Fiber Concrete for 3-D Additive Technologies

Abstract

fine-grained fiber concrete used in 3D printing is significantly different from conventional heavy concrete, which is determined by the increased consumption of cement, low water-cement ratio and the absence of large aggregates. The largest grain size of fine aggregate is selected taking into account the thickness of the section, the frequency and type of reinforcement, as well as the method of concrete placement. Despite the fact that the tensile strength of concrete on fine sand is more than 1.5 times higher than the strength of concrete on coarse sand, while there is a decrease in compressive strength. Due to the peculiarities of the technology of concrete manufacturing for layering, the use of coarse sands is impractical, and therefore it was decided to use quartz sand with a particle size module of 1.12 as a filler.

Explanatory investigation of the device for regulating the vertical position of a building

“…Experimental studies were carried out in order to determine the influence of the loading level, sand moisture and composition of sand for efficiency of the proposed device [26][27][28][29][30] It has been established that with a multistage alignment of 3-6 cm, a reduction in effort is observed at each stage of the study by 30-60%. Thus, the operation of the device when the precipitate for 3-6 cm for each phase equalization leads to gradual reduction in the effort.…”

Soil-concrete for use in the 3D printers in the construction of buildings and structures

“…Without the accelerator, the spread of the cone is approximately 170 mm. Thus, the introduction of the certain previously unknown amount of clay soil should later lead to spread of the cone to the required values of 115 ... 125 mm [29][30][31][32].…”

Fine-grained concrete with combined reinforcement by different types of fibers

“…In some cases, it is advisable to use lightweight concrete. The type of concrete determines the nature of the rational type of dispersed reinforcement and the optimal values of the geometric parameters of the dispersed reinforcement [9][10][11][12][13][14][15].…”