Article
Construction & Building Technology
Shujun Li, Jianming Gao, Qiuyi Li, Xiaolong Zhao
Summary: The study investigates the properties of recycled concrete powder (RCP) and recycled brick powder (RBP) and their impact on mortar properties. It was found that RBP has a lower negative impact on mortar workability compared to RCP due to its lower specific surface area and porosity, and contributes significantly to flexural strength.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
Ali S. Alqarni
Summary: Recent developments in recycling techniques have transformed non-renewable resources into partially renewable resources. Supplementary cementitious materials (SCMs) in concrete play a critical role in minimizing waste and reducing carbon dioxide emissions. Volcanic pumice powder ash (VPPA) shows great potential in the production of eco-friendly concrete and helps alleviate disposal problems. This article provides a comprehensive review of the utilization of VPPA in concrete and its impact on concrete characteristics, as well as highlights future research advancements in this field.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Haochen Wang, Tingye Qi, Guorui Feng, Xiaoze Wen, Zehua Wang, Xudong Shi, Xianjie Du
Summary: The study found that CSFA can replace up to 40% of fly ash in CCGB, improving its mechanical properties but potentially causing drying shrinkage. Higher substitution amounts led to increased UCS and shear strength. CSFA has a coarser particle size, higher pozzolanic reactivity, more reactive silica/alumina, and later reaction stage compared to fly ash, making it a viable supplementary cementitious material in CCGB.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Construction & Building Technology
Muhammad Usama Salim, Mohammad Ali Mosaberpanah, Aamar Danish, Naveed Ahmad, Raja Abubakar Khalid, Carlos Moro
Summary: Bauxite residue, also known as red mud, is being explored as a binding agent in cementitious composites to enhance their mechanical properties and durability. This review article provides an overview of the characteristics of bauxite residue and discusses its impact on cementitious composites, including their mechanical properties and durability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Chemical
Yunpeng Qi, Qiusheng Wang, Hao Luo, Peng He, Qihua Deng
Summary: This study aims to investigate the role of calcium sulfate as an activator in cementitious composites. The results show that the addition of calcium sulfate can promote the formation of ettringite, improve the early strength of high-volume fly ash PVA-ECC, and reduce the tensile strain. In addition, an evaluation method for obtaining high tensile strain and the optimal mix ratio were proposed based on the analysis of the failure mechanism.
Review
Green & Sustainable Science & Technology
B. S. Thomas, J. Yang, A. Bahurudeen, J. A. Abdalla, R. A. Hawileh, H. M. Hamada, S. Nazar, V Jittin, D. K. Ashish
Summary: The massive development in infrastructure has led to a rise in demand for cement, resulting in 30 billion tonnes of cement concrete being used annually. Researchers globally are exploring turning industrial waste like sugarcane bagasse ash into sustainable solutions for carbon-neutral construction practices. Studies show that incorporating sugarcane bagasse ash in concrete can enhance its performance and durability, reducing permeability and improving strength.
MATERIALS TODAY SUSTAINABILITY
(2021)
Article
Engineering, Environmental
Lizheng Jin, Min Chen, Yufeng Wang, Yaqi Peng, Qi Yao, Jiamin Ding, Binbin Ma, Shengyong Lu
Summary: With the rapid development of municipal solid waste incineration, the effective disposal and recycling utilization of fly ash has become increasingly important. Mechanochemical treatment has shown good results in stabilizing heavy metals and degrading dioxins in fly ash. The use of composite additives in the treatment process has proven to be the most effective in inhibiting heavy metals, significantly reducing their leaching concentration. Additionally, the treatment process improves the activity and performance of fly ash, making it an ideal supplementary cementitious material for concrete blocks.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Feng Luo, Yujie Jin
Summary: This study compares the performance of coal-based fly ash and coal gasification fly ash as supplementary cementitious materials. The results show that although coal gasification fly ash has a greater negative effect on the fluidity of cement mortar, it has a greater contribution to the strength. Additionally, ultrafine treatment of coal gasification fly ash can improve its reactivity and reduce the negative effect on fluidity.
Review
Construction & Building Technology
V Jittin, S. N. Minnu, A. Bahurudeen
Summary: The use of bagasse ash in the cement industry is hindered by a lack of information on its influence on concrete, but its blended concrete shows higher strength than control concrete at certain levels of cement replacement. Bagasse ash or rice husk ash blended concrete exhibits significant resistance against chloride, water, and air permeability at their optimum replacement levels.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
G. Athira, A. Bahurudeen, Srinivas Appari
Summary: The study found that rice-straw ash obtained from pyrolysis temperatures up to 700 degrees C were amorphous and contained reactive silica, with 10% replacement level being the optimum and concrete with 20% replacement level exhibiting better performance against water penetration and chloride ingress.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Guanglong Yu, Yanmin Jia
Summary: In this paper, the preparation methods of geopolymer were investigated, with a focus on the effects of slag and fly ash proportion, modulus of water glass, and water-binder ratio on the microstructure and mechanical properties of geopolymer. The optimal mix ratio was obtained through orthogonal experiments, and the influences of various factors on the geopolymer were analyzed through testing methods.
Article
Construction & Building Technology
Wenyan Zhang, Shuai Wang, Xiaohang Duan, Yuzhong Jin, Chunhua Feng, Jianping Zhu, Faqiang Su
Summary: This study investigated the influence of low-calcium circulating fluidized bed fly ash (LCFA) on cement-based materials and the synergistic effect with an alkali activator. The results showed that the addition of LCFA improved the compressive strength, physical properties, and carbonization resistance of cement-based materials. Furthermore, adding water glass (WG) shortened the setting time and increased the compressive strength, chloride ion penetration resistance, and carbonation resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
D. Karthik, K. Nirmalkumar, R. Priyadharshini
Summary: This experimental study focuses on the characteristics of fresh, mechanical, and durability performance of self-compacting concrete containing fly ash and silica fume. Results showed that the fresh properties of the concrete decreased gradually with increased replacement of SCMs, while mechanical properties were superior to normal concrete up to a certain limit of replacement, and durability properties were enhanced when SCMs were used.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Lili Kan, Fei Wang, Yafeng Zhang, Yanping Wei, Min Wu
Summary: This work investigates the application of red mud as a replacement for fly ash in cementitious composites. The results show that excellent tensile strain capacities can be achieved by using red mud, and the addition of red mud improves both tensile and compressive strengths of the mixes.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Huaguo Chen, Jianjun Yang
Summary: This study confirms the feasibility of using walnut shell ash (WSA) as a supplementary cementitious material and reveals that incorporating no more than 20% WSA can enhance the mechanical properties of cement, leading to the production of sustainable and durable cementitious materials.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Analytical
Yi Xu, Waqas Ahmad, Md Mehedi Hassan, Huanhuan Li, Qin Ouyang, Quansheng Chen
Summary: A novel g-C3N4 nanosheets-assisted upconversion fluorescent aptasensor was developed for Staphylococcus aureus detection using hybridization chain reaction (HCR). The presence of S. aureus activated the HCR system and resulted in a decrease in peroxidase-like activity of g-C3N4 nanosheets and fluorescence recovery proportional to the concentration of S. aureus. The method showed acceptable recoveries in real food samples and was validated by a traditional plate counting method.
ANALYTICA CHIMICA ACTA
(2023)
Letter
Peripheral Vascular Disease
Menhas Ahmad, Waqas Ahmad, Satesh Kumar
Article
Chemistry, Analytical
Baoning Wang, Waqas Ahmad, Quansheng Chen, Qin Ouyang
Summary: A sensitive fluorescence nanosensor was developed for the detection of nitrite in pickled meat products, offering rapid detection and low detection limits.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Review
Chemistry, Multidisciplinary
Waqas Ahmad, Jiang Wu, Qiandong Zhuang, Arup Neogi, Zhiming Wang
Summary: This review presents the latest developments in fabricating broadband photodetectors based on conventional 2D transition metal dichalcogenides (TMDCs). It focuses on the recent progress in group-10 TMDCs in terms of lattice structure and synthesis techniques. The review also discusses the applications of group-10 TMDCs in nanoelectronics and optoelectronics, and provides perspectives for next-generation broadband photodetectors.
Article
Energy & Fuels
Shammas Mushtaq, Sofia Tahir, Arslan Ashfaq, Ruy Sebastian Bonilla, Muhammad Haneef, Rabia Saeed, Waqas Ahmad, Nasir Amin
Summary: This study reports a modeling-guided device optimization process to design highly efficient lead-free n-i-p methyl ammonium tin bromide (MASnBr3) perovskite solar cells. The influence of different parameters on the performance of MASnBr3 devices is thoroughly investigated using numerical simulations. An optimized device structure is proposed, showing the potential of MASnBr3 as a nontoxic perovskite for renewable energy.
Article
Engineering, Environmental
Waqar Ahmad, Muhammad Zubair, Mahmood Ahmed, Muhammad Ahmad, Shoomaila Latif, Abdul Hameed, Qudsia Kanwal, Dure Najaf Iqbal
Summary: The generation of solid waste is increasing due to rapid urbanization and industrialization, and the leachate leakages from landfills pose a threat to human health. This study analyzed the composition of metals and metalloid in soil samples using inductively coupled plasma-optical emission spectrometric studies. The results showed that the levels of metals in the soil were within the permissible limits set by international standards. However, soil contamination with mercury and cadmium posed an ecological risk. Children were found to have the highest exposure to metals through soil, and the cancer risk for chromium was observed to be at the lower edge.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2023)
Article
Chemistry, Applied
Xiaodan Ding, Waqas Ahmad, Jizhong Wu, Yawen Rong, Qin Ouyang, Quansheng Chen
Summary: An ultrasensitive detection strategy for ciprofloxacin (CIP) has been developed using copper ions-induced charge transfer in poly acrylic acid (PAA) functionalized upconversion nanoparticles (UCNPs)/2,2-bipyridine (bipy) system. Copper ions adhere to the surface of PAA-UCNPs, deactivating fluorescence, while bipy controls aggregation. CIP coordinates with the bipy-Cu complex, causing the release of trapped fluorescence. The method shows a good calibration plot (0.05-1000 ng/mL) and a detection limit of 0.13 ng/mL.
Article
Chemistry, Applied
W. Ahmad, E. H. Aljuhani, H. Alwael, E. A. Assirey, H. M. Nassef, M. S. El-Shahawi
Summary: The electrochemical behavior and adsorption properties of food colorant erythrosine b (E127) were investigated and a sensitive analysis method was developed. The energy levels, absorption, and redox potentials of E127 were determined using computational methods. Experimental results validated the proposed redox mechanism and allowed for the detection of E127 in various samples.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Kaffayatullah Khan, Waqas Ahmad, Muhammad Nasir Amin, Ahmed Farouk Deifalla
Summary: This study investigated the effect of eggshell powder on the water-absorption capacity of cement mortar through experimental testing and machine learning modeling. The results showed that the addition of eggshell powder reduced the water absorption capacity of the cement mortar. The ML models constructed exhibited good agreement with the experimental results and can be used to determine the water absorption of cement mortar incorporating eggshell powder.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Oncology
Muhammad Asif Ali, Noohela Khan, Nabeeha Kaleem, Waqas Ahmad, Salem Hussain Alharethi, Bandar Alharbi, Hassan H. Alhassan, Maher M. Al-Enazi, Ahmad Faizal Abdull Razis, Babagana Modu, Daniela Calina, Javad Sharifi-Rad
Summary: Sulforaphane is an isothiocyanate with diverse biomedical applications. It can be extracted from plants, with broccoli sprouts being the richest source. This review paper aims to summarize the mechanisms behind sulforaphane's anticancer potential, concluding that it alters epigenetic and non-epigenetic pathways for cancer protection. Further research is needed for standard dosing.
FRONTIERS IN ONCOLOGY
(2023)
Article
Construction & Building Technology
Nanlan Wang, Zhengjun Xia, Muhammad Nasir Amin, Waqas Ahmad, Kaffayatullah Khan, Fadi Althoey, Hisham Alabduljabbar
Summary: This study investigates the impact of eggshell powder (ESP) on cement mortar exposed to an acidic environment using testing and machine learning modeling. The results show that the addition of ESP can reduce the loss of cement mortar, and the developed ML models are in good agreement with the experimental findings.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Waqas Ahmad, Muhammad Munsif, Habib Ullah, Mohib Ullah, Alhanouf Abdulrahman Alsuwailem, Abdul Khader Jilani Saudagar, Khan Muhammad, Muhammad Sajjad
Summary: The recognition of different activities in sports, especially cricket, has gained attention in recent years. Existing methods in this area often rely on hand-crafted features due to limited availability of public data. In this study, a cricket activities dataset and a deep learning model combining CNN layers and LSTM cells were proposed. The results show that the proposed model outperforms other recurrent neural networks and achieves high accuracy, recall, and F1 score. The code and dataset are publicly available for further research.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Review
Construction & Building Technology
Yuanfeng Lou, Kaffayatullah Khan, Muhammad Nasir Amin, Waqas Ahmad, Ahmed Farouk Deifalla, Ayaz Ahmad
Summary: The study aimed to investigate the use of silica fume, the most prevalent industrial byproduct, as a supplementary cementitious material (SCM). Using the scientometric review technique, the study analyzed the existing literature and collected bibliometric data on silica fume in concrete. The study examined publication sources, co-occurrence of keywords, highly cited authors, and contributing countries, as well as discussed the properties of composites using silica fume as the SCM. It concluded that the addition of silica fume improved material properties and developed prediction models for cementitious composites containing silica fume.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Engineering, Environmental
Waqas Ahmad, Sajid Ullah, Imtiaz Ahmad, Taj Muhammad, Yu Shuang Ren, Muhammad Ilyas
Summary: This article describes the synthesis of graphene oxide (GO) from fish scales and its application for removing organic contaminants from refinery wastewater. Characterization using XRD, FTIR, SEM, and EDX analysis showed that the synthesized GO had a consistent structure. The GO exhibited a rough, porous, and layered morphology similar to two-dimensional sheets of GO. The adsorption process of the adsorbent followed a pseudo-2nd order kinetic model and maintained high efficiency over multiple cycles.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Waqas Ahmad, Hikmat Ullah Khan, Tassawar Iqbal, Saqib Iqbal
Summary: Sentiment analysis is a popular research field in the current era due to its wide range of applications. This study proposes an Attention-based Multi-Channel Gated Recurrent Neural Network (Att-MC-GRU) for aspect extraction and sentiment classification. The method combines word embedding, part of speech tags, and contextual position information, and achieves higher accuracy compared to existing techniques.
