Article
Construction & Building Technology
Sergio Roberto da Silva, Jorge de Brito, Jairo Jose de Oliveira Andrade
Summary: The use of construction and demolition waste (CDW) as recycled aggregate (RA) and fly ash (FA) in cementitious materials can improve the sustainability of concrete. However, RA has lower mechanical strength compared to natural aggregate (NA) and FA delays early age strength development. Adding hydrated lime (HL) can increase the strength of concrete with FA at an early age. Rating: 8/10.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
J. Sainz-Aja, I. Carrascal, J. Polanco, A. Cimentada, C. Thomas, J. Brito
Summary: Due to the high CO2 emissions in the construction sector, researchers are exploring ways to make constructions more environmentally friendly. Using recycled construction waste as aggregates for concrete is a popular research approach. While the use of coarse recycled aggregates has been validated, more research is needed on the use of fine recycled aggregates. This study isolated the mortar made with fine recycled aggregates to analyze the impact of drying-wetting cycles on concrete mixes with recycled aggregates only. Testing was conducted on different types of fine aggregates exposed to various environments to assess their mechanical, visual, and microstructural properties.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Peem Nuaklong, Ampol Wongsa, Kornkanok Boonserm, Chanchai Ngohpok, Pitcha Jongvivatsakul, Vanchai Sata, Piti Sukontasukkul, Prinya Chindaprasirt
Summary: This study used micro carbon fiber (CF) to enhance the mechanical properties of fly ash geopolymer containing fine recycled concrete aggregate (RCA). The results showed that CF improved the compressive and splitting tensile strengths of geopolymer mortar, with best results obtained at 0.2% CF in mixtures containing 100% RCA. Additionally, the flexural strength and surface abrasion resistance were significantly improved with the use of 50% RCA. Incorporating CF allows for increased use of recycled fine aggregate without the need for natural fine aggregate.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Andres Barragan-Ramos, Camilo Rios-Fresneda, Juan Lizarazo-Marriaga, Nicole Hernandez-Romero
Summary: This research investigated the potential alkali silica reaction of recycled aggregates in concrete and its effects on chloride transport properties and corrosion risk. The study found that high contents of recycled aggregates did not increase corrosion risk, and a comparable risk to conventional concrete was observed when incorporating fly ash.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Ronnakrit Kunthawatwong, Lattana Sylisomchanh, Saengsuree Pangdaeng, Ampol Wongsa, Vanchai Sata, Piti Sukontasukkul, Prinya Chindaprasirt
Summary: This study examined the use of recycled PET waste as a fine aggregate in fly ash geopolymer mortar. The mechanical properties of the mortar deteriorated with increasing PET waste content, but the ratio of flexural strength to compressive strength improved. Additionally, the density and thermal conductivity of the mortar decreased significantly with increasing PET content.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Miren Etxeberria
Summary: This study evaluated the eco-efficiency of concrete made with uncarbonated recycled concrete aggregates and fly ash, finding that a combination of 50% uncarbonated RCA with FA significantly enhanced the properties and eco-efficiency of hardened concrete. The concrete made of 25% FA plus RCA was considered the most eco-efficient based on various tests.
Article
Construction & Building Technology
Sakchai Naenudon, Ampol Wongsa, Jindarat Ekprasert, Vanchai Sata, Prinya Chindaprasirt
Summary: In this study, the use of recycled waste ceramic electrical insulator as coarse aggregate in geopolymer concrete was investigated. The results showed that the properties of the concrete were significantly improved with the use of the recycled aggregate. The findings suggest that the recycled waste ceramic electrical insulator can be utilized as a sustainable aggregate to produce geopolymer concrete with high strength and low thermal conductivity.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Sushree Sunayana, Sudhirkumar Barai
Summary: This paper presents experimental investigation of the microstructure of partial cement substituted fly ash incorporated recycled aggregate concrete (FARAC). Different testing techniques were adopted to examine the effects of various parameters on the concrete properties. The study found that while FARAC showed some advantages in microstructure, it did not directly translate into higher compressive strength. The reduction of heterogeneities in the new ITZ and thickness of the old ITZ, as well as the impact of microcracks passing through the bulk paste, were observed.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Green & Sustainable Science & Technology
S. N. Minnu, A. Bahurudeen, G. Athira
Summary: The use of industrial by-products as supplementary cementitious materials in place of conventional cements is a sustainable choice, though their industrial acceptance is lower compared to established materials; the study found that bagasse ash blended concrete shows better strength gain and significantly enhanced resistance against chloride and water permeability compared to fly ash and slag blended concrete.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Himanshu Sharma, Sanjay Kumar Sharma, Deepankar Kumar Ashish, Suman Kumar Adhikary, Gulab Singh
Summary: Recycling is crucial in sustainable construction, and utilizing recycled aggregate (RA) from construction and demolition waste is a promising solution. In this study, three biomineralization treatment techniques with different cell concentrations of Bacillus sphaericus were applied to treat coarse recycled concrete aggregate (RCA). The treated RCA showed improvements in water absorption, strength, and other properties, and the concrete made with treated RCA performed well in various aspects.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Hossein Sasanipour, Farhad Aslani, Javad Taherinezhad
Summary: The study found that using pretreated recycled aggregates significantly improved durability properties of concrete mixes, especially in terms of chloride ion penetration and electrical resistance. SEM images showed that pretreated RCAs had a significant impact on improving the interface transition zone, resulting in lower permeability and higher electrical resistance of specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Aliakbar Gholampour, Junai Zheng, Togay Ozbakkaloglu
Summary: The utilization of various replacement materials such as FA, GGBS, FS and RFA in concrete production has shown potential in reducing environmental impact and improving concrete strength. Different combinations of replacement materials affect concrete properties differently, with some maintaining elasticity and decreasing water absorption.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Carla Mabel Medeiros de Albuquerque Silva, Mara Monaliza Linhares Pereira, Valdirene Maria Silva Capuzzo, Jorge de Brito
Summary: This study investigates techniques to improve the quality of recycled aggregates, such as removing mortar particles and surface modification. The results show that mechanical grinding and a two-stage mixing method can improve the properties of the recycled aggregates. The test results indicate that these methods enhance the compressive strength and tensile strength of concrete. Therefore, the use of these treatments can improve the mechanical properties and durability of concrete produced by recycled aggregates.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Victor Alberto Franco-Lujan, Jose Manuel Mendoza-Rangel, Victor Guillermo Jimenez-Quero, Pedro Montes-Garcia
Summary: The experimental program revealed that ternary concretes containing untreated sugarcane bagasse ash (UtSCBA) exhibit the highest chloride-binding capacity. Chemical reactions between chlorides and the Afm and Aft phases in all concretes were observed, forming Friedel's salt.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Materials Science, Multidisciplinary
Wanhui Feng, Yunchao Tang, Yunqi Zhang, Changhui Qi, Liangyi Ma, Lijuan Li
Summary: This study investigates the effects of using nano-silica and fly ash as supplementary cementitious materials in recycled aggregate concrete. It is found that this modification method can improve the mechanical properties of the concrete in both early and later stages.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
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)
