Article
Construction & Building Technology
James Dobrzanski, Richard Buswell, Sergio Cavalaro, Peter Kinnell, Weiqiang Wang, Jie Xu, John Kolawole
Summary: 3D concrete printing offers the advantage of one-off and low volume production with greater variability in part geometry by eliminating the need for a mould. However, the staircase effect from layering may not be desirable for smooth surfaces and interfaces between components. Additionally, global deformation of the part during printing can affect the accuracy of the final element, requiring post-printing treatments such as subtractive milling. Research has shown that high quality surfaces can be achieved, with roughness influenced by aggregate size in the mix and the material's set-state, leading to implications for process timing and robotic systems used in 3D concrete printing applications.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Pingping He, Sarra Drissi, Xiang Hu, Jianhui Liu, Caijun Shi
Summary: The synergistic effect of fly ash (FA) and ground granulated blast furnace slag (GGBS) on the early compressive strength and microstructure development of CO2-cured mortars was investigated. It was found that a rim containing silica-rich gel and crystal calcium carbonate was formed around carbonated cement particles. The shape and crystallinity of calcite formed on FA and GGBS particles were different. The incorporation of FA and GGBS increased the content of calcite and polymerization of silica-rich gel, but did not result in higher compressive strength due to the looser microstructure and nanopores in the carbonation products.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Chemistry, Physical
Nelli G. Muradyan, Avetik A. Arzumanyan, Marine A. Kalantaryan, Yeghiazar V. Vardanyan, Mkrtich Yeranosyan, Malgorzata Ulewicz, David Laroze, Manuk G. Barseghyan
Summary: This study explored the effect of biosilica concentration and two different mixing methods on the compressive strength of cement-based mortars. The results showed that the compressive strength was highest at a 10% biosilica concentration. The first mixing method increased compressive strength by 30.5% after 7 days of curing, while the second mixing method increased it by 23.4%.
Article
Construction & Building Technology
Yeswanth Sai Tatineni, Jagadeesh Putta
Summary: This paper discusses the improvements in the properties of cement mortar cube specimens by blending them with different components. The study found that the combination of 10% ultrafine slag and 0.03% graphene oxide showed the highest compressive strength and durability.
Article
Construction & Building Technology
Levent Koroglu, Derya Over Kaman, Erhan Ayas
Summary: The study found that heat-treated boron derivative wastes used as replacements for Portland cement significantly affected the strength of mortars due to their particle size distribution. Smaller particle sizes decreased the strength of mortars, while larger particle sizes reduced the strength significantly.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Sarkar Noor-E-Khuda
Summary: This study investigates the mechanical properties of a commercially available M3 type mortar in the marine environment, revealing a notable decrease in compressive, flexural, and pull-out strengths following accelerated wetting and drying cycles. Correlations between flexural and compressive strengths, and pull-out and compressive strengths are proposed, which may be useful for assessing mortar material properties during its service life.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Mohsen Ebrahimi, Abolfazl Eslami, Iman Hajirasouliha, Moein Ramezanpour, Kypros Pilakoutas
Summary: This study investigated the effect of ceramic waste powder (CWP) as a binder substitute in cement and lime-based masonry mortars. The results showed that cement mortars with CWP had no significant adverse effect on compressive and tensile strengths up to 50% replacement, and even increased at 10-20% substitution. The compressive and tensile strengths of lime mortars were continuously enhanced up to 70% replacement of lime with CWP. These findings suggest that CWP can be a sustainable binder replacement in construction, reducing carbon emissions and environmental impact.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
Fei Meng, Yaseen Muhammad, Shengbo Zhou, Zhaorong Zhu, Yuting Ye, Linlin Jiang, Jing Li
Summary: This study reports the synthesis of polystyrene-graphene nanosheets and octadecylamine-graphene nanosheets, which when added as additives can enhance the compressive and flexural strength of cement mortar. The chelating reaction of OA-GNs with Ca2+ was found to delay the hydration process of the cement mortar, providing important findings for practical applications in the construction industry.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Construction & Building Technology
Baoying Yu, Jianwei Zhou, Baojun Cheng, Wen Yang
Summary: The study found that the hardened MPC stone is a ceramic-like structure, which will be disrupted when aggregate is added, resulting in a weak interface transition zone, but still maintaining a high compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Jae-In Lee, Chae-Young Kim, Joo-Ho Yoon, Se-Jin Choi
Summary: In recent years, there has been a focus on recycling by-products of the paper industry for construction purposes. This study used waste newspaper instead of waste paper sludge ash, which has high energy consumption and contributes to air pollution. By integrating waste newspaper in cement mortar, improvements were observed in the compressive strength, tensile strength, and carbonation resistance of the mortar. The ideal amount of waste newspaper as a cement substitute was found to be 0.6% in terms of mechanical properties and durability characteristics.
Article
Green & Sustainable Science & Technology
I Tekin, I Dirikolu, H. S. Gokce
Summary: The study investigates the potential of pistachio shell ash as a supplementary cementitious material, finding that up to 20% incorporation can improve the compressive strength of cement, while the presence of graphitic structures in the ash enhances the mechanical and microstructural properties of cement.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Multidisciplinary Sciences
Md. Alhaz Uddin, Muhammad Tariq Bashir, Abdul Masroor Khan, Fahad Alsharari, Faizan Farid, Raid Alrowais
Summary: Silica fume improves the compressive strength and water resistance of cement mortar. The study examines the effects of silica fume on strength and water resistance in cement mixes, using various ratios of silica fume as a partial cement replacement. After 90 days of curing, the samples with a water-cement ratio of 0.4 exhibited the highest compressive strength and the highest ratio of saturated surface dry (SSD) to oven-dry state, indicating superior water resistance. This study concludes that silica fume has excellent pozzolanic activity and resistance to water, making it beneficial for the construction of durable concrete structures.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Construction & Building Technology
Peem Nuaklong, Narathip Boonchoo, Pitcha Jongvivatsakul, Tawatchai Charinpanitkul, Piti Sukontasukkul
Summary: The experimental study demonstrated that the addition of multi-walled carbon nanotubes and polypropylene fibers can enhance the mechanical properties and fire resistance of Portland-cement-based mortar. The optimal mix of 0.25% MWCNTs and 0.2% PP fibers showed a significant increase in residual compressive strength at high temperatures, indicating improved fire resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Jin Li, Peiyuan Chen, Haibing Cai, Ying Xu, Chunchao Li
Summary: The study found that using rice husk ash as a partial substitute for cement in rubber mortar can increase compressive strength without compromising it, and has positive effects on chloride resistance and capillary absorption. A dosage of 15% RHA was determined to be optimal for these enhancements.
Article
Construction & Building Technology
Aso A. Abdalla, Ahmed Salih Mohammed, Serwan Rafiq, Riyadh Noaman, Warzer Sarwar Qadir, Kawan Ghafor, Hind AL-Darkazali, Raed Fairs
Summary: Cement kilns play a crucial role in the production of cement and contribute significantly to greenhouse gas emissions. This study examines the effect of the components of cement kiln dust (CKD), namely silica and calcium oxide, on the long-term compressive strength of cement-based mortar. The results show that increasing the contents of silica and calcium oxide in CKD enhances the compressive strength of the mortar. Additionally, the curing time is identified as the most influential parameter in the prediction of compressive strength.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Environmental
Sabah A. Abdul-Wahab, Edris M. Hassan, Khalifa S. Al-Jabri, Kaan Yetilmezsoy
ENVIRONMENTAL ENGINEERING RESEARCH
(2019)
Article
Construction & Building Technology
Khalifa Al-Jabri, Hamada Shoukry, Ahmed Abdel Aal
PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-STRUCTURES AND BUILDINGS
(2020)
Article
Geosciences, Multidisciplinary
N. Sundararajan, Issa El-Hussain, Adel M. E. Mohamed, Ahmed Deif, Sheref El-Hady, Khalifa Al-Jabri, Ghazi Al-Rawas, Yahia El Zain, Andy Kwarteng, Mohammed Al-Wardi
JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA
(2019)
Article
Construction & Building Technology
Rajab Abousnina, Allan Manalo, Wahid Ferdous, Weena Lokuge, Benchaa Benabed, Khalifa Saif Al-Jabri
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Saleh N. Al-Saadi, Khalifa S. Al-Jabri
JOURNAL OF BUILDING ENGINEERING
(2020)
Article
Engineering, Civil
K. M. A. Sohel, K. Al-Jabri, A. H. S. Al Abri
Article
Engineering, Civil
Mahad Baawain, Hamada Shoukry, Khalifa Al-Jabri
Summary: The study shows that FeCr waste slag can replace natural fine sand in cement mortars without reducing compressive strength. Increasing FeCr aggregate replacement ratios decreases thermal conductivity and increases permeable void content, leading to significant drying shrinkage. Integrating GGBS with FeCr aggregates enhances compressive strength, reduces VPV and drying shrinkage, and improves microstructure.
INTERNATIONAL JOURNAL OF CIVIL ENGINEERING
(2021)
Article
Engineering, Environmental
Patrick Amoatey, Hamid Omidvarborna, Mahad Said Baawain, Issa Al-Harthy, Abdullah Al-Mamun, Khalifa Al-Jabri
Summary: The study found that industrial emissions in Oman have lower concentrations of pollutants compared to the limits set by the Ministry of Environment and Climatic Affairs (MECA) and WHO, resulting in low non-carcinogenic health effects. However, there was a slight increase in health risk when using WHO reference exposure level (REL) values due to their higher limits. Future epidemiological studies are needed to improve the accuracy of the human health risk assessment estimates.
JOURNAL OF ENVIRONMENTAL ENGINEERING AND SCIENCE
(2021)
Review
Construction & Building Technology
Ali Issa Fares, K. M. A. Sohel, K. Al-Jabri, Abdullah Al-Mamun
Summary: Industrial wastes and by-products have been explored for years as green construction materials. Among them, Ferrochrome slag (FCS) has recently attracted attention as a potential alternative construction material, particularly as a concrete aggregate.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Mervin Ealiyas Mathews, N. Anand, Diana A. Andrushia, Tattukolla Kiran, Khalifa Al-Jabri
Summary: The research investigates the flexural behavior of self-compacting concrete (SCC) exposed to elevated temperatures and retrofitted with different fiber wrappings. Results show that fiber wrapping, particularly carbon fiber, can improve the flexural strength of fire-affected SCC, with water-cooled specimens exhibiting higher damage levels compared to air-cooled specimens.
JOURNAL OF STRUCTURAL FIRE ENGINEERING
(2021)
Article
Construction & Building Technology
G. Jaya Kumar, Tattukolla Kiran, N. Anand, Khalifa Al-Jabri
Summary: This study investigates the effect of fire-resistant coating on post-fire residual mechanical properties of E350 steel grade. The results reveal that specimens coated with vermiculite and perlite exhibited higher residual mechanical property compared to other coatings, and water-cooled specimens had higher strength loss than air-cooled specimens.
JOURNAL OF STRUCTURAL FIRE ENGINEERING
(2023)
Article
Construction & Building Technology
Vijaya Prasad Burle, Tattukolla Kiran, N. Anand, Diana Andrushia, Khalifa Al-Jabri
Summary: In this study, a fibre-reinforced geopolymer concrete was developed and its mechanical properties and physical characteristics were evaluated under high temperatures. The influence of different fibre materials on the performance of the concrete was observed.
JOURNAL OF STRUCTURAL FIRE ENGINEERING
(2023)
Article
Construction & Building Technology
Varun Sabu Sam, M. S. Adarsh, Garry Robson Lyngdoh, Garry Wegara K. Marak, N. Anand, Khalifa Al-Jabri, Diana Andrushia
Summary: The capability of steel columns to support design loads is affected by exposure time and temperature magnitude. This research focuses on evaluating the buckling strength of heated CFS sections and analyzing the failure mode of CFS sections with different design configurations under elevated temperature.
JOURNAL OF STRUCTURAL FIRE ENGINEERING
(2023)
Article
Construction & Building Technology
Daniel Paul Thanaraj, N. Anand, Prince Arulraj, Khalifa Al-Jabri
JOURNAL OF BUILDING ENGINEERING
(2020)
Proceedings Paper
Architecture
Mohammed Seddik Meddah, Maryam Al Oraimi, Abdul Wahid Hago, Khalifa Al Jabri
4TH WORLD MULTIDISCIPLINARY CIVIL ENGINEERING-ARCHITECTURE-URBAN PLANNING SYMPOSIUM - WMCAUS
(2019)
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)