Early hydration properties and performance evolution of phosphoaluminate cement concrete

Liu, Peng; Chen, Ying; Yu, Zhenkun; Ding, Zhu; Xing, Feng; Lu, Zhao–Hui; Hu, Jiashan

doi:10.1016/j.conbuildmat.2019.117318

Cited by 19 publications

(5 citation statements)

References 29 publications

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“…The smaller the pore size, the more uniform were the distribution, the higher the compressive strength, and the lower the thermal conductivity [ 33 ]. It has been demonstrated [ 34 ] that the hydration process of APC is a dynamic equilibrium process driven by the synergistic effect of chemical reactions, such as the dissolution of gelled minerals and the crystallization of hydration products. This process can be assessed by analyzing the pore structure.…”

Section: Resultsmentioning

confidence: 99%

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

et al. 2022

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Aluminophosphate cement (APC) is a new type of hydraulic cementitious material with many potential functions. Microscopic analysis techniques were used to study the effect of anhydrite on the performance and hydration process of APC under standard curing conditions. The results show that adding an appropriate amount of anhydrite promotes the hydration of APC. The highest compressive strength is reached at an anhydrite content of 15 wt.%. As the anhydrite content increases, the APC’s compressive strength decreases. The microscopic analysis of the hydration product morphology shows that the incorporation of anhydrite produces ettringite and other hydration products, improving the microstructure of the cement paste. The mercury intrusion porosimetry results show that the total porosity of the hardened APC paste decreases, and the microstructure becomes denser with an increase in the curing age, resulting in an increase in the compressive strength over time.

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Section: Resultsmentioning

confidence: 99%

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

et al. 2022

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“…However, the application of traditional cement-based coatings is restricted for various reasons. For instance, phosphate aluminate cement-based coating is renowned for its excellent durability due to is neutral pH values, yet the manufacturing process includes high-temperature calcination that emits a substantial amount of CO 2 [ 8 ]. In fact, traditional cement-based coatings are all intensive in greenhouse gas emissions.…”

Section: Introductionmentioning

confidence: 99%

Green Protective Geopolymer Coatings: Interface Characterization, Modification and Life-Cycle Analysis

et al. 2022

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In the interest of solving the resource and environmental problems of the construction industry, low-carbon geopolymer coating ensures great durability and extends the service life of existing infrastructure. This paper presents a multidisciplinary assessment of the protective performance and environmental impacts of geopolymer coating. Various parameters, such as main substance, water-solid (W/S) ratio, activator type and curing time, were investigated for their effects on interface characterization in terms of contact angle, surface energy, mechanical properties and microstructure. These parameters had negligible effects on the amounts and types of hydrophilic functional groups of geopolymer surfaces. A combination of organic surface modifiers and geopolymer coatings was shown to ensure hydrophobic surface conditions and great durability. Silicon-based modifiers exhibited better wetting performance than capillary crystalline surfactants by eliminating hydroxyl groups and maintaining structural backbone Si-O-T (Si, Al) on geopolymers’ surfaces. Finally, life-cycle analysis was conducted to investigate the environmental performance. Geopolymer coating yielded substantially lower environmental impacts (50–80% lower in most impact categories) than ordinary Portland cement (OPC) coating. Silicon-based modifiers had negligible influence due to their minimal usage. Increasing the W/S ratio diluted the geopolymer coating and decreased the environmental impacts, and slag-based geopolymer coating achieved lower environmental impacts than FA-based and MK-based varietie.

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“…Silica can be excluded since modified calcium aluminates clinkers have relatively low hydration activities. Sulfur and phosphorus can be considered since the [SO 4 ] tetrahedra and [PO 4 ] can be incorporated into the CA lattice under a calcination process to form the stable modified phase 29,30 . Between the sulfur and phosphor‐based modifiers, the phosphor‐based modifier would be an ideal candidate to modify the calcium aluminates because the hydration products of phosphorus‐modified calcium aluminates have a denser and a more intertexture micromorphology than the sulfur‐modified one.…”

Section: Introductionmentioning

confidence: 99%

“…Sulfur and phosphorus can be considered since the [SO 4 ] tetrahedra and [PO 4 ] can be incorporated into the CA lattice under a calcination process to form the stable modified phase. 29,30 Between the sulfur and phosphor-based modifiers, the phosphor-based modifier would be an ideal candidate to modify the calcium aluminates because the hydration products of phosphorusmodified calcium aluminates have a denser and a more intertexture micromorphology than the sulfur-modified one. This is because the ettringite with poor anti-chloridepermeability and later-period volumetric shrinkage properties can be formed in the hydration product of SACs.…”

Section: Introductionmentioning

confidence: 99%

Improved chloride binding stability for hydration products of calcium aluminates by phosphorus modification

Wang

Henkelman

2022

J Am Ceram Soc.

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Improved chloride binding stability for calcium aluminate cements is proposed by the doping of phosphorus. Phosphorus‐modified aluminates clinker has an improved chloride binding stability compared to pristine aluminates, ordinary Portland cement and sulfur‐modified calcium aluminates, as verified by experimental observation. The existence of the newly found phosphorus‐modified Friedel's salt (PFS) accounts for the excellent chloride binding stability, which was understood by density functional theory calculations. Local density of states of the valence band minimum is predominantly localized around P atoms in the PFS, but evenly distributed in the Friedel's salt (FS). The frontier band energy of the partial density of states on Cl and O elements in the PFS is lower than that in the FS by 0.21 and 0.05 eV, respectively. This makes the PFS more stable than the FS salt to ionic attack.

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Early hydration properties and performance evolution of phosphoaluminate cement concrete

Cited by 19 publications

References 29 publications

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

Green Protective Geopolymer Coatings: Interface Characterization, Modification and Life-Cycle Analysis

Improved chloride binding stability for hydration products of calcium aluminates by phosphorus modification

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