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学者姓名：张凯建
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Abstract ：
In this paper, the effects of river sand, sea-sand, recycled sand, and shell sand on the carbonation performance of recycled aggregate concrete (RAC) were studied. The results showed that the carbonation depth of RAC prepared from sea-sand was 89.8-96.8 %, 83.8-93.4 %, and 70.5-84.8 % of that prepared from recycled sand, shell sand, and river sand, respectively. The compressive strength of RAC made from sea-sand was the highest, followed by RAC made from river sand, shell sand, and recycled sand. The chloride ions in the sea-sand promoted the formation of Friedel's salt and C-S-H with a high Ca/Si ratio, increasing the density of the concrete, thereby blocking the CO2 diffusion channel and reducing the carbonation rate. On the other hand, the weak strength and bond of shell sand, and the weak interfacial transition zone of recycled sand resulted in weak concrete microstructure. In this paper, after 90 days of carbonation, the increment of CaCO3 for preparing RAC from sea-sand was 95.1 %, 67.7 %, and 37.7 % of that of river sand, shell sand, and recycled sand, respectively. The RAC made of shell sand or recycled sand had a porous microstructure, which provided sufficient growth space for CaCO3, and its total porosity was significantly reduced after carbonation. Finally, a prediction model of RAC's carbonation depth was proposed, which was highly consistent with the experimental results. The mean error of the model was close to 1.0 and the COV was 0.169.
Keyword ：
Carbonation depth Carbonation depth Carbonation properties Carbonation properties Fine aggregates Fine aggregates Prediction model Prediction model Recycled aggregate concrete (RAC) Recycled aggregate concrete (RAC)
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| GB/T 7714 | Zhang, Kaijian , Wang, Lin , Li, Ziying et al. Effects of different fine aggregates as sand replacements on the carbonation properties of recycled aggregate concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 468 . |
| MLA | Zhang, Kaijian et al. "Effects of different fine aggregates as sand replacements on the carbonation properties of recycled aggregate concrete" . | CONSTRUCTION AND BUILDING MATERIALS 468 (2025) . |
| APA | Zhang, Kaijian , Wang, Lin , Li, Ziying , Zhang, Qingtian . Effects of different fine aggregates as sand replacements on the carbonation properties of recycled aggregate concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 468 . |
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The layer-by-layer stacking process of 3D Printing Construction Technology (3DPCT) inevitably leads to weak bonding areas between the interlayer interfaces and the interstrip interfaces, which affect the mechanical properties of the printed structure. The effects of different carbonation time of recycled sand on the mechanical properties and interfacial bonding performance of 3D printed cement-based material with a 100 % replacement rate of carbonated recycled sand (3DPCRS) were explored. Although, the carbonation time of recycled sand affected the mechanical anisotropy of the printed specimens, the carbonation treatment of recycled sand cannot eliminate the mechanical anisotropy of 3D printed specimens. With the extension of the carbonation time of recycled sand, the interfacial bonding performance was gradually improved. At 28 days, the interlayer shear strength and interstrip shear strength of T7 group increased by 21.5 % and 18.7 %, respectively. After the carbonation of recycled sand, the indentation modulus of the interlayer interface was increased with the decrease of interface width and porosity, which improved the pore structure and the mechanical properties of the printed specimens.
Keyword ：
3D Printing Construction Technology 3D Printing Construction Technology Carbonation time Carbonation time Interfacial bonding performance Interfacial bonding performance Microstructural properties Microstructural properties Recycled sand Recycled sand
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| GB/T 7714 | Luo, Surong , Li, Wenqiang , Cai, Yili et al. Effects of carbonated recycled sand on the interfacial bonding performance of 3D printed cement-based material [J]. | JOURNAL OF BUILDING ENGINEERING , 2025 , 99 . |
| MLA | Luo, Surong et al. "Effects of carbonated recycled sand on the interfacial bonding performance of 3D printed cement-based material" . | JOURNAL OF BUILDING ENGINEERING 99 (2025) . |
| APA | Luo, Surong , Li, Wenqiang , Cai, Yili , Zhang, Kaijian . Effects of carbonated recycled sand on the interfacial bonding performance of 3D printed cement-based material . | JOURNAL OF BUILDING ENGINEERING , 2025 , 99 . |
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This study utilizes recycled sand and shell sand to replace sea-sand in seawater sea-sand recycled aggregate concrete (SSRAC) and explores their dynamic compressive properties. A total of 28 sets of specimens were designed, and their stress-strain curves under different strain rates were analyzed. The findings indicated that the dynamic increasing factor (DIF) of peak stress in SSRAC reached its peak at a 50% replacement ratio of recycled sand, exhibiting a 3.9% to 7.7% increase compared to a 0% replacement ratio. Conversely, there was an overall decreasing trend in the DIF when the replacement ratio of shell sand increased. Using recycled sand resulted in an average reduction of approximately 45% in the elastic modulus of the interfacial transition zone (ITZ), while the introduction of shell sand slightly increased that of it. Finally, considering strain rate effects, a dynamic compressive prediction model for SSRAC with different types of fine aggregates was established.
Keyword ：
dynamic compressive properties dynamic compressive properties recycled sand recycled sand Seawater sea-sand recycled aggregate concrete (SSRAC) Seawater sea-sand recycled aggregate concrete (SSRAC) shell sand shell sand strain rates strain rates
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| GB/T 7714 | Zhang, Qingtian , Ou, Junrui , Lan, Qibin et al. Effects of recycled sand and shell sand as sand replacement on the dynamic properties of seawater sea-sand recycled aggregate concrete [J]. | JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS , 2024 , 13 (11) : 1707-1723 . |
| MLA | Zhang, Qingtian et al. "Effects of recycled sand and shell sand as sand replacement on the dynamic properties of seawater sea-sand recycled aggregate concrete" . | JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS 13 . 11 (2024) : 1707-1723 . |
| APA | Zhang, Qingtian , Ou, Junrui , Lan, Qibin , Zhang, Kaijian . Effects of recycled sand and shell sand as sand replacement on the dynamic properties of seawater sea-sand recycled aggregate concrete . | JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS , 2024 , 13 (11) , 1707-1723 . |
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To solve the problem of the lack of structural design basis of fiber reinforced recycled aggregate concrete (FRAC), and promote its realistic application, in this investigation, the replacement ratio of recycled coarse aggregate (RCA), fiber type, fiber content, and fiber blending forms are taken as experimental variables. With the size of Phi 100 mmx300 mm, 21 groups of cylindrical specimens are designed to study the influence of the above variables on the complete stress-strain curve of fiber RAC when bearing uniaxial tension. The results show that the tensile characteristic values decrease as the replacement ratio of RCA increases. When single doping of fibers was considered, the tensile characteristic values increased as fiber content increased. When the steel (SF) was mixed with polyvinyl alcohol fiber (PVAF) and polypropylene fiber (PPF), the tensile characteristic values were improved. Proper blending of PVAF and PPF can improve the characteristic values of tensile ductility. Through the results of the uniaxial tensile experiment, constitutive equations of the uniaxial tensile stress-strain curve of FRAC under different test variables were established, which can provide fundamental material parameters to design FRAC structures.
Keyword ：
Constitutive relationship Constitutive relationship Fiber Fiber Recycled aggregate concrete (RAC) Recycled aggregate concrete (RAC) Uniaxial tensile stress-strain curve Uniaxial tensile stress-strain curve
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| GB/T 7714 | Luo, Surong , Zhou, Wentao , Yu, Minming et al. Stress-strain relationship of fiber reinforced recycled aggregate concrete under uniaxial tension [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 422 . |
| MLA | Luo, Surong et al. "Stress-strain relationship of fiber reinforced recycled aggregate concrete under uniaxial tension" . | CONSTRUCTION AND BUILDING MATERIALS 422 (2024) . |
| APA | Luo, Surong , Zhou, Wentao , Yu, Minming , Zhang, Kaijian , Zhang, Qingtian . Stress-strain relationship of fiber reinforced recycled aggregate concrete under uniaxial tension . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 422 . |
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The stress-strain relationship of recycled coarse aggregate concrete is the bridge to realize its mechanical analysis from material level to structural level, and becomes the cornerstone of the basic theory of recycled coarse aggregate concrete structure. The research progress made by the author's group in the stress-strain relationship of recycled coarse aggregate concrete over the years was introduced. The influence of complex interfacial transition zones on the failure behavior of recycled coarse aggregate concrete was investigated by using the method of modeling recycled coarse aggregate, and the microscopic damage and evolutionary mechanism of recycled coarse aggregate concrete were revealed. From static to dynamic loading, the experimental studies of stress-strain behaviors of recycled coarse aggregate concrete were carried out systematically under different working conditions, the influence of loading conditions on the internal stress and deformation of recycled coarse aggregate concrete was investigated, and the corresponding mechanical and mathematical models were established. Furthermore, considering the temporal and spatial variability of the performance of recycled coarse aggregates, the probabilistic distribution characteristics of the mechanical response of recycled coarse aggregate concrete were found, and the stochastic damage constitutive relationship of recycled coarse aggregate concrete was proposed. Based on the obtained constitutive model, the time-dependent reliability analysis and dynamic nonlinear analysis of recycled coarse aggregate concrete components and structures were carried out, providing theoretical support for the safe application of recycled coarse aggregate concrete in practical engineering. Relevant conclusions were extracted and future research work was prospected. © 2024 Tsinghua University. All rights reserved.
Keyword ：
Concrete aggregates Concrete aggregates Dynamic loads Dynamic loads Dynamics Dynamics Nonlinear analysis Nonlinear analysis Probability distributions Probability distributions Recycling Recycling Reliability analysis Reliability analysis Stochastic systems Stochastic systems Stress-strain curves Stress-strain curves
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| GB/T 7714 | Xiao, Jian-Zhuang , Tang, Yu-Xiang , Zhang, Kai-Jian et al. STRESS-STRAIN RELATIONSHIP OF RECYCLED COARSE AGGREGATE CONCRETE [C] . 2024 : 43-55 . |
| MLA | Xiao, Jian-Zhuang et al. "STRESS-STRAIN RELATIONSHIP OF RECYCLED COARSE AGGREGATE CONCRETE" . (2024) : 43-55 . |
| APA | Xiao, Jian-Zhuang , Tang, Yu-Xiang , Zhang, Kai-Jian , Yang, Hai-Feng . STRESS-STRAIN RELATIONSHIP OF RECYCLED COARSE AGGREGATE CONCRETE . (2024) : 43-55 . |
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考虑贝壳含量、龄期等因素,对不同加载应变率下的海水海砂再生混凝土(SSRAC)试件开展了单轴受压应力-应变曲线试验.结果表明:600 d时,与普通混凝土(NAC)相比,SSRAC峰值应力和峰值应变分别提高了10.4%、23.2%,弹性模量降低了29.1%;当掺入贝壳颗粒后,SSRAC应变率敏感性增加;结合试验以及文献数据,基于GB50010模型,考虑不同应变率下特征参数的动态增大系数,提出了适用于中低应变率(10-5～10-1 s-1)下SSRAC受压动力本构模型,并对其曲线特征进行了机理解释.
Keyword ：
再生混凝土 再生混凝土 动态增大系数 动态增大系数 单轴受压应力-应变曲线 单轴受压应力-应变曲线 应变率 应变率 海水海砂 海水海砂
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| GB/T 7714 | 张青天 , 张凯建 . 海水海砂再生混凝土受压动力本构模型 [J]. | 建筑材料学报 , 2024 , 27 (7) : 580-588,610 . |
| MLA | 张青天 et al. "海水海砂再生混凝土受压动力本构模型" . | 建筑材料学报 27 . 7 (2024) : 580-588,610 . |
| APA | 张青天 , 张凯建 . 海水海砂再生混凝土受压动力本构模型 . | 建筑材料学报 , 2024 , 27 (7) , 580-588,610 . |
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The application of fiber reinforced polymer(FRP)in seawater sea-sand concrete(SSC)can avoid the corrosin of steel bars induced by the chloride ion, but FRP reinforced seawater sea-sand concrete(FRP-SSC)structures still have durability issues in harsh environments, which is one of the hot and difficult issues of current research. Based on the existing literature, the durability of FRP bars, SSC and FRP-SSC components in marine environments was sorted out. The results show that under the combined effect of the alkaline environment of concrete and salt ions in seawater and sea-sand, the degradation and variability of mechanical properties of FRP bars increase, and the bonding strength of FRP bars and SSC decreases. The addition of salt ions in seawater and sea-sand accelerates the hydration reaction, thus improving the compactness and durability of SSC. The effect of marine environment leads to the deterioration of the mechanical properties of FRP and the reduction of bonding strength between FRP/steel-FRP composite bars(SFCB)and SSC, which weakens the bearing capacity of SSC components and changes the failure mode of SSC components. The bearing capacity of SSC components decrease with the increase of recycled coarse aggregate(RCA)replacement rate. It is suggested that the quantification of variability of mechanical property of FRP bars and SSC, and the time-dependent reliability-based design methods of components should be taken as the direction of further research in the future. © 2024, Editorial Department of Journal of Architecture and Civil Engineering. All rights reserved.
Keyword ：
durability durability FRP bar FRP bar seawater sea-sand concrete seawater sea-sand concrete steel-FRP composite bar steel-FRP composite bar transformation of failure mode transformation of failure mode
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| GB/T 7714 | Zhang, K. , Wang, L. . Review on durability of FRP bar reinforced seawater sea-sand concrete materials and components [J]. | Journal of Architecture and Civil Engineering , 2024 , 41 (2) : 17-30 . |
| MLA | Zhang, K. et al. "Review on durability of FRP bar reinforced seawater sea-sand concrete materials and components" . | Journal of Architecture and Civil Engineering 41 . 2 (2024) : 17-30 . |
| APA | Zhang, K. , Wang, L. . Review on durability of FRP bar reinforced seawater sea-sand concrete materials and components . | Journal of Architecture and Civil Engineering , 2024 , 41 (2) , 17-30 . |
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To explore the flexural fatigue performance of steel fibers reinforced recycled aggregate concrete (SF-RAC), the flexural fatigue test and residual strength test with different stress levels were conducted. Besides, the fatigue cracks propagation under cyclic loading were observed and analyzed by digital image correlation (DIC) technology. The results show that the flexural fatigue life of SF-RAC increases when the content of steel fibers increases, and it is proved to be well in accordance with the three-parameter Weibull distribution. The flexural fatigue life equation with different stress level and reliability (S-N-P equation) is obtained based on it, which shows that when the fiber volume content is 1.5%, the fatigue strength of SF-RAC is about 37.2% higher than that of RAC without fibers. Then, a fatigue strain-based damage evolution model is established, and the derived residual strength model can well predict the damage degree and residual life of SF-RAC. Moreover, the steel fibers can improve the critical crack propagation length and loading cycles of RAC. The crack propagation rate can be decreased by 97.63% when the fiber volume content is 1.5%, and it is increased with the development of stress level. Finally, the influence mechanism of steel fibers on flexural fatigue performance of RAC were explained through microstructure tests.
Keyword ：
Crack propagation rate Crack propagation rate Digital image correlation (DIC) Digital image correlation (DIC) Flexural fatigue performance Flexural fatigue performance Recycled aggregate concrete (RAC) Recycled aggregate concrete (RAC) Steel fibers Steel fibers Three -parameter Weibull distribution Three -parameter Weibull distribution
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| GB/T 7714 | Luo, Surong , Su, Yongqing , Zhang, Qingtian et al. Effects of steel fibers on the flexural fatigue performance of recycled aggregate concrete [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 412 . |
| MLA | Luo, Surong et al. "Effects of steel fibers on the flexural fatigue performance of recycled aggregate concrete" . | CONSTRUCTION AND BUILDING MATERIALS 412 (2024) . |
| APA | Luo, Surong , Su, Yongqing , Zhang, Qingtian , Zhang, Kaijian . Effects of steel fibers on the flexural fatigue performance of recycled aggregate concrete . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 412 . |
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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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Polypropylene fibers possess high strength and excellent abrasion resistance, and have been used to enhance concrete materials. This study investigated the influence of polypropylene fibers on the dynamic compressive properties of seawater sea-sand recycled aggregate concrete (SSRAC) under three strain rates (10- 5 , 10-4, and 10-3/s). 90 specimens were prepared, with fiber lengths of 9, 13.5, and 18 mm (the corresponding aspect ratio of 357, 536, and 714, respectively), and fiber contents of 0.6, 0.9, and 1.2 kg/m3. The test results indicate that the polypropylene fiber reinforced SSRAC specimens are more sensitive to strain rate in terms of peak stress and peak strain, and the incorporation of fibers generally increases the peak stress. Furthermore, the microscopic morphology and nanoindentation analysis are conducted on the interfacial transition zone (ITZ) of the polypropylene fiber reinforced SSRAC. The addition of polypropylene fibers increases the local porosity of the ITZ, and reduces the bonding area between mortar and aggregates, resulting in a decrease in the elastic modulus of the ITZ. This reduction effect varies with different lengths and contents of fibers, which has a significant impact on the peak stress, peak strain, and elastic modulus of specimens, leading to some degree of dispersion in the corresponding strain effect. Finally, a dynamic prediction model for fiber-reinforced SSRAC is derived, which provides a theoretical basis for the study of the dynamic mechanical properties of fiber reinforced SSRAC.
Keyword ：
Interfacial transition zone (ITZ) Interfacial transition zone (ITZ) Polypropylene fibers Polypropylene fibers Seawater sea-sand recycled aggregate concrete Seawater sea-sand recycled aggregate concrete (SSRAC) (SSRAC) Stress-strain curve Stress-strain curve Uniaxial compression Uniaxial compression
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| GB/T 7714 | Zhang, Kaijian , Lin, Wenqiang , Lan, Qibin et al. Compressive properties of polypropylene fiber reinforced seawater sea-sand recycled aggregate concrete under different strain rate loading [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 452 . |
| MLA | Zhang, Kaijian et al. "Compressive properties of polypropylene fiber reinforced seawater sea-sand recycled aggregate concrete under different strain rate loading" . | CONSTRUCTION AND BUILDING MATERIALS 452 (2024) . |
| APA | Zhang, Kaijian , Lin, Wenqiang , Lan, Qibin , Zhang, Qingtian . Compressive properties of polypropylene fiber reinforced seawater sea-sand recycled aggregate concrete under different strain rate loading . | CONSTRUCTION AND BUILDING MATERIALS , 2024 , 452 . |
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