Effects of lithium carbonate on performances of sulphoaluminate cement-based dual liquid high water material and its mechanisms

Zhang, Yaohui; Wang, Yuli; Li, Tianbin; Xiong, Zuqiang; Sun, Yapeng

doi:10.1016/j.conbuildmat.2017.11.130

Cited by 78 publications

(32 citation statements)

References 21 publications

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“…Sodium carbonate promotes the formation of gyrolite which is responsible for the acceleration of setting times as reported by Reddy et al [35] and the improvement of compressive strength at early ages [36]. On the other hand, lithium carbonate addition is responsible for the precipitation of lithium aluminate hydrate LiAl 2 (OH) 7 •2H 2 O which serves as nucleation site for aluminum hydroxide precipitation that accelerates the whole hydration process and promotes the production of ettringite, the main hydration product of CSA cements [29,30,37].…”

Section: Elasto-mechanical Propertiesmentioning

confidence: 89%

Influence of Lithium Carbonate and Sodium Carbonate on Physical and Elastic Properties and on Carbonation Resistance of Calcium Sulphoaluminate-Based Mortars

et al. 2019

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In this study, three different hardening accelerating admixtures (sodium carbonate, lithium carbonate and a blend of sodium and lithium carbonates) were employed to prepare calcium sulphoaluminate cement-based mortars. The workability, setting times, entrapped air, elasto-mechanical properties such as compressive strength and dynamic modulus of elasticity, free shrinkage, water absorption and carbonation rate were measured and mercury intrusion porosimetry were also performed. Experimental results show that a mixture of lithium carbonate and sodium carbonate acts as a hardening accelerating admixture, improving the early-age strength and promoting a remarkable pore structure refinement. Finally, sodium carbonate also reduces the water absorption, the carbonation rate and the shrinkage of mortars without affecting the setting times and the workability.

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Section: Elasto-mechanical Propertiesmentioning

confidence: 89%

Influence of Lithium Carbonate and Sodium Carbonate on Physical and Elastic Properties and on Carbonation Resistance of Calcium Sulphoaluminate-Based Mortars

et al. 2019

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“…The content and structure of ettringite and C-S-H is the main factor influencing the mechanic properties of the HWBM according to the previous reports 1,7,8 . These results indicate that there are different variation change on content of ettringite and C-S-H in the anodic region and cathodic region of samples after electrochemical treatment.…”

Section: Mineralogical Composition Change Of the Hwbmsmentioning

confidence: 89%

“…To improve the performances of HWBMs and reduce the backfill cost, numerous studies have been performed, and the effects of using various additives (such as fly ash, gravel, river sludge, lithium carbonate, and aluminum sulfate) on the physical and chemical properties of HWBMs has been investigated [4][5][6][7][8] . The research shows that the uniaxial compression strength (UCS) and elastic modulus of the HWBM decreased after adding the fly ash, while the cost was reduced and the residual strength increased 4,5 .…”

mentioning

confidence: 99%

“…The research shows that the uniaxial compression strength (UCS) and elastic modulus of the HWBM decreased after adding the fly ash, while the cost was reduced and the residual strength increased 4,5 . Additionally, the addition of lithium carbonate and aluminum sulfate can promote the hydration process of the HWBM 7,8 . However, electrochemical treatment techniques are also a new modified method applied to rock and soil mass, and can effectively improve the physicochemical properties of rock and soil mass.…”

mentioning

confidence: 99%

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Experimental and mechanistic research on modifying the mechanic properties of the high water backfill material by electrochemical treatment

Xie

Sun

Wang

et al. 2020

Sci Rep

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To promote the engineering applications of high water backfill materials (HWBM) in mining, a series of experiments are performed to investigate the effects of the direct current (DC) electric field on the mechanic properties and electrical resistivity of HWBMs. Based on X-ray diffraction (XRD) and scanning electron microscopy (SEM) investigations, the influence of electrochemical treatment on the hydration products and the microstructure of the HWBM was studied. The results show that the peak strength, elastic modulus, deformation modulus and electrical resistivity of the HWBM samples all first increased and then decreased with the increasing of the potential gradient, and the peak points appeared when the potential gradient was 0.2 V/cm. The anisotropy of content of ettringite and calcium silicate hydrates (C–S–H) increased betweent the anodic and cathodic regions of samples. Meanwhile, microstructure in the anodic region of the samples was more stable after electrochemical treatment, which indicates that the different variation of mineralogical compositions and microstructures in different regions of the samples are the primary factors affecting the mechanic properties and electrical resistivity of the HWBM. Therefore, the electrochemical method is a potential technology to modify the engineering properties of the HWBM.

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“…In Chinese National Standard GB 23440-2009 (Inorganic waterproof and leakage-preventing materials), the setting time was limited to 5 min. As reported in the literature, lithium salts such as lithium carbonate and lithium nitrate were able to efficiently promote the hydration process of CSA [ 5 , 6 ], and obtain considerably faster setting to meet that requirement. However, this kind of accelerator seemed to be too expensive for construction materials.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

Tan

et al. 2020

Materials

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In this study, wet-ground carbide slag (i.e., WGCS) was utilized as an accelerator in calcium sulfoaluminate cement (CSA) for obtaining considerably faster setting processes for some special engineering processes such as plugging projects and rapid repair engineering. The WGCS–CSA system was designed, in which the replacement ratio of CSA by carbide slag was chosen as 4%, 8% and 12%. The setting time and compressive strength were measured, and the mechanism of the system hydration was studied in detail by means of calorimetry, XRD, thermogravimetry (TG) and SEM. The results showed that WGCS shortened the setting time of cement and significantly augmented the early strength. The addition of 8% of WGCS contributed to increasing the 2-h compressive strength from 4.2 MPa to 32.9 MPa. The decrease in the setting time and the increase in the initial strength were mainly attributed to the high initial pH value of the liquid phase and the high content of calcium ions in WGCS. Both these factors contributed to the ettringite formation and, at the same time, to the transformation of the morphology at a later time. Such results testify that WGCS can be used as an accelerator in the CSA system and also that it provides a novel approach to the reutilization of carbide slag.

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Effects of lithium carbonate on performances of sulphoaluminate cement-based dual liquid high water material and its mechanisms

Cited by 78 publications

References 21 publications

Influence of Lithium Carbonate and Sodium Carbonate on Physical and Elastic Properties and on Carbonation Resistance of Calcium Sulphoaluminate-Based Mortars

Influence of Lithium Carbonate and Sodium Carbonate on Physical and Elastic Properties and on Carbonation Resistance of Calcium Sulphoaluminate-Based Mortars

Experimental and mechanistic research on modifying the mechanic properties of the high water backfill material by electrochemical treatment

Utilization of Carbide Slag by Wet Grinding as an Accelerator in Calcium Sulfoaluminate Cement

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