Pore structure evaluation of cementing composites blended with coal by-products: Calcined coal gangue and coal fly ash

Yang, Jin; Su, Ying; He, Xingyang; Tan, Hongbo; Jiang, Youzhi; Zeng, Linghao; Strnadel, Bohumír

doi:10.1016/j.fuproc.2018.09.013

Cited by 125 publications

(37 citation statements)

References 54 publications

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“…It is also worth noting that the peak of gel pores (below 10 nm) and fine capillary pores (between 10 and 100 nm) becomes sharper and more pronounced. Similar results were also reported in [33], in which two main peaks for gel pores and fine capillary pores were finally identified in fly ash or calcined coal gangue-blended composites.…”

Section: Pore Size Distribution (Psd)supporting

confidence: 89%

“…It is well known that mercury intrusion porosimetry is one of the most commonly used techniques for pore structure characterization [18,[30][31][32][33][34]. Another effective pore structure determination method is nitrogen adsorption and desorption (NAD) which is suitable for pore size smaller than 60-100 nm [35,36].…”

Section: Mercury Intrusion Porosimetry (Mip)mentioning

confidence: 99%

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

Yang

Jian

et al. 2020

Advances in Materials Science and Engineering

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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.

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Section: Pore Size Distribution (Psd)supporting

confidence: 89%

Section: Mercury Intrusion Porosimetry (Mip)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

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“…where C is a constant; P i and V i stand for the mercury pressure and intruded pore volume at step i; and D stands for the fractal dimension of the pore surface [45][46][47][48]. erefore, equation 9is expressed as equation (12).…”

Section: Nmrmentioning

confidence: 99%

“…e microporous structure was related to transport properties of cement paste, which could be reflected by fractal dimension. In this study, fractal characteristics of the pore structure was calculated from MIP data [45,48,63], and the results are posted in Figure 6. It was observed that two fractal areas were separated by a transition area.…”

Section: Mipmentioning

confidence: 99%

“…It was observed that two fractal areas were separated by a transition area. It was reported that Ds-a of the macrofractal region represented the packing patterns of the hydrated binder particles, while the Ds-i of the differential region mainly showed the microstructure of the C-S-H gel [45,46]. 2% and 4% NS increased the Ds-a of the samples from 2.006 in reference to 2.066 and 2.329 and increased Ds-i from 2.685 in reference ese phenomena indicated that the addition of NS disordered the transport tunnel and made the pore structure more tortuous at the age of 28 d, which could reduce the transport properties of the hardened paste.…”

Section: Mipmentioning

confidence: 99%

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Effect of Nanosilica on Impermeability of Cement-Fly Ash System

Liu

Zhang

Tong

et al. 2020

Advances in Civil Engineering

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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.

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A novel high polymer nanocomposite inhibitor for coal gangue spontaneous combustion prevention: A case study of Yangquan coal gangue in China

Huang

Gao

et al. 2020

Fire and Materials

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Coal gangue spontaneous combustion produces toxic and harmful gases. This research aims to study a new type of polymer nanocomposite inhibitor to prevent and control coal gangue spontaneous combustion. Nanomodification of montmorillonite (MMT) was carried out on high polymer emulsion inhibitor polyacrylamide (PAM) to improve its thermal stability and overcome the short inhibition duration problem. First, through scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), and proximate analysis experiments, it was found that the coal gangue in the Yangquan mining area was prone to spontaneous combustion. Then, PAM/MMT was produced by an intercalation method. The results of X-ray diffraction (XRD) and differential scanning calorimetry (DSC) showed that the interval spacing of MMT increased, which was sufficient for the insertion of acrylamide monomer. The vitrification temperatures of PAM and PAM/MMT prove that PAM/MMT exhibited higher thermal stability. The results of Fourier transform infrared spectroscopy (FTIR) experiments indicated that the PAM/MMT composite inhibitor agent effectively inhibited the oxidative activity of reactive groups on the coal gangue surface. As a result, PAM/MMT could suppress coal gangue oxidative spontaneous combustion, so as to reduce environmental problems caused by coal gangue spontaneous combustion. Furthermore, a spraying process is designed for the application of the inhibitor.

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Pore structure evaluation of cementing composites blended with coal by-products: Calcined coal gangue and coal fly ash

Cited by 125 publications

References 54 publications

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

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

Effect of Nanosilica on Impermeability of Cement-Fly Ash System

A novel high polymer nanocomposite inhibitor for coal gangue spontaneous combustion prevention: A case study of Yangquan coal gangue in China

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