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Liang, M. (author), He, S. (author), Gan, Yidong (author), Zhang, Hongzhi (author), Chang, Z. (author), Schlangen, E. (author), Šavija, B. (author)
This paper employs computer vision techniques to predict the micromechanical properties (i.e., elastic modulus and hardness) of cement paste based on an input of Backscattered Electron (BSE) images. A dataset comprising 40,000 nanoindentation tests and 40,000 BSE micrographs was built by express nanoindentation test and Scanning Electron...
journal article 2023
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Liang, M. (author), Chang, Z. (author), Zhang, Y. (author), Cheng, H. (author), He, S. (author), Schlangen, E. (author), Šavija, B. (author)
This study aims to experimentally investigate the autogenous deformation and the stress evolution in restrained high-volume ground granulated blast furnace slag (GGBFS) concrete. The Temperature Stress Testing Machine (TSTM) and Autogenous Deformation Testing Machine (ADTM) were used to study the macro-scale autogenous deformation and stress...
journal article 2023
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Chen, Y. (author), Liang, M. (author), Zhang, Y. (author), Li, Z. (author), Šavija, B. (author), Schlangen, E. (author), Copuroglu, Oguzhan (author)
Autogenous shrinkage may be a critical issue concerning the use of limestone-calcined clay-cement (LC3) in high-performance concrete and 3D printable cementitious materials, which have relatively low water to binder (W/B) ratio. Adding an internal curing agent, i.e., superabsorbent polymer (SAP), could be a viable solution in this context....
journal article 2023
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Chen, Y. (author), Zhang, Y. (author), He, S. (author), Liang, M. (author), Zhang, Yamei (author), Schlangen, E. (author), Copuroglu, Oguzhan (author)
Limestone-calcined clay-cement (LC3), as one of the most promising sustainable cements, has been under development over the past decade. However, many uncertainties remain regarding its rheological behaviors, such as the metakaolin content of calcined clay. This study aims to investigate the effect of increasing the content of fine-grained...
journal article 2023
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Zhang, H. (author), Jin, Zuquan (author), Jiang, Nengdong (author), Ge, Zhi (author), Schlangen, E. (author), Ling, Yifeng (author), Šavija, B. (author), Wang, Zheng (author)
The classically lattice model assumes the local elements behave elastic brittle, neglecting the ductility of the mortar matrix. This leads to the simulated load⁃displacement response more brittle than the realistic. To solve the aforementioned issue, a piece⁃wise approach was introduced to describe the elastic⁃plastic constitutive relation of...
journal article 2023
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Chen, Y. (author), Zhang, Y. (author), He, S. (author), Liang, X. (author), Schlangen, E. (author), Copuroglu, Oguzhan (author)
In 3D concrete printing, fast structuration is a prerequisite for ideal buildability. This paper aims to study the impact of inorganic additives, i.e., CaCl<sub>2</sub> and gypsum, on structural build-up and very early-age hydration of limestone-calcined clay-cement (LC3) pastes within the first 70–80 min. Results show that, increasing the...
journal article 2023
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Liang, M. (author), Zhang, Y. (author), He, S. (author), Chen, Y. (author), Schlangen, E. (author), Šavija, B. (author)
This study investigated the evolution process of high-volume slag cement (HVSC) paste from a chemo-mechanical standpoint. HVSC specimens with a 70 w.t. % slag replacement rate were studied at various ages. Evolution of phase assemblage, microstructure development, and micromechanical properties were analyzed using TGA/XRD/MIP/SEM-EDS and nano...
journal article 2023
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Sun, Renjuan (author), Han, Lebing (author), Zhang, Hongzhi (author), Ge, Zhi (author), Guan, Yanhua (author), Ling, Yifeng (author), Schlangen, E. (author), Šavija, B. (author)
This paper presents a study on cracking characterization of engineered cementitious composites (ECC) under flexural cyclic load using digital image correlation (DIC) technique. Five stress levels, namely 0.65, 0.75, 0.8, 0.85 and 0.9 of the flexural strength, were applied. Strain map at the side surface was obtained by DIC and used to drive...
journal article 2022
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Zhang, Y. (author), Schlangen, E. (author), Copuroglu, Oguzhan (author)
The effect of slag of different origins (synthetic slag produced in the laboratory and commercial slag collected from different steel factories) with comparable chemical composition, amorphous content and particle size distribution, on the hydration characteristics of slag cement was investigated. In order to study the effect of sulfur in...
journal article 2022
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Chang, Z. (author), Zhang, Hongzhi (author), Liang, M. (author), Schlangen, E. (author), Šavija, B. (author)
This paper explores buildability quantification of randomly meshed 3D printed concrete objects by considering structural failure by elastic buckling. The newly proposed model considers the most relevant printing parameters, including time-dependent material behaviors, printing velocity, localized damage and influence of sequential printing...
journal article 2022
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Gan, Y. (author), Zhang, Hongzhi (author), Liang, M. (author), Zhang, Y. (author), Schlangen, E. (author), van Breugel, K. (author), Šavija, B. (author)
In this study, the flexural strength and fatigue properties of interfacial transition zone (ITZ) were experimentally investigated at the micrometre length scale. The hardened cement paste cantilevers (150 × 150 × 750 μm<sup>3</sup>) attached to a quartzite aggregate surface were prepared and tested under the monotonic and cyclic load using a...
journal article 2022
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He, S. (author), Zhang, Shizhe (author), Lukovic, M. (author), Schlangen, E. (author)
Strain hardening cementitious composite (SHCC) is a special class of ultra-ductile material which has autogenous self-healing capability due to its intrinsic tight crack widths. To further improve its healing ability, healing agent (HA) can be incorporated in SHCC, enabling it also the autonomous self-healing mechanism. In this study, the...
journal article 2022
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Zhang, H. (author), Schlangen, E. (author), Ge, Z. (author), Šavija, B. (author)
Properties of concrete are, to a large extent, dependent on the properties of its binding constituent, hydrated cement paste. Therefore, knowledge of properties of hydrated cement paste is crucial for predicting concrete behaviour. This paper presents an experimentally informed approach for modelling elastic and transport properties of cement...
conference paper 2021
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Gan, Y. (author), Romero Rodriguez, C. (author), Zhang, Hongzhi (author), Schlangen, E. (author), van Breugel, K. (author), Šavija, B. (author)
This paper presents a method to numerically investigate the microstructural effect on the creep behavior of cement paste at the microscale. The lattice fracture model is extended to consider local time-dependent deformations of calcium-silicate-hydrate phases in the cement paste by imposing local forces. The term “experimentally informed...
journal article 2021
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Zhang, H. (author), Schlangen, E. (author), Ge, Zhi (author), Šavija, B. (author)
Properties of concrete are, to a large extent, dependent on the properties of its binding constituent, hydrated cement paste. Therefore, knowledge of properties of hydrated cement paste is crucial for predicting concrete behaviour. This paper presents an experimentally informed approach for modelling elastic and transport properties of cement...
conference paper 2021
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Zhang, Hongzhi (author), Yuan, Huaqiang (author), Ge, Zhi (author), Wu, Jiajie (author), Fang, Cheng (author), Schlangen, E. (author), Šavija, B. (author)
Clay brick is one of the major components of demolition waste, which is generally landfilled. Effective and new uses of recycled clay brick may provide sustainability benefits in terms of landfill reduction. Therefore, this research aims at applying Recycled fine clay brick aggregates (RFCBA) with sizes from 0.075 mm–4.75 mm to prepare Self...
journal article 2021
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Gan, Y. (author), Zhang, Hongzhi (author), Liang, M. (author), Schlangen, E. (author), van Breugel, K. (author), Šavija, B. (author)
In this study, a numerical model using a 2D lattice network is developed to investigate the fatigue behaviour of cement paste at the microscale. Images of 2D microstructures of cement pastes obtained from XCT tests are used as inputs and mapped to the lattice model. Different local mechanical and fatigue properties are assigned to different...
journal article 2021
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Gan, Y. (author), Zhang, Hongzhi (author), Zhang, Y. (author), Xu, Y. (author), Schlangen, E. (author), van Breugel, K. (author), Šavija, B. (author)
This study presents an experimental investigation of fatigue properties of cement paste at the microscale. A strong size dependence is found for the flexural fatigue life of the cement paste specimen. Microscopic observations on the fractured surfaces suggest that there is a higher density of nano-scale cracks generated during the fatigue...
journal article 2021
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Chen, Y. (author), He, S. (author), Zhang, Y. (author), Wan, Z. (author), Copuroglu, Oguzhan (author), Schlangen, E. (author)
This paper aims to investigate the influences of high Portland cement substitutions (&gt;60 wt%) by low-grade calcined clay (CC) and limestone (LF) on 3D concrete printability, stiffness evolution and early-age hydration. Results show that, with the same dosage of admixtures (superplasticizer and viscosity modifier), increasing LF and CC...
journal article 2021
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Xu, S. (author), Liu, X. (author), Tabakovic, A. (author), Lin, P. (author), Zhang, Y. (author), Nahar, S. (author), Lommerts, B. J. (author), Schlangen, E. (author)
Rejuvenator encapsulation technique showed great potential for extrinsic asphalt pavement damage healing. Once the capsules are embedded within asphalt pavement, the healing is activated on-demand via progressing microcrack. When the microcrack encounters the capsule, the fracture energy at the tip opens the capsule and releases the...
journal article 2021
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