Hydration characteristics, hydration products and microstructure of reactive powder concrete

Ge, Wenjie; Zhang, Zhiwen; Ashour, Ashraf; Li, Wei; Jiang, Hongbo; Hu, Yuexiang; Hua-guo, Shuai; Sun, Chuanzhi; Sheng-cai, LI; Liu, Yan; Cao, Dafu

doi:10.1016/j.jobe.2023.106306

Cited by 15 publications

(9 citation statements)

References 33 publications

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“…This is because the residue soil has a much larger surface a cement in the process of replacing the cement. As a result, the water absorptio residue soil is stronger than that of cement [28,29], and it affects the hydration pr The original rust on the surface of the steel bars is removed by using a sandi cess when measuring the mass loss of the specimen. In this study, the original st are then polished with a sand blaster.…”

Section: Working Performance Of Residue-soil-reinforced Rpcmentioning

confidence: 99%

“…This is because the residue soil has a much larger surface ar cement in the process of replacing the cement. As a result, the water absorption residue soil is stronger than that of cement [28,29], and it affects the hydration pr…”

Section: Working Performance Of Residue-soil-reinforced Rpcmentioning

confidence: 99%

“…This is because the residue soil has a much larger surface area than cement in the process of replacing the cement. As a result, the water absorption of the residue soil is stronger than that of cement [28,29], and it affects the hydration process of cement and prolongs the initial setting time of RPC. The initial setting time increases sharply when the residue soil content changes from 5% to 7.5%.…”

Section: Working Performance Of Residue-soil-reinforced Rpcmentioning

confidence: 99%

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Study on Soil Corrosion Resistance Reinforced with Reactive Powder Concrete in Chloride Environment

et al. 2023

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The accumulation of residue soil (generally composed of soil, residue, or mud consolidation) is one of the important causes of damage to the environment limiting urban development. At present, the recycling rate of residue soil in developed countries is as high as 90%, while in China it is less than 5%. In marine construction, reinforced concrete often suffers from corrosion, which leads to a decrease in the service life and durability of the structure. Reactive powder concrete (RPC) with high strength and good corrosion resistance can solve these problems. In order to efficiently dispose of residue soil, protect the environment, and promote urbanization development, this study uses residue soil as a raw material to replace some cement in RPC, and studies the corrosion resistance of it (under dry–wet alternations and freeze–thaw cycles). In this study, five types of reinforced RPC with different residue soil contents (0%, 2.5%, 5%, 7.5%, and 10%) are prepared. Firstly, the working performance of blank freshly mixed residue soil RPC slurry is analyzed. Then, the corrosion resistance of residue-soil-reinforced RPC under the dry–wet alternations with 3% NaCl and freeze–thaw cycles is analyzed through parameters such as mass loss rate, electrical resistivity, ultrasonic velocity, AC impedance spectroscopy, and Tafel. The results show that under the dry–wet alternations, when the residue soil content is 10%, the corrosion rate and corrosion depth of the residue-soil-reinforced RPC are the minimum, at 43,744.84 g/m2h and 640.22 mm/year, respectively. Under the freeze–thaw cycles, the corrosion rate and corrosion depth of the 10% residue soil content group are higher than that of the 5%, being 52,592.87 g/m2h and 769.71 mm/year, respectivley. Compared to the other groups, the reinforced RPC with 10% residue soil content shows good corrosion resistance in both dry–wet alternations and freeze–thaw cycles. Replacing some of the cement in RPC with residual soil to control the amount of residual soil at 10% of the total mass of RPC can effectively improve the corrosion resistance of residue-soil-reinforced RPC and maximize the consumption of residue soil. This plan provides a feasible method for residue soil treatment in the construction industry, while also providing inspiration for research on the corrosion resistance of concrete in marine buildings.

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Section: Working Performance Of Residue-soil-reinforced Rpcmentioning

confidence: 99%

Section: Working Performance Of Residue-soil-reinforced Rpcmentioning

confidence: 99%

Section: Working Performance Of Residue-soil-reinforced Rpcmentioning

confidence: 99%

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Study on Soil Corrosion Resistance Reinforced with Reactive Powder Concrete in Chloride Environment

et al. 2023

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“…The production of RPC involves a process of compression and heating during molding and curing [4][5][6] . By eliminating coarse aggregates, RPC reduces defects at the interface between aggregates and matrix, thereby enhancing the interfacial bonding and increasing the matrix strength [7] . The addition of mineral powders improves the compactness of the matrix, leading to enhanced strength and durability [8] .…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Mix Proportion on the Mechanical Properties of Reactive Powder Concrete

Wang,

Yan

2023

Atlantis Highlights in Engineering

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Reactive Powder Concrete (RPC), as a cement-based composite material with high strength, good ductility, excellent durability, and favorable volumetric stability, exhibits promising applications in modern engineering construction. Investigating the influence of concrete mix proportions on the mechanical properties of RPC is crucial for enhancing its overall performance. This study investigates the influence of individual factors, including watercement ratio, silica fume content, sand-cement ratio, and volume fraction of steel fibers, through single-factor experiments on the mechanical properties of RPC. The results demonstrate that reducing the water-cement ratio, controlling the amount of silica fume and sand-cement ratio, and increasing the volume of steel fibers all contribute to the improved flexural and compressive strength of RPC specimens.

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“…The increase in greenhouse gas emissions from ordinary Portland cement (OPC) has led to a growing demand for sustainable cementitious materials. Cement production is responsible for more than 8% of the world's carbon dioxide emissions, making it crucial to reduce its environmental impact [1,2]. Developed in the 1990s for the building industry, reactive powder concrete (RPC) is an innovative type of cement composite with exceptional strength and superior characteristics compared to conventional concrete [3].…”

Section: Introductionmentioning

confidence: 99%

Multi-Criteria Optimization of Cost-Effective and Environmentally Friendly Reactive Powder Concrete Incorporating Waste Glass and Micro Calcium Carbonate

Abellán-García,

Daza,

Molinares

et al. 2023

Materials

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In pursuit of developing an eco-friendly and cost-effective reactive powder concrete (RPC), we utilized a multi-objective optimization technique. This approach pivoted on the incorporation of byproducts, with a spotlight on ground glass powder (GP) as a pivotal supplementary cementitious material (SCM). Our goal was twofold: engineering cost-efficient concrete while maintaining environmental integrity. The derived RPC showcased robust mechanical strength and impressive workability. Rigorous evaluations, containing attributes like compressive strength, resistance to chloride ion penetration, ultrasonic pulse speed, and drying shrinkage, highlighted its merits. Notably, the optimized RPC, despite an insignificant decrease in compressive strength at 90 days compared to its traditional counterpart, maintained steady strength augmentation over time. The refinement process culminated in a notable 29% reduction in ordinary Portland cement (OPC) usage and a significant 64% decrease in silica fume (SF), with the optimized mix composition being 590 for cement, 100 for SF, 335 for GP, and 257 kg/m3 for calcium carbonate. Additionally, the optimized RPC stood out due to the enhanced rheological behavior, influenced by the lubricative properties of calcium carbonate and the water conservation features of the glass powder. The reactive properties of SF, combined with GP, brought distinct performance variations, most evident at 28 days. Yet, both mixtures exhibited superior resistance to chloride, deeming them ideal for rigorous settings like coastal regions. Significantly, the RPC iteration, enriched with selective mineral admixtures, displayed a reduced tendency for drying-induced shrinkage, mitigating potential crack emergence.

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Hydration characteristics, hydration products and microstructure of reactive powder concrete

Cited by 15 publications

References 33 publications

Study on Soil Corrosion Resistance Reinforced with Reactive Powder Concrete in Chloride Environment

Study on Soil Corrosion Resistance Reinforced with Reactive Powder Concrete in Chloride Environment

Study on the Influence of Mix Proportion on the Mechanical Properties of Reactive Powder Concrete

Multi-Criteria Optimization of Cost-Effective and Environmentally Friendly Reactive Powder Concrete Incorporating Waste Glass and Micro Calcium Carbonate

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