Optimization of Mix Designs and Experimental Study of the Properties of Concrete Mix for 3D Printing

Carbon dioxide (CO2) is the reason of increasing the global warming resulting from human industrial activities, to reduce these emissions of CO2 there is a necessity for sequestration of CO2 into stable forms. The paper summarizes the mechanical properties of concrete when cured on CO2 that is by using CO2 chamber. The research includes designing a concrete mix of M25 and M30 grade as per IS 10262:2009. The experimental study on water cured and CO2 specimens for compression strength were carried out. The results show that for M25 and M30 grade of concrete has achieved increasing value as comparing with 7days of water curing and the duration of 4hour CO2 curing. For M25 grade of concrete has achieved 70% of compression strength and M30 grade of concrete has achieved 65% of compression strength in the duration of 4hours of CO2 cured specimens when compared to 28days of water cured specimens.

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COMPRESSIVE PROPERTIES OF AUXETIC STRUCTURES WITH CONTROLLED STIFFNESS OF STRUT JOINTS

Acta Polytechnica CTU Proceedings ◽

10.14311/app.2019.25.0017 ◽

2019 ◽

Vol 25 ◽

pp. 17-20

Author(s):

Tomáš Doktor ◽

Tomáš Fíla ◽

Petr Koudelka ◽

Daniel Kytýř ◽

Ondřej Jiroušek

Keyword(s):

Experimental Study ◽

3D Printing ◽

Cross Section ◽

Base Material ◽

Compressive Properties ◽

Entire Cross Section ◽

Static Compression ◽

Auxetic Structures ◽

Collapse Failure ◽

Quasi Static Compression

Presented paper deals with experimental study on compressive properties of auxetics with controlled stiffness of strut joints. The variable strut joints properties were simulated by adding extra amount of material in the struts’ intersection regions. Four groups of inverted honeycomb structures were prepared by multi-jet 3D printing and tested in quasi-static compression. The structure collapsed gradually, however after the first collapse, failure in entire cross-section occurred due to the brittle nature of the base material. The behavior up to the first collapse was consistent among the specimens within each group, while differed slightly subsequently. With higher reinforcement in the joints, results showed increasing stress at the first collapse (ultimate compressive stress) while the strain at the first collapse remained unchanged. The auxetic behaviour became less significant with increasing joints’ reinforcement.

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COMPRESSIVE PROPERTIES OF AUXETIC STRUCTURES WITH CONTROLLED STIFFNESS OF STRUT JOINTS

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