Properties and microstructure of basic magnesium sulfate cement: Influence of silica fume

Tan, Yongshan; Yu, Hongfa; Sun, Shi‐Kuan; Wu, Chengyou; Ding, Hao

doi:10.1016/j.conbuildmat.2020.121076

Cited by 44 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the high pozzolanicity of SF, this phenomenon is believed to result in a more compact and enhanced microstructure compared to PC. In well-documented studies [25][26][27], SF reduces porosity by refining pore structure, resulting in increased compressive "strength". Further, incorporating 5% of SF improved strength at 28 days, while 10% and 15 were not significantly beneficial.…”

Section: Compressive Strengthmentioning

confidence: 99%

Impact of Hot Weather Conditions on the Performance of Supplementary Cementitious Materials Concrete

2023

View full text Add to dashboard Cite

This study aimed to investigate the strength and permeability properties of binary and ternary systems for producing concrete mixes with a cure time of 7, 28, 90, and 180 days under high ambient temperatures (about 35–45 °C). The key variables were silica fume (SF) and fly ash (FA) and the water-to-binder ratio (0.18 to 0.55) needed for cementitious systems of normal to ultra-high-performance concrete (UHPC). The tests were conducted under BS 1881 and ASTM C 1202. Further, a parametric study was conducted using isoresponse curves and predictive models developed in the study. After 28 days with 5% SF, the SF-binary concrete mixes showed significant gains in compressive strength, while 10% and 15% showed no significant gains. With a water–binder ratio of 0.55, concrete showed slightly higher strength gains than concrete with ratios of 0.16, 0.25, and 0.40. A 5% SF addition to 0.25-based concrete reduced permeability by 70%, which was marginal for 10% and 15%. However, higher SF content did not significantly affect concrete permeability with water–binder ratios of 0.55 and 0.40. The SF-FA ternary cementitious system of UHPC resulted in negligible permeability. With the developed model, the predicted–tested strength and permeability ratio was between 0.96 and 1.01. The isoresponse pattern of permeability changes at 6% SF content, while adding SF increases permeability significantly. The parametric analysis revealed that strength development deteriorates after 120 days regardless of whether SF is added at 10% or 15%.

show abstract

Section: Compressive Strengthmentioning

confidence: 99%

Impact of Hot Weather Conditions on the Performance of Supplementary Cementitious Materials Concrete

2023

View full text Add to dashboard Cite

show abstract

“…The main exothermic peak is the heat release of the formation of 5-1-7 [14], the duration of the induction period is dependent on the time required for the nucleation of 5-1-7. The content of Mg 2+ , SO 4 2and OH-in the liquid phase is critical.…”

Section: Hydration Processmentioning

confidence: 99%

“…The results showed that both types of fly ash could improve the compressive strength and softening coefficient of BMS. Tan et al [14] investigated the effect of silica fume (SF) on the properties and hydration mechanism of BMS. The results showed that the filling effect of SF led to a more compact microstructure of the matrix, which increased the compressive strength of the BMS.…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF MgO/MgSO₄ MOLAR RATIO ON THE HYDRATION AND MECHANICAL PROPERTIES OF BMS CONTAINING STEEL SLAG

He¹

2022

Ceramics - Silikaty

View full text Add to dashboard Cite

The work aims to investigate the effect of MgO/MgSO 4 molar ratio (MSMR) on the hydration and mechanical properties of basic magnesium sulfate (BMS) cement and basic magnesium sulfate with the incorporation of steel slag (BMS-SS). The exothermic rate and cumulative heat release were monitored, and the hydration products and pore structures were analysed. In addition, the compressive strength was measured. The results show that the hydration process of BMS and BMS-SS are both affected by the MSMR; samples with an MSMR of 7 have the highest cumulative heat both for the BMS and BMS-SS. A higher MSMR has a negative effect on the formation of 5-1-7 and leads to the formation of Mg(OH) 2 . The incorporation of SS leads to the formation of gypsum, especially for the samples with a low MSMR. Both the porosity and its distribution are affected by the MSMR, the porosity of the samples with an MSMR of 5 are significantly higher than those with an MSMR of 7 and 9, and the average pore diameter of the sample with an MSMR of 7 is the lowest whether or not SS is incorporated. The compressive strength of the samples with an MSMR of 7 and 9 are nearly equal and prominently higher than the samples with an MSMR of 5. The SS incorporation leads to a decrease in the compressive strength for all the samples.

show abstract

“…The additives, which work as initializers of crystallization, can affect the hydration processes and create the conditions for the formation of a structure with predefined properties. Today, there are a significant number of papers on the structuring of the cement matrix due to the effects of ultrafine additives on the morphology of cement hydration products [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

et al. 2021

View full text Add to dashboard Cite

The present research is focused on the investigation of the influence of ultrafine additives on the structure formation of hardened cement paste and the establishment of the mechanisms of the morphological transformations, which determine the properties of hydrated products. In the course of the research, the modification of ordinary Portland cement was performed by the suspension of multi-walled carbon nanotubes (MWCNTs), carbon black (CB) paste, and silica fume (SF). Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD) analysis, thermal analysis, and Fourier-transform infrared (FTIR) spectroscopy were used to study cement hydration products. The morphology of hardened cement paste depends on the chemical reactivity of additives, their geometry, and their genesis. The action mechanism of the inert carbon-based additives and pozzolanic silica fume were considered. The cement hydration products formed in the process of modification by both types of ultrafine additives are described. In the case of the modification of cement paste by inert MWCNTs and CB paste, the formation of cement hydration products on their surface without strong adhesion was observed, whereas in the case of the addition of SF separately and together with MWCNTs, the strong adhesion of additives and cement hydration products was noted.

show abstract

Properties and microstructure of basic magnesium sulfate cement: Influence of silica fume

Abstract: Graphical abstract

Cited by 44 publications

References 27 publications

Impact of Hot Weather Conditions on the Performance of Supplementary Cementitious Materials Concrete

Impact of Hot Weather Conditions on the Performance of Supplementary Cementitious Materials Concrete

EFFECT OF MgO/MgSO₄ MOLAR RATIO ON THE HYDRATION AND MECHANICAL PROPERTIES OF BMS CONTAINING STEEL SLAG

Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

Contact Info

Product

Resources

About