Article
Chemistry, Multidisciplinary
Derrick Mirindi, Richard O. Onchiri, Joseph Thuo
Summary: This study investigated the physical and mechanical properties of particleboard made from macadamia nutshells mixed with gum Arabic, showing that particleboards with 50% gum Arabic and 50% macadamia nutshells performed well in terms of water absorption, thickness swelling, and strength. These particleboards met the standard for general-purpose boards, except for water absorption and thickness swelling characteristics.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Wiktor Szewczenko, Galyna Kotsay
Summary: This article explores the impact of water glass on the hydration and properties of Portland cement. Different methods of introducing water glass can be used to regulate the setting time and flow properties of cement slurries, which is crucial during transportation.
Article
Construction & Building Technology
Suleyman Ozen, Muhammet Gokhan Altun, Ali Mardani-Aghabaglou, Kambiz Ramyar
Summary: This study investigated the effect of main and side chain lengths of polycarboxylate ether-based high-range water-reducing admixtures (WRAs) on the properties of cementitious systems. It was found that longer or shorter chain lengths of the admixtures negatively affected the flowability of paste and mortars, while moderate chain lengths improved the time-dependent flow properties. The compressive strength and water absorption capacity of the mortar mixtures were not significantly influenced by the chain lengths of WRAs. However, an increase in fly ash substitution negatively affected the flow and time-dependent flow properties of the mixtures but decreased water absorption.
MAGAZINE OF CONCRETE RESEARCH
(2022)
Review
Green & Sustainable Science & Technology
A. A. Raheem, R. Abdulwahab, M. A. Kareem
Summary: The construction industry is seeking innovative, cost efficient, and eco-friendly materials to replace conventional concrete, including natural materials, industrial byproducts, and agricultural wastes. Research is needed to understand the impact of different sources of materials on properties, and how to enhance early strength development in concrete.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Geological
Irem Bozyigit, Akbar Javadi, Selim Altun
Summary: This study investigated the effects of biopolymers on the mechanical behavior of kaolin clay, revealing that the addition of biopolymers can increase the compressive strength of clay, with guar gum showing a more significant increase in strength. Furthermore, increasing water content led to more ductile behavior and increased axial deformation in the specimens.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Ahmed Salih, Serwan Rafiq, Parveen Sihag, Kawan Ghafor, Wael Mahmood, Warzer Sarwar
Summary: Through the analysis and modeling of 450 experimental data, it is found that the compressive strength of cement mortar can be well predicted in terms of water-to-binder ratio, fly ash incorporation ratio, and curing time using various simulation techniques. The research concludes that curing time is the most dominating parameter for predicting the compressive strength of cement mortar with this dataset.
Article
Chemistry, Physical
Tulane Rodrigues da Silva, Daiane Cecchin, Afonso Rangel Garcez de Azevedo, Izabella Valadao, Jonas Alexandre, Flavio Castro da Silva, Markssuel Teixeira Marvila, Murali Gunasekaran, Fabio Garcia Filho, Sergio Neves Monteiro
Summary: This study successfully added up to 30% PET waste particles into soil-cement bricks, increasing the compressive strength from 0.83 MPa to 1.80 MPa. The water absorption values met standards, making the bricks suitable for non-structural applications in building construction.
Article
Construction & Building Technology
Jianfen Li, Shujin Li, M. Aminul Haque, Bing Chen
Summary: Portland composite cement (PCC) is a low-carbon and low-cost cement, widely used in infrastructure development. However, PCC concrete has lower strength and waterproofing performance compared to Ordinary Portland cement (OPC) concrete. This research aims to improve the water-resistant quality of PCC concrete using the waterproofing chemical liquid admixture Sika & REG; Membrane-2000.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Jin Pan, Kun Feng, Pengju Wang, Haiming Chen, Wenqian Yang
Summary: A new method of upcycling waste carrot into a natural admixture for cement mortars was proposed, which effectively inhibited the early hydration of cement and improved the compressive strength of cement mortars simultaneously.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Kawan Ghafor
Summary: In this study, three different models were developed to predict the compressive strength of SCC. A set of 400 data was collected and analyzed to evaluate the effect of seven variables on CS. The results showed that the artificial neural network model performed the best in terms of prediction performance and curing time had the greatest impact on the forecast for FA-modified SCC.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Ahmed Mohammed, Serwan Rafiq, Parveen Sihag, Rawaz Kurda, Wael Mahmood
Summary: This study aims to evaluate and model the hardness of concrete mixtures with high-volume fly ash (HVFA) to meet environmental design standards, and establish systematic multiscale models to predict the compressive strength of HVFA concrete mixes, using various technical approaches for analysis and modeling.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Computer Science, Interdisciplinary Applications
Zhanbo Cheng, Xueyu Geng
Summary: The efficiency of biopolymer-treated soil depends on various factors such as the type and concentration of biopolymer used, soil type, initial water content, curing time, and mixing method. In this study, the effects of xanthan gum (XG) treatment on the physical and mechanical properties of kaolinite were investigated. The results showed that XG treatment increased the optimum water content and plastic limit of the clay, while the maximum dry density varied with XG concentration. The study also found that the ideal water content and curing time for achieving maximum compressive strength varied with XG content, with hot-dry mixing yielding the highest strength compared to other mixing methods.
COMPUTERS AND CONCRETE
(2023)
Article
Construction & Building Technology
Enes Ekinci
Summary: This paper investigates the effects of construction and demolition wastes (CDW) as fine aggregate on the performance of geopolymer mortar (GPM) specimens. The study found that the compressive strength of GPM samples can be increased by choosing water curing instead of curing in ambient conditions. However, increasing the NaOH concentration and CDW usage ratio leads to decreased workability of GPM samples and sharp decrease in mechanical and physical characteristics at elevated temperatures.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Fei Meng, Lei Dong, Yuanlong Wu, Xin Shu, Yandong Guo, Qianping Ran
Summary: Inspired by the design of biomaterials, this study proposed and demonstrated the encapsulation of a hydrophobic core with a hydrophilic shell to improve the resistance to water absorption in cement paste. The use of the encapsulated capsule resulted in increased compressive strength and reduced water absorption compared to other additives. This was attributed to the improved dispersion and sustained release of the hydrophobic core in water, leading to improved hydration and refined pore structures in the cement paste.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Muhammet Gokhan Altun, Suleyman Ozen, Ali Mardani, Kambiz Ramyar
Summary: This study investigated the effect of the main chain length of polycarboxylate-based water-reducing admixture (WRA) on the properties of mortar mixtures containing fly ash. Three WRAs with different main chain lengths were used. Increasing the main chain length improved the flow properties of the mixtures up to a certain level, but beyond that, it had a negative effect. The molecular weight of the admixtures was adjusted by changing the main chain length, and the admixture with a molecular weight of 48 kg/mol showed the best performance in terms of mortar fresh properties. The length of the main chain did not significantly affect compressive strength and water absorption of the mortar.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Augustine Uchechukwu Elinwa
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Construction & Building Technology
Augustine U. Elinwa, Stephen P. Ejeh, Ahmed M. Mamuda
CONSTRUCTION AND BUILDING MATERIALS
(2008)
Article
Architecture
Augustine U. Elinwa, Elvis Mbadike
JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEERING
(2011)
Article
Construction & Building Technology
Augustine U. Elinwa, Mamuda, M. Ahmed
ADVANCES IN CONCRETE CONSTRUCTION
(2014)
Article
Construction & Building Technology
Augustine U. Elinwa, Ahmed M. Mamuda
ADVANCES IN CIVIL ENGINEERING
(2014)
Article
Construction & Building Technology
Augustine Uchechukwu Elinwa, Nasir Kabir
ACI MATERIALS JOURNAL
(2019)
Article
Construction & Building Technology
Augustine U. Elinwa, Mohammed Umar
CONSTRUCTION AND BUILDING MATERIALS
(2017)
Article
Engineering, Civil
Augustine Uchechukwu Elinwa
CIVIL ENGINEERING AND ENVIRONMENTAL SYSTEMS
(2006)
Article
Construction & Building Technology
A. U. Elinwa
CONSTRUCTION AND BUILDING MATERIALS
(2006)
Article
Construction & Building Technology
AU Elinwa, YA Mahmood
CEMENT & CONCRETE COMPOSITES
(2002)
Article
Construction & Building Technology
AU Elinwa, M Joshua
JOURNAL OF CONSTRUCTION ENGINEERING AND MANAGEMENT-ASCE
(2001)
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)