Abstract
Fibers of various origins are of great importance for the manufacture of new generation cement composites. The use of modified composite binders allows these highly efficient building materials to be used for 3D-printing of structures for various functional purposes. In this article, changes in building codes are proposed, in particular, the concept of the rheological technological index (RTI) mixtures is introduced, the hardware and method for determining which will reproduce the key features of real processes. An instrument was developed to determine a RTI value. The mixes based on composite binders and combined steel and polypropylene fibers were created. The optimally designed composition made it possible to obtain composites with a compressive strength of 93 MPa and a tensile strength of 11 MPa. At the same time, improved durability characteristics were achieved, such as water absorption of 2.5% and the F300 frost resistance grade. The obtained fine-grained fiber-reinforced concrete composite is characterized by high adhesion strength of the fiber with the cement paste. The microstructure of the developed composite, and especially the interfacial transition zone, has a denser structure compared to traditional concrete. The obtained materials, due to their high strength characteristics due to the use of a composite binder and combined fiber, can be recommended for use in high-rise construction.
Highlights
It is known that the performances of concrete products are significantly increased when they have dispersed reinforcement [1,2]
One of the modern effective concreting technologies, 3D printing, is in the efficient distribution of the concrete mixture according to the construction object scheme, and in ensuring high adhesion strength of the structural layers of the mixture, as well as the complete filling of the formwork volumes with high-density concrete [7,8]
For a numerical assessment of the degree of “printability”, it is proposed to introduce the concept of the rheological technological index of mixtures, the hardware and method for determining which will reproduce the key features of real processes
Summary
It is known that the performances of concrete products are significantly increased when they have dispersed reinforcement [1,2]. One of the modern effective concreting technologies, 3D printing, is in the efficient distribution of the concrete mixture according to the construction object scheme, and in ensuring high adhesion strength of the structural layers of the mixture, as well as the complete filling of the formwork volumes with high-density concrete [7,8]. The requirements of 3D building technologies are met by highstrength fine-grained concrete, which includes an aggregate containing fractions calculated taking into account the closest packing factor. This composite has high strength and high durability [9,10]. The main difficulty here is the operation of efficient filling of all pores with a plastic mixture [11,12]
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