2022 SFP 1-1 COMPLETED

Release time: 2024/07/17 Publisher： original Views：

Research on 3D Printed Polymer Modified Concrete
and Its Interface Enhancement Technology

Principal Investigator：

Wang Zhendi
China Building Materials Academy

Project Background:

Concrete 3D printing enables quick and efficient completion of automatic construction of buildings. However, ordinary concrete can hardly meet the requirements of 3D printing owing to poor printability and buildability of fresh slurries. Moreover, weak bonding interface between filaments highly limits the development and application of 3D printing concrete. All these challenges may be addressed by the continually developed petroleum based products, and promote the coordinated development of concrete 3D printing and petroleum-based polymer applications.

Aims & Goals:

1. To improve the printability of 3D printing concrete by using polymer emulsion, polyacrylamide and hydroxymethyl cellulose;

2. To improve the toughness, ductility and deformability of 3D printing concrete by using polymer fibers in concrete matrix;

3. To develop a polymer emulsion spraying system in synchronization during concrete 3D printing, increasing the interface strength of concrete;

4. To design and manufacture a novel Nylon-based saddle stitching nails reinforcement for 3D printing concrete.

Outcomes:

1. 7.5% dosage of petroleum-based polymer emulsion improved the rheology and printability properties of cement based materials;

2. 0.6% dosage of polyethylene fiber improved the toughness of 3D priting concrete, with fibers exhibiting aggregation and vertical printing direction distribution in the interlayer area, and fibers exhibiting dispersion and parallel printing direction distribution inside the matrix;

3. Application of 2% Nylon-based (Polyamide, PA) saddle stitching nails reinforcement technology for 3D priting concrete was greatly promoted.

PAPER 1: 'Differences in micro grainfiber distributions between matrix and interlayer of cementitious filaments affected by extrusion molding'

Additive Manufacturing, 2022, 60: 103236

DOI: https://doi.org/10.1016/j.addma.2022.103236

PAPER 2: 'Gradient distribution of slender glass microfibers in 3D printed cementitious filaments'

The 16th International Congress on the Chemistry of Cement 2023.

PAPER 3: 'Rebar-matrix interface in extrusion molded cementitious filaments'

XVI International Conference on Durability of Building Materials and Components 2023.

PATENT 1: Micro vibration method and 3D printing of concrete components (filed)

PATENT 2: Preparation method and application of polymer emulsion (filed)

STANDARD 1: Industry standard - Test method for interfacial bonding strength of 3D-printed cement-based materials (for approval)

DEMONSTRATION：'3D printing water curtain wall landscape'.