Utilization of lithium slag by wet-grinding process to improve the early strength of sulphoaluminate cement paste

Tan, Hongbo; Zhang, Xun; He, Xingyang; Guo, Yulin; Deng, Xi; Su, Ying; Yang, Jin; Wang, Yingbin

doi:10.1016/j.jclepro.2018.09.027

Cited by 207 publications

(44 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…ese results implied that NS, with nanoscale particles, was able to significantly refine the pore structure [55][56][57]. Similar results concerning nanoparticles were also reported in the literature [58][59][60][61][62].…”

Section: Mipsupporting

confidence: 89%

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Liu

Zhang

Tong

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Surface protection has been accepted as an effective way to improve the durability of concrete. In this study, nanosilica (NS) was used to improve the impermeability of cement-fly ash system and this kind of material was expected to be applied as surface protection material (SPM) for concrete. Binders composed of 70% cement and 30% fly ash (FA) were designed and nanosilica (NS, 0–4% of the binder) was added. Pore structure of the paste samples was evaluated by MIP and the fractal dimension of the pore structure was also discussed. Hydrates were investigated by XRD, SEM, and TG; the microstructure of hydrates was analyzed with SEM-EDS. The results showed that in the C-FA-NS system, NS accelerated the whole hydration of the cement-FA system. Cement hydration was accelerated by adding NS, and probably, the pozzolanic reaction of FA was slightly hastened because NS not only consumed calcium hydroxide by the pozzolanic reaction to induce the cement hydration but also acted as nucleation seed to induce the formation of C-S-H gel. NS obviously refined the pore structure, increased the complexity of the pore structure, and improved the microstructure, thereby significantly improving the impermeability of the cement-FA system. This kind of materials would be expected to be used as SPM; the interface performance between SPM and matrix, such as shrinkage and bond strength, and how to cast it onto the surface of matrix should be carefully considered.

show abstract

Section: Mipsupporting

confidence: 89%

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Liu

Zhang

Tong

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…e resulted higher pore volume by BOFS is similar to some other solid wastes, such as coal fly ash (FA) [31,35], calcined coal gangue [33], ground granulated blast-furnace slag (GGBS) [44,45], waste glass powder [46], construction and demolition waste [47], etc. It is also worth noting that some ultrafine wastes, such as silica fume [48] and ground lithium slag [49], can significantly reduce the total pore volume and densify the microstructure even at early ages. e absolute porosity in different pore ranges of BOFS blended composites is shown in Figure 5.…”

Section: Pore Size Distribution (Psd)mentioning

confidence: 99%

Fluid Permeability of Ground Steel Slag‐Blended Composites Evaluated by Pore Structure

Yang

Jian

et al. 2020

Advances in Materials Science and Engineering

Self Cite

View full text Add to dashboard Cite

The resource utilization of steel slag has attracted wide attention. In the present work, the pore structure of cement paste with and without ground basic oxygen furnace slag (BOFS) up to 180 days was investigated by mercury intrusion porosimetry. Permeability was evaluated from the tested pore structure. Results indicate that the porosity, critical pore radius, pore-throat radius, and permeability are increased with the BOFS content and levels off after 28 days. Lower gel porosity and higher coarse capillary porosity were observed in BOFS-blended composites. The calculated permeability (around 0.30–7.49 × 10−19 m2) based on the pore structure agrees well with the range of reported experimental measurements. Well-correlated linear and power-law relationship was noticed between permeability and porosity and characteristic pore radius, respectively.

show abstract

“…Furthermore, in cement paste with the addition of PCE-SHMP, as shown in Figure 4b, the decline in yield stress was observed with the increasing dosage of SHMP, and this result indicated that SHMP could enhance the dispersion of PCE, which was opposite to the result of TSP. The plastic viscosity was firstly increasing and then reduced, and this phenomenon was revealed, as follows: on the one hand, due to the plasticizing effect, the agglomerated particles were dispersed, and finer particles in suspension was increased to promote the plastic viscosity [46,47]. On the other hand, the amount of free water in system would be increased to decrease the plastic viscosity due to the retarding effect.…”

Section: Conductivity Measurementmentioning

confidence: 99%

Effect of Sodium Hexametaphosphate and Trisodium Phosphate on Dispersion of Polycarboxylate Superplasticizer

Zhang

Liu

et al. 2019

Materials

View full text Add to dashboard Cite

Enhancement in dispersion of polycarboxylate superplasticizer (PCE) could be obtained by incorporating retarders in normal concrete. The generally believed reason was that the consumption of free water and polymer at the beginning was reduced by retarding cement hydration. This theory could not convincingly explain why sodium hexametaphosphate (SHMP) was able to promote the dispersion capacity of PCE, while trisodium phosphate (TSP) could not, despite that both TSP and SHMP could obviously retard the cement hydration. The adsorption behavior of PCE and phosphate was investigated and the mechanism was analyzed in order to gain deeper understanding. The results showed that TSP and SHMP delayed the cement hydration, impeded adsorption process of PCE, and increased thickness of adsorption layer. It was interesting that TSP reduced the dispersion, but SHMP enhanced. The reason for this contradiction was due to the difference in composition of adsorption layer. In the PCE-TSP system, this layer was composed of the precipitates (formed by TSP and Ca 2+ ) and the invalided PCE (caused by these precipitates in the immediate vicinity of the cement grains); the invalided PCE was due to the decrease of PCE dispersion. In the PCE-SHMP system, "Inner-phosphate (multi-layers) + Outer-PCE (single layer)" structure was formed to make the PCE work more effective, hence enhancing the dispersion. These results were expected to be useful for the design of highly efficient dispersants. dispersion capacity [26][27][28][29][30]. Based on this, the retarder might hinder the adsorption process of PCE and it was referred to as competitive adsorption [31][32][33][34][35], thereby reducing the dispersion. In addition, the thickness of the adsorption layer should also be accepted as a factor influencing the dispersion of PCE [36,37]. In spite of the decline in adsorption amount of PCE in the presence of retarder, as reported in previous study, the adsorption layer was obviously thickened to enhance the dispersion [37]. On the basis of discussion above, the conclusion could be made that the dispersion capacity of the PCE-retarder system should be associated with the retarding effect of retarder, adsorption behavior of PCE, and the thickness of the adsorption layer.Poly-phosphates, such as sodium tripolyphosphate and sodium hexametaphosphate (SHMP), have been widely used to promote the dispersion ability and dispersion retention ability of the superplasticizer system in real engineering practice. However, mono-phosphates, such as trisodium phosphate (TSP) and sodium hydrogen phosphate, cannot play the same roles as poly-phosphate in commercially available PCE products. If the retardation was the main reason for the enhancement, poly-phosphate and mono-phosphate would both have a similar effect on dispersion of PCE system, because both TPS and SHMP could retard the cement hydration [38]. Therefore, the reason why the poly-phosphate could effectively enhance the dispersion, whilst the mono-phosphate failed cannot be simply explained by the retard...

show abstract

Utilization of lithium slag by wet-grinding process to improve the early strength of sulphoaluminate cement paste

Cited by 207 publications

References 38 publications

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Fluid Permeability of Ground Steel Slag‐Blended Composites Evaluated by Pore Structure

Effect of Sodium Hexametaphosphate and Trisodium Phosphate on Dispersion of Polycarboxylate Superplasticizer

Contact Info

Product

Resources

About