Article
Construction & Building Technology
Abdulkader El -Mir, Samer El-Zahab, Zoubir Mehdi Sbartai, Farah Homsi, Jacqueline Saliba, Hilal El-Hassan
Summary: This study evaluates the effect of mixture composition and age of concrete on the coefficient of variation of the rebound hammer index. Several machine learning models are utilized to predict the compressive strength of concrete. The results show that GPR/SVM and RT models yield the most accurate predictions when considering both mixture proportion and age of concrete.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Tiegang Zhou, Huiyuan Zhang, Boyang Li, Liangyi Zhang, Wei Tan
Summary: This study aimed to assess the quality of rammed earth walls by establishing a strength measurement curve based on concrete strength measurement curves. The effects of additive content, type, curing time, and rebound (R) values and ultrasonic pulse velocity (UPV) values were considered. The results showed that the R value and UPV increased with increasing cement content, and increased and stabilized with curing time. The difference in R value between the dense and sparse zones was within ±1, and the difference in UPV was within ±0.2 km/s. The ultrasonic-rebound combined method was found to be more accurate in predicting the UCS than the single R or UPV method. SEM tests were conducted to further validate the results.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Anindya Samya Saha, Khan Mahmud Amanat
Summary: This paper investigates the performance of normal strength concrete using the rebound hammer, focusing on the influence of coarse aggregate. Different types of concrete show specific correlations between rebound number and compressive strength, with empirical expressions proposed for each type. The study analyzes aggregate properties, mortar content, and water-cement ratio to explain the variation in compressive strength and rebound number, providing important insights for on-site concrete quality assessment.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
J. D. Rodriguez-Mariscal, J. Canivell, M. Solis
Summary: Historical rammed earth constructions require valid conservation evaluation methods, attracting attention from modern architecture for their ecological performance. Developing reliable non-destructive tests like ultrasonic and sonic tests is crucial for inspection.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Burcu Gunes, Serkan Karatosun, Oguz Gunes
Summary: This study proposes a drilling-based test methodology for estimating in-situ concrete strength. Experimental data demonstrate that using the drilling-resistance parameter (DR) in combination with rebound hammer (RH) and ultrasonic pulse velocity (UPV) tests provides a robust tool for predicting compressive strength. The support vector regression model shows promising performance even with limited data.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Mariella Diaferio, Francisco B. Varona
Summary: The assessment of concrete compressive strength is crucial for analyzing the seismic vulnerability of existing buildings. Traditional destructive tests are limited by their invasiveness, cost, and time. This study investigates the use of the rebound hammer test to overcome these limitations and extend investigations to a larger number of points.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Analytical
Temple Chimuanya Odimegwu, A. B. M. Amrul Kaish, Ideris Zakaria, Manal Mohsen Abood, Maslina Jamil, Kayode-Ojo Ngozi
Summary: The Schmidt rebound hammer test, a nondestructive test method used for quick assessment of concrete strength properties, was employed in this study. Industrial waste materials were used as replacement for fine aggregates in concrete, and a strong relationship between the rebound number and compressive strength was established.
Article
Construction & Building Technology
A. Koutous, E. Hilali
Summary: This study investigates the mechanical behavior of rammed earth under compression and indirect tensile stresses. Results show that plant fibers can enhance the strength of rammed earth, especially in tensile strength. Additionally, fibers decrease the stiffness of rammed earth while cement and lime increase it.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Environmental Sciences
Marco Loche, Gianvito Scaringi, Jan Blahut, Maria Teresa Melis, Antonio Funedda, Stefania Da Pelo, Ivan Erbi, Giacomo Deiana, Mattia Alessio Meloni, Fabrizio Cocco
Summary: This study proposes a method to evaluate the compressive strength of rock blocks by monitoring their thermal behavior with an infrared thermography and rebound hammer, observing a strong correlation between a simple cooling index and strength values. The research also noticed different heating-cooling patterns related to the nature, structure, and size of fractures in the rock blocks.
Article
Construction & Building Technology
Liusheng He, Binod Khadka, Xiaobo Sun, Ming Li, Jiafei Jiang
Summary: This paper proposes the use of rammed earth filled steel tubular columns for sustainable building construction. Experimental tests were conducted to investigate both the material and member levels. The results show that adding cement significantly enhances the axial capacity of the rammed earth. A method to estimate the compressive strength considering the cement content is proposed. It is also suggested to control the strength ratio between the steel tube and infill rammed earth to fulfill the confinement effect.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Shuvo Dip Datta, Md. Habibur Rahman Sobuz, Abu Sayed Mohammad Akid, Shoaib Islam
Summary: This paper presents an experimental investigation of the properties of recycled aggregate concrete (RAC) prepared with varying sizes and replacement levels of coarse aggregate. The results show that RAC achieves lower performance values with the increment of recycled aggregate replacement level. Additionally, concrete with smaller aggregate size exhibits better performance. Empirical relationships between destructive and non-destructive testing techniques are also established to efficiently predict the properties of RAC.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Luisa Maria Gil-Martin, Manuel Alejandro Fernandez-Ruiz, Enrique Hernandez-Montes
Summary: This study presented a mechanical characterization of unstabilized rammed earth, including the determination of compressive strength, Young's modulus, and Poisson's ratio; creep behavior of rammed earth material and elastic stiffness degradation phenomenon were also investigated.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Engineering, Civil
Yue Wu, Junkai Huang, Xiaonan Lou
Summary: The rebound method for ice materials was established in this study, and both plain ice and fiber-reinforced ice were tested. It was found that the rebound value of fiber-reinforced ice decreased with increasing fiber content, while the rebound value of plain ice varied with different temperatures. The relationship between rebound value and uniaxial compressive strength (UCS) of ice materials was established, and the NDT method was proven to be effective in safety assessment of ice and snow buildings in Harbin.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ali H. AlAteah, Khaled A. Alawi Al-Sodani, Moruf Olalekan Yusuf, Adeshina A. Adewumi, Mohammed M. H. Al-Tholaia, Azeez Oladipupo Bakare, Ibrahim Momohjimoh, Abdullahi Kilaco Usman
Summary: The use of waste glass powder (WGP) and silica fume (SF) powder as partial replacements for ordinary Portland cement in ternary blended concrete was investigated to promote solid waste utilization in concrete production. The concrete specimens were prepared with a binder consisting of 90% cement and 10% silica fume and waste glass powder. Models were developed to analyze the wet density, strength development, compressive strength, and elastic/shear moduli of the concrete. Additionally, the impact of geometrical shape and aspect ratio on transverse response frequencies were studied.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Multidisciplinary
Leticia Presa, Jorge L. Costafreda, Domingo Alfonso Martin
Summary: This study aims to investigate the relationship between the compression resistance and velocity of ultrasonic pulses in mortars with pozzolanic content. The results show a correlation between ultrasonic pulse velocity and compressive resistance, which provides a basis for further research with a larger number of samples to confirm its validity at greater curing ages.
APPLIED SCIENCES-BASEL
(2021)
Article
Mathematics
Raul M. Falcon, Victor Alvarez, Maria Dolores Frau, Felix Gudiel, Maria Belen Guemes
Summary: This paper explores the generalization of the classical design of cocyclic Hadamard matrices, introducing the concept of the pseudococycle of a partial Hadamard matrix over a Latin rectangle and comprehensively studying and illustrating its fundamentals.
Article
Chemistry, Multidisciplinary
Alvaro R. Serrano-Chacon, Emilio J. Mascort-Albea, Jacinto Canivell, Rocio Romero-Hernandez, Antonio Jaramillo-Morilla
Summary: This study examines the stability of historical ramparts functioning as retaining walls through the use of parametric calculation tools. The case study of the medieval ramparts of Seville, Spain, exemplifies the importance of structural assessments for such heritage structures. Automatic calculations assist in verifying overall stability and identifying risks posed by changes in the surrounding environment.
APPLIED SCIENCES-BASEL
(2021)
Article
Mathematics
Manuel Ceballos, Raul M. Falcon, Juan Nunez-Valdes, Angel F. Tenorio
Summary: This paper discusses the past and present research on evolution algebras, as well as the most relevant topics related to them.
EXPOSITIONES MATHEMATICAE
(2022)
Article
Construction & Building Technology
J. J. Martin-del-Rio, J. Canivell, Marta Torres-Gonzalez, E. J. Mascort-Albea, R. Romero-Hernandez, J. M. Alducin-Ochoa, F. J. Alejandre-Sanchez
Summary: This study aims to investigate the material characterization of the most recognizable section of the Seville City Wall, discovering that capillary humidity and salt transport and crystallization are the main causes of deterioration. The results of the study provide a solid criterion for restoration proposals, making an interesting reference for similar interventions on rammed earth military structures.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Archaeology
Marta Torres-Gonzalez, Juan Jesus Martin-Del-Rio, Francisco Javier Alejandre-Sanchez, Miguel Leon Munoz, David Bienvenido-Huertas, Juan Manuel Macias Bernal
Summary: This study provides methodological guidelines for the conservation of plasterwork and its polychromies, and presents the implementation process and validation of a specific case. The reconstruction of plasterwork was successfully achieved using current restoration techniques and digital tools.
STUDIES IN CONSERVATION
(2023)
Article
Mathematics
Raul M. Falcon, Nagaraj Mohanapriya, Venkitachalam Aparna
Summary: A t-dynamic proper n-coloring of a graph G describes a shadow allocation for a secret sharing scheme based on G, where each participant can either reconstruct the secret or obtain a different shadow from their neighbors after just one round of communication. This paper explores the use of extended neighborhood coronas to model communication networks and solves the dynamic coloring problem for certain types of extended neighborhood coronas.
Article
Construction & Building Technology
Francisco M. Hidalgo-Sanchez, Marta Torres-Gonzalez, Emilio J. Mascort-Albea, Jacinto Canivell, Rocio Romero-Hernandez, J. J. Martin-del-Rio
Summary: Non-destructive testing (NDT) has been proven to be a sustainable approach in the preventive conservation of heritage buildings. However, the management of NDT information is complex, resulting in suboptimal data usage. This paper proposes a method for integrating NDT data into simplified digital information models using Geographic Information Systems (GIS). Applied to the plasterwork in the Courtyard of the Maidens in the Royal Alcazar of Seville, a web GIS-based model integrates NDT information, such as ambient conditions, damage mapping, and various measurements, enabling the detection of vulnerable areas and providing accessible results for managers.
BUILDING RESEARCH AND INFORMATION
(2023)
Article
Mathematics, Applied
Raul M. Falcon, M. Venkatachalam, S. Julie Margaret
Summary: The paper solves the b-coloring problem for subdivision-edge neighborhood coronas of paths, cycles, stars, and complete graphs. It also establishes exact values and sharp bounds for the b-chromatic number of these graphs with any other graph.
DISCRETE MATHEMATICS ALGORITHMS AND APPLICATIONS
(2023)
Article
Construction & Building Technology
Cristina Rivero-Camacho, Juan Jesus Martin-del-Rio, Madelyn Marrero-Melendez
Summary: This article introduces a methodology for forecasting the environmental and economic impacts throughout the building life cycle. Residential buildings in Andalusia were studied from conception to demolition. Indicators such as carbon footprint, water footprint, ecological footprint, and embodied energy were adapted for evaluating each phase of the cycle: land use transformation, construction, maintenance, and demolition. The methodology allows for identifying the sources of greatest impact in each phase, facilitating the evaluation of future design effects.
SUSTAINABLE CITIES AND SOCIETY
(2023)
Article
Mathematics, Interdisciplinary Applications
Raul M. Falcon, Venkitachalam Aparna, Nagaraj Mohanapriya
Summary: Dynamic coloring is a valuable tool for optimizing cryptographic protocols based on secret sharing. This paper focuses on the dynamic coloring problem for degree splitting graphs and proposes a solution using control nodes to enhance secrecy.
NETWORKS AND HETEROGENEOUS MEDIA
(2023)
Article
Construction & Building Technology
Evelyn Delgado-Gutierrez, Jacinto Canivell, David Bienvenido-Huertas, Carlos Rubio-Bellido
Summary: This study analyzes social housing prototypes in four climate zones in Ecuador, showing that improvement measures have different effects on comfort ranges depending on the climate zone and different behavior between upper and ground floor dwellings. The study suggests that prototype solutions for social housing should be adapted with various improvement measures and specific requirements for acceptable comfort levels.
Article
Mathematics, Applied
Raul M. Falcon, M. Venkatachalam, S. Gowri, G. Nandini
Summary: This paper explicitly obtains the r-dynamic chromatic number of the direct product of a path P-m and a k-subdivision S-n(1/k) of a star graph, showing that the chromatic number is between 2 and 2n + 1.
DISCRETE MATHEMATICS ALGORITHMS AND APPLICATIONS
(2022)
Article
Mathematics, Applied
Rebecca J. Stones, Raul M. Falcon, Daniel Kotlar, Trent G. Marbach
Summary: This study explores various methods for computing the autotopism group of a partial Latin rectangle, comparing different algorithms and highlighting the importance of entry invariants. Symmetries should be mathematically identified rather than computed, quick-to-compute entry invariants can reduce computational needs, and more sophisticated entry invariants are required for almost-full partial Latin rectangles. Additionally, the performance for (full) Latin squares and almost-full partial Latin squares is noticeably worse due to the presence of Latin squares with large autotopism groups.
COMPUTATIONAL AND MATHEMATICAL METHODS
(2021)
Article
Mathematics, Applied
Raul M. Falcon, M. Venkatachalam, S. Gowri, G. Nandini
Summary: This paper determines the r-dynamic chromatic number of the fan graph F-m,F-n and sharp bounds of this graph invariant for four related families of graphs, as well as the r-dynamic chromatic number of each family when m = 1.
ANALELE STIINTIFICE ALE UNIVERSITATII OVIDIUS CONSTANTA-SERIA MATEMATICA
(2021)
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)
