Searched for: author:"Ye, G."
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Li, Z. (author), Lu, T. (author), Chen, Y. (author), Wu, B. (author), Ye, G. (author)
This study aims to predict the autogenous shrinkage of alkali-activated concrete (AAC) based on slag and fly ash. A variety of analytical and numerical models are available for the prediction of autogenous shrinkage of ordinary Portland cement (OPC) concrete, but these models are found to show dramatic discrepancies when applied for AAC due...
journal article 2021
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Zuo, Y. (author), Ye, G. (author)
For the first time, this study developed a novel model, named GeoMicro3D, to simulate the reaction process and microstructure formation of alkali-activated slag. The GeoMicro3D model consists of four modules that are designed to simulate, respectively: (i) the initial spatial distribution of real-shape slag particles in alkaline activator, ...
journal article 2021
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Li, Z. (author), Liang, X. (author), Chen, Y. (author), Ye, G. (author)
The high autogenous shrinkage of alkali-activated materials made from slag and fly ash is recognised as a major drawback with regard to the use as construction materials. In this study, metakaolin was introduced into the alkali-activated slag-fly ash (AASF) paste to mitigate the autogenous shrinkage. The shrinkage mitigation mechanism of...
journal article 2021
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Li, Z. (author), Wyrzykowski, Mateusz (author), Dong, H. (author), Granja, José (author), Azenha, Miguel (author), Lura, Pietro (author), Ye, G. (author)
In this study, internal curing by superabsorbent polymers (SAP) is utilized to mitigate self-desiccation and autogenous shrinkage of alkali-activated slag (AAS) pastes. Absorption and desorption kinetics of SAP incorporated in AAS pastes were studied with X-ray tomography. Internal curing delayed the peak of the rate of heat liberation but...
journal article 2020
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Zhang, Y. (author), Ye, G. (author), Yang, Zhengxian (author)
Microstructure-property relationship has drawn strong attention in modern material science. The progress achieved in this field relies on a common basis that the material performance originates from the microstructure. This paper brings together new insights and facts from experiments regarding the pore size dependent connectivity and its...
journal article 2020
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Li, Z. (author), Lu, Tianshi (author), Liang, X. (author), Dong, H. (author), Ye, G. (author)
This study aims to provide a better understanding of the autogenous shrinkage of slag and fly ash-based alkali-activated materials (AAMs) cured at ambient temperature. The main reaction products in AAMs pastes are C-A-S-H type gel and the reaction rate decreases when slag is partially replaced by fly ash. Due to the chemical shrinkage and the...
journal article 2020
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Gluth, Gregor J.G. (author), Arbi Ghanmi, K. (author), Bernal, Susan A. (author), Bondar, Dali (author), Castel, Arnaud (author), Chithiraputhiran, Sundararaman (author), Dehghan, Alireza (author), Dombrowski-Daube, Katja (author), Dubey, Ashish (author), Ducman, Vilma (author), Peterson, Karl (author), Pipilikaki, Penny (author), Valcke, Siska L.A. (author), Ye, G. (author), Zuo, Y. (author), Provis, John L. (author)
Many standardised durability testing methods have been developed for Portland cement-based concretes, but require validation to determine whether they are also applicable to alkali-activated materials. To address this question, RILEM TC 247-DTA ‘Durability Testing of Alkali-Activated Materials’ carried out round robin testing of carbonation...
journal article 2020
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Zhang, Y. (author), Ye, G. (author), Yang, Zhengxian (author)
Concrete is rarely saturated. Reliable durability design of marine concrete structures requires a solid understanding of the long-term chloride transport in unsaturated concretes. This paper presents a critical analysis of the time-dependent chloride diffusion coefficient in unsaturated cementitious materials exposed to marine environment....
journal article 2020
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Zhang, Y. (author), Yang, Zhengxian (author), Ye, G. (author)
Conceptual analysis is performed to examine the effects of pore features on the water continuity in unsaturated porous systems. The roles of pore features in relative chloride diffusion coefficient (D<sub>rc</sub>) of mortar specimens at various degrees of water saturation (S<sub>w</sub>) were studied based on mercury intrusion porosimetry...
journal article 2020
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Ouyang, Xiaowei (author), Ma, Yuwei (author), Liu, Ziyang (author), Liang, Jianjun (author), Ye, G. (author)
This paper presents the results of an experimental study performed to investigate the effect of activator modulus (SiO<sub>2</sub>/Na<sub>2</sub>O) and slag addition on the fresh and hardened properties of alkali-activated fly ash/slag (AAFS) pastes. Four activator moduli (SiO<sub>2</sub> /Na<sub>2</sub>O), i.e., 0.0, 1.0, 1.5, and 2.0, and...
journal article 2020
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Zhang, S. (author), Li, Victor C. (author), Ye, G. (author)
Strain-hardening geopolymer composite (SHGC) lately emerged as a promising alternative to traditional strain-hardening cementitious composite with added advantages of industrial by-product utilization and enhanced sustainability. However, as the design of SHGC requires multi-factor optimization, the application of traditional trial-and-error...
journal article 2020
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Tavakoli, D. (author), Gao, P. (author), Tarighat, Amir (author), Ye, G. (author)
In this study, first of all, the atomistic structure of cement hydration products is estimated via molecular dynamics method and their elastic properties are extracted. Then, cement hydration simulation is done by HYMOSTRUC3D model and the obtained results from both molecular dynamics and HYMOSTRUC3D methods are used for simulation in macro...
journal article 2020
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Lifshitz Sherzer, G. (author), Schlangen, E. (author), Ye, G. (author), Gal, A. E. (author)
We propose an upscaled methodology for evaluating the compressive parameters of the Lattice Discrete Particle Model (LDPM) for a multiscale analysis of concrete structures. This methodology is based on mechanical and chemical models on a wide range of concrete scales. We show that the compressive mechanical parameters are related mainly to...
journal article 2020
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Ouyang, Xiaowei (author), Wang, Liquan (author), Xu, Shida (author), Ma, Yuwei (author), Ye, G. (author)
Carbonation treatment can effectively improve the performance of recycled concrete aggregate and fines due to the reactions of CO<sub>2</sub> with CH and C–S–H gel of cement paste. To better understand the mechanisms involved in the performance improvement, the surface properties of carbonated recycled cement paste powder (CRP) and its effect...
journal article 2020
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Li, Z. (author), Yao, X. (author), Chen, Y. (author), Lu, T. (author), Ye, G. (author)
Alkali-activated slag and fly ash (AASF) materials are emerging as promising alternatives to conventional Portland cement. Despite the superior mechanical properties of AASF materials, they are known to show large autogenous shrinkage, which hinders the wide application of these eco-friendly materials in infrastructure. To mitigate the...
journal article 2020
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Li, Z. (author), Zhang, S. (author), Liang, X. (author), Ye, G. (author)
This study aims to investigate the cracking potential of alkali-activated slag (AAS) and alkali-activated slag-fly ash (AASF) concrete subjected to restrained autogenous shrinkage. Temperature Stress Testing Machine (TSTM) is utilized, for the first time, to monitor the stress evolution and to measure the cracking time of alkali-activated...
journal article 2020
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Sanchez Dolado, J. (author), Goracci, Guido (author), Duque, Eduardo (author), Martauz, Pavel (author), Zuo, Y. (author), Ye, G. (author)
To find materials with an appropriate response to THz radiation is key for the incoming THz technology revolution. Unfortunately, this region of the electromagnetic spectra remains largely unexplored in most materials. The present work aims at unveiling the most significant THz fingerprints of cement-based materials. To this end transmission...
journal article 2020
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Li, Z. (author), Zhang, S. (author), Liang, X. (author), Granja, José (author), Azenha, Miguel (author), Ye, G. (author)
This study investigates the influences of internal curing on reducing the autogenous shrinkage of alkali-activated slag/fly ash (AASF) paste. The influences of internal curing with superabsorbent polymers (SAPs) on the reactions and microstructure of AASF paste are investigated. It is found that the SAPs absorb liquid mainly before the...
journal article 2020
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Zuo, Y. (author), Ye, G. (author)
Many calorimetric studies have been carried out to investigate the reaction process of alkali-activated slag paste. However, the origin of the induction period and action mechanism of soluble Si in the dissolution of slag are still not clear. Moreover, the mechanisms behind different reaction periods are not well described. In this study, the...
journal article 2020
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Li, Z. (author), Zhang, S. (author), Zuo, Y. (author), Chen, Wei (author), Ye, G. (author)
Chemical deformation (chemical shrinkage/expansion), the absolute volume change during reactions, is a key parameter influencing the volume stability, especially the autogenous deformation of a binder material. This work, for the first time, reports an in-depth investigation on the chemical deformation of metakaolin based geopolymer (MKG)....
journal article 2019
Searched for: author:"Ye, G."
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