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学者姓名:王德辉

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Effect of K/Na on the alkali silica reaction of seawater and sea sand concrete SCIE
期刊论文 | 2025 , 58 (4) | MATERIALS AND STRUCTURES
Abstract&Keyword Cite Version(2)

Abstract :

In recent years, research into the properties of seawater and sea sand concrete (SWSSC) has emerged as a prominent area of investigation, and the alkali silica reaction (ASR) of SWSSC is an urgent issue to be solved. However, little attention has been paid to the effect of K/Na on the ASR of SWSSC. In order to fill this gap, the effects of different K/Na on ASR products, pore structure, pH and alkali ion content, and expansion of SWSSC were measured. The findings demonstrated that the composition of the amorphous product ASR-P1 (K0.52Ca1.16Si4O8(OH)2.84-1.5H2O) of SWSSC exhibited an inverse relationship with K/Na, whereas the crystalline product K-shlykovite (NaCaSi4O8(OH)3-2.3H2O) displayed a direct correlation with K/Na. The increase of K+ concentration leads to the decrease of silica dissolution, which is the main reason for the lowest ASR degree in the high K/Na group. The transformation of ASR-P1 to K-shlykovite also resulted in different main ASR products in different K/Na groups. The experimental data show that increasing the K/Na from 0.85 to 1.85 reduced the 14d expansion from 0.248 to 0.22% and 28d ASR expansion from 0.415 to 0.350%. Notably, the most significant suppression occurred in the high K/Na group, which exhibited the lowest expansion values at all ages. The findings of this study provide a foundation for the theoretical application of SWSSC in the field of ocean engineering. These results suggest that adjusting K/Na ratios could serve as a viable strategy to mitigate ASR induced damage in marine concrete structures. For such structures, this implies that material selection should prioritize potassium-rich binders, such as blended cements or SCMs like potassium feldspar, to naturally elevate the K/Na ratio. In mix design, controlled additions of KOH during mixing can adjust the alkali balance, while leveraging seawater with inherently higher K/Na ratios or supplementing seawater with potassium salts can help achieve the target K/Na ratio. The findings of this study provide a foundation for the theoretical application of SWSSC in the field of ocean engineering to enhance long-term durability in ocean engineering applications.

Keyword :

Alkali silica reaction Alkali silica reaction ASR-P1 ASR-P1 Expansion Expansion K-shlykovite K-shlykovite Seawater and sea sand concrete Seawater and sea sand concrete

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GB/T 7714 Zhang, Qizhi , Gong, Qingnan , Chen, Rong et al. Effect of K/Na on the alkali silica reaction of seawater and sea sand concrete [J]. | MATERIALS AND STRUCTURES , 2025 , 58 (4) .
MLA Zhang, Qizhi et al. "Effect of K/Na on the alkali silica reaction of seawater and sea sand concrete" . | MATERIALS AND STRUCTURES 58 . 4 (2025) .
APA Zhang, Qizhi , Gong, Qingnan , Chen, Rong , Wang, Ming , Chen, Ran , Weng, Lincheng et al. Effect of K/Na on the alkali silica reaction of seawater and sea sand concrete . | MATERIALS AND STRUCTURES , 2025 , 58 (4) .
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Effect of K/Na on the alkali silica reaction of seawater and sea sand concrete Scopus
期刊论文 | 2025 , 58 (4) | Materiaux et Constructions
Effect of K/Na on the alkali silica reaction of seawater and sea sand concrete EI
期刊论文 | 2025 , 58 (4) | Materiaux et Constructions
Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature SCIE
期刊论文 | 2024 , 437 | CONSTRUCTION AND BUILDING MATERIALS
Abstract&Keyword Cite Version(2)

Abstract :

The shortages of river sand and freshwater in marine engineering can be addressed by utilizing seawater and sea sand concrete (SWSSC). However, the sulfate resistance of SWSSC at low temperature is not clear. In this study, the seawater and sea sand cement mortar (SSCM) and ordinary cement mortar (OCM) with different limestone powder (LP) content were corroded by different sulfate solutions at 5 degrees C. The change of compressive strength and compositions of corrosion products in mortars after different times of corrosion were studied. The results show that SSCM presents 9.4 similar to 19 % lower strength loss and better sulfate resistance than OCM. The presence of Friedel's salt in SSCM contributes to a reduction in corrosion products like ettringite, gypsum, and thaumasite, thereby minimizing microstructural damage and mitigating the thaumasite sulfate attack (TSA). All mortars containing LP suffer from TSA and significantly damage with 17.4 similar to 48.7 % strength loss after 360 days of MgSO4 or Na2SO4 corrosion. Increasing the LP content exacerbates the TSA damage in SSCM. This is primarily due to the additional soluble carbonate from LP promoting the formation of gypsum and thaumasite, thereby worsening the microstructure deterioration of SSCM. Meanwhile, the thaumasite is not found in SSCM without LP after corrosion. In contrast to Na2SO4 corrosion, the thaumasite formation under MgSO4 corrosion mainly results from indirect reaction. The combined corrosion effects of Mg2+ and SO42- lead to a more significant increase in expansive products (thaumasite and gypsum) and TSA damage. The findings of this study help to advance the sulfate resistance of SWSSC in marine environments.

Keyword :

Limestone powder Limestone powder Low temperature Low temperature Seawater and sea sand concrete Seawater and sea sand concrete Thaumasite sulfate attack Thaumasite sulfate attack

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GB/T 7714 Wang, Dehui , Zhang, Zhiwen , Chen, Rong et al. Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 437 .
MLA Wang, Dehui et al. "Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature" . | CONSTRUCTION AND BUILDING MATERIALS 437 (2024) .
APA Wang, Dehui , Zhang, Zhiwen , Chen, Rong , Wang, Ming , Chen, Ran , Weng, Lincheng et al. Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 437 .
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Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature EI
期刊论文 | 2024 , 437 | Construction and Building Materials
Thaumasite sulfate attack characteristic of seawater and sea sand concrete with limestone powder in different sulfate environment at low temperature Scopus
期刊论文 | 2024 , 437 | Construction and Building Materials
Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments SCIE
期刊论文 | 2024 , 416 | CONSTRUCTION AND BUILDING MATERIALS
WoS CC Cited Count: 12
Abstract&Keyword Cite Version(2)

Abstract :

Seawater sea sand concrete (SWSSC) is considered a potential solution to the shortage of river sand and freshwater resources in the coastal and island regions. Under the marine environment, the sulfate ions in the seawater and sea sand are detrimental to the properties of concrete. Due to the lack of systematic research on the sulfate attack characteristics of SWSSC exposed to different marine conditions, this study compare the sulfate resistance between SWSSC and freshwater desalinated sea sand concrete (FDC) under full immersion, semi -immersion, and dry -wet cycle exposure through the compressive strength, sulfate ion distribution, and microstructural changes after erosion. The findings showed that among the three different exposure conditions, the damage in SWSSC-F (fully immersion) was more severe than that in SWSSC-S (semi -immersion) and SWSSC-DW (dry -wet cycle). The SO42- concentration in inner SWSSC-F was 9.3% and 21.3% higher than that in SWSSC-DW and SWSSC-S, respectively. The microstructural analysis indicated that the higher amount of sulfate attack products and the leaching of Ca2+/OH- in SWSSC-F significantly damaged its microstructure. Besides, carbonation and physical crystallization in SWSSC-S and SWSSC-DW also refined their pore structure, thus enhancing their sulfate resistance. SWSSC showed better sulfate resistance than FDC under different marine exposure conditions in terms of lower erosion product content and better pore structure distribution after 12 months of erosion. The formation of Friedel's salt in SWSSC suppressed the formation of expansion products and reduced the erosion damage of concrete by SO42-.

Keyword :

Dry -wet cycle Dry -wet cycle Freshwater and desalinated sea sand concrete Freshwater and desalinated sea sand concrete Full immersion Full immersion Seawater sea sand concrete Seawater sea sand concrete Semi -immersion Semi -immersion Sulfate attack Sulfate attack

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GB/T 7714 Zhang, Dong , Jiang, Jianwei , Zhang, Zhiwen et al. Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 416 .
MLA Zhang, Dong et al. "Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments" . | CONSTRUCTION AND BUILDING MATERIALS 416 (2024) .
APA Zhang, Dong , Jiang, Jianwei , Zhang, Zhiwen , Fang, Lei , Weng, Yiwei , Chen, Longhui et al. Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 416 .
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Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments EI
期刊论文 | 2024 , 416 | Construction and Building Materials
Comparative analysis of sulfate resistance between seawater sea sand concrete and freshwater desalted sea sand concrete under different exposure environments Scopus
期刊论文 | 2024 , 416 | Construction and Building Materials
Study on bending performance of 3D printed PVA fiber reinforced cement-based material SCIE
期刊论文 | 2024 , 433 | CONSTRUCTION AND BUILDING MATERIALS
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Abstract :

To deepen the application and development of 3D Printing Construction Technology, the rheological characteristics, compressive strength and bending performance of 3D printed polyvinyl alcohol fiber (PVA fiber) reinforced cement-based material were explored. The direction of the intralayer interfaces and the fiber's distribution direction caused the anisotropy of 3D printed PVA fiber reinforced cement-based material. The printed specimens presented different failure patterns in different compressive directions, and there was certain anisotropy in the X, Y and Z directions. For the bending performance, the load-midpoint deflection curves of casted specimens and the Z(x) direction of printed specimens showed the strain hardening behavior, while the Z(y) direction of printed specimens did not. Compared with the Z(y) specimen, the bending strength of the Z(x) specimen was about 3 similar to 4 times higher, and the peak deflection was about an order of magnitude higher. The anisotropy of the printed specimen can be used to improve the bending performance in a specific loading direction to a certain extent.

Keyword :

3D printing technology 3D printing technology Anisotropy Anisotropy Bending performance Bending performance Compressive strength Compressive strength Rheological characteristics Rheological characteristics

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GB/T 7714 Luo, Surong , Li, Wenqiang , Wang, Dehui . Study on bending performance of 3D printed PVA fiber reinforced cement-based material [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 433 .
MLA Luo, Surong et al. "Study on bending performance of 3D printed PVA fiber reinforced cement-based material" . | CONSTRUCTION AND BUILDING MATERIALS 433 (2024) .
APA Luo, Surong , Li, Wenqiang , Wang, Dehui . Study on bending performance of 3D printed PVA fiber reinforced cement-based material . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 433 .
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Study on bending performance of 3D printed PVA fiber reinforced cement-based material EI
期刊论文 | 2024 , 433 | Construction and Building Materials
Study on bending performance of 3D printed PVA fiber reinforced cement-based material Scopus
期刊论文 | 2024 , 433 | Construction and Building Materials
Research Progress on the Effects of Different Ions on Alkali-Silica Reaction of Concrete EI CSCD PKU
期刊论文 | 2024 , 38 (2) | Materials Reports
Abstract&Keyword Cite Version(1)

Abstract :

Alkali-silica reaction (ASR)of concrete is essentially the reaction of ions and water molecules in the pore solution with active silica in the aggregate. According to the influence of different ions on ASR,ions can be divided into alkali ions (Na+,K+ and OH-),lithium ion and aluminum ion,calcium ion. Alkali ions promote the alkali-silica reaction of concrete,resulting in more severe expansive damage to concrete. Lithium and aluminum ions slow down the expansive damage caused by alkali-silica reaction of concrete. The role of Ca2+ is closely related to n(Ca)/ n(Si)(molar ratio). When the n(Ca)/ n(Si)2+ promotes ASR. When the n(Ca)/ n(Si)%0. 2,Ca2+ inhibits ASR. Firstly,the latest research progresses of ASR products are introduced,including the types,micro morphology,atomic structure and water stability of ASR products. Then,influences of these ions on the ASR process,the composition of ASR products,the crystallization properties and expansion of ASR products are reviewed. Finally,the future research direction of the influence of different ions on ASR is prospected. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.

Keyword :

Aluminum Aluminum Calcium Calcium Ions Ions Lithium Lithium Molar ratio Molar ratio Molecules Molecules Silica Silica Silicon Silicon

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GB/T 7714 Gong, Qingnan , Wang, Dehui . Research Progress on the Effects of Different Ions on Alkali-Silica Reaction of Concrete [J]. | Materials Reports , 2024 , 38 (2) .
MLA Gong, Qingnan et al. "Research Progress on the Effects of Different Ions on Alkali-Silica Reaction of Concrete" . | Materials Reports 38 . 2 (2024) .
APA Gong, Qingnan , Wang, Dehui . Research Progress on the Effects of Different Ions on Alkali-Silica Reaction of Concrete . | Materials Reports , 2024 , 38 (2) .
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Research Progress on the Effects of Different Ions on Alkali-Silica Reaction of Concrete; [不同离子对混凝土碱硅酸反应影响的研究进展] Scopus CSCD PKU
期刊论文 | 2024 , 38 (2) | Materials Reports
Improving the properties of corn cob aggregate concrete by utilizing different chemical modification methods EI CSCD PKU
期刊论文 | 2024 , 40 (11) , 220-226 | Transactions of the Chinese Society of Agricultural Engineering
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Abstract :

China is a major agricultural country, emitting a large amount of corn cob solid waste annually, yet its comprehensive utilization rate is relatively low. Corn cobs have a lower thermal conductivity and can be used as natural insulation materials in concrete blocks. However, due to the porous structure of corn cobs, the compressive strength of corn cob aggregate concrete is relatively low and urgently requires modification. In order to promote the scaled utilization of corn cob and use them to improve the properties of concrete blocks, this study explored the effects of three different modification techniques, such as epoxy resin modification, the modification methods of ceramide and coating, on the chemical bond and molecular structure of hydration products, microstructure of interfacial transition zone, compressive strength and thermal conductivity of corn cob aggregate concrete by infrared spectroscopy, Raman spectroscopy, and scanning electron microscopy. The results showed that compared with epoxy resin modification, the modification methods of ceramide and coating not only increased the content of calcium silicate hydrate gel in the interfacial transition zone of corn cob aggregate concrete, but also reduced the thickness of interfacial transition zone, optimized its microstructure, improved the compressive strength, and reduced the thermal conductivity of concrete blocks. Among them, the effect of ceramide modification method is particularly significant. The order of characteristic peak of calcium silicate hydrate gel in the interface transition zone was the modification methods of ceramide, the modification methods of coating, epoxy resin modification. After ceramide modification, coating modification, and epoxy resin modification, the thickness of the interfacial transition zones of the corn cob aggregate concrete were no distinct interfacial transition zone, between 55~ 66 μm, and between 93~ 101 μm, respectively. Compared with concrete with original corn cob aggregate, the thermal conductivity and compressive strength of concrete with 30% ceramide method modificated corn cob aggregate decreased by 51.5% and 32.2%, respectively. When the proportion of modified corn cob aggregate did not exceed 15%, the concrete blocks met the national standards MU20~MU30 for compressive strength. To improve the overall performance of corn cob aggregate concrete blocks, it is recommended to incorporate no more than 15% of corn cob aggregate with ceramide modification method. This research provides a theoretical basis for the large-scale utilization of corn cobs in concrete blocks, and provides a reference for the further improvement of the relevant properties of concrete blocks. © 2024 Chinese Society of Agricultural Engineering. All rights reserved.

Keyword :

Calcium silicate Calcium silicate Chemical modification Chemical modification Coatings Coatings Compressive strength Compressive strength Concrete aggregates Concrete aggregates Epoxy resins Epoxy resins Hydrates Hydrates Hydration Hydration Infrared spectroscopy Infrared spectroscopy Light weight concrete Light weight concrete Microstructure Microstructure Scanning electron microscopy Scanning electron microscopy Silicate minerals Silicate minerals Thermal conductivity Thermal conductivity Thermal insulation Thermal insulation

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GB/T 7714 Fan, Wei , Liu, Guochao , Chen, Longhui et al. Improving the properties of corn cob aggregate concrete by utilizing different chemical modification methods [J]. | Transactions of the Chinese Society of Agricultural Engineering , 2024 , 40 (11) : 220-226 .
MLA Fan, Wei et al. "Improving the properties of corn cob aggregate concrete by utilizing different chemical modification methods" . | Transactions of the Chinese Society of Agricultural Engineering 40 . 11 (2024) : 220-226 .
APA Fan, Wei , Liu, Guochao , Chen, Longhui , Wang, Dehui . Improving the properties of corn cob aggregate concrete by utilizing different chemical modification methods . | Transactions of the Chinese Society of Agricultural Engineering , 2024 , 40 (11) , 220-226 .
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Improving the properties of corn cob aggregate concrete by utilizing different chemical modification methods; [不同化学改性方法提高玉米芯骨料混凝土的性能] Scopus CSCD PKU
期刊论文 | 2024 , 40 (11) , 220-226 | Transactions of the Chinese Society of Agricultural Engineering
Effects of seawater concentration on the drying shrinkage of seawater concrete SCIE
期刊论文 | 2024 , 457 | CONSTRUCTION AND BUILDING MATERIALS
Abstract&Keyword Cite Version(2)

Abstract :

To address the problem of scarce freshwater in marine engineering construction, seawater is used as a substitute for freshwater in concrete, offering both environmental and economic advantages. Simulated seawater of varying concentrations was designed to assess its effect on seawater concrete's drying shrinkage, with corresponding concrete samples prepared. Drying shrinkage and mass loss measurements were taken for seawater concrete (SWC) at various ages. According to the results of Thermogravimetric Analysis (TGA), X-ray Diffraction (XRD), Mercury Intrusion Porosimetry (MIP) and Scanning Electronic Microscopy (SEM), the effects of different seawater concentration on the phase and content of hydration products, pore structure and micromorphology of SWC were analyzed. The results reveal consistently higher drying shrinkage and mass loss in SWC than in ordinary concrete (OC). An increase in seawater concentration is found to enhance the formation of hydration products, leading to a refinement in the pore structure of the concrete. The shrinkage is positively correlated with the abundance of pores smaller than 100 nm and is also dynamically influenced by the variety and proportion of hydration products. A modified model derived from the GL2000 and factoring in seawater concentration, has been introduced to forecast the drying shrinkage in SWC. The insights garnered from this research provide a foundational theoretical groundwork for the construction of marine infrastructure in diverse geographical settings.

Keyword :

Drying shrinkage Drying shrinkage Hydration products Hydration products Mass loss Mass loss Pore structure Pore structure Seawater concentration Seawater concentration Seawater concrete Seawater concrete

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GB/T 7714 Wang, Xiaomin , Wu, Haodong , Chen, Rong et al. Effects of seawater concentration on the drying shrinkage of seawater concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 457 .
MLA Wang, Xiaomin et al. "Effects of seawater concentration on the drying shrinkage of seawater concrete" . | CONSTRUCTION AND BUILDING MATERIALS 457 (2024) .
APA Wang, Xiaomin , Wu, Haodong , Chen, Rong , Wang, Ming , Chen, Ran , Weng, Lincheng et al. Effects of seawater concentration on the drying shrinkage of seawater concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 457 .
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Effects of seawater concentration on the drying shrinkage of seawater concrete Scopus
期刊论文 | 2024 , 457 | Construction and Building Materials
Effects of seawater concentration on the drying shrinkage of seawater concrete EI
期刊论文 | 2024 , 457 | Construction and Building Materials
Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete SCIE
期刊论文 | 2024 , 427 | CONSTRUCTION AND BUILDING MATERIALS
Abstract&Keyword Cite Version(2)

Abstract :

The application of seawater and sea sand concrete (SWSSC) is beneficial for marine engineering, but the impact of aggregate gradation on its alkali-silica reaction (ASR) remains poorly understood. This study aims to bridge this gap by analyzing ASR products, pore characteristics and expansion rate of specimens. The test results reveal that ordinary concrete (OC) exhibits an inhibitory effect on ASR in comparison with to SWSSC. The 14-day expansion of ordinary concrete and SWSSC with the same aggregate gradation are 0.130 % and 0.212 %, showing potential and high risk of ASR, respectively. Moreover, particle size and gradation of aggregate are the key factors influencing the ASR degree of SWSSC. Compared with coarser aggregate, specimens with finer aggregate consume more K+ and Ca2+ ions, generate more ASR-P1, form less porosity, and produce a larger expansion. Additionally, specimens with gap-graded aggregates, as opposed to those with uniform or continuous gradation, show greater consumption of K+ and Ca2+ ions, increased ASR-P1 formation, more harmful pore formation, and a larger expansion. These results offer insights into optimizing aggregate gradation to reduce ASR in SWSSC and improve its durability.

Keyword :

Aggregate gradation Aggregate gradation Alkali-silica reaction Alkali-silica reaction ASR-P1 ASR-P1 Na-shlykovite Na-shlykovite Seawater and sea sand concrete Seawater and sea sand concrete

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GB/T 7714 Wu, Wenda , Kang, Sixiang , Gong, Qingnan et al. Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 427 .
MLA Wu, Wenda et al. "Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete" . | CONSTRUCTION AND BUILDING MATERIALS 427 (2024) .
APA Wu, Wenda , Kang, Sixiang , Gong, Qingnan , Yao, Hongyu , Zhang, Kaijian , Yang, Hongfei et al. Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 427 .
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Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete EI
期刊论文 | 2024 , 427 | Construction and Building Materials
Influences of aggregate gradation on alkali-silica reaction of seawater and sea sand concrete Scopus
期刊论文 | 2024 , 427 | Construction and Building Materials
Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder SCIE
期刊论文 | 2024 , 39 (6) , 1474-1483 | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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Abstract :

To investigate the impact of limestone powder on the chloride ion concentration coefficient of cement pastes, various techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and mercury-porosimetry (MIP) were employed in this paper. The findings demonstrate that the creation of Friedel's salt is inversely associated with the addition of limestone powder, that is, Friedel's salt production is lessened by adding more limestone powder, however, the coefficient of chloride ion concentration initially decreased and then increased again, as does the porosity, and most likely the pore size as well. The specific surface area of limestone powder has increased, and the content of Friedel's salt increased first and then decreased. However, the shifting trend of Friedel's salt and chloride ion concentration coefficient is in direct opposition, and the pore structure was therefore significantly enhanced. The results of this study offer robust theoretical backing for the inclusion of limestone powder in concrete and provide a positive assessment of its potential applications.

Keyword :

chloride ion concentration coefficient chloride ion concentration coefficient content content friedel's salt friedel's salt limestone powder limestone powder specific surface area specific surface area

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GB/T 7714 Zhang, Kaijian , Huang, Zeping , Jia, Xuxiu et al. Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder [J]. | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION , 2024 , 39 (6) : 1474-1483 .
MLA Zhang, Kaijian et al. "Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder" . | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION 39 . 6 (2024) : 1474-1483 .
APA Zhang, Kaijian , Huang, Zeping , Jia, Xuxiu , Wang, Dehui . Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder . | JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION , 2024 , 39 (6) , 1474-1483 .
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Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder EI
期刊论文 | 2024 , 39 (6) , 1474-1483 | Journal Wuhan University of Technology, Materials Science Edition
Experimental Study on the Chloride Ion Concentration of Cement Pastes Prepared with Limestone Powder Scopus
期刊论文 | 2024 , 39 (6) , 1474-1483 | Journal Wuhan University of Technology, Materials Science Edition
Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete SCIE
期刊论文 | 2024 , 418 | CONSTRUCTION AND BUILDING MATERIALS
WoS CC Cited Count: 2
Abstract&Keyword Cite Version(2)

Abstract :

Economic and environmentally friendly polypropylene (PP) fibre and polyvinyl alcohol (PVA) fibre were found to be beneficial to the strength of recycled coarse aggregate concrete (RCAC), but the effects in the fracture properties of the RCAC has been overlooked. This study added PP fibre and PVA fibre to enhance the ability of the RCAC to resist crack instability expansion. The three-point bending tests were performed to compare the fracture properties of the RCAC with fibres and without fibre. The reinforcement mechanism of fibres was analyzed by the single-fibre pullout tests and scanning electron microscopy tests. The experimental results indicated that fibres could not effectively increase the compressive strength of RCAC but the splitting tensile strength of RCAC was significantly improved with the increase of the volume fraction of fibres and the optimal volume fraction of fibre was 1.5% PP fibre. The PP fibre and PVA fibre both effectively improved the fracture properties of RCAC but acted in the post-cracking stage and the linear loading stage, respectively. As a concrete manifestation of the PP fibre was more effective in increasing the peak load, unstable toughness, and fracture energy of RCAC than the PVA fibre while the PVA fibre was more effective in increasing the initial cracking load and the initial toughness. The 1.0% PP fibre had the best effect on the fracture properties, which increased peak load, unstable toughness, and fracture energy by 47.2%, 42.3%, and 5500%, respectively. The 0.2% PVA has the best effect on the fracture properties of RCAC at the stage before the cracks developed which increased initial cracking load and initial toughness by 25.2% and 43.7%, respectively. In addition, the development of cracks of RCAC with PP fibre was more tortuous than that of RCAC with PVA fibre. A reinforcement mechanism analysis showed that there were obvious diamond-shaped depressions on the surface of PP fibre which provided mechanical interlock to enhance the RCAC. The hydrogen bonds of PVA fibre also enhanced the RCAC through the hydration products attached to the surface of the PVA but it is weaker than diamond-shaped depressions. These results provided theoretical and experimental support for the research gap of PP fibre and PVA fibre in RCAC.

Keyword :

Crack propagation Crack propagation Fracture energy Fracture energy Fracture toughness Fracture toughness Mechanism analysis Mechanism analysis Polypropylene fibre Polypropylene fibre Polyvinyl alcohol fibre Polyvinyl alcohol fibre Recycled coarse aggregate concrete Recycled coarse aggregate concrete

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GB/T 7714 Lin, Qian , Luo, Surong , Lin, Kaida et al. Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 418 .
MLA Lin, Qian et al. "Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete" . | CONSTRUCTION AND BUILDING MATERIALS 418 (2024) .
APA Lin, Qian , Luo, Surong , Lin, Kaida , Wang, Dehui . Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 418 .
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Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete EI
期刊论文 | 2024 , 418 | Construction and Building Materials
Effects of synthetic fibres on the fracture behaviours of recycled coarse aggregate concrete Scopus
期刊论文 | 2024 , 418 | Construction and Building Materials
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