Mechanochemical Activated Fly Ash Concrete Suitable for 3D Printing

The article shows the possibility of obtaining fine-grained concrete mixtures and concretes using mechanochemical activated cement-ash binders, which can be used as working mixtures for a 3D printer. The choice of raw materials solve the problem of resource and energy saving, provided that man-made waste is used. Using mathematical planning of experiments, a complex of experimental and statistical models of compressive and tensile strength at the age of 1 day and 28 days describing the influence of factors was obtained. It has been studied that the minimum required compressive strength of a multilayer structure at the age of 1 day is at least 3.0 MPa, which can be achieved by using Portland cement at 10…15% from mass of cement-ash binders and hardening activator at least 2%. The 28-day compressive strength of the concrete is more than 30 MPa. The tensile strength at the age of 28 days is 3.0…5.0 MPa will provide sufficient adhesion between the layers.