Hydration process of fly ash blended cement pastes by impedance measurement

Tang, Shengwen; Cai, Xinhua; He, Zhen; Shao, Hongyu; Chen, E.

doi:10.1016/j.conbuildmat.2016.03.141

Cited by 105 publications

(44 citation statements)

References 33 publications

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“…This observation suggests that NC can react with FA containing high silica and alumina, therefore, influences the strength of mortar 29,33 . It is pointed out that the FA would be hydrated at late ages 31 , which generate more C-S-H gels, thereby increasing the compactness of FA mortar.…”

Section: Resultsmentioning

confidence: 87%

High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

Yang

Che

Leng

2018

Sci Rep

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The mechanisms underlying the effects of nano-calcium carbonate (NC) on the strength of high volume fly ash (FA) mortar are discussed. Two NCs are used as 2%, 4%, 6%, and 8% by weight of cementitious materials. Hydrated products of fly ash mortar containing NC was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TG) and differential thermal gravity (DTG) analysis. Results indicate that NC could improve strength of FA mortar due to the more rapid growth of hydrated products induced by NC through additional nucleation sites. Corresponding to the highest measured strength of FA mortar, the optimal contents of NC are around 2%. In addition, the presence of 2% NC improved the microstructure of FA mortar after 180 days due to the formation of calcium carbonaluminate hydrate.

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Section: Resultsmentioning

confidence: 87%

High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

Yang

Che

Leng

2018

Sci Rep

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“…In fact, according to the previous study, the retarded pozzolanic reactions in high volume fly ash blended cement pastes were also helpful to the formation of poorly crystallized gismondine and gain of large cumulative pore volume. 21 With respect to the superplasticizer, it is noted that the cumulative pore volume is not much sensitive to the dosage of superplasticizer in Fig. 16.…”

Section: Non-contact Impedance Measurementmentioning

confidence: 99%

“…6 For the case of pore phase, some porous C-A-S-H products formed during the hydration process were able to uptake some alkali ions, perhaps resulting in low conductive performance of pastes. 21 From Figs. 9 to 14, the superplasticizer has relatively little retarded effect on the impedance response of cement pastes, compared with slag, which is examined by the sequences of 3-day modulus and phase of impedance at 1 kHz: SP0.1 (8.13 kΩ) > SP0 (7.75 kΩ) > SP0.…”

Section: Non-contact Impedance Measurementmentioning

confidence: 99%

“…both the impedance modulus and phase of blended pastes decreased as fly ash amount increased, which indicated that the occurrence of percolation was retarded. 21 It was considered that the main hydrated products in hydrated slag blended cement pastes were C-A-S-H solid solution, calcium hydroxide, AFm, AFt, hydrotalcite and monocarboaluminate. 6 For the case of pore phase, some porous C-A-S-H products formed during the hydration process were able to uptake some alkali ions, perhaps resulting in low conductive performance of pastes.…”

Section: Non-contact Impedance Measurementmentioning

confidence: 99%

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Continuous Microstructural Correlation of Slag/Superplasticizer Cement Pastes by Heat and Impedance Methods via Fractal Analysis

Tang

Cai

et al. 2017

Fractals

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This paper presents a preliminary work to evaluate the influence of slag and superplasticizer on the early-age hydration of cement pastes by an innovative non-contact impedance measurement, heat evolution method, compressive strength and setting time tests. Besides, the cumulative pore volume obtained from modulus and phase of impedance in different hydration sections is taken to continuously correlate the cumulative heat releasing of cement pastes via the fractal § Corresponding author. This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC-BY) License. Further distribution of this work is permitted, provided the original work is properly cited. analysis. Retarded phenomena and mechanism of hydration in cement pastes incorporated with slag and superplasticizer are studied, respectively. It is found that the compressive strength and setting time have a good linear relation with the slag amount in blended cement pastes. 1740003-1

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“…The concrete incorporating phosphorus slag achieves very low early strength, so the application of phosphorus slag to concrete is restricted to a certain extent. Due to low reactivity or lack of sufficient alkali activation, mineral admixtures usually exhibit a low reaction degree at early ages [31,32]. Correspondingly, the concrete containing mineral admixtures usually achieves a lower early strength compared with the plain cement concrete [33,34].…”

Section: Introductionmentioning

confidence: 99%

The Role of Phosphorus Slag in Steam-Cured Concrete

Liu

Wang

2017

Advances in Materials Science and Engineering

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Steam curing is an effective method to increase the hydration degree of binder containing phosphorus slag. The role of phosphorus slag in steam-cured concrete was investigated by determining the hydration heat, hydration products, nonevaporable water content, pore structure of paste, and the compressive strength and chloride ion permeability of concrete. The results show that elevated steam curing temperature does not lead to new crystalline hydration products of the composite binder containing phosphorus slag. Elevating steam curing temperature enhances the early hydration heat and nonevaporable water content of the binder containing phosphorus slag more significantly than increasing steam curing time, and it also results in higher late-age hydration degree and finer pore structure. For steam-cured concrete containing phosphorus slag, elevating curing temperature from 60°C to 80°C tends to decrease the late-age strength and increase the chloride permeability. However, at constant curing temperature of 60°C, the steam-cured concrete containing phosphorus slag can achieve satisfied demoulding strength and late-age strength and chloride permeability by extending the steam curing duration.

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Hydration process of fly ash blended cement pastes by impedance measurement

Cited by 105 publications

References 33 publications

High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

High volume fly ash mortar containing nano-calcium carbonate as a sustainable cementitious material: microstructure and strength development

Continuous Microstructural Correlation of Slag/Superplasticizer Cement Pastes by Heat and Impedance Methods via Fractal Analysis

The Role of Phosphorus Slag in Steam-Cured Concrete

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