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Peanut shaped auxetic cementitious cellular composite (ACCC)

Xie, J. (author), Xu, Y. (author), Meng, Z. (author), Liang, M. (author), Wan, Z. (author), Šavija, B. (author)

Auxetic cementitious cellular composites (ACCCs) exhibit desirable mechanical properties (e.g., high fracture resistance and energy dissipation), due to their unique deformation characteristics. In this study, a new type of cementitious auxetic material, referred to as peanut shaped ACCC, has been designed and subsequently architected using...

journal article 2024

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Automatic enhancement of vascular configuration for self-healing concrete through reinforcement learning approach

Wan, Z. (author), Xu, Y. (author), Chang, Z. (author), Liang, M. (author), Šavija, B. (author)

Vascular self-healing concrete (SHC) has great potential to mitigate the environmental impact of the construction industry by increasing the durability of structures. Designing concrete with high initial mechanical properties by searching a specific arrangement of vascular structure is of great importance. Herein, an automatic optimization...

journal article 2024

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The use of additive manufacturing in self-healing cementitious materials: A state-of-the-art review

Wan, Z. (author), Xu, Y. (author), He, S. (author), Schlangen, E. (author), Šavija, B. (author)

This paper presents a state-of-the-art review on the application of additive manufacturing (AM) in self-healing cementitious materials. AM has been utilized in self-healing cementitious materials in three ways: (1) concrete with 3D-printed capsules/vasculatures; (2) 3D concrete printing (3DCP) with fibers or supplementary cementitious...

journal article 2024

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Field Test and Numerical Study of Train-Induced Vibration of Over-Track Buildings Above Metro Depot

Chen, Zhaowei (author), Wan, Fangshuang (author), He, C. (author)

To maximize the use of urban land, many cities have built buildings above metro depots. However, the low-frequency vibration caused by metro operation affects the lives of surrounding residents, which seriously restricts the further development of over-track buildings. To study this problem, Firstly, the vibration of the metro depot and...

journal article 2024

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Comprehensive properties assessment of asphalt binder under aqueous solutions with different pH values and its gradient damage behaviors

Zou, Yingxue (author), Wu, Shaopeng (author), Chen, Anqi (author), Liu, Quantao (author), Amirkhanian, Serji (author), Xu, S. (author), Yang, Chao (author), Wan, Pei (author), Xu, Haiqin (author), Lu, Ziyu (author)

This study characterized the morphology, high-temperature property, rheological property, adhesion, cohesion, and chemical component of asphalt binder under aqueous solutions of different pH values. Then the physicochemical properties of asphalt binder were comprehensively evaluated by the improved radar chart. The properties of asphalt...

journal article 2024

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Optimization of vascular structure of self-healing concrete using deep neural network (DNN)

Wan, Z. (author), Chang, Z. (author), Xu, Y. (author), Šavija, B. (author)

In this paper, optimization of vascular structure of self-healing concrete is performed with deep neural network (DNN). An input representation method is proposed to effectively represent the concrete beams with 6 round pores in the middle span as well as benefit the optimization process. To investigate the feasibility of using DNN for...

journal article 2023

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Direct ink writing of vascularized self-healing cementitious composites

Wan, Z. (author), Xu, Y. (author), He, S. (author), Chen, Y. (author), Xie, J. (author), Šavija, B. (author)

Direct ink writing of cementitious materials can be an alternative way for creating vascular self-healing concrete by intentionally incorporating hollow channels in the cementitious matrix. In this study, a 3D-printable fibre reinforced mortar was first developed. Three groups of specimens were fabricated using direct ink writing, where the...

journal article 2023

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Microstructural characterization of crack-healing enabled by bacteria-embedded polylactic acid (PLA) capsules

He, S. (author), Wan, Z. (author), Chen, Y. (author), Jonkers, H.M. (author), Schlangen, E. (author)

The current study investigates short-term and long-term crack-healing behaviour of mortars embedded with bacteria-based poly-lactic acid (PLA) capsules under both ideal and realistic environmental conditions. Two sets of specimens were prepared and subjected to different healing regimes, with the first set kept in a mist room for varying...

journal article 2023

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Auxetic cementitious cellular composite (ACCC) PVDF-based energy harvester

Xie, J. (author), Xu, Y. (author), Wan, Z. (author), Ghaderiaram, A. (author), Schlangen, E. (author), Šavija, B. (author)

The high deformation capacity of auxetic cementitious cellular composites (ACCCs) makes them promising for strain-based energy harvesting applications in infrastructure. In this study, a novel piezoelectric energy harvester (PEH) with ACCCs and surface-mounted PVDF film based on strain-induced piezoelectric mechanisms has been designed,...

journal article 2023

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Journaling memorable and meaningful tourism experiences: A strengths-based approach to technology-mediated reminiscence

Wan, C. K.Bruce (author), de Bont, Cees J.P.M. (author), Hekkert, P.P.M. (author), Filep, Sebastian (author), Chow, Kenny K.N. (author)

Reminiscing on memorable travel experiences is a common practice amongst many travellers. This study introduces positive psychology interventions – cultivation of character strengths and savouring strategies - to examine memorable and meaningful tourism experiences (MMEs). Although both interventions aim to increase well-being, little...

journal article 2023

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Self-healing cementitious composites with a hollow vascular network created using 3D-printed sacrificial templates

Wan, Z. (author), Zhang, Y. (author), Xu, Y. (author), Šavija, B. (author)

Additively manufactured vascular networks have great potential for use in autonomous self-healing of cementitious composites as they potentially allow multiple healing events to take place. However, the existence of a vascular tube wall may impede with the healing efficiency if it does not rupture timely to release the healing agent. The...

journal article 2023

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Carbonation and related behaviors of hardened cement pastes under different hydration degrees

Xu, Yaowen (author), Liang, X. (author), Wan, Chaojun (author), Yang, Hongyu (author), Feng, Xiaming (author)

This paper develops a kind of molded disc samples to investigate the carbonation and related behaviors of hardened cement pastes under different previous hydration degrees. Weight and length changes of cement pastes over time are monitored during a multistep process including carbonation, drying, rewetting, and redrying. The combination of X...

journal article 2023

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Early-age creep of 3D printable mortar: Experiments and analytical modelling

Chang, Z. (author), Liang, M. (author), Xu, Y. (author), Wan, Z. (author), Schlangen, E. (author), Šavija, B. (author)

In this study, an experimental setup to characterize the early-age creep of 3D printable mortar was proposed. The testing protocol comprises quasi-static compressive loading-unloading cycles, with 180-s holding periods in between. An analytical model based on a double power law was used to predict creep compliance with hardening time and...

journal article 2023

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Investigation of the moisture damage and the erosion depth on asphalt

Zou, Yingxue (author), Xu, Haiqin (author), Xu, S. (author), Chen, Anqi (author), Wu, Shaopeng (author), Amirkhanian, Serji (author), Wan, Pei (author), Gao, Xiang (author)

Moisture erosion is one of the key factors leading to asphalt pavement damage, and the erosion depth indicates the moisture damage level but it is usually neglected. In order to study the moisture erosion and the erosion depth, this study characterized the chemical structure, rheological property and adhesion property of asphalt at different...

journal article 2023

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Signal-dependent reactivity of host-guest complexes controls supramolecular aggregate formation

Li, G. (author), Wan, Yucheng (author), Lewis, R.W. (author), Fan, B. (author), Eelkema, R. (author)

Living systems can respond to their environment through signal transduction cascades. In these cascades, original stimuli are amplified and translated into reaction or assembly events. In an effort to instill synthetic materials with biomimetic responsivity, we report an aggregation process forming a supramolecular network held together by...

journal article 2023

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The reinforcement effects of PVA, PE, and steel fibers on AAS material

Xu, Yaowen (author), Wan, Chaojun (author), Liang, X. (author), Yang, Hongyu (author)

This paper employs PVA, PE, steel fibers, as well as the hybrids of two of the three fibers to reinforce alkali-activated slag (AAS) material, aiming to prepare strain-hardening and clinker-free composites. The flexural strength, compressive strength, uniaxial tensile performance of the composites and bond behavior between fibers and the...

journal article 2022

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Early age hydration of model slag cement: Interaction among C₃S, gypsum and slag with different Al₂O₃ contents

Zhang, Y. (author), Wan, Z. (author), Miranda de Lima Junior, L.C. (author), Copuroglu, Oguzhan (author)

A deeper insight into SO₃/Al₂O₃ ratio including the contribution of alumina in slag at early age is required to ensure a properly sulfated slag cement. In this paper, to investigate the effect of gypsum and alumina of slag, emphasis was laid on the hydration characteristics of C₃S-gypsum-slag system...

journal article 2022

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Mechanical properties and healing efficiency of 3D-printed ABS vascular based self-healing cementitious composite: Experiments and modelling

Wan, Z. (author), Xu, Y. (author), Zhang, Y. (author), He, S. (author), Šavija, B. (author)

Cracking is one of the main causes for deterioration of concrete structures. Self-healing concrete with 3D-printed vascular networks has excellent potential for autonomous self-healing. This approach is scarcely investigated: no studies have been devoted to the influence of printing parameters on the properties of vascular based self-healing...

journal article 2022

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Interpretable Ensemble-Machine-Learning models for predicting creep behavior of concrete

Liang, M. (author), Chang, Z. (author), Wan, Z. (author), Gan, Y. (author), Schlangen, E. (author), Šavija, B. (author)

This study aims to provide an efficient and accurate machine learning (ML) approach for predicting the creep behavior of concrete. Three ensemble machine learning (EML) models are selected in this study: Random Forest (RF), Extreme Gradient Boosting Machine (XGBoost) and Light Gradient Boosting Machine (LGBM). Firstly, the creep data in...

journal article 2022

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Microstructure-informed deep convolutional neural network for predicting short-term creep modulus of cement paste

Liang, M. (author), Gan, Y. (author), Chang, Z. (author), Wan, Z. (author), Schlangen, E. (author), Šavija, B. (author)

This study aims to provide an efficient alternative for predicting creep modulus of cement paste based on Deep Convolutional Neural Network (DCNN). First, a microscale lattice model for short-term creep is adopted to build a database that contains 18,920 samples. Then, 3 DCNNs with different consecutive convolutional layers are built to learn...

journal article 2022