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240308s2024 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.3c03773
|2 doi
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|a eng
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|a Huang, Wang
|e verfasserin
|4 aut
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|a Utilizing the Adsorbability of Pseudoboehmite for Tailoring the Stability of an Aluminum Sulfate Alkali-free Accelerator for Shotcrete
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 19.03.2024
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Shotcrete is widely used in tunnels, bridges, culverts, and other large-scale projects. The accelerator is an additive employed to expedite the setting time of shotcrete. Previous research primarily concentrated on enhancing the early strength of accelerators, whereas their long-term stability has been inadequately investigated. In this study, pseudoboehmite (PB) and amorphous aluminum hydroxide (AAH) were incorporated into the accelerator to enhance its stability over a period of 90 days without any signs of crystallization or delamination. Furthermore, the accelerator exhibited an initial setting time of 170 s, a final setting time of 550 s, and a compressive strength of 11.58 MPa after 1 day. The mechanism of effects was studied by isothermal calorimetry, FTIR, XRD, TG-DTG, and SEM analysis. The enhancement in stability is attributed to the distinctive adsorption and thixotropic properties of PB, which facilitate the formation of an electrical double-layer structure in acidic solutions. The expedited setting and hardening are primarily due to the equilibrium between Al3+, SO42-, and Ca2+ ions, which accelerates the hydration process of cement. This research offers a methodology for developing a high-performance, alkali-free liquid accelerator
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|a Journal Article
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1 |
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|a Wu, Zhihong
|e verfasserin
|4 aut
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1 |
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|a Li, Hui
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Wan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Jiawei
|e verfasserin
|4 aut
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1 |
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|a Pan, Yuexin
|e verfasserin
|4 aut
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1 |
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|a Zhou, Huafeng
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Li, Zhishun
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 40(2024), 11 vom: 19. März, Seite 5878-5889
|w (DE-627)NLM098181009
|x 1520-5827
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|g volume:40
|g year:2024
|g number:11
|g day:19
|g month:03
|g pages:5878-5889
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|u http://dx.doi.org/10.1021/acs.langmuir.3c03773
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