, while there was only a slight possibility for substitution of Ca atoms. The substitution of P atoms for S atoms can be verified based on the elemental distribution in P-doped ye’elimite and the increasing residual CaSO4 contents. The transition of the crystal system and a decrease in the interplanar spacing for ye’elimite can also prove that the substitution of P atoms for Al atoms occurred substantially.

show abstract

Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil

Cited by 12 publications

References 43 publications

Physical and mechanical properties and microstructures of submarine soils in the Yellow Sea

Physical and mechanical properties and microstructures of submarine soils in the Yellow Sea

Effect of Polymeric Agent on the Strength and Water Stability of Cement-Stabilized Construction Waste Soil

Phosphorus Substitution Preference in Ye’elimite: Experiments and Density Functional Theory Simulations

Contact Info

Product

Resources

About