Review meeting of CCPA standard Test Methods of Printability on 3D Printing Concrete Mixture and Test Methods of Mechanical Properties on 3D Printed Concrete was held by CCPA and CBMF in Beijing on December 22 to 23, 2021. 35 representatives from research and architectural design institutes, universities, industry associations, testing institutions, production enterprises and users attended the meeting, of which 15 were members of review committee.

The main drafters of the two standards introduced the standard preparation process, the collection of comments and the test data that support the main technical requirements in the standard respectively. The review committee reviewed all the documents, examined the standard text word by word and put forward revisions. The review committee made conclusions that technical indexes of both the two standards are advanced and applicable, the test methods are operable and they both reach international advanced level in general. Finally, the two CCPA standards were approved by unanimous approval.

Test Methods of Printability on 3D Printing Concrete Mixture defines the terms and definitions related to the performance of 3D printing concrete mixture, and puts forward the test methods for the key performance of 3D printing concrete mixture, such as extrudability, open time, buildability, green strength and elastic modulus. On the basis of fully considering the anisotropy of mechanical properties caused by extrusion stacking of 3D printed concrete, Test Methods of Mechanical Properties on 3D Printed Concrete defines the loading direction, specimen size and preparation requirements of 3D printed concrete mechanical properties test, and puts forward the test methods for interfacial splitting tensile and interfacial shear properties of 3D printed concrete. The two standards can guide the design of 3D printed concrete materials, the testing and evaluation of printability and mechanical properties, provide technical basis and standard guarantee for the engineering application and promotion of 3D printed concrete, and promote the healthy development of this technical field.