scholarly journals Nanomodification of Lightweight Fiber Reinforced Concrete with Micro Silica and Its Influence on the Constructive Quality Coefficient

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7347
Author(s):  
Evgenii M. Shcherban’ ◽  
Sergey A. Stel’makh ◽  
Alexey Beskopylny ◽  
Levon R. Mailyan ◽  
Besarion Meskhi ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Strength Characteristics ◽  
Structural Quality ◽  
Fiber Reinforced ◽  
Modifying Additives ◽  
Quality Coefficient ◽  
Design Characteristics ◽  
Micro Silica ◽  
Modifying Additive

A hypothesis was put forward that a nano-modifying additive of micro silica, which had a beneficial effect on achieving a perfect structure of heavy concrete, can also be effectively used in lightweight fiber-reinforced concrete. The nano-modifying additives of micro silica application in manufacturing lightweight fiber reinforced concrete products and structures can significantly enchain their strength characteristics without increasing their mass and consequently improve their design characteristics. The purpose of the work was to increase the structural quality coefficients for all types of strengths of lightweight fiber-reinforced concrete due to its modification with micro silica. The effect of nano-modifying additives of micro silica on the strength characteristics of lightweight fiber reinforced concrete was studied. The optimal amount of micro silica addition was experimentally confirmed and established of 10% of the cement mass. The coefficients of constructive quality for all experimentally determined strength characteristics of lightweight fiber-reinforced concrete modified with micro silica additives were calculated. The coefficient of constructive quality for tensile strength in bending of lightweight fiber reinforced concrete with additives was two and a half times higher than that of heavy concrete without additives and up to 37% higher than that of lightweight fiber-reinforced concrete without additives.

scholarly journals Optimization of Composition and Technological Factors for the Lightweight Fiber-Reinforced Concrete Production on a Combined Aggregate with an Increased Coefficient of Structural Quality

2021 ◽  
Vol 11 (16) ◽  
pp. 7284
Author(s):  
Levon R. Mailyan ◽  
Alexey N. Beskopylny ◽  
Besarion Meskhi ◽  
Sergey A. Stel’makh ◽  
Evgenii M. Shcherban ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Fiber Reinforced Concrete ◽  
Structural Quality ◽  
Deformation Characteristics ◽  
Fiber Reinforced ◽  
Distribution Method ◽  
Concrete Production ◽  
Strength And Deformation ◽  
Control Composition

In recent years, developing lightweight concrete with both the necessary and sufficient strength characteristics is essential in the construction industry. This article studies the influence of the volumetric composition of lightweight fiber-reinforced concrete (LFRC) and the method of its distribution during the preparation of the fiber–concrete mixture on the strength and deformation characteristics of LFRC on a combined aggregate. The optimal grain size of the porous filler was calculated by the mathematical planning method of the experiment. Regression models of the strength and deformation characteristics on the volumetric content of fiber and its distribution method were obtained. The most effective combination of these factors has been determined. The model shows that the increase in compressive strength was 12%, the value of the prismatic strength increased by 25%, the bending tensile strength increased by 34%, and the axial tensile strength increased by 11%. The ultimate strains during axial compression decreased by 10%, axial tension decreased by 12%, and the elasticity modulus increased by 11% compared to the test results of the control composition samples without fiber and pumice. The coefficient of constructive quality (CCQ) of the LFRC on a combined aggregate compared to concrete with the control composition without fiber and pumice showed an increase of more than 32%. It was also found that fiber reinforcement with basalt fibers with a combination of heavy and porous aggregates achieves a synergistic effect together.

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