Hydration of cement with retarder characterized via electrical resistivity measurements and computer simulation

Zuo, Yibing; Zi, Jianmin; Wei, Xiaosheng

doi:10.1016/j.conbuildmat.2013.11.016

Cited by 28 publications

(7 citation statements)

References 15 publications

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“…The authors concluded the suitability of electrical resistivity as a method for the visualization of microstructure development in cement pastes at early ages. Electrical resistivity has also been used to evaluate the influence of different admixtures on the fresh state behavior of cement-based mixes [ 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Crystalline Admixtures at Early Age Performance of Cement-Based Mortar by Electrical Resistance Monitoring

2021

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Crystalline admixtures are employed for waterproofing concrete. This type of admixtures can affect the early age performance of cement-based mixes. The electrical resistance properties of cement have been related to the initial setting time and to the hydration development. This paper proposes a system for remote monitoring of the initial setting time and the first days of the hardening of cement-based mortars to evaluate the effect of the incorporation of crystalline admixtures. The electrical resistance results have been confirmed by other characterization techniques such as thermogravimetric analysis and compressive strength measurements. From the electrical resistance monitoring it has been observed that the incorporation of crystalline admixtures causes a delay in the initial setting time and hydration processes. The measurements also allow to evaluate the influence of the amount of admixture used; thus, being very useful as a tool to define the optimum admixture dosage to be used.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Crystalline Admixtures at Early Age Performance of Cement-Based Mortar by Electrical Resistance Monitoring

2021

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“…The change in electrical properties is determined by the current flow caused by ion transport through the water-filled porosity in suspension. This characteristic has been used to investigate the effect of admixtures in cement-based mixtures based on the measurements of electrical resistivity [13,14], and a saturating condition in cement paste and mortar was considered to measure an electrical resistivity [15,16]. It has been applied to hydration monitoring [10,[17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Alkali-Activated Slag Paste with Different Mixing Water: A Comparison Study of Early-Age Paste Using Electrical Resistivity

et al. 2020

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This paper reports the electrical resistivity measurements on KOH-activated ground-granulated blast-furnace slag, which was mixed with deionized water or natural seawater at three different activator-to-binder ratios (0.4, 0.45, and 0.5). Compressive strength and X-ray diffraction analyses were performed on the samples after the measurement. The type of mixing water did not affect the setting time of samples, whereas the setting time was delayed with an increase in activator-to-binder (a/b) ratio. Regardless of the mixing water type, the increasing ratio of electrical resistivity between a/b 0.45 and 0.5 was larger than that between a/b 0.4 and 0.45. For the same a/b ratio, the pastes mixed with seawater produced higher electrical resistivity and early strength than those with deionized water. The increase in the electrical resistivity in seawater-mixed pastes could be attributed to the formation of Cl-bearing phases such as Cl-hydrocalumite, AlOCl, and aluminum chloride hydrate. It is believed that the reaction products in seawater-mixed samples were helpful in preventing water percolation, and thus, the electrical resistivity increased compared with the deionized water-mixed sample.

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“…A detailed investigation suggested that the hydration process of cement paste can be divided into three phases, as the nucleation and growth reactions phase, boundary reactions phase and governs reactions phase [ 2 , 3 ]. In comparison to isothermal calorimetry, electrical resistivity monitors [ 4 , 5 ] are widely applied in the study of cement hydration because they reveal more information on the hydration mechanism [ 6 , 7 , 8 , 9 , 10 , 11 ] and microstructure evolution [ 12 , 13 , 14 , 15 ]. Based on the evolution of resistivity, the cement hydration process can be divided into four periods: dissolution, induction, accelerated and decelerated periods [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

A Mathematical Model for the Electrical Resistivity of Cement Paste at Early Ages Considering the Partially Saturated State

Tian

et al. 2020

Materials

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For cementitious materials, electrical resistivity is often used in the study of the cement hydration process at early age, as one of the few indicators that can be continuously and non-destructively monitored. Variation characteristics of resistivity are widely reported to interact with the early-age performance of cement paste, such as hydration kinetics parameters and setting time. However, there is no reasonable mathematical model to predict the resistivity at early ages, especially within the first 24 h, due to significant changes in the porosity and degree of saturation. In this work, a mathematical model was developed by considering the partially saturated state and density change of C-S-H (calcium silicate hydrate). To verify the model, two experimental methods were chosen, including the non-contact electrical resistivity test and isothermal calorimetry test. The hydration heat and resistivity of cement paste with a water–cement ratio of 0.35 and 0.45 were continuously monitored for 3 days. In the resistivity test, embedded temperature sensors were used to monitor the internal temperature and temperature correction was treated carefully in order to obtain accurate data. The test results prove that the mathematical model can accurately predict electrical resistivity and describe the saturation state of early-age cement pastes under sealed curing.

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Hydration of cement with retarder characterized via electrical resistivity measurements and computer simulation

Cited by 28 publications

References 15 publications

Analysis of the Influence of Crystalline Admixtures at Early Age Performance of Cement-Based Mortar by Electrical Resistance Monitoring

Analysis of the Influence of Crystalline Admixtures at Early Age Performance of Cement-Based Mortar by Electrical Resistance Monitoring

Alkali-Activated Slag Paste with Different Mixing Water: A Comparison Study of Early-Age Paste Using Electrical Resistivity

A Mathematical Model for the Electrical Resistivity of Cement Paste at Early Ages Considering the Partially Saturated State

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