Article
Construction & Building Technology
Fatemeh Soltanzadeh, Ali Edalat-Behbahani, Eduardo N. B. Pereira
Summary: This research explores promising solutions for increasing the sustainability of concrete structures through the use of basalt fibers reinforced polymer (BFRP) rebars and recycled steel fibers from waste tyres (RTSF) in the reinforced concrete structures. The study analyzes and discusses the influence of different factors on the bond performance between BFRP rebars and RTSF reinforced concrete. The research findings show that using RTSF can increase the bond strength between BFRP rebars and fiber reinforced concrete by 6.3% under static loading and 9.7% under fatigue loading.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Wenjing Wang, Yang Wang, Dongdong Li, Yuanzhen Liu, Zhu Li
Summary: Corrosion of steel bars in concrete structures can be accelerated by internal defects in recycled aggregates used in recycled aggregate concrete (RAC). The use of corrosion-resistant materials as substitutes for steel bars may help solve this problem. Through pull-out tests, this study assessed the bonding properties between Basalt Fiber Reinforced Polymer (BFRP) bars and RAC, considering factors such as RAC strength grade, cover thickness, anchorage length, diameter of bars, and replacement rate of recycled concrete aggregate (RCA). The bond-slip relationship between BFRP bars and RAC was successfully established using the mBPE model with satisfactory accuracy.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Jiaojiao Yuan, Dejian Shen, Zhilan Xu, Ming Li, Chuyuan Wen, Da Zong
Summary: This study investigates the effect of bond lengths on the bond behavior between BFRP sheets and concrete. The results show that the failure load between BFRP sheets and concrete increases with the increase of the bond length when the bond length does not exceed the effective bond length. The effective bond length of the interface between BFRP sheet and concrete is not more than 80 mm obtained from the failure load. Models for the failure load and the effective bond length are established.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Yushuang Lei, Liu Jin, Fengjuan Chen, Wenxuan Yu, Xiuli Du
Summary: This study establishes a numerical model considering strain rate and material interaction to analyze the effect of initial static loading on the dynamic shear performance of BFRP-reinforced concrete deep beams. The results demonstrate that an increase in strain rate and stirrup ratio can improve the shear capacity and deformation capacity of the beams, with strain rate playing a dominant role.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Chemistry, Multidisciplinary
Bo Wen, Guanyi Gao, Ding Huang, Hongyu Zheng
Summary: This study investigated the bonding performance between hybrid basalt-polypropylene fiber-reinforced concrete and deformed bars by combining experiments and theoretical analysis. The results showed that the bonding performance of the hybrid fiber-reinforced concrete was essentially the same as that of the ordinary concrete.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Physical
Julita Krassowska, Carolina Pina Ramirez
Summary: This study investigated the flexural properties of concrete beams reinforced with basalt fiber-reinforced polymer (BFRP) bars and concrete stirrups. The results showed that the use of basalt fiber-reinforced bars increased the curvature ductility of the beams, but also resulted in more cracks and larger crack widths.
Article
Construction & Building Technology
Bo Wang, Gejia Liu, He Miao
Summary: This paper investigates the bond performance between glass-fiber-reinforced polymer (GFRP) bars and concrete, and considers the effects of various factors on the bonding strength. It proposes calculation formulas, predicts the bond strength retention rate, and establishes a bond-slip model in a corrosive environment. The research provides a theoretical basis for future studies on the bond-slip performance of GFRP bars and concrete.
Article
Construction & Building Technology
B. Vijaya Prasad, N. Anand, Balamurali Kanagaraj, Tattukolla Kiran, Eva Lubloy, M. Z. Naser, P. D. Arumairaj, Diana Andrushia
Summary: Fiber-reinforced geopolymer concrete with sustainable properties has attracted global attention. This study investigates the pull-out behavior of fiber-reinforced geopolymer concrete at elevated temperatures. The results show that adding various types of fibers improves the compressive strength and bond strength of the specimens.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Engineering, Civil
Wei Zhang, Zhanzhan Tang
Summary: This study introduces an accurate and efficient numerical approach for predicting the fatigue response of CFRP-strengthened structures, including the debonding process of CFRP plates from concrete surfaces under fatigue loading. The proposed model is more effective in predicting the mechanical response of CFRP-to-concrete interfaces subjected to fatigue loading compared with existing bond-slip models.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Engineering, Civil
Shengjiang Sun, Lili Xing, Peng Gui, Bo Li, Hangyu Li, Lei Zhao, Kuihua Mei
Summary: Steel-basalt fiber composite bars (SBFCBs) possess excellent properties such as strength, modulus, toughness, corrosion resistance, and cost-effectiveness. This study experimentally assessed the bond-slip performance of SBFCBs in concrete through pullout and beam bond tests. The various factors influencing bond performance were analyzed, and the bond mechanism between SBFCBs and concrete was discussed.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2023)
Article
Construction & Building Technology
Amr El-Nemr, Ehab A. Ahmed, Cristina Barris, Panuwat Joyklad, Qudeer Hussain, Brahim Benmokrane
Summary: This study investigates the bond performance of different types of new generation FRP (fiber-reinforced polymer) bars embedded in concrete. A total of 87 pullout specimens were constructed and tested, and the results show that the bond strength of FRP bars generally decreases with increasing bar diameter, while the bar diameter has insignificant impact on steel bars. There is a positive relationship between the concrete compressive strength and the bond strength gained. The test results are also used to assess different analytical models for bond stress-slip relationships.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Composites
Xiaofei Zhang, Xin Wang, Jingyang Zhou, Zhishen Wu
Summary: The bond properties between polymer impregnated basalt textile and fine-grained concrete were investigated. The experimental results showed that bond strength increased with bond length and was highest for epoxy resin-impregnated textile. The interfacial friction between textile and concrete was improved by sticking sand or fiber, and the transverse yarn of epoxy resin-impregnated textile increased bond strength through an interlocking effect.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Aidas Jokubaitis, Juozas Valivonis
Summary: This comprehensive analysis examines the relationship between transfer length and slip for different types of prestressed fiber reinforced polymer (FRP) reinforcement. Data from approximately 170 specimens prestressed with different FRP reinforcement were collected to analyze the transfer length and slip. New bond shape factors were proposed for carbon fiber composite cable (CFCC) strands (alpha = 3.5) and carbon fiber reinforced polymer (CFRP) bars (alpha = 2.5) based on a larger database. The type of prestressed reinforcement was also found to influence the transfer length of aramid fiber reinforced polymer (AFRP) bars, leading to the proposal of alpha = 4.0 for AFRP Arapree bars and alpha = 2.1 for AFRP FiBRA and Technora bars. The findings of this study have implications for the production and quality control processes of precast prestressed concrete members and can contribute to further research on the transfer length of FRP reinforcement.
Article
Construction & Building Technology
Jaza Hassan Muhammad, Ali Ramadhan Yousif
Summary: This research investigated the effect of adding basalt macro fibers (BMF) to high-strength concrete (HSC) beams reinforced with basalt fiber-reinforced polymer (BFRP) bars. The results showed that adding BMF improved the shear resistance of the beams, especially for higher flexural reinforcement ratios.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Engineering, Civil
Konstantinos Tsiotsias, S. J. Pantazopoulou
Summary: This study investigates the complex bond interaction between reinforcement and concrete, focusing on the bond strength of bars embedded in high-performance cementitious materials. It is found that the use of fiber reinforcement enhances bond strength significantly, while internal confinement in high-performance concrete contributes to more effective utilization of standard steel reinforcing bars.
ENGINEERING STRUCTURES
(2021)
Article
Chemistry, Physical
Jie Zhu, Dejian Shen, Jingjing Xie, Chunmei Tang, Baosheng Jin, Shengxing Wu
Summary: Quantum chemical calculations were used to investigate the mechanism of urea decomposition catalyzed by Sporosarcina pasteurii urease in Microbial Induced Carbonate Precipitation, revealing the role of different residues in the catalytic process and establishing an active site model. The results provide insights into the step-by-step process of urea decomposition in microbial self-healing concrete.
MOLECULAR SIMULATION
(2021)
Article
Construction & Building Technology
Dejian Shen, Chengcai Li, Ming Li, Ci Liu, Jiacheng Kang
Summary: The study investigated the effect of different dosages of superabsorbent polymers on the correlation between autogenous shrinkage and internal relative humidity of high strength concrete. Experimental results showed that increasing the dosage of SAPs increased the internal relative humidity and decreased the autogenous shrinkage rate of the concrete.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Xin Wang, Dejian Shen, Shengxing Wu
Summary: This study analyzed the influence of particle internal pores (PIPs) on tricalcium silicate (C3S) hydration kinetics and microstructure development. Results showed that considering PIPs in simulation reduced the integral absolute errors for hydration heat, differences in hydration heat between different IPSD categories were small, and particles with more small-sized PIPs showed more isotropic dissolution.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Chemistry, Physical
Jie Zhu, Dejian Shen, Wei Wu, Baosheng Jin, Shengxing Wu
Summary: The study investigated the hydration inhibition mechanism of gypsum on tricalcium aluminate through molecular dynamics simulation and quantum chemical calculation. The results showed different forms of adsorption on the surfaces of gypsum and tricalcium aluminate, with gypsum having a more conducive internal structure for water movement. The diffusibility of tricalcium aluminate was weaker due to its cage-like structure, and its structure was more sensitive to hydrolysis compared to gypsum.
MOLECULAR SIMULATION
(2021)
Article
Chemistry, Analytical
Qun Yang, Dejian Shen
Summary: This study proposes a sequence-to-sequence (Seq2Seq) model to highlight regions of interest and quantify the probability of damage. Test results show that the model has a strong capability of distinguishing damage representations and quantifying the probability of damage.
Article
Construction & Building Technology
Jiacheng Kang, Dejian Shen, Chengcai Li, Ming Li, Xudong Wang, Haijiang Hu
Summary: This study investigates the effect of water-to-cement ratio on internal relative humidity (IRH) and autogenous shrinkage (AS) of internally cured (IC) concrete. It proposes a two-stage prediction model of AS based on IRH results for IC concrete considering the effect of water-to-cement ratio.
The experimental results show that increasing the water-to-cement ratio increases the IRH and critical time of IC concrete, and also increases the expansion peak. However, it decreases AS and AS rate. Compared to ordinary concrete, IC concrete has higher IRH, critical time, and expansion peak, but lower AS and AS rate.
STRUCTURAL CONCRETE
(2022)
Article
Construction & Building Technology
Dejian Shen, Chengcai Li, Jiacheng Kang, Kaiqi Liu, Ci Liu, Ming Li
Summary: This research investigated the tensile creep performance of early age high-strength concrete modified with superabsorbent polymer (SAP). The experimental analyses indicated that the tensile creep properties of the concrete were influenced by the loading age, with a significant aging effect within the first day of loading.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Chemistry, Physical
Jie Zhu, Dejian Shen, Jingjing Xie, Baosheng Jin, Shengxing Wu
Summary: This study investigated the transformation mechanism of NH2COOH elimination and hydrolysis under neutral and basic conditions using quantum chemical calculation. The results showed that NH2COOH tended to carry out elimination reaction catalyzed by NH3 in neutral condition, while it tended to undergo hydrolysis reaction in basic condition.
MOLECULAR SIMULATION
(2022)
Article
Construction & Building Technology
Dejian Shen, Zhizhuo Feng, Tingting Zhang, Xiaojian Tang, Guoqing Jiang
Summary: This study investigates the effects of polyvinyl alcohol (PVA) fibers on the stress relaxation and cracking potential of high-strength concrete (HSC). The experimental results show that the incorporation of PVA fibers can reduce the free and restrained shrinkage of concrete, thereby lowering the cracking potential of HSC.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Chuyuan Wen, Dejian Shen, Zhizhuo Feng, Ci Liu, Shucheng Deng
Summary: Internal curing (IC) agents, such as prewetted lightweight aggregates (LWAs), have been proven to reduce autogenous shrinkage and early-age cracking of concrete. This study investigates the internal relative humidity (IRH), autogenous shrinkage, and their correlation in early-age concrete with different LWAs replacement ratios. The results show that increasing the proportion of prewetted LWAs leads to increased maximum expansion and decreased autogenous shrinkage. A prediction model for evaluating autogenous shrinkage considering IC water introduced by LWAs replacement ratios is proposed.
STRUCTURAL CONCRETE
(2023)
Article
Engineering, Civil
Dejian Shen, Ming Li, Qun Yang, Chuyuan Wen, Ci Liu, Jiacheng Kang, Xuyang Cao
Summary: This research experimentally studied the effects of different earthquake damages on the seismic performance of retrofitted aged RC beam-column joints with BFRP sheets. Results showed that retrofitting with BFRP sheets effectively improved the seismic performance of earthquake-damaged corroded specimens, with the effectiveness of retrofitting being significantly influenced by the levels of earthquake damages. The retrofitting delayed the bucking of stirrups, spalling and crushing of concrete, and increased the ductility of corroded and uncorroded specimens under earthquake damages. The retrofitted specimens exhibited a considerable improvement in total cumulative energy dissipation and final stiffness, with a maximum increase of 22.3% and 14.3% compared to the benchmark specimen, respectively. Moreover, models were proposed to predict the shear strength of RC beam-column joint cores considering the influences of earthquake damage, reinforcement corrosion, and FRP retrofitting.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2022)
Article
Construction & Building Technology
Zhizhuo Feng, Dejian Shen, Jingbin Zhang, Hui Tang, Guoqing Jiang
Summary: This paper investigates the mechanical properties, restrained shrinkage, and cracking potential of high-strength concrete (HSC) with Xypex crystalline admixture (CA). The results show that the addition of CA improves the compressive and splitting tensile strength of the concrete, but also leads to increased restrained shrinkage and cracking potential.
STRUCTURAL CONCRETE
(2023)
Article
Construction & Building Technology
Zhizhuo Feng, Dejian Shen, Shiqian Xu, Haoze Shao, Guoqing Jiang
Summary: The development of nanotechnology has allowed for the use of various nanomaterials in concrete. However, there has been limited research on the early-age properties and cracking potential of concrete with nanomaterials. This study aimed to address this limitation by conducting an experiment on high-strength concrete with nano-CaCO3. The results showed improved mechanical properties and reduced shrinkage when 1% NC was incorporated into the concrete.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Ci Liu, Dejian Shen, Ming Li, Chengcai Li, Jiacheng Kang, Mingliang Wang
Summary: This study investigated the changes in internal relative humidity (IRH) and distribution of IRH in SAP-modified concrete under sealed conditions and exposed to various ambient humidities. The use of SAPs and additional internal curing water can compensate for water consumption caused by self-desiccation and moisture diffusion, increasing the IRH of concrete exposed to different ambient humidities. However, the effectiveness of SAPs in mitigating the drop in IRH decreased with increasing ambient humidity. A model for predicting IRH of SAP-modified concrete exposed to various ambient humidities was proposed, considering the influence of self-desiccation and moisture diffusion.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Jingbin Zhang, Guoxuan Han, Dejian Shen, Xuehui An, Serges Mendomo Meye
Summary: The study aims to examine the impact of powdery industrial solid wastes on the optimal proportion of pastes and self-compacting concrete (SCC). Nine groups of powdery industrial solid wastes, including cement, fly ash (FA), limestone powder (LP), granulated blast furnace slag (GBFS), and modified phosphogypsum (MPG), were designed. The properties of the powder materials, such as zeta potential, density, and specific surface area, were taken into account. A model was proposed to assess the effect of powder properties on the optimal mix proportion, and a linear regression method was used to establish quantitative relationships. A new powder combination was designed, and the optimal water-to-powder ratio (VW/VP) and the dosage of superplasticizer by mass (SP%) can be calculated based on the physical and chemical properties of the powder combination. The effectiveness of the powder effect model was validated by narrowing the search area and obtaining the SCP zone where good SCC was achieved.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
