STRENGTH AND DEFORMABILITY OF BASALT FIBER-REINFORCED CONCRETE

Аннотация

INTRODUCTION basalt fiber remains higher over time than that of Concrete reinforced with basalt fiber exhibits concrete without basalt fiber. The analysis results higher strength compared to concrete without show that regardless of the testing method, the basalt fiber. Tests were conducted to determine compressive strength of basalt fiber-reinforced the nature of the change in strength of basalt fiber- concrete is on average 30-40% higher than that of reinforced concrete over time. Samples prepared concrete without basalt fiber. for testing consisted of two types of materials: concrete cubes with basalt fiber and concrete The highest value of the modulus of deformation cubes without basalt fiber. Tests were conducted was observed in 28-day samples of concrete with over periods of 28, 90, 180, and 360 days. The most basalt fiber. In tests conducted after 90 days, the rapid increase in the strength of basalt fiber- modulus of deformation for basalt fiber-reinforced reinforced concrete was observed in the period up concrete increased by 17%, while the modulus of to 28 days. However, the subsequent strength deformation for concrete without basalt fiber increase was greater in the samples with basalt remained nearly unchanged (Table 2). This fiber than in the samples without it. The difference behavior is related to the curing dynamics of basalt in strength between samples with and without fiber-reinforced concrete. In the initial stage, the basalt fiber after 28 days ranged from 17-41% intensity of curing and the effect of high after one year compared to the 28-day strength. temperature accelerate cement hydration, which hinders the increase in the modulus of Based on the test results, the compressive strength deformation. Research indicates that the reduction of concrete with basalt fiber is higher than that of in the modulus of deformation of samples with concrete without basalt fiber. As can be seen from compressive strength of 16.0 MPa does not exceed Table 1, the compressive strength of concrete with 24-13-11%. https://www.theamericanjournals.com/index.php/tajet 164 THE USA JOURNALS THE AMERICAN JOURNAL OF ENGINEERING AND TECHNOLOGY (ISSN – 2689-0984) VOLUME 06 ISSUE10 The following formula is recommended for fiber-reinforced concrete: determining the modulus of deformation of basalt  = 3130* p*3 R * в B (1) Here: • R - the average density of concrete, t/m³; • R - the cubic strength of concrete, MPa; • BB - the coefficient accounting for the reduction in strength of basalt fiber-reinforced concrete under normal conditions. Figure 1. Elasticity Coefficient of Basalt Figure 2. Ultimate Compressibility of Fiber-Reinforced Concrete Basalt Fiber-Reinforced Concrete • x - Without basalt fiber • Δ - With basalt fiber The change in the cubic strength of basalt fiber-reinforced concrete and concrete without basalt fiber over time. Table 3.1. № Condition The cubic compressive strength of The work condition coefficient of Recomended basalt fiber-reinforced concrete basalt fiber-reinforced concrete at пп of storage value (MPa) over time (in days) is as various times is as follows: follows: https://www.theamericanjournals.com/index.php/tajet 165 THE USA JOURNALS THE AMERICAN JOURNAL OF ENGINEERING AND TECHNOLOGY (ISSN – 2689-0984) VOLUME 06 ISSUE10 28 60 90 180 360 28 60 90 180 360 1. Basalt 24.2 24,9 25,2 25,9 26,5 fiber- ------ ----- ------ ----- ----- - - - - - - reinforced 135 139 141 145 148 Non- 2. reinforced 17,9 18,4 19,1 19,69 20,2 (without ----- ----- 5 ------ ------ 1,35 1,34 1,31 1,31 1,3 1,3 basalt 100 103 ----- 110 - fiber) 107 113 The preparation time of basalt fiber-reinforced concrete affects its strength and deformation properties. Table 2. The age of Volume weight Condition of concrete in (kg/m³) R, R, Е в в storage days. MPa MPa К МPa 10-5 вс вс Basalt fiber- 28 2410 16,5 13,7 0,83 13000 190 reinforced 60 2405 18,8 14,0 0,78 13800 194 90 2390 18,6 14,3 0,76 15300 197 180 2390 20,7 15,4 0,74 15800 208 360 2390 23,2 16,8 0,72 16100 215 28 2340 17,9 14,1 0,78 12400 205 60 2320 18,1 14,2 0,78 12500 205 Non-reinforced 90 2300 18,3 14,4 0,78 12500 241 (without basalt 180 2280 19,04 14,9 0,78 13200 237 fiber) 360 2280 20,8 15,2 0,74 14000 259 concrete samples without basalt fiber. The value of this coefficient is determined by the following formula: Where: For calculating reinforced concrete structures made from basalt fiber-reinforced concrete, . • - Modulus of deformation of basalt fiber-reinforced concrete samples; Change in Ultimate Compressibility of Basalt Fiber- Reinforced Concrete • - Modulus of deformation of Table 3 т/р Curing conditions The change in the ultimate compressibility of basalt fiber-reinforced concrete under normal conditions. 28 60 90 180 360 1 Basalr fiber-reinrorced 196 202 209 227 236 https://www.theamericanjournals.com/index.php/tajet 166 THE USA JOURNALS THE AMERICAN JOURNAL OF ENGINEERING AND TECHNOLOGY (ISSN – 2689-0984) VOLUME 06 ISSUE10 2 Non-reinforced basalt 202 210 2