Review
Construction & Building Technology
Jiangjiang Wang, Ziheng Huang, Jun Xia
Summary: Cement manufacture contributes to 5% of global CO2 emissions, and using supplemental cementitious materials is an efficient strategy to reduce cement consumption. Self-compacting concrete relies on high amounts of binder and additives, but the use of powdered bio-composites can help reduce embodied carbon. This paper reviews the physical and chemical properties, as well as heat treatment methods, of five types of bio-composites and their impact on SCC. The study finds that heat treatment can enhance the activity of bio-composites, and adding them improves the mechanical properties of SCC to a certain extent. However, workability is reduced and segregation occurs when certain bio-composites are used. Determining the optimal replacement rates and considering the microstructure of SCC are crucial.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Construction & Building Technology
Jiangjiang Wang, Ziheng Huang, Jun Xia
Summary: This paper systematically reviewed the impacts of five types of PBCs when replacing cement in SCC, finding that heat treatment can enhance the activity of PBCs, but replacing cement will reduce the workability of SCC. Different types of PBCs have varying effects on SCC, and adding PBCs in appropriate amounts can improve the durability of SCC.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Eliana Soldado, Ana Antunes, Hugo Costa, Ricardo do Carmo, Eduardo Julio
Summary: The study aims at optimizing the properties of concrete by partially replacing cement and aggregates with alternative materials. Results show that mixtures with fly ash exhibit higher mechanical performance and mixtures with fly ash or pozzolans reveal much higher durability results than the full Portland cement-based mixtures.
Article
Chemistry, Physical
Meriem Guessoum, Fouad Boukhelf, Fouzia Khadraoui
Summary: This study investigates the use of self-compacting concretes (SCCs) containing recycled aggregates (RAs) and limestone filler as partial replacements for natural aggregates (NAs) and cement, respectively. Four mix designs were developed and characterized in terms of fresh and hardened state properties such as slump, compressive strength, and durability. The results show that the incorporation of recycled aggregates affects the slump flow of concrete, but not the compressive strength. The behavior of the concrete during freeze-thaw cycles is modified by the presence of recycled aggregates, and the carbonation depth is influenced by the rate of aggregate replacement.
Article
Construction & Building Technology
Hasan Jalilifar, Fathollah Sajedi
Summary: This study investigated the microstructure of 100% recycled concrete, finding that the addition of micro-silica significantly reduced pores and compressed the interfacial transition zone, making its microstructure similar to that of conventional concrete. On the other hand, the addition of fly ash and natural zeolite resulted in relatively porous and discontinuous microstructures in the concrete. Additionally, besides the poor mechanical properties, excessive discontinuities were observed in the interfacial transition zones of these concretes.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Hongzhi Zhang, Huaqiang Yuan, Zhi Ge, Jiajie Wu, Chen Fang, Erik Schlangen, Branko Savija
Summary: The study focuses on preparing self-compacting concrete with recycled fine clay brick aggregates, showing that the fresh and hardened properties of SCC still meet the standards despite some decrease in certain properties with increasing RFCBA content. RFCBA can act as an additional water source for internal curing and contribute to a significant reduction in autogenous shrinkage in SCC.
MATERIALS AND STRUCTURES
(2021)
Article
Green & Sustainable Science & Technology
Tehmina Ayub, Wajeeha Mahmood, Asad-ur-Rehman Khan
Summary: This study compares the rheological, mechanical, and durability properties of self-compacting concrete (SCC) and self-compacting geopolymer concrete (SCGC) and finds that the performance of SCGC is inferior to SCC when recycled concrete aggregates (RCA) are used. SCC exhibits better mechanical and durability properties compared to SCGC.
Article
Construction & Building Technology
Ran Bir Singh, Bhupinder Singh
Summary: The study investigated the rheological properties of self-compacting concrete (SCC) and self-compacting recycled aggregate concrete (SCRAC) using a coaxial concrete rheometer. It found that the degree of shear thinning in both SCC and SCRAC was inversely proportional to the fly ash dosage, and shear-thinning transitioned to shear-thickening as the water-cementitious material ratio decreased. Furthermore, replacing natural coarse aggregates with coarse recycled aggregates in SCRAC further decreased the degree of shear thinning. The selected rheological models showed similar predictive efficacies and useful correlations were proposed between them.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Chemistry, Physical
Waiching Tang, Mehrnoush Khavarian, Ali Yousefi, Bill Landenberger, Hongzhi Cui
Summary: This research examines the impact of mechanical screening on the properties of recycled coarse aggregates (RA) and resulting self-compacting concrete (SCC). The results show that screening reduces water absorption and improves workability and compressive strength of SCC.
Review
Construction & Building Technology
Marija Nedeljkovic, Jeanette Visser, Branko Savija, Siska Valcke, Erik Schlangen
Summary: This paper discusses the state-of-the-art of fine recycled concrete aggregates (fRCA), emphasizing the need for further research to introduce guidelines and tools for widespread application in new concrete, while highlighting the key physicochemical properties' impact on concrete performance.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Rahul Singh, Dheeresh Nayak, Arunabh Pandey, Rajesh Kumar, Veerendra Kumar
Summary: The study found that the performance of recycled concrete was mostly inferior to conventional concrete, but the performance gap would reduce with an increase in curing age. FRCA is more compatible with CNA at 30% FNA replacement and with CRCA at 60% and 100% FNA replacement.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Nicoletta Russo, Federica Lollini
Summary: The carbonation treatment is an efficient method to improve the quality of recycled concrete aggregate and enhance the mechanical properties of concrete. However, research on the durability properties of carbonated RCA concrete is limited. The concrete made with carbonated RCA shows improvements in compressive strength, electrical resistivity, water absorption and sorptivity, as well as a significant decrease in chloride diffusion coefficient compared to concrete made with untreated RCA. However, the mechanical and durability performances of the carbonated RCA concrete are still lower than those of concrete made with natural aggregate.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Abdeldjalil Khelafi, Nouria Kaid, Rabah Soltani, Djamel Elddine Kerdal, Hamid Khelafi
Summary: This research work focused on the viability and valuation of recycled concrete sand aggregates (RCSAs) in the preparation of mortars. An alternative recycling process was proposed to improve the physical and mechanical properties of RCSAs-based mortars and promote efficient use of demolition concrete waste. The experimental results showed improvement and good interaction between the cement matrix and sand in RCSAs-based mortars, highlighting the effectiveness of the alternative recycling method in enhancing composition quality and mechanical performance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Justyna Jaskowska-Lemanska, Milena Kucharska, Jakub Matuszak, Pawel Nowak, Wojciech Lukaszczyk
Summary: The study found that with an increase in PET content, the flow properties and hardened parameters of the concrete decreased, especially in the case where 20% of the PET was replaced. However, replacing 5% of fine aggregate with PET did not significantly alter the concrete parameters, making it potentially an attractive alternative.
Article
Construction & Building Technology
Fazel Azarhomayun, Mohammad Haji, Mohammad Shekarchi, Mahdi Kioumarsi
Summary: Self-compacting concrete (SCC) is a highly flowable concrete that can fill complex formwork without the need for vibration. However, its high consistency can lead to various forms of instability, such as separation, bleeding, blockage, and settling. Understanding the types of instability, the factors that cause it, and the methods for measuring stability is crucial in preventing instability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Zine El-Abidine Laidani, Benchaa Benabed, Rajab Abousnina, M. Kamal Gueddouda, El-Hadj Kadri
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Younes Ouldkhaoua, Benchaa Benabed, Rajab Abousnina, El-Hadj Kadri, Jamal Khatib
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Construction & Building Technology
Salem Merabti, Said Kenai, Rafik Belarbi, Jamal Khatib
Summary: This paper investigates the mechanical and thermal properties of cement composites with waste cork under different curing conditions, and also studies the effect of including granulated blast furnace slag on these composites. The results show that the strength of cork cement composite is adequate and meets the standards requirements for heat insulation elements.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Hasan Biricik, Mehmet Serkan Kirgiz, Andre Gustavo de Sousa Galdino, Said Kenai, Jahangir Mirza, John Kinuthia, Ahmed Ashteyat, Anwar Khitab, Jamal Khatib
Summary: Increasing water curing temperature significantly reduces capillary water sorption; capillarity coefficient remains stable across different Blaine fineness of GGBFS; variation in Blaine fineness of GGBFS affects the unit weight and water sorption properties of GPMs.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Mehmet Serkan Kirgiz, Andre Gustavo de Sousa Galdino, John Kinuthia, Anwar Khitab, Muhammad Irfan Ul Hassan, Jamal Khatib, Hesham El Naggar, Carlos Thomas, Jahangir Mirza, Said Kenai, Tuan Anh Nguyen, Moncef Nehdi, Muhammad Syarif, Ahmed Ashteyat, Ravindran Gobinath, Ahmed Soliman, Trinity A. Tagbor, Manoj A. Kumbhalkar, Naraindas Bheel, Chandra Sekhar Tiwary
Summary: The use of carbon flake and colloid carbon flake has shown significant progress in improving the physical and mechanical properties of construction materials, leading to accelerated setting time of plaster and increased compressive stress of grouts. This novel material has potential applications in the construction industry.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Muhammad Syarif, Mehmet Serkan Kirgiz, Andre Gustavo de Sousa Galdino, M. Hesham El Naggar, Jahangir Mirza, Jamal Khatib, Said Kenai, Moncef Nehdi, John Kinuthia, Anwar Khitab, Carlos Thomas, Ravindran Gobinath, Muhammad Irfan Ul Hassan, Yan Kai Wu, Ahmed Ashteyat, Ahmed Soliman, Khairunisa Muthusamy, Thaarrini Janardhanan, Trinity Ama Tagbor, Tuan Anh Nguyen, Naraindas Bheel, Manoj A. Kumbhalkar, Chandra Sekhar Tiwary
Summary: The study showed that NC cement has the potential to be an alternative for producing greener concrete, with chemical composition and physical properties comparable to traditional Portland cement.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Construction & Building Technology
Sihem Hammat, Belkacem Menadi, Said Kenai, Carlos Thomas, Mehmet Serkan Kirgiz, Andre Gustavo de Sousa Galdino
Summary: Mineral admixtures such as natural pozzolana can impact the rheological properties, compressive strength, shrinkage characteristics, and water absorption of self-compacting mortar. The fineness and content of natural pozzolana play a crucial role in these effects, with higher replacement levels and finer particles affecting the performance of the mortar.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Boukhelkhal Aboubakeur, Kenai Said
Summary: This study investigates the effects of using marble powder as a substitution for ordinary Portland cement on self-compacting concrete. The results show that adding marble powder can improve the fresh properties of concrete, but it may decrease the compressive strength. An appropriate level of marble powder substitution can produce eco-efficient self-compacting concrete with high fluidity and acceptable strength.
FRATTURA ED INTEGRITA STRUTTURALE-FRACTURE AND STRUCTURAL INTEGRITY
(2022)
Article
Construction & Building Technology
Samir Benimam, Mohamed Bentchikou, Farid Debieb, Said Kenai, Mohamed Guendouz
Summary: The study found that using plastic waste corrugated fibers can improve the tensile strength of mortar, while the water absorption and density rate are lower than that of ordinary mortar.
ADVANCES IN CONCRETE CONSTRUCTION
(2021)
Article
Engineering, Civil
Siham Hammat, Belkacem Menadi, Said Kenai, Jamal Khatib, El-Hadj Kadri
Summary: The study investigated the performance of Self-Compacting Mortars (SCM) containing ground granulated blast furnace Slag (S) of varying fineness. Results indicated that higher slag content and fineness reduced plastic viscosity and yield stress, while increasing shrinkage properties.
CIVIL ENGINEERING JOURNAL-TEHRAN
(2021)
Review
Construction & Building Technology
Jad Bawab, Jamal Khatib, Said Kenai, Mohammed Sonebi
Summary: This paper reviews the use of MSWI-BA as aggregates in cementitious materials, highlighting its differences from natural aggregates and treatment methods. Although replacing natural aggregates with MSWI-BA in cementitious materials decreases workability, density, and strength, they can be treated to ensure suitable quality for construction purposes. Further research, especially on durability, is required before MSWI-BA can be efficiently used in the production of sustainable cementitious materials.
Article
Engineering, Civil
A. Jahami, Y. Temsah, J. Khatib, O. Baalbaki, S. Kenai
Summary: This study numerically investigated the effect of using CFRP as a strengthening technique for RC beams subjected to blast loading, including flexural and shear strengthening. The results showed that using CFRP on the bottom tensile face of RC beams helps absorb blast energy and reduces tensile strain in beam reinforcements.
MAGAZINE OF CIVIL ENGINEERING
(2021)
Article
Engineering, Civil
Mahmoud Serraye, Said Kenai, Bakhta Boukhatem
Summary: Self-compacting concrete (SCC) is a modern type of concrete with high workability and cement replacement materials. This study successfully developed an artificial neural network (ANN) model to predict the compressive strength of SCC with silica fume, achieving high accuracy and practicality.
CIVIL ENGINEERING JOURNAL-TEHRAN
(2021)
Article
Engineering, Multidisciplinary
El-Hadj Meziane, Said Kenai, Bensaid Boulekbache, Abdelkader Bougara
JOURNAL OF MATERIALS AND ENGINEERING STRUCTURES
(2020)
Article
Construction & Building Technology
Debbih Amina, Kenai Said, Kaci Abdelhak, Kadri El Hadj, Mehmet Serkan Kirgiz
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)