High-strength lightweight concrete with internal curing for 3D-printing in construction

Abstract

In the global information space there is a positive trend in the number of publications devoted to the technology of building 3D-printing. As functional additive for internal care of concrete superabsorbent polymer (SAP) can be used. It was found that the mobility of high-strength lightweight concrete mixtures with SAP is decreased in contrast to cement pastes. The decrease of the spread diameter of the concrete mixture with an increase of the SAP content to 2.3 % by weight of Portland cement is to 20 %. The SAP content of less than 1.5 % by weight of Portland cement provides the required mobility of the concrete mixture and the average density of high-strength lightweight concrete. Taking into account the requirements for the strength of the studied concrete, the optimal content of SAP is 1.0-1.5 % by weight of Portland cement. The efficiency of the use of solutions of superabsorbent polymers for reducing shrinkage deformations of the concrete in contrast to granular SAPs is proved. This is especially actual for concrete used in adverse hardening conditions of Portland cement, for example in 3D-printing in construction. It was shown that the concentration of SAP less than 1.5% by weight of Portland cement allows to ensure the mobility of the mixtures and preservation of concrete strength.