Article
Construction & Building Technology
Chandra Sekhar Reddy Indukuri, Ruben Nerella
Summary: This study aimed to evaluate the transport properties of a cement composite incorporated with graphene oxide (GO). The experimental results demonstrated that the addition of GO could significantly decrease water absorption, chloride migration coefficient, and chloride penetration depth in the cement composite specimens, while improving mechanical properties such as flexural strength and compressive strength. SEM analysis also showed that GO-cement composite specimens had a pore-filled structure. Overall, the incorporation of graphene oxide nano material effectively improved the transport properties of the cement composite.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Construction & Building Technology
Xiaotao Zhang, Shun Zhou, Han Zhou, Dongxu Li
Summary: This study discusses the effect of incorporating graphene oxide (GO) and KH550 modified graphene oxide (MGO) on the microstructure, mechanical properties, and hydration process of cement-based composites. The results show that the surface of MGO is grafted with functional groups, which improves its dispersibility in cement paste. Furthermore, the addition of MGO promotes cement hydration even more than GO, resulting in a more uniform microstructure. The inclusion of MGO also refines the crystal size of hydrated calcium hydroxide (CH), reduces total porosity, and transforms harmful pores to harmless ones, thus enhancing the compactness and mechanical properties of cement-based materials.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yundong Pu, Sen Yang, Meng Qi, Kuang Sheng, Junfeng Bi, Fukun Fan, Xiaoya Yuan
Summary: In this study, the effect of hybrid GO/HO-G on cement composites was investigated. The results showed that the combination of GO and HO-G led to a better improvement in the strength and durability of mortar compared to using GO or HO-G alone.
Article
Chemistry, Multidisciplinary
Shaoqiang Meng, Xiaowei Ouyang, Jiyang Fu, Yanfei Niu, Yuwei Ma
Summary: Graphene and graphene oxide have been shown to significantly improve the mechanical properties of cement-based materials by accelerating the nucleation and growth of C-S-H on the cement surface. The presence of high mobility ions derived by graphene in the cement paste enhances the interaction between the cement surface and ions, facilitating the hydration of cement.
NANOTECHNOLOGY REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Sen Yang, Wen Jia, Yuangui Wang, Weifu Zhang, Xiaoya Yuan
Summary: This study introduced hydroxyl groups onto graphene nanosheets to prepare water-soluble hydroxylated graphene (HO-G), which exhibited good dispersion and reinforcement effects in cement composites. Compared to graphene oxide (GO), HO-G showed superior compressive and flexural strength enhancements, as well as reduced chloride ion permeability in cement mortar applications.
Article
Construction & Building Technology
Xinming Wang, Jing Zhong
Summary: When graphene oxide (GO) is mixed with cement, it can exist in different dispersion states, including well-dispersed, grain-adsorbed, and self-agglomerated. The effects of GO in grain-adsorbed and self-agglomerated states on tricalcium silicate (C3S) hydration were investigated in this study. The results showed that GO in grain-adsorbed state limits the accessibility of reactant for hydration at early age, while GO in self-agglomerated state absorbs calcium ions from the pore solution, leading to inhibition of hydration. These findings enhance the understanding of GO in cement hydration and its potential use in cementitious materials.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Construction & Building Technology
Zijian Jia, Zedi Zhang, Lutao Jia, Ruilin Cao, Cheng Yu, Jinyao Yu, Yueyi Gao, Yamei Zhang
Summary: This study investigates the effect of CaO-based expansive agent (CEA) and MgO-based expansive agent (MEA) on the structural build-up process of cement paste. The findings indicate that CEA accelerates the structural build-up rate by increasing the ionic strength and promoting cement hydration, while MEA increases the initial static yield stress by reducing the interparticle distance and intensifying interparticle interactions. The combination of CEA and MEA can improve the structural build-up rate and initial static yield stress of the paste.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Environmental Sciences
Samuel De Carvalho Gomes, John L. Zhou, Xiaohui Zeng, Guangcheng Long
Summary: This research explores the application of water treatment sludge converted into biochar as a supplementary cementitious material. The results indicate that the incorporation of biochar improves the hydration kinetics and mechanical properties of cement paste, showing evidence of pozzolanic activity. Additionally, the use of biochar can avoid landfill and save valuable cementitious materials.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Construction & Building Technology
Shuangshuang Liu, Ya Chen, Xiangyu Li, Linhao Wang, Hongxiu Du
Summary: This study produced magnetic nanocomposites by attaching magnetite nanoparticles onto graphene oxide (GO). When an external magnetic field with a strength of 0.045 T was applied, GO nanosheets were aligned in the cement paste sample. The polarized Raman spectroscopy revealed that the orientation factor of aligned GO was 0.66, while that of randomly oriented GO was 0.53. The alignment of GO contributed to improved mechanical properties, with the flexural strength and modulus of elasticity of the specimen with aligned GO showing significant enhancements compared to the blank cement paste and the specimen with randomly oriented GO. This study provides valuable insights into the design of GO-infused cement-based materials through careful manipulation of the magnetic properties of GO.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Zhaoxia Yan, Haibo Zhang, Yu Zhu
Summary: This paper investigates the hydration process and kinetics of sulfoaluminate cement, and finds that the water/cement ratio (W/C) affects the hydration exothermic characteristics, microstructure, and strength of the cement.
MAGAZINE OF CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Yufeng Fan, Guosheng Zhang, Yue Li
Summary: This study investigated the effect of graphene oxide on magnesium phosphate cement, finding that proper addition of graphene oxide can improve the microstructure and mechanical properties of the cement, enhancing the hydration process.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Chunjin Lin, Zhiyan Liu, Yifan Gao, Zhaofeng Li, Jian Zhang, Hao Niu
Summary: This study discusses the effects of sodium gluconate, sodium hexametaphosphate, and sodium tripolyphosphate on the rheological behavior and mechanical property of red mud-based hybrid alkali activated cement (RM-HAAC). It aims to provide reference and guidance for the engineering application of RM-HAAC and shed light on red mud utilization. The results show that sodium gluconate delays the hydration rate, sodium hexametaphosphate promotes the hydration rate, and sodium tripolyphosphate has a certain promoting effect. The 28-day compressive strength is improved under the influence of retarder and sodium tripolyphosphate shows the largest strength increase.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Xiaojuan Kang, Xiaohong Zhu, Xin Shu, Jiaping Liu
Summary: This paper provides a new perspective on the hydration process of graphene oxide (GO)/cement composites. It is found that GO has a significant impact on the hydration of four minerals, promoting their dissolution process. The addition of GO increases the formation of hydration products and the gel pore volume, leading to an improvement in hydration degree.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Dong Lu, Xianming Shi, Jing Zhong
Summary: This study investigates the interaction between carbon nanotubes (CNTs) and cement using CNT fibers as a platform. The findings reveal that oxidation treatment and graphene oxide (GO) nanocoating significantly enhance the interfacial bond strength between CNT and cement. Moreover, the observation of a continuous crystalline domain of calcium-silicate-hydrate (C-S-H) anchored to the GO nanosheets provides direct evidence for the seeding effect of GO on cement hydration.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Chemistry, Physical
Won-Kyung Kim, Gigwon Hong, Young-Ho Kim, Jong-Min Kim, Jin Kim, Jung-Geun Han, Jong-Young Lee
Summary: In this study, highly concentrated hydrogen nanobubble water was used as the blending water for cement mortar, leading to an improvement in compressive and flexural strengths. The densification of nanobubbles at high concentrations increased the probability of collisions with cement particles, accelerating hydration and pozzolanic reactions, ultimately increasing the strength of the cement.
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)