Effect of compound nano-CaCO3 addition on strength development and microstructure of cement-stabilized soil in the marine environment

Meng, Tao; Qiang, Yejia; Hu, Anfeng; Xu, Chuntai; Liang, Lin

doi:10.1016/j.conbuildmat.2017.06.016

Cited by 76 publications

(23 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…coal mine roof [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Already, many significant results have been obtained.…”

Section: Methodsmentioning

confidence: 99%

“…The physical and mechanical properties of the cemented composites are influenced, not only by the cementing materials, but also by the structure of the cemented composite. At present, research on goaf treatment mainly focuses on the development and selection of filling materials, mechanical properties of filling materials and surrounding rock, and evaluation and control of the stability of the coal mine roof [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Already, many significant results have been obtained.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical Characteristics and Failure Prediction of Cement Mortar with a Sandwich Structure

Liu

Tan

et al. 2019

Minerals

View full text Add to dashboard Cite

It is necessary to master the mechanical properties and failure prediction of the composite of mortar and rock block in a mined-out area. In this study, uniaxial compression and acoustic emission (AE) synchronous tests of mortar specimens with different sandwich materials and cement–sand ratios were carried out. The results showed that the compressive strength and elastic modulus of mortar specimens increased with an increase in the cement–sand ratio and the stiffness of the sandwich material. The AE counts and energy of mortar specimens with a high-stiffness sandwich material were maximum when they were destroyed. The b value, a number that reflects the extent of fracture propagation, decreased first and then increased with the increase in strain. The inflection point of the b value can be taken as the indication of the imminent failure of the mortar. A method for determining the b value at the turning point was proposed and verified.

show abstract

“…coal mine roof [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Already, many significant results have been obtained.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics and Failure Prediction of Cement Mortar with a Sandwich Structure

Liu

Tan

et al. 2019

Minerals

View full text Add to dashboard Cite

show abstract

“…After that, infrastructure construction in permafrost and seasonal permafrost area gradually made people pay increasing attention to permafrost research. Current studies [6][7][8][9] have shown that after FT cycles, the height of soil increased, and the water content decreased. The elastic modulus and failure strength of soil gradually decreased after FT cycles and stabilized after 7 FT cycles.…”

Section: Introductionmentioning

confidence: 99%

The Dependence Between Shear Strength Parameters and Microstructure of Subgrade Soil in Seasonal Permafrost Area

et al. 2020

View full text Add to dashboard Cite

Permafrost and seasonal permafrost are widely distributed in China and all over the world. The failure of soil is mainly shear failure, and the strength of soil mainly refers to the shear strength. The two most important parameters of shear strength are cohesion and angle of internal friction. In order to ensure the sustainability of road construction in seasonal permafrost area, the microstructure of subgrade soil was observed and analyzed. First, three subgrade soils with different plasticity indices were prepared for triaxial test and scanning electron microscope (SEM). Then, these specimens underwent freezing–thawing (FT) cycles and were obtained shear strength parameters by triaxial shear test. Next, the microstructure images of soil were obtained by SEM, and the microstructure parameters of soil were extracted by image processing software. Finally, the correlation method was used to analyze the dependence between the shear strength parameters and the microstructure parameters. Results revealed that subgrade soils with a higher plasticity index had higher cohesion and lower angle of internal friction. In addition, with the increase of the number of FT cycles, the diameter and number of soil particles and pores tend to increase, while the roundness, fractal dimension and directional probabilistic entropy of particles decreased. With the increase of the plasticity index, the particle and pore diameter decreased, but the particle and pore number increased. Besides, particle roundness had the greatest influence on the cohesion and angle of internal friction of shear strength parameters.

show abstract

“…Over-rich cement layers are instead too stiff and prone to shrinkage cracking, causing accelerated pavement failure [5,6]. Nano-CaCO3 addition can improve the compressive strength of cement-stabilized soil and reduce the corrosion speed and increase the compaction degree of cement-stabilized soil in marine environment [7].…”

Section: Introduction mentioning

confidence: 99%

Magnesium Salt Influenced Strength Behavior of Lime-Fly Ash Stabilized Fine Grained Soil

Jia

Fu²,

Wang³

2020

View full text Add to dashboard Cite

The fine grained soil subgrade in coastal areas has the characteristics of high underground water level and serious salinization, and the lime-fly ash stabilized soil (LFSS) often used as the road base material. In order to study the effect of magnesium salt on the material strength, 5 % MgCl2 solution was used to simulate the groundwater magnesium salt environment, and specimens with 7 d, 14 d, 28 d, 60 d and 90 d curing ages were tested in MgCl2 solution for 1 d, 5 d, 10 d, 15 d or 30 d. A controlled test was also conducted in purified water. Strength mechanism of LFSS was analyzed; SEM test was taken; and the influence mechanism of MgCl2 medium was analyzed. The results showed that MgCl2 medium, immersing time, and curing age have effects on compressive strength of LFSS. More specifically, although the early strength is low, the strength of LFSS maintains slow and steady growth from 7 d to 90 d. Long-term immersing in both MgCl2 solution and purified water will reduce the strength of LFSS, while the strength of specimen immersed in MgCl2 solution will decrease faster. Reactions between MgCl2 and LFSS destroyed the original gels and crystals, causing a negative impact on the strength of LFSS. However, with the test dose of MgCl2, the reduced strength of LFSS can still satisfy the sub-base requirement of second-class highway in China.

show abstract

Effect of compound nano-CaCO3 addition on strength development and microstructure of cement-stabilized soil in the marine environment

Cited by 76 publications

References 24 publications

Mechanical Characteristics and Failure Prediction of Cement Mortar with a Sandwich Structure

Mechanical Characteristics and Failure Prediction of Cement Mortar with a Sandwich Structure

The Dependence Between Shear Strength Parameters and Microstructure of Subgrade Soil in Seasonal Permafrost Area

Magnesium Salt Influenced Strength Behavior of Lime-Fly Ash Stabilized Fine Grained Soil

Contact Info

Product

Resources

About