The Microstructure-Mechanical Properties of Hybrid Fibres-Reinforced Self-Compacting Lightweight Concrete with Perlite Aggregate

Abstract

The purpose of this paper is to determine the influence of the lightweight porous perlite aggregate and two widely used types of fibres on the physical and mechanical properties, frost durability and microstructure of self-compacting lightweight concrete (SCLC). The experimental investigation consisted of tests carried out on cubes and prismatic samples made of SCLC and fibres-reinforced SCLC with variable content ranging from 0.5 to 1% of basalt fibres (BF) and/or 0.5% of steel fibres (SF). In this study, two variable contents of fine perlite aggregate were used: 5% and 15%. The workability (the slump-flow and t500 values) in fresh state SCLCs have been done. Extensive data on compressive and flexural tensile strength in bending behaviour, frost resistance and the microstructure including interfacial transition zone (ITZ) were recorded and analysed. The hybrid fibres-reinforced SCLC with perlite aggregate showed a more ductile behaviour compared to that of SCLC without fibres. Fibres bridge cracks during flexural tensile strength test. BF successfully protected porous SCLC against frost attack, whereas SF succumbed to damage.

Properties of Fibrous Concrete Made with Plastic Optical Fibers from E-Waste

“…The relationship between those two parameters can be described by the polynomial second-order model, with the determination coefficient being equal to 0.866. The results for water absorptivity indicate the increased porosity of the mixtures due to the application of fibers, especially steel ones, which was demonstrated by other researchers [64] in studies on concretes supplemented with steel and basalt fibers. The authors of [64] showed that lower fiber-reinforced concrete strength should be combined with a two-fold increase in air content in this The results for water absorptivity indicate the increased porosity of the mixtures due to the application of fibers, especially steel ones, which was demonstrated by other researchers [64] in studies on concretes supplemented with steel and basalt fibers.…”

“…The results for water absorptivity indicate the increased porosity of the mixtures due to the application of fibers, especially steel ones, which was demonstrated by other researchers [64] in studies on concretes supplemented with steel and basalt fibers. The authors of [64] showed that lower fiber-reinforced concrete strength should be combined with a two-fold increase in air content in this The results for water absorptivity indicate the increased porosity of the mixtures due to the application of fibers, especially steel ones, which was demonstrated by other researchers [64] in studies on concretes supplemented with steel and basalt fibers. The authors of [64] showed that lower fiber-reinforced concrete strength should be combined with a two-fold increase in air content in this mix, as well as higher open porosity in the hardened concretes.…”

“…The authors of [64] showed that lower fiber-reinforced concrete strength should be combined with a two-fold increase in air content in this The results for water absorptivity indicate the increased porosity of the mixtures due to the application of fibers, especially steel ones, which was demonstrated by other researchers [64] in studies on concretes supplemented with steel and basalt fibers. The authors of [64] showed that lower fiber-reinforced concrete strength should be combined with a two-fold increase in air content in this mix, as well as higher open porosity in the hardened concretes. Another study showed that highest porosity and absorptivity were observed in the cement mortars with the highest amounts of basalt fibers (1.5%), which were 29% and 56% higher than in standard mortar, respectively [65].…”

Surface Modification of Lightweight Mortars by Nanopolymers to Improve Their Water-Repellency and Durability

“…Table 6 presents the results of the durability and physical properties of mortars. Numerous studies confirming the influence of expanded perlite on the physical properties of cement composites are known in the literature [63][64][65][66] Analyzing the results, it can be unequivocally stated that the replacement of natural aggregate with expanded perlite reduces the density of mortars, which decreases as the number of perlite increases. This is due to the low specific gravity of perlite and high porosity of aggregate, which contributes to increasing the porosity of ready-mixed mortars.…”

Strength characteristics of foam concrete samples with various additives

“…Widespread use of nano-modified and mineral additives are in the various concretes compositions [7][8][9]. There is an active research of the modifying additives effect on shrinkable deformations of the foam concrete mix [10], as well as on density in normal moisture content conditions, on compressive strength and tensile strength during bending of cement composites [11][12][13], is being conducted.…”