Abstract
Currently, 3D concrete printing attracts worldwide attention due to its digital-construction advantages, meanwhile, the problems of pollution caused by construction and demolition waste as well as the shortage of river sand become more and more serious. Based on it, this research tries to verify the printability of 3D printing mortar with 100% recycled sand by assessing its fluidity, extrudability, printability window, and green strength. Result shows that, when additional and suitable sodium gluconate is added into the printing mortar with 100% recycled sand, this mortar can not only meet the printability requirements of 3D printing, but also obtain a longer printability window and a higher green strength than the mortar with 100% natural sand, which is beneficial for the practical application of 3D concrete printing.
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