Method for evaluating segregation in self-consolidating concrete using electrical resistivity measurements

Yim, Hong Jae; Bae, Young Hwan; Kim, Jae Hong

doi:10.1016/j.conbuildmat.2019.117283

Cited by 35 publications

(11 citation statements)

References 13 publications

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“…At the macroscopic scale, usually physical homogeneity is examined. In construction materials, uniform distribution of aggregates throughout the matrix is considered as a measure of physical homogeneity, 8 which is considered essential to achieve optimum mechanical and durability properties in the cementitious mixes 9,10 . However, in some cases, where the ingredients are having similar physical characteristics, measuring the macroscopic homogeneity is not so easy.…”

Section: Introductionmentioning

confidence: 99%

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Gupta

Pathak

Chaudhary

et al. 2020

Analytical Science Advances

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Expanding the capabilities of Raman scattering as an analytical tool for engineering applications can optimize the technological output immensely. Understanding the homogeneity of any blended mix is one such significant parameter in the family of composite building construction materials that needs an appropriate tool for its measurement. Raman spectromicroscopy has been established here for the purpose of studying the chemical homogeneity at the microscopic scale of a dry binary blend used in the building constructions as an example. In this study, two waste stone powdered materials, obtained from western Indian stone fields, have been characterized in their respective unmixed forms using Raman spectroscopy up to an extent so that the same can be developed as a microscopic tool to clearly “see” the chemical homogeneity of a mixture. A step‐by‐step study has been carried out by first, simply making a physically separated and identifiable boundary of the two materials followed by obtaining a Raman line image. The Raman line map could clearly identify the boundary, which otherwise was not possible to appreciate visibly. The same recipe has been extended to study the homogeneity of a binary mixture (blended in 1:1 ratio), using a Raman area map. The novelty of the work lies in the advancement in the analytical tool's family to see the chemical homogeneity of building construction materials at the microscopic level. Chemical imaging using Raman spectroscopy has been demonstrated as a simple tool to understand the homogeneity of the dry binary blend, which was not possible by other simple techniques. Using Raman area mapping proves to be a quick, valuable, and effective tool for measuring the homogeneity of the blended mixes at the microscopic scale and important for application in building construction materials.

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Section: Introductionmentioning

confidence: 99%

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Gupta

Pathak

Chaudhary

et al. 2020

Analytical Science Advances

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“…Goueygou et al [118] used a specific square probe (50 mm spacing) on prisms reinforced with rebars (10 mm diameter), repeating the measurement twice for each tested location; the same probe is used by Lataste et al [119]. A square array is used also by Yim et al [120], employing an excitation signal of 1 V (peak amplitude) at 100 Hz to scan a series of 12 electrodes placed around a cylindrical concrete specimen, in order to average the results on 12 measurements. They used brass electrodes, inserted for 10 mm in the specimen.…”

Section: -Electrode Configurationmentioning

confidence: 99%

“…Moreover, knowing the aggregate content, the 7-day (or 28-day) compressive strength can be derived from the 1-day electrical resistivity, according to a linear relationship (R 2 > 0.95). Aggregates largely increase the concrete bulk electrical resistivity with an exponential correlation [120]. On the other hand, Ramezanianpour et al [100] do not recommend to use ρ as a compressive strength indicator since the pore solution greatly affects electrical resistivity, but has no influence on compressive strength.…”

Section: Compressive Strength and Elastic Modulusmentioning

confidence: 99%

Electrical Resistivity and Electrical Impedance Measurement in Mortar and Concrete Elements: A Systematic Review

et al. 2020

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This paper aims at analyzing the state-of-the-art techniques to measure electrical impedance (and, consequently, electrical resistivity) of mortar/concrete elements. Despite the validity of the concept being widely proven in the literature, a clear standard for this measurement is still missing. Different methods are described and discussed, highlighting pros and cons with respect to their performance, reliability, and degree of maturity. Both monitoring and inspection approaches are possible by using electrical resistivity measurements; since electrical resistivity is an important indicator of the health status of mortar/concrete, as it changes whenever phenomena modifying the conductivity of mortar/concrete (e.g., degradation or attacks by external agents) occur, this review aims to serve as a guide for those interested in this type of measurements.

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“…Among them, nondestructive evaluation methods using ultrasonic wave propagation characteristics (e.g., ultrasonic wave velocity) [16,17] and electrical properties (e.g., electrical resistivity and impedance) [15,[18][19][20] have been proposed for the phase change monitoring of cement-based materials, including solid percolation and water depercolation [21]. Previous studies investigated the effect of various materials composed of different mix proportions and admixtures; however, a nondestructive approach for setting and hardening evaluation in fresh-state CSA cement mixtures and the investigation of their physicochemical changes have not been reported.…”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation for Hydration and Setting Time of Gypsum Modified Calcium Sulfoaluminate Cement Paste

et al. 2023

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Calcium sulfoaluminate (CSA) cement is a promising solution for reducing CO2 emissions. While previous studies have attempted to investigate the usefulness of CSA cement via various approaches, early age nondestructive evaluations for the setting and hydration of CSA cement mixtures have not been reported. In this study, we measured the ultrasonic pulse velocity and electrical resistivity of early age CSA cement paste. Six types of samples were prepared according to different water-to-solid ratios and different amounts of gypsum. In addition, various microstructural analyses were performed to understand CSA cement hydration with the obtained nondestructive parameters. Consequently, the effect of added gypsum in CSA cement paste was discussed in terms of ye’elimite dissolution and the precipitation of ettringite, and different pore distributions produced by added gypsum were discussed in terms of compressive strength. The 5% addition of gypsum in CSA cement paste enhanced the hydration evolution, such as ettringite, and it can induce the faster setting time up to 6 h and strength development during 24 h.

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Method for evaluating segregation in self-consolidating concrete using electrical resistivity measurements

Cited by 35 publications

References 13 publications

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Electrical Resistivity and Electrical Impedance Measurement in Mortar and Concrete Elements: A Systematic Review

Nondestructive Evaluation for Hydration and Setting Time of Gypsum Modified Calcium Sulfoaluminate Cement Paste

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