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Influence of printing direction on 3D-printed vascular based self-healing cementitious composites

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

Compared with other self-healing mechanisms, embedding vascular networks in cementitious matrix enables repairing wider cracks and performing multiple healing cycles. For vascular-based self-healing cementitious composites, additive manufacturing (AM) allows fabricating vascular structures with complex geometry. For Fused Filament Fabrication ...

book chapter 2023

document

Auxetic Behavior of Cementitious Cellular Composites Under Uniaxial Compression and Cyclic Loading

Xu, Y. (author), Schlangen, E. (author), Šavija, B. (author)

Mechanical behavior of cementitious cellular composites (CCC) with auxetic behavior was investigated under uniaxial compression and cyclic loading. Three cellular structures with different geometrical parameters are designed and prepared by 3D printing technique. Meanwhile, plain mortar and fiber reinforced mortar are used as constituent...

book chapter 2020

document

On The Role Of Soft Inclusions On The Fracture Behaviour Of Cement Paste

Mercuri, L. (author), Romero Rodriguez, C. (author), Xu, Y. (author), Chaves Figueiredo, S. (author), Mors, R.M. (author), Rossi, E. (author), Anglani, G. (author), Antonaci, P. (author), Šavija, B. (author), Schlangen, E. (author)

Soft inclusions, such as capsules and other particulate admixtures are increasingly being used in cementitious materials for functional purposes (i.e. self-healing and self-sensing of concrete). Yet, their influence on the fracture behaviour of the material is sometimes overlooked and requires in-depth study for the optimization of mechanical...

conference paper 2019

document

Creating Strain Hardening Cementitious Composites (SHCCS) Through Use Of Additively Manufactured Polymeric Meshes As Reinforcement

Xu, Y. (author), Schlangen, E. (author), Šavija, B. (author)

Strain hardening cementitious composites are a class of cementitious materials showing metal-like (i.e. pseudo-plastic) behavior in tension due to their multiple cracking ability. This is commonly achieved through use of fiber reinforcement (such as PVA) or, similarly, textile reinforcement (TRC). Increasing the ductility is important in...

conference paper 2019

document

Compression Behaviors Of Cementitious Cellular Composites With Negative Poisson’s Ratio

Xu, Y. (author), Šavija, B. (author), Schlangen, E. (author)

Traditionally, mechanical properties of cementitious materials are designed<br/>“chemically”, namely by configuring their mix proportions. Owning to the development of 3D printing technology, “physical” tailoring the meso-structure of cementitious materials to design their mechanical properties becomes possible. In the present study,...

conference paper 2019

document

Flexural response of cementitious mortar bars reinforced by 3D printed polymeric mesh

Huigen, Vincent (author), Xu, Y. (author), Schlangen, E. (author), Šavija, B. (author)

In order to improve the behaviour of cementitious material under in bending, 3D printed polymeric lattice meshes were used as an alternative to fibre reinforcement. Lattice meshes with different cell sizes and different surface roughness were designed and printed. Plain mortar samples and reinforced samples were casted. After curing, 4-point...

conference paper 2018

document

Convolutional neural network for predicting crack pattern and stress-crack width curve of air-void structure in 3D printed concrete

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

Extrusion-based 3D concrete printing (3DCP) results in deposited materials with complex microstructures that have high porosity and distinct anisotropy. Due to the material heterogeneity and rapid growth of cracks, fracture analysis in these air-void structures is often complex, resulting in a high computational cost. This study proposes a...

journal article 2022

document

Mechanical Properties of Lightweight Cementitious Cellular Composites Incorporating Micro-Encapsulated Phase Change Material

Wu, Zixia (author), Xu, Y. (author), Šavija, B. (author)

This work focuses on combining digitally architected cellular structures with cementitious mortar incorporating micro-encapsulated phase change material (mPCM) to fabricated lightweight cementitious cellular composites (LCCCs). Voronoi structures with different randomness are designed for the LCCCs. Aided by the indirect 3D printing technique,...

journal article 2021

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Architected Cementitious Cellular Materials: Peculiarities and opportunities

Xu, Y. (author), Šavija, B. (author)

Conventionally, the properties of cementitious materials are tailored by a simple but efficient method: mixture proportion design. For a given cementitious mixture, the chemical and physical properties of cementitious materials have already been determined. Consequently, the mechanical performance of the hardened cementitious material is...

journal article 2021

document

Auxetisch cementgebonden composiet

Xu, Y. (author), Schlangen, E. (author), Šavija, B. (author)

Door toepassing van 3D-printtechnieken kunnen cementgebonden materialen worden ontwikkeld met een bijzondere, niet-homogene interne structuur. Deze materialen kunnen auxetisch gedrag vertonen: ze zetten zijdelings uit (worden dikker) wanneer ze worden uitgerekt en ze trekken zijdelings samen als ze worden samengeperst. Aan de TU Delft is...

journal article 2020

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Combined experimental and numerical study of uniaxial compression failure of hardened cement paste at micrometre length scale

Zhang, H. (author), Xu, Y. (author), Gan, Y. (author), Chang, Z. (author), Schlangen, E. (author), Šavija, B. (author)

The aim of this work is to investigate the mechanical performance of hardened cement paste (HCP) under compression at the micrometre length scale. In order to achieve this, both experimental and numerical approaches were applied. In the experimental part, micrometre sized HCP specimens were fabricated and subjected to uniaxial compression by...

journal article 2019

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A discrete lattice model for assessment of buildability performance of 3D-printed concrete

Chang, Z. (author), Xu, Y. (author), Chen, Y. (author), Gan, Y. (author), Schlangen, E. (author), Šavija, B. (author)

In this work, the lattice model is applied to study the printing process and quantify the buildability (i.e., the maximum height that can be printed) for 3D concrete printing (3DCP). The model simulates structural failure by incorporating an element birth technique, time-dependent stiffness and strength, printing velocity, non-uniform...

journal article 2021

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Experimental study of flexural fatigue behaviour of cement paste at the microscale

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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Towards understanding deformation and fracture in cementitious lattice materials: Insights from multiscale experiments and simulations

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

Tailoring lattice structures is a commonly used method to develop lattice materials with desired mechanical properties. However, for cementitious lattice materials, besides the macroscopic lattice structure, the multi-phase microstructure of cement paste may have substantial impact on the mechanical responses. Therefore, this work proposes a...

journal article 2022

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Thermomechanical Performance Analysis of Novel Cement-Based Building Envelopes with Enhanced Passive Insulation Properties

Marin-Montin, Jorge (author), Roque, Eduardo (author), Xu, Y. (author), Šavija, B. (author), Serrano-Ruiz, Juan Carlos (author), Montero-Chacón, Francisco (author)

The design of new insulating envelopes is a direct route towards energy efficient buildings. The combinations of novel materials, such as phase-change (PCM), and advanced manufacturing techniques, such as additive manufacturing, may harness important changes in the designing of building envelopes. In this work we propose a novel methodology for...

journal article 2022

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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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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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Auxetic cementitious composites (ACCs) with excellent compressive ductility: Experiments and modeling

Xu, Y. (author), Šavija, B. (author)

Auxetic cementitious composites (ACCs) with improved mechanical properties are created, by casting 3D printed polymeric auxetic reinforcement structures inside cementitious mortar. Four types of ACCs incorporating reinforcement with different auxetic mechanisms were prepared: “re-entrant” (RE), “rotating-square” (RS), “chiral” (CR) and ...

journal article 2023

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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