Article
Construction & Building Technology
Jun Zhang, Zihao Yu, Yuxiang Tang, Jie Shen, Hongniao Chen
Summary: This study investigated the fracture properties of concrete under cyclic loading through three-point bending tests and ESPI technique. The experimental results showed that the load-displacement curves can be divided into five stages, with CMODc increasing with loading cycles while CTODc remains constant. The cumulative dissipative energy can be used as a fracture parameter.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xiaochen Zhang, Ya Lu, Xiangguo Wu, Puyan Wang, Ran Li, Yang Liu, Chao Shen, Heming Zhang, Dong Zhang
Summary: The size effect of specimen thickness on the mechanical properties of UHPC was investigated through cyclic compression tests. UHPC prisms with thicknesses ranging from 20 mm to 100 mm were tested and a constitutive model accounting for the thickness was proposed. It was found that different thicknesses of UHPC specimens exhibited the same diagonal shear failure mode. The compressive strength was significantly influenced by the thickness, while the peak strain and elastic modulus showed negligible size effects. Damage in the unloading and reloading modulus at zero stress occurred only when the unloading strain exceeded 0.8 times the peak strain. The proposed constitutive model accurately predicted the stress-strain response of UHPC with different thicknesses under cyclic compressive loading.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Hongniao Chen, Dengkai Liu
Summary: This study investigated the fracture and damage characteristics of high-strength concrete using cyclic loading and digital image correlation technique. The experimental results showed that the bearing capacity, deformation performance, and fracture energy of HSC were not affected by the loading and unloading process. Under cyclic loading, the residual crack mouth opening increased as the crack mouth opening displacement increased, while the load degradation rate decreased.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yunteng Huang, Jun Wang, Mengjie Ying, Junfeng Ni, Mingfeng Li
Summary: The particle-size gradation significantly affects the cyclic shear behavior of recycled concrete aggregate (RCA). Well-graded RCA exhibits higher shear strength, vertical displacement, stiffness, and damping compared to poorly-graded and discontinuously-graded RCA. Further, post-cyclic shear tests show enhanced shear strength in RCA, with well-graded RCA demonstrating superior friction characteristics.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Jixing Cao, Haibei Xiong, Jiawei Chen
Summary: This study investigates the mechanical characteristics and hysteretic behavior of TCC bolted connections. It was found that steel pads can effectively improve the load-carrying capacity and energy-dissipating capacity of the connections.
Article
Chemistry, Analytical
David Vokoun, Sneha Samal, Ivo Stachiv
Summary: Nafion is a highly suitable material for various applications due to its high ion-conductivity, hydrophilicity, and thermal and chemical stability. However, the mechanical properties of Nafion membrane, which are influenced by its viscoplastic characteristics, have a significant impact on the performance of Nafion-based sensors. This study investigates the mechanical properties of Nafion under cyclic loading and reveals a time-dependent recovery process that is strain-rate dependent. The weakening of the recovery behavior after multiple stress-strain cycles can be important for the future design of chemical and biological microsensors and nanosensors.
Article
Materials Science, Multidisciplinary
Weipei Xue, Hanwen Zhang, Haopeng Li, Wei Xu
Summary: The study found that early loading leads to severe damage to the concrete structure and significant increase in internal pores, resulting in deteriorated mechanical and permeability properties. The earlier the loading, the greater the deterioration. In contrast, loading at a low level has a minor impact on the internal structure of concrete.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Zhi Liu, Li Zhang, Lanhao Zhao, Zihan Wu, Bowen Guo
Summary: A novel damage model for concrete has been developed, which can accurately reflect the complex hysteresis phenomena and nonlinear behaviors of concrete under cyclic loading. The model transforms the complex stress state into a uniaxial state using equivalent strain, with simple mathematical expression and few computational parameters. Meanwhile, unloading and reloading paths that can reflect the hysteresis effect are established. The proposed model is concise, easy to implement, and shows strong generality.
Article
Engineering, Geological
Kui Zhao, Lin Zhang, Daoxue Yang, Jiefang Jin, Peng Zeng, Xing Wang, Shanhu Ran, Dongming Deng
Summary: This study investigates the mechanical behavior and Kaiser effect of rock samples under cyclic impact loading damage and water saturation through a series of tests. The results show that the cyclic loading and unloading strength of rock samples in saturated condition decreases compared to those not subjected to cyclic impact loading. The water-rock interaction plays a crucial role in this phenomenon. The study suggests that drilling of cores from stress-disturbed areas should be avoided during in situ stress measurement.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Mechanics
Klajdi Toska, Flora Faleschini
Summary: This study analyzed the experimental behavior of confined concrete specimens subjected to axial cyclic load, revealing that the stress-strain curves obtained with cyclic loading coincide with the monotonic curve. The stress-strain curve of FRCM-confined concrete has been modeled according to three different behaviors exhibited in this experimental campaign, including purely softening, softening with plateau, and hardening.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
S. Bright Singh, M. Murugan
Summary: This study investigated the impact of metakaolin as partial replacement for cement in pervious concrete and found that the inclusion of metakaolin at an optimum level can improve the performance of pervious mixes.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Fei-yu Liu, Hao-ze Li, Hong-lei Sun
Summary: The mechanical properties of rubber-sand mixtures are influenced by the ratio of rubber-sand particle sizes and the rubber content. Research has shown that rubber-sand mixtures with low rubber content and a large particle size ratio have a positive effect on the shear strength of the mixed soil.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Geological
Xiaoxi Rui, Yang Shen, Yinghao Ma, Junhong Xu
Summary: This study conducted experiments on calcareous sand, which is essential for building airports in the South China Sea, and found that frequency has a significant impact on the dynamic properties of calcareous sand. Previous studies have shown contradictory results, and this paper summarizes the potential reasons for these conflicting conclusions. Through a series of experiments, the mechanical behavior of three types of samples under different frequencies was analyzed. Resilient porewater pressure was found to be a more accurate parameter to describe the sample stability compared to other commonly used parameters, and it was found to be related to the particle morphology of the calcareous sand. The results indicate that higher frequency stabilizes the samples' mechanical properties.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Mechanics
Liu Jin, Jian Li, Wenxuan Yu, Xiuli Du
Summary: The study investigated the influence of lateral stress ratio on the mechanical properties of concrete specimens under different loading conditions. It was found that the spindle compressive strength and lateral tensile strength exhibited different trends with the increase of lateral stress ratio in different scenarios.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
Weipei Xue, Wei Xu, Wei Jing, Haopeng Li, Hanwen Zhang
Summary: The study revealed that the influence of early-age loading on concrete can be divided into different stages. As the loading increases, the concrete elastic modulus decreases while the Poisson's ratio initially increases and then decreases. When the loading is 10%, the number of macropores and cracks decreases, and the mechanical properties of concrete are not significantly affected; however, with a continuous increase in loading, the mesopores and cracks in concrete increase, leading to a deterioration in mechanical properties.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
K. Dhasindrakrishna, Kirubajiny Pasupathy, Sayanthan Ramakrishnan, Jay Sanjayan
Summary: Geopolymer foam concrete (GFC) with its porous structure offers lightweight, acoustic and thermal insulation, and fire resistance properties, which are influenced by materials, foaming methods, curing conditions, and additives. Further research is needed in understanding fresh properties, durability, and processing techniques to facilitate industrial applications and the development of 3D printable GFC.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Shravan Muthukrishnan, Sayanthan Ramakrishnan, Jay Sanjayan
Summary: This study investigates the influence of early age activation reactions on the yield strength development of 3D printable geopolymer concrete, using a rheo-chemical approach. The results show that by selecting appropriate activator, thixotropic additive, and retarder content, the printability of concrete can be enhanced.
CEMENT & CONCRETE COMPOSITES
(2021)
Review
Green & Sustainable Science & Technology
Ezzatollah Shamsaei, Owen Bolt, Felipe Basquiroto de Souza, Emad Benhelal, Kwesi Sagoe-Crentsil, Jay Sanjayan
Summary: The commercialization of geopolymer as a construction material is still in its infancy, with key issues related to material properties, economic factors, social attitudes, and regulatory standards needing to be addressed. It is essential to update and improve economic analysis of geopolymer utilization to forecast future costs effectively.
Article
Construction & Building Technology
Ehsan Negahban, Ali Bagheri, Jay Sanjayan
Summary: This study investigated the microstructural characteristics of geopolymer concrete and ordinary Portland cement concrete, revealing their correlation with strength and durability. The results showed that the pore volume of geopolymer concrete was significantly higher than that of ordinary Portland cement, and variations in parameters could control the mechanical properties and durability of the materials.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Computer Science, Interdisciplinary Applications
Mohsen Ebrahimzadeh Hassanabadi, Amin Heidarpour, Saeed Eftekhar Azam, Mehrdad Arashpour
Summary: A new unbiased recursive Bayesian smoothing method is proposed for input-state estimation of linear systems to reduce estimation uncertainty through an extended observation equation. Additionally, a new efficient method is introduced for the recursive calculation of correlation of state estimation error with modeling and observation noise vectors.
COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING
(2022)
Review
Green & Sustainable Science & Technology
Janitha Migunthanna, Pathmanathan Rajeev, Jay Sanjayan
Summary: Geopolymer binders using waste clay bricks as a precursor material show promising potential for use in pavement construction as an alternative cementitious material. Blending waste clay bricks with other materials or using them as the sole precursor can enhance the mechanical properties of geopolymer binders. Further research is recommended to explore the development, durability, and field performance of geopolymer concrete.
Article
Construction & Building Technology
Kala Kondepudi, Kolluru V. L. Subramaniam, Behzad Nematollahi, Shin Hau Bong, Jay Sanjayan
Summary: The rheological behavior of concrete mixtures made with AAFS binder paste was investigated, and its relation with 3D Concrete Printing performance was analyzed. The thixotropy of the mixtures mainly depended on the composition of the AAFS binder paste, regardless of aggregate content. Additives like nano-clay were used to control the rheology of the paste and enhance internal structure buildup. The yield stress of the concrete mixture was influenced by paste content, aggregate surface area, and solid packing.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Sayanthan Ramakrishnan, Sasitharan Kanagasuntharam, Jay Sanjayan
Summary: In-line activation of cementitious materials by encapsulating and introducing accelerators has been studied in this research. The results showed that the encapsulated accelerator rapidly transformed the concrete from a pumpable state to a stiffened state with improved mechanical properties. The flowability of the fresh printable mix was maintained before activation. The study also found that the homogeneity of the concrete reduced with increasing capsule dosage.
CEMENT & CONCRETE COMPOSITES
(2022)
Review
Green & Sustainable Science & Technology
Darshana Jayasooriya, Pathmanathan Rajeev, Jay Sanjayan
Summary: This study investigates the effects of graphene and graphene oxide on cement-based composites, particularly continuously reinforced concrete pavements (CRCP). Graphene-based nanomaterials show promise in overcoming various CRCP distresses, and the possibilities and hinderances of using graphene as reinforcement in cement-based composites are discussed. The potential of using graphene in CRCP is explored.
Article
Construction & Building Technology
Arun R. Arunothayan, Behzad Nematollahi, Kamal H. Khayat, Akilesh Ramesh, Jay G. Sanjayan
Summary: The rheological behavior of 3DP-UHPFRC was investigated, and it was found that the inclusion of steel fibers and nano-clay reduced workability and increased static yield stress, dynamic yield stress, and apparent viscosity. However, the effects became negligible at higher fiber or NC contents.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Nan Zhang, Jay Sanjayan
Summary: This study presents theoretical formulations for concrete extrusion resistance as a function of nozzle parameters. Results show that the extrusion resistances are related to the extrusion velocity of concrete and the cone angle and length of the nozzle. Based on the results, a customized nozzle was used to investigate the effects of print parameters on printing quality. It was found that the reduction of printing speed increased the limits of layer thickness.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Automation & Control Systems
Boda Ning, Qing-Long Han, Qiang Lu, Jay Sanjayan
Summary: This article focuses on the cooperative control of double-integrator type multirobot systems with uncertain control gain. Three different collective behaviors are investigated, including leaderless consensus, leader-following consensus, and formation control. Novel continuous controllers are designed based on sliding variables to achieve finite-time state agreement and leader tracking. Experimental studies are conducted to demonstrate the effectiveness of the proposed controllers for formation control of nonholonomic mobile robots.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2023)
Article
Construction & Building Technology
Nan Zhang, Jay Sanjayan
Summary: Quick mixing technology at the nozzle is a potential approach to improve productivity in 3D concrete printing. This study investigated the effects of rheological modifiers, CMC and nano-clay, on concrete mixing. Results showed that mixing resistance varied with different modifiers, with CMC being more influential. The quick mixing method resulted in better dispersion of modifiers but required more energy.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Nan Zhang, Jay Sanjayan
Summary: Quick Nozzle Mixing is a technique that solves the conflicting rheological requirements of buildability and pumpability in 3D concrete printing. The study investigates the mixing mechanism of concrete and the properties of mixing water with five surfactants. The results show that the surfactants play a significant role in mixing efficiency, with varying degrees of wetting ability.
CEMENT & CONCRETE COMPOSITES
(2023)
Review
Construction & Building Technology
Roshan Jayathilakage, Pathmanathan Rajeev, Jay Sanjayan
Summary: This study provides a comprehensive review of traditional and non-traditional methods for characterizing the rheological parameters of 3D concrete printing (3DCP) material. Experimental studies were conducted to compare different testing methods and identify their similarities, dissimilarities, pros, and cons. It was found that standard rheology measurement techniques have limitations when used for 3DCP material due to its unique properties, and non-conventional and novel techniques are needed for accurate rheological characterization.
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
