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A platform for research: civil engineering, architecture and urbanism
Improving sulfate attack resistance of concrete by using calcined Mg-Al-CO3 LDHs: Adsorption behavior and mechanism
https://orcid.org/0000-0002-2128-7966
https://orcid.org/0000-0002-7153-5120
Graphical abstract Display Omitted
Highlights Calcined LDHs fulfill regeneration based on memory effect and ion adsorption. The optimal dosage for higher adsorption of SO4 2− surpasses 3.0 g/L. Langmuir isotherm is suitable to describe the adsorption behavior of SO4 2−. Endothermic behavior and spontaneous nature of SO4 2− adsorption. Calcined LDHs improves sulfate attack resistance up to 150 mg/L concentration limit.
Abstract In this work, the impact of layered double hydroxides (LDHs) on sulfate attack resistance of concrete was explored. Replacement level of cement by calcined Mg-Al-CO3 LDHs was 2%. Mechanism of ion exchange and memory effects of LDHs has been revealed from structure evolution and adsorption behavior aspects of LDHs in aqueous solution. The efficiency of calcined LDHs in sulfate attack resistance was also assessed in terms of microstructure and compressive strength loss of concrete. The experimental results show that structure regeneration of calcined LDHs can be achieved based on memory effect and ion adsorption after mixing with solution. Calcined LDHs presents high sulfate ion adsorption capacity ascribes to the availability of large amounts of vacancy between the layers. The optimal dosage of calcined LDHs for achieving high uptake efficiency of sulfate ion surpasses 3.0 g/L. Langmuir isotherm suits more to describe the adsorption of sulfate ion on calcined LDHs compared with Freundlich model. Thermodynamic parameters calculation indicates the endothermic behavior (the maximum value is obtained at 40 °C) and spontaneous nature of sulfate ion adsorption on the calcined LDHs. Calcined LDHs exhibits improving effect on pore refinement. Calcined LDHs improves concrete strength and therefore enhances sulfate attack resistance especially at longer exposure days.
Improving sulfate attack resistance of concrete by using calcined Mg-Al-CO3 LDHs: Adsorption behavior and mechanism
https://orcid.org/0000-0002-2128-7966
https://orcid.org/0000-0002-7153-5120
Graphical abstract Display Omitted
Highlights Calcined LDHs fulfill regeneration based on memory effect and ion adsorption. The optimal dosage for higher adsorption of SO4 2− surpasses 3.0 g/L. Langmuir isotherm is suitable to describe the adsorption behavior of SO4 2−. Endothermic behavior and spontaneous nature of SO4 2− adsorption. Calcined LDHs improves sulfate attack resistance up to 150 mg/L concentration limit.
Abstract In this work, the impact of layered double hydroxides (LDHs) on sulfate attack resistance of concrete was explored. Replacement level of cement by calcined Mg-Al-CO3 LDHs was 2%. Mechanism of ion exchange and memory effects of LDHs has been revealed from structure evolution and adsorption behavior aspects of LDHs in aqueous solution. The efficiency of calcined LDHs in sulfate attack resistance was also assessed in terms of microstructure and compressive strength loss of concrete. The experimental results show that structure regeneration of calcined LDHs can be achieved based on memory effect and ion adsorption after mixing with solution. Calcined LDHs presents high sulfate ion adsorption capacity ascribes to the availability of large amounts of vacancy between the layers. The optimal dosage of calcined LDHs for achieving high uptake efficiency of sulfate ion surpasses 3.0 g/L. Langmuir isotherm suits more to describe the adsorption of sulfate ion on calcined LDHs compared with Freundlich model. Thermodynamic parameters calculation indicates the endothermic behavior (the maximum value is obtained at 40 °C) and spontaneous nature of sulfate ion adsorption on the calcined LDHs. Calcined LDHs exhibits improving effect on pore refinement. Calcined LDHs improves concrete strength and therefore enhances sulfate attack resistance especially at longer exposure days.
Improving sulfate attack resistance of concrete by using calcined Mg-Al-CO3 LDHs: Adsorption behavior and mechanism
https://orcid.org/0000-0002-2128-7966
https://orcid.org/0000-0002-7153-5120
Graphical abstract Display Omitted
Highlights Calcined LDHs fulfill regeneration based on memory effect and ion adsorption. The optimal dosage for higher adsorption of SO4 2− surpasses 3.0 g/L. Langmuir isotherm is suitable to describe the adsorption behavior of SO4 2−. Endothermic behavior and spontaneous nature of SO4 2− adsorption. Calcined LDHs improves sulfate attack resistance up to 150 mg/L concentration limit.
Abstract In this work, the impact of layered double hydroxides (LDHs) on sulfate attack resistance of concrete was explored. Replacement level of cement by calcined Mg-Al-CO3 LDHs was 2%. Mechanism of ion exchange and memory effects of LDHs has been revealed from structure evolution and adsorption behavior aspects of LDHs in aqueous solution. The efficiency of calcined LDHs in sulfate attack resistance was also assessed in terms of microstructure and compressive strength loss of concrete. The experimental results show that structure regeneration of calcined LDHs can be achieved based on memory effect and ion adsorption after mixing with solution. Calcined LDHs presents high sulfate ion adsorption capacity ascribes to the availability of large amounts of vacancy between the layers. The optimal dosage of calcined LDHs for achieving high uptake efficiency of sulfate ion surpasses 3.0 g/L. Langmuir isotherm suits more to describe the adsorption of sulfate ion on calcined LDHs compared with Freundlich model. Thermodynamic parameters calculation indicates the endothermic behavior (the maximum value is obtained at 40 °C) and spontaneous nature of sulfate ion adsorption on the calcined LDHs. Calcined LDHs exhibits improving effect on pore refinement. Calcined LDHs improves concrete strength and therefore enhances sulfate attack resistance especially at longer exposure days.
Improving sulfate attack resistance of concrete by using calcined Mg-Al-CO3 LDHs: Adsorption behavior and mechanism
Guo, Liang (author) / Wu, Yueyue (author) / Duan, Ping (author) / Zhang, Zuhua (author)
2019-10-12
Article (Journal)
Electronic Resource
English
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