Hydration kinetics of cement–iron tailing powder composite cementitious materials and pore structure of hardened paste

Cheng, Yurong; Sun, Xiaohui; Zhang, Jingyu

doi:10.1016/j.conbuildmat.2023.130673

Cited by 10 publications

(4 citation statements)

References 58 publications

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“…The reaction order n, the nucleation of crystallization, and the production of hydration products of the CCMs were calculated in [45]. The higher the value of n, the greater the reaction resistance of CCMs [16,46]. The n of the CCMs gradually increases with the increasing MTs powder content.…”

Section: Hydration Kinetic Parameters Of Ccmsmentioning

confidence: 99%

“…However, different types of tailings, which are fine powders, exhibit varying performances as concrete admixtures due to differences in the beneficiation process and ore composition. It has also been shown [15][16][17] that the addition of copper, iron, or bauxite tailings powders reduces the rate of hydration and heat release in cement paste. Furthermore, there are variations in the hydration process of cement depending on the type of tailings powder used.…”

Section: Introductionmentioning

confidence: 99%

“…Yan et al [30,31] discovered that the Krstulovic-Dabic model can better characterize the hydration process of the CCMs when the fly ash (FA) content is not more than 65% and when the slag (SL) content does not exceed 70%. Cheng et al [16] found that the Krstulovic-Dabic model can also simulate the hydration kinetics of cement-iron tailings powder composite cementitious materials. Therefore, the Krstulovic-Dabic model could be used to characterize the hydration process of CCMs with MTs.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Hydration Kinetic Parameters Of Ccmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Cheng,

Meng,

2023

Coatings

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“…CO 2 is the gas that will accelerate the greenhouse effect with excessive emission [17]. Treating solid waste with CO 2 can consume excessive CO 2 gas, thus improving the corresponding performance [18][19][20][21]. CO 2 -cured bird nest may provide further improvement for the performance of RPC.…”

Section: Introductionmentioning

confidence: 99%

The Influence of CO2-Cured Boiler Cinder on the Mechanical Strength of RPC Exposed to NaCl Erosion

2023

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Boiler cinder is a kind of mining waste that may cause environmental pollution. Based on this reason, a processing method needs to be carried out. In this study, the influence of CO2-cured boiler cinder on the compressive and flexural strengths of reactive powder cement concrete (RPC) under NaCl actions is investigated. The mass loss rates (MLR) and the relative dynamic modulus of elasticity (RDME) are measured to reflect the resistance of NaCl erosion. The thermogravimetric analysis (TGA), scanning electron microscope (SEM), and X-ray diffraction (XRD) spectrum are obtained for revealing the mechanism of the macro performance. Results show that the relationship between the MLR and the mass ratio of CO2-cured boiler cinder fits the quadratic function with NaCl erosion. Meanwhile, the MLR during NaCl action are decreased by increasing the amount of CO2-cured boiler cinder. The MLR range from 0% to 5.3% during NaCl action, and the decreasing rate of MLR by CO2 curing on boiler cinder is 0%–51.3%. The function of RDME and the mass ratio of CO2-cured boiler cinder accords with the positive correlation quadratic function. The mechanical strengths decrease when NaCl erosion is encountered. The mechanical strengths’ decreasing rates of RPC are elevated with the increasing number of NaCl freeze–thaw cycles and the NaCl dry–wet alternations. The increasing rates of flexural and compressive strengths of RPC by 13.1%–36.3% and 11.2%–50.4% are achieved by adding CO2-cured boiler cinder. As observed from the TGA and SEM’s results, the addition of CO2-cured boiler cinder can increase the thermogravimetric value and the compactness of hydration products.

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Kinetic study on the hydration of supersulfated cements

Zhu,

Qi,

Kou

2024

J Therm Anal Calorim

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Hydration kinetics of cement–iron tailing powder composite cementitious materials and pore structure of hardened paste

Cited by 10 publications

References 58 publications

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

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

The Influence of CO2-Cured Boiler Cinder on the Mechanical Strength of RPC Exposed to NaCl Erosion

Kinetic study on the hydration of supersulfated cements

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