A migrating and reactive polycarboxylate superplasticizer with coupled functions of new/old concrete interfacial agent and water reducer

Huang, Haoliang; Song, Xiongfei; Song, Xuemin; Wu, Juan; Líu, Hao; Chen, Shengli; Hu, Jie; Wei, Jiangxiong; Yu, Qijun

doi:10.1016/j.cemconres.2023.107218

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…Fragments located at the samples' center were chosen randomly and immersed in ethyl alcohol to halt the hydration reaction. Subsequently, these samples were placed in a vacuum oven at 60 • C for an additional 24 h [13]. The pore structure analysis of the staged pouring concrete specimens was conducted using an AutoPore IV 9500 fully automatic mercury intrusion porosimeter, which was provided by Micrometrics instrument, Norcross, GA, USA.…”

Section: Microstructure Characterizationmentioning

confidence: 99%

“…Generally, the mechanical properties of staged pouring concrete are lower compared to ordinary concrete [8]. The interlayer bonding performance determines the overall performance of staged pouring concrete, and factors such as concrete rheological properties, temperature, relative humidity, pouring interval time, and admixtures can affect the interlayer bonding performance of staged pouring concrete [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

Chen,

Huang,

Wei

et al. 2024

Buildings

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In practical engineering construction, differences in time intervals during concrete pouring arise due to issues in concrete quality control and construction procedures, thereby affecting the mechanical and durability properties of concrete. This study conducted compressive strength tests, splitting tensile strength tests, and natural immersion tests to investigate the influence of time intervals in layered pouring on the mechanical strength and chloride ion concentration distribution of staged pouring concrete. Additionally, the study elucidated the mechanism by which pouring interval time affects the mechanical properties and resistance to chloride ion erosion of staged pouring concrete at the microstructure level. The results indicate that compared to ordinary concrete specimens, the splitting tensile strength of staged pouring concrete demonstrates a continuous decrease with increasing pouring interval time. The most significant splitting tensile strength decrease occurred at a 24 h interval. The compressive strength of staged pouring concrete initially decreases and then increases with increasing pouring interval time. At a pouring interval time of 12 h, the compressive strength of staged pouring concrete decreased the most. Results from the natural immersion tests demonstrate that chloride ion concentrations at the bonding interface and on both sides of staged pouring concrete increase continuously with the extension of pouring interval time. The chloride ion concentration at the bonding interface is consistently higher than that on both sides, and the difference between them decreases with increasing diffusion depth. The chloride ion concentration difference ΔC was proposed to evaluate the influence of bonding interface performance on chloride ion concentration, which decreases to varying degrees with increasing depth. The findings of this study can provide guidance for the research on the mechanical properties and durability of staged pouring concrete in practical engineering construction, as well as for engineering protective measures.

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Section: Microstructure Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

Chen,

Huang,

Wei

et al. 2024

Buildings

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“…[22,23] The chain transfer agents used include isopropanol, thioglycollic acid, β-mercaptopropionic acid (β-MPA), sodium hypophosphate, and sodium formate. [24][25][26] Currently, β-MPA is the most commonly used chain transfer agent, and its synthesis methods include the thiourea method, the sodium hydrosulfide method, the acrylic acid-hydrogen sulfide high-pressure method, and the β-chloropropionic acid-sodium thiosulfate method. [27,28] Among them, the sodium hydrosulfide method is easy for industrial production due to its low cost and mild reaction conditions at present.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Polycarboxylate Superplasticizer Based on Chain Transfer Agents with Various Structures

Zhang,

Huang,

Wang

et al. 2024

ChemistrySelect

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Polycarboxylate superplasticizer (PCE) is a common admixture in high performance concrete. In the design of PCE molecules, it is necessary to ensure that the molecular weight of the polymer is moderate and the acid‐ether ratio is appropriate to improve the dispersion effect. Chain transfer agent is usually added in the synthesis of PCE to adjust the molecular weight and distribution of PCE. In this study, three sulfhydryl chain transfer agents with different electron‐withdrawing groups or electron‐donating groups were synthesized by nucleophilic addition reaction based on sodium hydrosulfide method. Then, three kinds of PCE containing sulfhydryl chain transfer agent were prepared and compared with commercial β‐mercaptopropionic acid superplasticizers. The yield stress and plastic viscosity of cement paste samples prepared by PCE−A and PCE−M were close to those prepared by PCE−P. PCE−M and PCE−A prepared by chain transfer agent with electron‐withdrawing group had higher dispersion and retention capacity than PCE−P, and had more obvious delay of cement hydration and lower hydration accumulated heat. Therefore, the optimization of molecular structure of chain transfer agent is helpful to improve the properties of concrete superplasticizer.

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Shear behavior of the interface between magnesium phosphate cement and old Portland cement concrete under freeze–thaw action

Zhou,

Shen

2024

Composite Structures

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A migrating and reactive polycarboxylate superplasticizer with coupled functions of new/old concrete interfacial agent and water reducer

Cited by 9 publications

References 29 publications

The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

The Mechanical Properties and Chlorine Resistance of Concrete Based on the Effects of Pouring Interval Time

Preparation and Properties of Polycarboxylate Superplasticizer Based on Chain Transfer Agents with Various Structures

Shear behavior of the interface between magnesium phosphate cement and old Portland cement concrete under freeze–thaw action

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