Welcome to my website! I am Geng Niu, a current MS student in Material Science and Engineering at Southeast University, China, advised by Professor Yamei Zhang.

Research Interests in 3D-printed Concrete

Preparation and performance of 3D-printed low-density concrete.
Rheological properties of 3D-printed concrete and excess paste layer theory.

Contact

[email protected]

Google Scholar | GitHub | CV

You can learn more about me through the following content:
Twitter | Bilibili

Curriculum Vitae

EDUCATION

Southeast University

· M.S. in Material Science and Engineering (2021 - present)
(Advisor: Prof. Yamei Zhang) (Average Score: 89.35/100, GRE: 330, TOEFL: 98)

· B.S. in Material Science and Engineering (2017 - 2021)
(GPA: 3.7/4.0, Average Score: 88.55/100)

RESEARCH EXPERIENCES

Jiangsu Key Laboratory of Construction Materials, Southeast University (12/2018 – present)
Advisor: Prof. Yamei Zhang
Research Topics: 3D printed concrete, Low-density Concrete

Research Title: 3D-Printed EPS Lightweight Concrete with Varying Densities
· Utilized EPS particles as lightweight aggregates for the preparation of 3D printed lightweight concrete, printing EPS concrete with varying densities through different proportions of EPS particles
· Properties characterization, including rheological properties and mechanical performance assessment
· Employed and enhanced the excess paste theory to elucidate the changes in rheological properties resulting from the incorporation of EPS particles
· Applied X-ray Computed Tomography (X-CT) to get the reconstruction images of specimens and used the u-Net method to segment, enabling the analysis of the distribution of EPS particles and voids

​ Research Title: Study on Preparation and Performance of 3D Printed Foam Concrete
· Used viscosity-modifying agents (HPMC) to fabricate 3D printed foam concrete and enhanced its mortar stability and printability
· Elucidated the impact of supplementary cementitious materials on the properties of foam concrete through analysis of rheological and mechanical properties

​ Research Title: Preparation and Performance of High Crack Resistant Foam Concrete
· Prepared foam concrete with various fine aggregates and fiber to enhance strength and diminish shrinkage
· Adopted X-CT and Scanning Electron Microscopy (SEM) to analyze the pore size and microstructure distribution of hardened concrete

PUBLICATIONS

Journal Articles († indicates co-first author, * indicates correspondent author)

1. Geng Niu, Chao Liu, Lutao Jia, Lei Ma, Yifan Shi, Yifan Jiang, Zijian Jia, Yu Chen, Nemkumar Banthia, & Yamei Zhang*. (2024). Preparation and Performance Analysis of 3D Printed Lightweight EPS Concrete: Insights from the Excess Paste Theory. Cement and Concrete Composites, 105509. [Link]
2. Liu, Chao, Yuning Chen, Zedi Zhang, Geng Niu, Yuanliang Xiong, Lei Ma, Qi Fu, Chun Chen, Nemkumar Banthia, & Yamei Zhang*. (2022). Study of the Influence of Sand on Rheological Properties, Bubble Features and Buildability of Fresh Foamed Concrete for 3D Printing. Construction and Building Materials, 356, 129292. [Link]
3. Ma, Lei, Qing Zhang, Hélène Lombois-Burger, Zijian Jia, Zedi Zhang, Geng Niu, & Yamei Zhang*. (2022). Pore Structure, Internal Relative Humidity, and Fiber Orientation of 3D Printed Concrete with Polypropylene Fiber and Their Relation with Shrinkage. Journal of Building Engineering, 61, 105250. [Link]

Manuscripts Drafted and Under Preparation

4. Lutao Jia, Geng Niu, Zijian Jia, Yifan Jiang & Yamei Zhang* . (manuscript drafted). Effect of recycled brick powder on hydration products, pore structure, and drying shrinkage of 3D printed concrete.

INTERNSHIP

Handan Longcheng Construction Engineering Co., Ltd. (06/2018 – 08/2018)
· Position: Technician
· Executed testing, characterization, and comprehensive documentation of raw material properties for ready-mixed concrete.
· Devise and adjust the concrete mix based on the characteristics of the raw materials.
· Implemented sampling and inspection procedures for delivered ready-mixed concrete products.

HONORS & AWARDS

· First-Class Postgraduate Scholarship, Southeast University (Top 10%) (2021)
· Changwen Miao Scholarship, Southeast University (Top 6%) (Twice) (2019 – 2020)

PROFESSIONAL EXPERIENCES

Teaching Assistant

· Cement Chemistry (2022)

Equipment Operator & Data Analyst

· Y.CT precision, X-ray tomography scanner, Southeast University (2022 - present)
· Zeiss Xradia 510 Versa, 3D X-ray microscope, Southeast University (2022 - present)

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