The Relationship between the Strength and the Pore Structures of Cement Paste with Mineral Admixtures

Li, Yue; Bao, Jun Ling; Sui, Chun E; Du, Xian

doi:10.4028/www.scientific.net/amr.250-253.104

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…This is consistent with the test results for macro strength and impermeability. The decrease in the proportion of harmful pores reduces the macroscopic defects of the paste, so as to improve the strength of the concrete [33,34,35]. At the same time, the decrease in the proportion of the more harmful and the harmful pores reduces the proportion of connected pores inside the paste, so as to improve the impermeability of concrete [36,37].…”

Section: Resultsmentioning

confidence: 99%

The Performance of Carbonation-Cured Concrete

Zhen

Chen

2019

Materials

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The research shows that carbonation-cured concrete has several mechanical and durability properties that are better than those of moisture-cured concrete. However, many properties of carbonation-cured concrete have not yet been studied. In this research, carbonation-cured concrete was prepared by pre-curing, carbonation curing, and then moisture curing. The compressive strength, CO2 uptake, pH value, chloride ion permeability and abrasion resistance of the carbonation-cured concrete were investigated. Results showed that the compressive strength of carbonation-cured concrete was more than 10% higher than that of moisture-cured concrete at the same age; a steel bar is stable in carbonation-cured concrete; and carbonation-cured concrete exhibited better abrasion resistance and chloride ion permeability than that of moisture-cured concrete. The optimization of pore structure and improvement in the micro-hardness are the reasons for the improved chloride ion permeability and abrasion resistance of carbonation-cured concrete.

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Section: Resultsmentioning

confidence: 99%

The Performance of Carbonation-Cured Concrete

Zhen

Chen

2019

Materials

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“…A knowledge of the quantitative evolution in time of the different phases during hydration is not sufficient to adequately describe the evolution of the cement properties, as the microstructure plays a key role in the development of the thermoelastic and mechanical properties of the cement (e.g. Kendall et al, 1983;Li et al, 2011). Other properties affected by the hydrated cement microstructure include, for example, the permeability, which depends on the pore size distribution and connectivity (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Understanding cement hydration at the microscale: new opportunities from `pencil-beam' synchrotron X-ray diffraction tomography

et al. 2013

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The present work describes some new improvements concerning the analysis of cement hydration processes using ‘pencil-beam’ synchrotron X-ray diffraction tomography. (i) A new filtering procedure, applied to the diffraction images, has been developed to separate the powder-like contribution from that of the grains in the diffraction images. (ii) In addition to improving the quality of the diffraction images for the subsequent analysis and tomographic reconstruction, the filtering procedure can also be used to perform a qualitative analysis of the crystallite size distribution, whenever the more standard approaches cannot be applied. (iii) Given the importance of the calcium silicate hydrate phase (C–S– H) in cements, a procedure to obtain its spatial distribution using the diffraction signal has been successfully applied, even though C–S–H is a highly disordered phase, almost amorphous to X-ray diffraction. (iv) The main result of this study has been to show that, in spite of the long measurement times required, it is possible to use in situ experiments at different aging times of cement pastes to monitor the cement evolution. This allowed the evolution of the microstructure during the acceleration and deceleration periods of the hydration process to be checked with unprecedented detail, since the quantitative spatial distribution of each phase (including C–S–H) dissolved or precipitated in the sample has been obtained. The reported approach opens up a range of opportunities for the investigation of complex multiphase systems and processes, including hydration and microstructural development in cements

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Fabrication and dielectric properties of poly(ether ether ketone)/polyimide blends with selectively distributed multi-walled carbon nanotubes

et al. 2015

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The distribution and contents of conductive fillers have a decisive influence on the dielectric properties of polymer/conductive filler composites. Herein, we clarified how the phase morphology and filler contents affect the dielectric properties of poly(ether ether ketone) (PEEK)/polyimide (TPI)/multi-walled carbon nanotubes (MWCNTs) composites, in which MWCNTs were selectively located in the TPI phase. Firstly, PEEK/TPI/MWCNTs composites with identical MWCNTs content but different PEEK/TPI ratios were prepared. The composites with co-continuous phase structure exhibited much better dielectric properties than those with sea-island structure. Then, PEEK/TPI/MWCNTs composites with the same PEEK/TPI ratio but various MWCNTs contents were prepared. The dielectric constant of the composite with 2 wt% MWCNTs reached 11306, which is because the formation of a co-continuous phase structure benefited the mini-capacitor network. Our results provide an effective method to develop high-dielectric-constant composites using the concept of double percolation.

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The Relationship between the Strength and the Pore Structures of Cement Paste with Mineral Admixtures

Cited by 4 publications

References 5 publications

The Performance of Carbonation-Cured Concrete

The Performance of Carbonation-Cured Concrete

Understanding cement hydration at the microscale: new opportunities from `pencil-beam' synchrotron X-ray diffraction tomography

Fabrication and dielectric properties of poly(ether ether ketone)/polyimide blends with selectively distributed multi-walled carbon nanotubes

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