Hydration kinetics, freeze-thaw resistance, leaching behavior of blended cement containing co-combustion ash of sewage sludge and rice husk

Wang, Teng; Zhou, Min; Lv, Yi; Chen, Yuchi; Wu, Shaopeng; Hou, Haobo

doi:10.1016/j.conbuildmat.2016.11.087

Cited by 40 publications

(3 citation statements)

References 43 publications

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“…Cao et al [19] and Winnefeld et al [27] did not investigate the effects of expansive agents on early hydration kinetics of binders, though their studies utilized multiple methods to determine hydration processes. Wang et al [28] illustrated the effects of sewage sludge on the early hydration kinetics of binders. However, sewage sludge is not the kind of commercial expansive agent that could be used, as the hydration reaction of binders containing sewage sludge (NG and D) is different to the hydration reaction of binders containing expansive agents, which involves three processes (NG, I, and D).…”

Section: Resultsmentioning

confidence: 99%

Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders

et al. 2019

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The addition of expansive agents could overcome the main disadvantages of raw concrete including high brittleness and low tensile strength. Few studies have investigated the early hydration kinetics of expansive cementitious binders, though the findings from the early hydration kinetics are helpful for understanding their technical performances. In this study, mixtures of 3CaO•3Al2O3•CaSO4 and CaSO4 (i.e., ZY-type™ expansive agent) with different proportions of mineral admixtures (e.g., fly ash and slag) were added into cement pastes to investigate the early hydration kinetics mechanism of expansive cementitious binders. Early hydration heat evolution rate and cumulative hydration heat were measured by isothermal calorimeter. Kinetic parameters were estimated based on the Krstulovic–Dabic model and Knudsen equations. Mechanical performances of expansive cementitious binders were tested in order to evaluate if they met the basic requirements of shrinkage-compensating materials in technical use. The early hydration heat released from cementitious binders containing ZY-type™ expansive agent was much greater than that released by pure cement, supporting the idea that addition of the expansive agent would improve the reaction of cement. The early hydration kinetic rates were decreased due to the reactions of the mineral admixture (e.g., fly ash or slag) and the ZY-type™ expansive agent in the cement system. The hydration reaction of cementitious binders containing ZY-type™ expansive agent obeyed the Krstulovic–Dabic model well. Three processes are involved in the hydration reaction of cementitious binders containing ZY-type™ expansive agent. These are nucleation and crystal growth (NG), interactions at phase boundaries (I), and diffusion (D). The 14-day expansion rates of cementitious binders containing ZY-type™ expansive agent are in the range of 2.0 × 10−4 to 3.5 × 10−4, which could meet the basic requirements of anti-cracking performances in technical use according to Chinese industry standard JGJ/T 178-2009. This study could provide an insight into understanding the effects of expansive agents on the hydration and mechanical performances of cementitious binders.

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Section: Resultsmentioning

confidence: 99%

Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders

et al. 2019

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“…In early hydration, its heat release normally accounts for only about 5% of the total heat release, which can be ignored compared to the whole hydration process. Therefore, in the study of hydration kinetics, the influence of the first exothermic peak is generally ignored, and the simulation discussion begins at the end of the induction phase [34][35][36].…”

Section: Hydration Kinetic Modelmentioning

confidence: 99%

Hydration Heat and Hydration Kinetics of Cement Paste Compound with Molybdenum Tailings Powder: A Research Article

Cheng,

Meng,

2023

Coatings

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Molybdenum tailings powder (MTs) has potential pozzolanic activity and can be used as a mineral admixture. In order to comprehend the influence of MTs powder on the cement hydration process, the hydration heat and kinetics of composite cementitious materials (CCMs) were investigated using an isothermal calorimeter and the Krstulovic–Dabic model. Furthermore, the influences of fly ash (FA), slag (SL), and MTs powder on hydration heat were compared and analyzed, considering the same content. The results show that the proper amount of MTs can promote the hydration of CCMs. When the content of MTs is 5% and 15%, the second exothermic peak of the CCMs appears 2.30% and 4.27% earlier, and the exothermic peak increases by 2.72% and 1.34%, respectively. The cumulative heat release of CCMs gradually decreases with an increasing content of MTs powder. When the replacement of MTs, FA, and SL is 15%, respectively, the second exothermic peak of CCMs increases by 1.34%, −16.13%, and −12.04% for MTs, FA, and SL, respectively. The final heat release of MTs is higher than that of FA, but lower than that of SL. The hydration process of CCMs undergoes three stages: nucleation and crystal growth (NG), interactions at phase boundaries (I), and diffusion (D).

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“…Evaluation of the influence of a superplasticizer on the hydration of varying composition cements by the electrical resistivity measurement method is described in [4]. Hydration kinetics, freeze-thaw resistance, leaching behavior of blended cement containing cocombustion ash of sewage sludge and rice husk are discussed in the article [5]. Two types of additives are studied: cement materials that are composed of co-combustion ash, co-combustion of 20% sewage sludge + 80% rice husk or co-combustion of 30% sewage sludge + 70% rice husk.…”

Section: Organic and Mineral Admixturesmentioning

confidence: 99%

The regulation of hardening kinetics of building composites based on cement binders

Adamtsevich

Shilova

2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract.The issue of regulation of hydraulic mineral binders hydration kinetics and development of solutions for stabilization of hydration process due to application of mineral and organic additives are investigated in this research. The article presents results of the theory and practice of hydration hardening building materials production analysis with the use of heat treatment methods, obtained for the developing of set measures for reducing the temperature regime of containing products produced from construction mixtures based on Portland cement, while maintaining high kinetics of the set stripping strength and simultaneous reduction of the binder consumption, and as well as a decrease in the microstructure defect of the final material and energy consumption of the technological process.

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Hydration kinetics, freeze-thaw resistance, leaching behavior of blended cement containing co-combustion ash of sewage sludge and rice husk

Cited by 40 publications

References 43 publications

Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders

Effects of Expansive Agents on the Early Hydration Kinetics of Cementitious Binders

Hydration Heat and Hydration Kinetics of Cement Paste Compound with Molybdenum Tailings Powder: A Research Article

The regulation of hardening kinetics of building composites based on cement binders

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