Investigation of properties of fluorogypsum-slag composite binders – Hydration, strength and microstructure

Garg, Man Mohan; Pundir, Aakanksha

doi:10.1016/j.cemconcomp.2013.10.010

Cited by 52 publications

(22 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen from the figure that, for the unleached slice specimen, its microstructure when mixed with slag is more compact than that without slag, and many plate-like calcium hydroxide crystals and flocculent C-S-H gel grow criss-crossedly on the slice specimen with no slag, and a little of needle ettringite appear in the pore of C-S-H gel. The slice specimen with 40% slag also contain some calcium hydroxide crystals, C-S-H gel and some unhydrated slag particles, which are in close contact with the surrounding cement paste [47], and this observation is consistent with the measured results from the porosity in Figure 3 and XRD phase in Figure 5 for unleached slice specimens. After accelerated leaching for 3 days, the microstructure of slice specimen with no slag is loose and porous, with many loose products, while the calcium hydroxide crystals obviously decreased.…”

Section: Microstructure Morphologysupporting

confidence: 87%

Influence of slag content and water-binder ratio on leaching behavior of cement pastes

Tang

Zuo

et al. 2016

Construction and Building Materials

View full text Add to dashboard Cite

In order to obtain quickly the influences of blast furnace slag and water-binder ratio on the leaching behavior of cement-based material and its corrosion resistance in water environments, an accelerated calcium leaching experiment on a slice specimen with slag-cement pastes in 6M NH 4 Cl solution was carried out. Using the saturation-drying weighing method, X-ray diffraction (XRD) and the scanning electron microscope (SEM/EDS) measurement, the influences of water-binder ratio and slag content on the porosity, phase composition, microstructure morphology and Calcium-Silicon ratio of slag-cement pastes in the process of calcium leaching were analyzed. Results show that, compared to cement pastes without slag, the slag-cement paste with the appropriate slag content has a low rate of microstructure deterioration and a good leaching resistance. The optimum slag contents in slag-cement pastes are respectively 40% and 50% corresponding to the low and high water-binder ratio. The porosity, Calcium-Silicon ratio and microstructure morphology of slag-cement pastes exhibit small change in the process of accelerating leaching, and this indicates that the slag-cement pastes with the optimum slag content can provide the best performance of calcium leaching resistance in the soft-water environment.

show abstract

Section: Microstructure Morphologysupporting

confidence: 87%

Influence of slag content and water-binder ratio on leaching behavior of cement pastes

Tang

Zuo

et al. 2016

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…In the present studies, the structure formation process was studied in terms of the kinetics of heat release while hardening of binders [13,14,15,16].…”

Section: Resultsmentioning

confidence: 99%

Investigation of structure formation processes at the hydration of modified gypsum binders and mortars

Коrovyakov¹,

Заикина²,

Solovyov

2017

MATEC Web Conf.

View full text Add to dashboard Cite

Abstract.The results of investigations of structure formation processes of a mortar while hardening have been presented in the article. The results obtained indicate that during the period of structure formation and the heat release of solidifying composite gypsum binders and solutions, the heat release in hardening of composite gypsum binders (CGB) and modified gypsum mortars (MGM) proceeds at different rates, and is characterized, in some cases, by the rapid release of hydration heat. As studies have shown, modified gypsum binders and mortars, in order to avoid the appearance of structure defects, should contain setting-time additives, promoting to a decrease in the intensity of heat release and, as consequence, reducing risks of destructive processes. With a large amount of a setting-time retarder, hydration process may be disturbed, and that can be accompanied by following abnormalities (abundant bleeding, slow gain in strength, etc.). Significant heat release during hardening allows using the developed mortars even at negative temperatures, as also evidenced by the results of other researchers.

show abstract

“…At 14 days of hydration, the cement paste microstructure when mixed with BFS is more compact than that without BFS, and many plate-shaped calcium hydroxide crystals are noticed throughout the sample, as opposed to the C100BFS00 cement paste sample. The C40BFS60 sample also contains a number of unhydrated slag particles lying in close contact with the surrounding cement paste [39]. At 28 days of hydration, the C40BFS60 microstructure becomes denser, and microcracking decreases as considerably more C-S-H gel fills the pores, forming an aggregated homogeneous gel; meanwhile, the Ca(OH) 2 content decreases due to the pozzolanic effect.…”

Section: Sem Observationsmentioning

confidence: 99%

Investigating the early-age diffusion of chloride ions in hardening slag-blended mortars on the light of their hydration progress

Fraj

Bonnet

Leklou

et al. 2019

Construction and Building Materials

View full text Add to dashboard Cite

The present work seeks to investigate the ingress of chlorides during the hardening of slag-blended mortars that may have been exposed to chlorides since an early age. In order to correlate chloride ingress with the microstructure development, both the hydration reaction and chemical shrinkage of the investigated mixtures are monitored, and their microstructure is characterized through SEM observations. Results indicate a slow hydration reaction in the presence of slag, which decelerates the formation of hydrates and the filling of capillary pores. Despite the decrease in chemical shrinkage, chloride ingress still increases, thus amplifying the risk of corrosion in slag-blended matrices. The hydrates gradually develop within the hardening microstructure and obstruct the chloride diffusion paths, resulting in a lower chloride diffusion coefficient. The apparent chloride-diffusion coefficient measured after 28 days of exposure is 12 Â 10 À12 m 2 /s, 14.2 Â 10 À12 m 2 /s and 14 Â 10 À12 m 2 /s for hardening mortars, with respectively 0%, 30% and 60% of slag. These coefficients are respectively 2 times, 2.8 times and 4.7 times higher than those of hardened mortars.

show abstract

Investigation of properties of fluorogypsum-slag composite binders – Hydration, strength and microstructure

Cited by 52 publications

References 15 publications

Influence of slag content and water-binder ratio on leaching behavior of cement pastes

Influence of slag content and water-binder ratio on leaching behavior of cement pastes

Investigation of structure formation processes at the hydration of modified gypsum binders and mortars

Investigating the early-age diffusion of chloride ions in hardening slag-blended mortars on the light of their hydration progress

Contact Info

Product

Resources

About