Article
Construction & Building Technology
Yuepeng Huang, Yong Jiao, Wenying Fang, Guangshao Yang, Rui Yang, Rui Yu, Rengui Xiao, Zhiyang Wang, Zhonghe Shui, Guiming Xie
Summary: In this study, spent fluidized catalytic cracking catalysts (SC) were incorporated into high-density cement-based materials (HDCM) at different concentrations, and their mechanical properties, hydration kinetics, durability, and environmental characteristics were evaluated. The results showed that HDCM containing SC exhibited improved compressive strength and long-term volumetric stability, and had a good ability to immobilize heavy metal ions. The leaching concentrations of Ni and V were significantly reduced, indicating a high immobilization rate.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Samile R. C. Matos, Paulo R. de Matos, Jose S. Andrade Neto, Carlos E. M. Campos, Ana Paula Kirchheim, Jardel P. Gonsalves
Summary: This research evaluated the feasibility of using spent FCC catalyst as raw material for ye'elimite-containing cements (YCC) production. The results showed that the cement with spent FCC catalyst had higher reaction rates and more hydrated phases formed during the early hydration process.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Environmental
Mouna Hanabe Muddanna, Saroj Sundar Baral
Summary: In this study, Acidothiobacillus ferrooxidans (A. ferrooxidans) was used for leaching rare earth elements (REEs) from SFCCC, showing that the growth of A. ferrooxidans was inhibited at higher pulp densities, and different leaching results were obtained at different pulp densities. High efficiency leaching of La and Ce was achieved through bioleaching, which is of significant economic importance.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Civil
Mauricio Arreola Sanchez, Hugo Luis Chavez Garcia, Wilfrido Martinez Molina, Elia Mercedes Alonso Guzman, Andres Antonio Torres Acosta, Jose Maria Ponce Ortega
Summary: This study explores the feasibility of using high-temperature pozzolans and industrial waste to improve the performance and durability of mortars, reducing CO2 emissions by partially replacing cement. Mortars made with metakaolin showed better mechanical properties compared to control mixtures, indicating a potential solution to reducing environmental impact.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2021)
Article
Chemistry, Physical
Szymon Skibicki, Patrycja Jakubowska, Maria Kaszynska, Daniel Sibera, Krzysztof Cendrowski, Marcin Hoffmann
Summary: This study investigates the effect of replacing natural sand with spent garnet in 3D-printed mortar at early ages. The results show that increasing spent garnet content leads to a decrease in green strength and Young's Modulus. The recommended maximum replacement rate is 50%.
Article
Construction & Building Technology
Dongdong Ma, Wenpu Zhang, Xinpeng Wang, Rongrong Zhang, Zhiwei Zhou, Yi Yang, Yuhang Shi
Summary: Due to increased human activities, construction and maintenance projects in cold regions are facing issues related to cement soil materials. This study systematically investigates the effects of curing temperature and age on the strength and microstructure of cement clay modified by metakaolin (CCM) and cement clay modified by metakaolin and basalt fiber (CCMB). The results show that negative curing temperature increases strain and reduces the decline rate of stress-strain curves. Positive curing temperature and age contribute to increased strength, while the incorporation of basalt fiber has opposite effects on the properties of CCMB specimens at different curing temperatures. Negative curing temperature also inhibits cement hydration and disrupts the bond between basalt fiber and matrix.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Jin-Ho Bae, Seonhyeok Kim, Issam T. Amr, Joonho Seo, Daeik Jang, Rami Bamagain, Bandar A. Fadhel, Emad Abu-Aisheh, H. K. Lee
Summary: This study investigated the evaluation of physicochemical properties and environmental impact of Portland cement/metakaolin bricks exposed to humid or CO2 curing condition. The results showed that the CO2 uptake of the CO2-cured paste samples increased with the incorporation of metakaolin. Carbon footprint assessment revealed that the final CO2 emission of the bricks and the corresponding environmental impact can be reduced as the metakaolin dosage is increased.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Tiago M. S. Agra, Victor M. E. Lima, Priscilla E. A. Basto, Antonio A. Melo Neto
Summary: This study evaluates the potential of water treatment sludge ash (WTSA) as a high-reactivity pozzolan and analyzes the consumption of calcium hydroxide in the hydration process. The results show that ash calcined at 600 degrees C (SA600) achieved higher compressive strength values and exhibited higher consumption of calcium hydroxide in hydrated lime pastes. Therefore, WTSA has the potential to be used as a high-reactivity pozzolan.
APPLIED CLAY SCIENCE
(2023)
Article
Engineering, Chemical
Xiaohao Jia, Peiheng Yang, Yanfang Fan, Chengxiu Wang
Summary: The buildup of solid waste and global warming pose major challenges, but synthesizing solid amine materials can address CO2 emissions and utilize solid waste effectively.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Biochemistry & Molecular Biology
Haihui Fu, Yan Chen, Tingting Liu, Xuemei Zhu, Yufei Yang, Haitao Song
Summary: This study examines FCC spent catalysts in China and finds that they do not exhibit characteristics of flammability, corrosiveness, reactivity, or infectivity. The main hazardous characteristic identified is toxicity, specifically related to leaching of heavy metal pollutants such as nickel, copper, lead, and zinc. The study suggests excluding waste catalysts from catalytic cracking units without antimony-based passivating agent from the National Hazardous Waste List.
Article
Construction & Building Technology
Sarah Emily L. Gudia, Alchris Woo Go, Marnie B. Giduquio, Roxanne G. Juanir, Janice B. Jamora, Chintya Gunarto, Ian Dominic F. Tabanag
Summary: The quality of sugarcane bagasse ash (SCBA) varies across different areas, affecting its performance as a cement replacement. This research studied the potential of locally available SCBA in the Philippines as a partial cement replacement and determined the appropriate formulations for mortar and concrete production. Different mixtures with varying SCBA-to-binder and water-to-binder ratios were formulated to assess their impact on consistency, setting time, density, and compressive strength. Regression analysis was used to predict water requirements for both paste and mortar. The results showed that increasing SCBA-to-binder ratio led to higher water demand and longer setting time, but also improved the density and compressive strength of mortar up to a certain point.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Ariel R. Villca, Lourdes Soriano, Alba Font, Mauro M. Tashima, Jose Monzo, Maria Victoria Borrachero, Jordi Paya
Summary: The use of lime in construction is limited by low initial strength, which can be improved by adding pozzolanic materials. Alkali-activated materials and geopolymers are high-performance materials that can be produced with residual waste. The study showed that a lime/pozzolan/geopolymer mixture exhibited superior compressive strength compared to traditional lime/pozzolan mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Environmental Sciences
Hong-Zhe Zhang, Shi-Ping Fang, Zheng-Wei Liu, Xiang-Qian Zhang
Summary: This study prepared geopolymers with excellent immobilization capability of heavy metals using spent fluid catalytic cracking (sFCC) catalyst as raw material. The leaching toxicity of Ni was reduced to below 0.01 ppm under optimal conditions, forming a new aluminosilicate zoisite phase with three-dimensional network structure.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2021)
Article
Construction & Building Technology
Yalin Liu, Ya Wei, Lei Ma, Linbing Wang
Summary: Ultra-high performance concrete (UHPC) has excellent mechanical properties and durability, making it a promising material for bridge deck overlay or structural member repair. However, the large autogenous shrinkage of UHPC can hinder its application. This study develops a novel internal curing agent, calcined bauxite (CB) aggregate, to effectively reduce the autogenous shrinkage of UHPC and improve its mechanical properties. The results show that IC UHPC with CB aggregate exhibits smaller crack widths and delayed onset of cracking compared to normal UHPC, and the use of fibers further enhances its crack resistance. Normal UHPC overlay experiences more delamination and curling than IC UHPC overlay, and early-age drying has a detrimental effect on the UHPC overlay. Reinforcement in the UHPC layer proves to be effective in reducing shrinkage strain.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Civil
Aso Abdalla, Ahmed Salih Mohammed
Summary: In this study, mathematical, soft computing, and machine learning modeling tools were used to develop a dependable model for forecasting the compressive strength of cement mortar modified with metakaolin (MK) additive and predicting the effect of MK and a maximum diameter of the fine aggregate (MDA) on the compressive strength of the mortar. The performance of the proposed models was assessed using various evaluation tools, and the multivariate regression spline (MARS) model showed the best performance.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Karina H. Arcolezi, Rodrigo G. da Silva, Lourdes Soriano, Maria V. Borrachero, Jose Monzo, Jordi Paya, Mauro M. Tashima, Jorge Luis Akasaki
Summary: The granulometric distribution of aggregates significantly affects the mechanical and hydraulic properties of pervious concrete. Using single-sized aggregates increases unit weight and improves mechanical properties. This study utilized the maximum density methodology and three narrow-sized basaltic aggregates to enhance the mechanical strength of pervious concrete. Results showed that packed aggregate samples had an 81.2% increase in compressive strength and an energy support impact 50% higher than the reference sample after 28 days of curing. While densification increased, the greatest reduction in porosity was 24.3%. The lowest infiltration rate was 0.43 cm/s, which is satisfactory according to literature. These findings suggest that aggregates packing methodology is effective in producing optimized and sustainable pervious concretes.
Article
Construction & Building Technology
P. Lorca, L. Soriano, M. V. Borrachero, J. Monzo, M. M. Tashima, J. Paya
Summary: This study investigated the effects of fly ash substitution for Portland cement and addition of hydrated lime on the properties of mortar. The results showed that the addition of hydrated lime improved the strength of the mortar and reduced the carbonation rate.
MATERIALES DE CONSTRUCCION
(2023)
Article
Chemistry, Physical
Noelia Bouzon, Alba Font, Maria Victoria Borrachero, Lourdes Soriano, Jose Monzo, Mauro M. M. Tashima, Jordi Paya
Summary: This research investigates the use of rice husk ash as an alternative silica source for alkaline activators in geopolymers. Different methods were compared, and it was found that the thermal bath treatment at 65°C yielded the best mechanical strength results in mortars.
Article
Chemistry, Physical
Michelle S. Rodrigues, Jordi Paya, Lourdes Soriano, Jose Monzo, Maria Victoria Borrachero, Holmer Savastano, Antonio L. Beraldo
Summary: This study aims to evaluate the reactivity of sugarcane straw ashes (SCSA) burned under controlled conditions and analyze their application in blended cement and hydrated lime pastes. The results show that sugarcane straw ashes burned at specific temperatures can partially replace inorganic binders and have a positive impact on hydrated lime and cement pastes.
Article
Construction & Building Technology
Diego J. De Souza, Leandro F. M. Sanchez, Juarez Hoppe Filho, Marcelo H. F. Medeiros
Summary: This paper evaluates the physical and chemical properties of mortar mixtures with different binders and exposed to different sulphate solutions. A theoretical approach to describe the susceptibility of cementitious mixtures against sulphate attack is proposed. The results show that the amount of portlandite and the potential of ettringite formation are well correlated with the expansion and damage caused by sulphate attack.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Yu Chen, Hossein Rahmani, Erik Schlangen, Og uzhan Copurog
Summary: This study presents a method to accelerate the production of limestone-calcined clay-based cementitious materials using Ca(NO3)2 solution in 3D printing, and investigates the effects of adding Ca(NO3)2 solution on the material's properties. The results show that adding Ca(NO3)2 solution can improve buildability, accelerate initial setting, and increase compressive strength.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jing Xu, Xianzhi Wang, Wu Yao, Qing Chen, Hehua Zhu, Surendra P. Shah
Summary: Concrete cracks in marine engineering are caused by the hostile seawater environment, leading to serious deterioration of infrastructures. Microbial induced carbonate precipitation (MICP) is an effective and environmentally friendly approach for self-healing of concrete cracks. However, the formation and structure of MICP products for crack healing in seawater are still unclear, which hinders the application of MICP in marine structures.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhenbo Wang, Peng Sun, Yurun Fan, Yudong Han, Yudong Hu
Summary: This study investigates the potential use of engineered cementitious composites (ECCs) with strain-hardening and self-healing characteristics as a cover material in wet coral sand exposure. The results show that ECCs can effectively close cracks, reduce water permeability, and restore the load-carrying capacity of structures. Additionally, lower strain levels are associated with decreased rebar corrosion.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhengxian Yang, Xiaoli Xiong, Kang Li, Bruno Briseghella, Giuseppe Carlo Marano, Shanghong Chen
Summary: This study investigates the long-term volume stability and strength development of engineered cementitious composites (ECC) containing high-volume steel slag (SS). It is found that the strength of ECC with SS starts to decline after 90 days, while the decline is more significant compared to the matrix. The expansion of SS reduces the fracture toughness of the matrix, leading to an increase in toughness and ductility of the ECC. The introduction of ground granulated blast furnace slag (GGBFS) and PVA fibers can reduce the volume expansion and strength loss caused by SS expansion.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Bin Xi, Zhewen Huang, Salam Al-Obaidi, Liberato Ferrara
Summary: This study investigates the self-healing capabilities of Ultra-High Performance Concrete (UHPC) under the combined influence of mechanical and environmental factors. The results reveal that UHPC with narrow cracks exhibits a higher degree of self-healing, especially when exposed to tap water. Furthermore, prolonged exposure mitigates the inhibitory effect of aggressive ions on self-healing.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhichao Xu, Huayang Sun, Yanlin Huo, Minjie Jia, Zhitao Chen, Yingzi Yang
Summary: In this study, MXene was used to modify the surface of polyethylene fiber, improving the interfacial properties and tensile properties of strain hardening cementitious composites. The MXene-coated fiber showed increased tensile stress and strain, reduced crack width and spacing, and enhanced frictional bond strength between the fiber and matrix.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Bao Lu, Yeqiang Zhou, Lei Jiang, Zhensen Liu, Guihua Hou
Summary: This study investigated the leaching rate of Ca2+ from magnesium slag (MS) and developed a leaching-carbonation method to convert MS into high-purity vaterite and supplementary cementitious materials. The wet carbonation process with glycine as a crystal modifier successfully produced spherical vaterite with high purity and surface area. The leachate solid residue (LSR) obtained from the leaching process of MS showed a smaller size destruction and higher surface area compared to Portland cement, leading to accelerated hydration process and improved compressive strength and pore structure development. This work provides a novel treatment method for MS and enables its high value-added utilization.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Gustavo Henrique Nalon, Jose Carlos Lopes Ribeiro, Leonardo Goncalves Pedroti, Roberto Marcio da Silva, Eduardo Nery Duarte de Araujo, Gustavo Emilio Soares de Lima
Summary: The mechanical behavior of mortar joints is crucial for masonry's structural performance. This study investigated the effects of different lime/cement ratios and carbon black nanoparticles content on the properties of mortars. The results showed that increasing lime content decreased mortar strength but increased self-sensing properties at the end of the percolation zone.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Yifei Wang, Lei Lei, Caijun Shi
Summary: The effects of DEIPA and EDIPA at dosages of 0.02% and 0.05% on the hydration and strength development of cement-fly ash-limestone ternary blend were investigated. It was found that both dosages of DEIPA and EDIPA promote the chemical effect of limestone and the hydration of aluminates from cement and fly ash. The hydration of silicates was accelerated by 0.02% of DEIPA or EDIPA but delayed by 0.05% due to excessive aluminates hydration. DEIPA and EDIPA also refine the pore structure and increase compressive strength of the blend mortar.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Du Pan, Ditao Niu, Zongjin Li
Summary: A thick-walled cylinder model was developed in this study to analyze the cracking behavior of seawater sea-sand concrete (SSC) cover. Damage variables were introduced to determine the extent of damage for each cracked ring, and a predictive model for the cracking time of SSC cover was established. The accuracy of the model was verified using the Digital Image Correlation (DIC) technique.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jiangyu Wu, Hong S. Wong, Hao Zhang, Qian Yin, Hongwen Jing, Dan Ma
Summary: This study explores a method of strengthening cemented rockfill by using well-graded gangue and partially replacing Portland cement with fly ash and a premixed low-alkalinity activator. The research investigated the effects of activator dosage and curing time on the mechanical properties, composition, and microstructure of cemented rockfill. Results show improved performance with low cement content and the use of a low-cost activator. The addition of premixed activator to fly ash enhanced the formation of specific minerals and caused densification of the microstructure. The study reveals an effective and low-cost method for recycling mining wastes and reducing cement.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Juntao Dang, Xiaosong Tang, Jianzhuang Xiao, Aihong Han
Summary: This study proposes a solution to improve the fresh stability and thermal insulation of alkali-activated foamed concrete by adding recycled brick powder. The study investigates the effects of activator modulus and Na2O concentration on the properties of alkali-activated foamed concrete with different bases. The presence of alkaline activator negatively affects the foamability and foam stability, but adjusting the activator concentration can achieve shorter initial setting time and higher fluidity loss. In addition, the increased activator concentration resulted in changes in the pore structure of the foamed concrete.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jiandong Zuo, Bo Wu, Biqin Dong, Feng Xing, Jun Ma, Guanqi Wei
Summary: Nitrite ion intercalated Ca-Al and Mg-Al layered double hydroxides (LDHs) were successfully synthesized using two modified methods. The Ca-Al LDH synthesized by hydrothermal method (H-C-LDH) exhibited the best properties. The intercalated LDHs improved the mechanical properties, chloride penetration resistance, and permeability resistance of cement mortars without affecting the fluidity. Additionally, the intercalated LDHs provided better corrosion resistance.
CEMENT & CONCRETE COMPOSITES
(2024)
Review
Construction & Building Technology
Jingbin Yang, Zhenping Sun, Nele De Belie, Didier Snoeck
Summary: This review paper provides an overview of internal curing mechanism, common internal curing agents, and the most promising agent-superabsorbent polymers in alkali-activated materials (AAM) systems. The introduction of voids by internal curing agents typically has a negative impact on mechanical properties, but continuous water release during internal curing counteracts this effect by promoting hydration. While the effect of internal curing in reducing autogenous shrinkage of AAM systems has been well-established, the impact on drying shrinkage varies widely in different studies.
CEMENT & CONCRETE COMPOSITES
(2024)