Mechanical Properties of Chopped Basalt Fiber-Reinforced Lightweight Aggregate Concrete and Chopped Polyacrylonitrile Fiber Reinforced Lightweight Aggregate Concrete

Abstract

In this study, an experimental investigation was conducted on the mechanical properties of lightweight aggregate concrete (LWAC) with different chopped fibers, including basalt fiber (BF) and polyacrylonitrile fiber (PANF). The LWAC performance was studied in regard to compressive strength, splitting tensile strength and shear strength at age of 28 days. In addition, the oven-dried density and water absorption were measured as well to confirm whether the specimens match the requirement of standard. In total, seven different mixture groups were designed and approximately 104 LWAC samples were tested. The test results showed that the oven-dried densities of the LWAC mixtures were in range of 1.819–1.844 t/m3 which satisfied the definition of LWAC by Chinese Standard. Additionally, water absorption decreased with the increasing of fiber content. The development tendency of the specific strength of LWAC was the same as that of the cube compressive strength. The addition of fibers had a significant effect on reducing water absorption. Adding BF and PANF into concrete had a relatively slight impact on the compressive strength but had an obvious effect on splitting tensile strength, flexural strength and shear strength enhancement, respectively. In that regard, a 1.5% fiber volume fraction of BF and PANF showed the maximum increase in strength. The use of BF and PANF could change the failure morphologies of splitting tensile and flexural destruction but almost had slight impact on the shear failure morphology. The strength enhancement parameter β was proposed to quantify the improvement effect of fibers on cube compressive strength, splitting tensile strength, flexural strength and shear strength, respectively. And the calculation results showed good agreement with test value.

Utilizing Polypropylene Fiber in Sustainable Structural Concrete Mixtures

“…In the present study, 6 different fiber volume fractions and 4 water-to-cement ratios were considered for the 30 mix designs. Cylindrical specimens with the dimensions of 100 mm × 200 mm (4″ × 8″) were cast and cured according to ASTM C192 [14]. A total number of 100 specimens including control samples were finally cast.…”

“…The flexural/shear response of concrete structural members is governed by the tensile response of the fibrous material, and the favorable characteristics of FRC play an important role in this. The addition of short polypropylene fibers in concrete as mass reinforcement primarily provides crack control by means of crack-bridging the tensile stress transfer capacity of the fibers across the crack surfaces [14]. Because of its beneficial cracking performance, PFRC has been shown to be a promising non-conventional reinforcement in concrete elements subjected to shear stresses and, under certain conditions, could convert brittle shear failures to ductile flexural failures [15].…”

Lakoagregatni Betoni Armirani Vlaknima

“…Табела 5 -Својства влакана [15,16,17,18,19,20,21,22] Table 5 -Properties of fibers [15,16,17,18,19,20,21…”

“…при затезању/Tensile strength; Ec -Модул еластичности/Elastic modulus; ρ -Специфична маса/Specific gravity; ε -Издужење при кидању/Ultimate elongation Табела 6 -Карактеристике влакана[17,20,23,21] …”

Effect of Short Fiber Reinforcements on Fracture Performance of Cement-Based Materials: A Systematic Review Approach

“… Carbon fibers used in CBMs. ( a ) Carbon nanotube [ 185 ], ( b ) Graphene [ 184 ], ( c ) Polyacrylonitrile [ 186 ]. …”