3D printed concrete leaves a large number of weak interfaces due to the “layer by layer stacking”, resulting in strength anisotropy and limited overall reliability.
Professor Zhang Yuanyuan from Shenzhen University and Zhang Guangzhu from Northeast Forestry University proposed the strategy of “in-situ filling of algae bacteria for carbonation regulation” – loading spirulina and carbonate producing Bacillus into porous ceramic particles, sprinkling them into printing mortar, and then curing with rich CO2 to allow calcite to “grow” in weak interfaces, resulting in a synchronous increase in bonding strength and directional homogeneity.
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