Abstract
Textile reinforced concrete (TRC) has gained attention as a viable alternative to conventional reinforced concrete due to its improved mechanical properties and design adaptability. Despite significant research into the mechanical properties of TRC, studies regarding the flexural effect of pre-stretching with different numbers of textile reinforcements are currently limited. Therefore, this research focuses on assessing the flexural characteristics of TRC panels with the incorporation of mesh prestretching. Additionally, the study compares the flexural behaviour between alkali-resistant (AR) glass fibre TRC and carbon fibre TRC. A three-point bending test was conducted to assess the flexural behaviour of TRC, investigating the impact of the number of textile layers and the application of pre-stretching on flexural strength and post-cracking stiffness. The findings, exhibited by the flexural stress vs. displacement curve, indicate that applying pre-stretching to carbon fibre TRC effectively increases the flexural strength of carbon textiles and enhances post-cracking stiffness. Moreover, the greater the number of carbon textiles, the higher the flexural stress of the specimens, provided the textiles are placed in the tensile zone. Nevertheless, when comparing carbon fibre TRC with AR glass fibre TRC, it is found that the increase in flexural strength is more significant for carbon fibre TRC. Overall, applying pre-stretching to carbon fibre significantly improves the TRC's flexural performance, specifically during the post-cracking stage and in crack distribution. Furthermore, due to the higher elastic modulus and tensile strength of carbon fibre, TRC reinforced with carbon textiles shows greater flexural strength and ductility compared to AR glass fibre TRC.
Address
(1) Rose Dayaana Amran, Irvin Liow Jun Ann, Geok Wen Leong, Chee Ghuan Tan, Kim Hung Mo:
Department of Civil Engineering, Faculty of Engineering, Universiti Malaya, 50603 Kuala Lumpur, Malaysia;
(2) Kok Seng Lim:
Photonics Research Centre, Universiti Malaya, 50603 Kuala Lumpur, Malaysia;
(3) Fadzli Mohamed Nazri:
School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia.
Abstract
Nano-silica's growing use in construction, known for enhancing strength and durability by reducing porosity, drives this research's significance, especially considering Ecuador's reliance on cement in construction. A comprehensive comparative study on mortars made with General Use cement and aggregates from Pifo and San Antonio quarries has been studied. It explores the impact of incorporating nano-silica in varying proportions (0.75%, 1.00%, 1.25%) on mortar properties, contrasting them with conventional and prefabricated mortars. laboratory Testing is conducted according to standards to assess both fresh and hardened state properties, and microscopic analysis reveals the optimal nano-silica proportion's effects on mortar characteristics. Results shows that Incorporating 0.75% nano-silica resulted in a 61% increase in compressive strength at 7 days and. For a nanosilica content of 1.25%, a 14% increase in compressive strength was observed at 28 days in relation to the conventional mortar and the permeability of the mortar decreased by 30% when adding 0.75% nanosilica. It discusses economic viability and provides insights through SEM and EDS analyses. Overall, it underscores nano-silica's potential to enhance mortar properties and its relevance in creating more efficient and durable construction materials.
Key Words
concrete additives; Holcim GU Cement; mortar; nano-materials; nano-silica; properties in plastic and hardened states; surface microscopic characterization
Address
(1) Mohammadfarid Alvansazyazdi:
Institute of Science and Concrete Technology, ICITECH, Universitat Politècnica de València, Spain;
(2) Mohammadfarid Alvansazyazdi, Jorge Figueroa, Alex Paucar, Gilson Robles:
Faculty of Engineering and Applied Sciences, School of Civil Engineering, Central University of Ecuador, Av. Universitaria, Ecuador;
(3) Mohammadfarid Alvansazyazdi:
Faculty of Engineering, Industrial and Architecture, School of Civil Engineering, Laica Eloy Alfaro de Manabi University, Manta, Ecuador;
(4) Majid Khorami:
Faculty of Architecture and Urban Planning, University of UTE, Calle Rumipamba S/N y Bourgeois, Quito, Ecuador;
(5) Pablo M. Bonilla-Valladares:
Faculty of Chemical Sciences, Central University of Ecuador, Francisco Viteri s/n and Gilberto Gato Sobral, Quito 170521, Ecuador;
(6) Alexis Debut:
Department of Life Sciences and Agriculture, Center for Nanoscience and Nanotechnology, University of the Armed Forces ESPE, Ecuador;
(7) Mahdi Feizbahr:
School of Civil Engineering, Engineering Campus, University Sains Malaysia, Nibong Tebal, Penang, Malaysia.
Abstract
The calculation of the natural frequencies versus Young's modulus of carbon nanotubes with modified continuum shell is the subject of current research. When designing these tubes, it is important to understand their frequencies because excessive vibrations might cause fatigue. These tubes are designed and built to meet specific needs and have been suitably modified to investigate their vibratory response. There are numerous uses for carbon nanotube free vibration analysis in the mechanical sciences. The fundamental frequency with Young's modulus for clamped-free and simply supported end conditions, which is connected to the carbon nanotubes, is calculated theoretically for chiral single carbon nanotubes. When Young's modulus rises, so does the frequency curve pattern. Young's modulus influences the single-walled carbon nanotube's dynamic response by simulating it as a modified continuum shell. The Young's modulus of chiral tube and the value of frequency increased as the chiral tube's index increased. The results are checked against past studies to ensure the problem's validity and are determined to be accurate.
Key Words
distinct boundary conditions; dynamic response; frequency; material parameters; stress-stain curves
Address
(1) Ikram Ahmad, Sana Shahzadi, Bazal Fatima:
Department of Chemistry, University of Sahiwal, Sahiwal, 57000, Pakistan;
(2) Mohamed A. Khadimallah:
Department of Civil Engineering, College of Engineering in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia;
(3) Hamdi Ayed:
Department of Civil Engineering, College of Engineering, King Khalid University, Abha - 61421, Saudi Arabia;
(4) Rana Muhammad Akram Muntazir:
Department of Mathematics, Lahore Leads University, 54792, Lahore, Pakistan;
(5) Muzamal Hussain:
Department of Mathematics, University of Sahiwal, Sahiwal, 57000, Pakistan;
(6) Abir Mouldi:
Department of Industrial Engineering, College of Engineering, King Khalid University, Abha - 61421, Saudi Arabia;
(7) Sehar Asghar, Waheed Iqbal:
Department of Mathematics, Government College University Faisalabad, 38000, Faisalabad, Pakistan;
(8) Fatima Zahra:
School of Science, Department of Mathematics, University of Management and Technology (UMT), Pakistan;
(9) Essam Mohammed Banoqitah:
Nuclear Engineering Department, Faculty of Engineering, King Abdulaziz University, Jeddah P.O. Box 80204, Jeddah 21589, Saudi Arabia.
Abstract
The interaction of short range zigzag single walled carbon nanotubes CNTs based on modified elasticity model is studied in this paper. The numerical accurate results are presented. Through this model the vibrational frequency of zigzag (5, 0), (12, 0) single-walled CNTs with certain end conditions are estimated. The natural frequencies of single walled carbon nanotubes are obtained by elasticity model. It is considered for various estimation of height-to-diameter ratio of zigzag tube. This simulation is performed to quantify small scale effects. Moreover, the natural frequencies increase by increasing the height-todiameter ratio. These frequencies are very sensitive with low height-to-diameter ratio. The feasibility and effective use of present model is explained by comparison of outputs of earlier investigations.
Key Words
certain end conditions; elastic theory; height-to-diameter ratio; scale effects; zigzag tube
Address
(1) Rana Muhammad Akram Muntazir:
Department of Mathematics, Lahore Leads University, 54792, Lahore, Pakistan;
(2) Abdur Rauf, Ikram Ahmad, Lubna Rasool, Bazal Fatima:
Department of Chemistry, University of Sahiwal, Sahiwal, 57000, Pakistan;
(3) Mohamed A. Khadimallah:
Department of Civil Engineering, College of Engineering in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj, 11942, Saudi Arabia;
(4) Hamdi Ayed:
Department of Civil Engineering, College of Engineering, King Khalid University, Abha - 61421, Saudi Arabia;
(5) Muzamal Hussain:
Department of Mathematics, University of Sahiwal, Sahiwal, 57000, Pakistan;
(6) Abir Mouldi:
Department of Industrial Engineering, College of Engineering, King Khalid University, Abha - 61421, Saudi Arabia;
(7) Sehar Asghar:
Department of Mathematics, Government College University Faisalabad, 38000, Faisalabad, Pakistan;
(8) Essam Mohammed Banoqitah:
Nuclear Engineering Department, Faculty of Engineering, King Abdulaziz University, Jeddah P.O. Box 80204, Jeddah 21589, Saudi Arabia.
Abstract
Disposal of waste glass derived from bottle or packaging glass, flat glass, domestic glass is one of the major environmental defies. Moreover, the remnants of bricks resulting from the remnants of buildings are also considered an important factor in polluting the environment due to the difficulty of filling or getting rid it. The aim of this study is to valorize these wastes through chemical activation to be an environmentally friendly material. The Microstructure, compressive strength, setting time, drying shrinkage, water absorption of different pastes produced by clear glass (CG), green glass (GG) and brick waste (BP) activated were tested and recorded after curing for 3, 7, 28 and 365 days. Five samples of pastes were mixed in proportions represented by: 100% GP (GP), 100% GGP (GGP), 100% BP (BP), 90% GP + 10% BP (GPB) and 90% GGP + 10% BP (GGPB). Various parameters considered in this study include sodium hydroxide concentrations (10 mol/l); 0.4 as alkaline liquid to binder ratio; 2.5 as sodium silicate to sodium hydroxide ratio and cured at 60°C for 24 hours. Experimental results revealed that the addition of 10% of BP resulted in an increased strength performance of geopolymer paste especially with GGPB compared to GGP in 365 days. In addition, the 10% amount of BP increases the absorption and shrinkage rate of geopolymer pastes (GPB and GGPB) by reducing the setting time. SEM results revealed that the addition of BP and GP resulted in a dense structure.
Key Words
absorption; activators; compressive strength; glass-brick wastes; microstructure; setting time
Address
(1) I.Y. Omri, Z. Rahmouni:
Faculte of Technology, Geomaterials Development Laboratory, M'sila University, M'sila (28000), Algeria;
(2) N. Tebbal:
Institute of Technical Urban Management, Geomaterials Development Laboratory, M'sila University, M'sila (28000), Algeria
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