Glass Fiber Concrete Research Articles

Mechanical Properties and Microscopic Study of Recycled Fibre Concrete Based on Wind Turbine Blades.

In recent years, wind energy has begun to receive a significant amount of attention as clean energy is utilised and demanded in large quantities, resulting in a sharp increase in the use of wind turbines. The demand for wind turbines has gradually risen due to the clean and recyclable nature of wind energy. The current blade life of wind turbines in China is about 20 years, which means that the disposal of obsolete used blades can become a difficult problem in the future. Therefore, this study is of great significance to explore the regeneration performance of the blades after recycling and disposal. In this paper, wind turbine blades were mechanically recycled into recycled macrofibres, which were added to concrete as a reinforcing material to make wind impeller fibre concrete (WIC), and the three proportion ratios of 1%, 1.5%, and 2% were explored to compare the performance. The performance of WIC was also evaluated and its performance was compared to that of glass fibre concrete (GC). In addition, the material physical properties of second-generation recycled aggregate concrete (RAC) based on WIC were explored. The strength and peak strain variations and their causal mechanisms were analysed both macroscopically and microscopically by means of the classical mechanical tests (compression and bending tests), SEM, and XRD. The results show that the compressive strength of WIC was negatively correlated with the fibre content and increased by 6.04-18.12% compared to that of ordinary concrete (OG), with a maximum of 19.25 MPa; the flexural strength was positively correlated with the fibre content, with an increase of 5.37-18.5%. The microstructural analysis confirmed the macroscopic results and the intrinsic model better validated the experimental results.

Performance Evaluation of Self-Compacting Glass Fiber Concrete Incorporating Silica Fume at Elevated Temperatures

In this work, the properties of self-compacting concrete (SCC) and SCC containing 0.5 and 1% glass fibers (with lengths of 6 and 13 mm) were experimentally investigated, as well as their performance at high temperatures. With a heating rate of 5 °C/min, high-temperature experiments were conducted at 200, 400, 600, and 800 °C to examine mass loss, spalling, and the remaining mechanical properties of SCC with and without glass fibers. According to the results of the flowability and passing ability tests, adding glass fibers does not affect how workable and self-compacting SCCs were. These findings also demonstrated that the mechanical properties of samples with and without glass fibers rose up to 200 °C but then decreased at 400 °C, whereas the mixture containing 0.5% glass fibers of a length of 13 mm displayed better mechanical properties. Both SCC samples with and without glass fibers remained intact at 200 °C. Some SCC samples displayed some corner and edge spalling when the temperature reached about 400 °C. Above 400 °C, a significant number of microcracks started to form. SCC samples quickly spalled and were completely destroyed between 600 and 800 °C. According to the results, glass fibers cannot stop SCC from spalling during a fire. Between 200 and 400 °C, there was no discernible mass loss. At 600 °C, mass loss starts to accelerate quickly, and it increased more than ten times beyond 200 °C. The ultrasonic pulse velocity (UPV) of SCC samples with glass fibers increased between room temperature and 200 °C, and the mixture containing 0.5% glass fibers of a length of 13 mm showed a somewhat higher UPV than other SCC mixtures until it started to decline at about 400 °C.

Examining Mechanical Property Differences in Concrete with Natural and Synthetic Fiber Additives

The rapid growth of Natural Fiber Laminate (NFL) innovation is a direct response to environmental challenges, positioning these materials as superior alternatives to synthetic fiber composites. This paper delved into the outcomes of an extensive experimental study investigating the influence of sisal fiber (SLF), banana fiber (BF), and glass fiber (GF) on the mechanical and microstructural characteristics of concrete. The water absorption curves were established for sisal fiber concrete (SLFC), banana fiber concrete (BFC), and glass fiber concrete (GFC). Furthermore, Scanning Electron Microscope (SEM) observations were conducted to perform microanalysis and failure analysis of the tested specimens. The results revealed significant improvements in the concrete containing fibers compared to its counterpart in fiber-free concrete. For mixtures with a water-to-binder (W/B) ratio of 0.3, the most optimal mix (GF-30-135) showed improvements in compressive strength, flexural strength, and splitting tensile strengths by 4.13%, 8.93%, and 10.10%, respectively. On the other hand, for W/B of 0.4, mix GF-30-135 showed improvements of 5.05%, 8.55%, and 11.60%, respectively. Furthermore, as the fiber content increased, microscopic analyses revealed a weakening of the bond between the fibers and the rest of the matrix, contributing to the deterioration of the mechanical properties.

Optimisation of Mechanical Characteristics of Alkali-Resistant Glass Fibre Concrete towards Sustainable Construction

Concrete is a worldwide construction material, but it has inherent faults, such as a low tensile strength, when not reinforced with steel or other forms of reinforcement. Various innovative materials are being incorporated into concrete to minimise its drawbacks while concurrently improving its dependability and sustainability. This study addresses the research gap by exploring and enhancing the utilisation of glass fibre (GF) concerning its mechanical properties and reduction of embodied carbon. The most significant advantage of incorporating GF into concrete is its capacity to reduce the obstruction ratio, forming clusters, and subsequent material solidification. The study involved experiments wherein GF was incorporated into concrete in varying proportions of 0%, 0.5%, 0.75%, 1%, 1.25%, 1.50%, 1.75%, and 2% by weight. Mechanical tests and tests for durability were conducted, and Embodied carbon (EC) with eco-strength efficiency was also evaluated to assess the material’s sustainability. The investigation found that the optimal percentage of GF to be used in concrete is 1.25% by weight, which gives the optimum results for concrete’s mechanical strength and UPV. Adding 1.25% GF to the material results in increases of 11.76%, 17.63%, 17.73%, 5.72%, and 62.5% in C.S, STS, F.S, MoE, and impact energy, respectively. Concrete blended with 1.25% of GF has the optimum value of UPV. The carbon footprint associated with concrete positively correlates with the proportion of GF in its composition. The optimisation of GF in concrete is carried out by utilising the response surface methodology (RSM); equations generated through RSM enable the computation of the effects of incorporating GF in concrete.

Strengthening of AR Glass Fibre Concrete by Using Dunite Powder

Abstract: In the contemporary era. Concrete, the most significant and frequently used material, frequently needs to have a very high strength and acceptable workability. Research on glass fibre reinforced concrete led to the development of alkali resistant fibres with a high capacity for dispersion, increasing long-term durability. When dunite is utilised as a cement alternative rather of regular cement, concrete is discovered to become up to 40% stronger. Studies based on periodic cement rate data show that, on average, dunite powder is less expensive than cement. Future cement usage will be dominated by the replacement of dunite powder. In the current experimental investigation, alkali resistant glass fibres have been employed to investigate the effect on compressive and split tensile strength on M30 grade of concrete can be determined for 28,56 and 90 days

Mechanical Properties AR Glass Fibre Concrete by Using Dunite Powder

Abstract: In the modern world. The most significant and commonly utilised material, concrete, must frequently have a very high strength and appropriate workability.Alkali resistant fibres with a high capacity for dispersion were created as a consequence of research in glass fibre reinforced concrete, which increased long-term durability.Alkali resistant glass fibres have been used in the current experimental examination to explore the impact on compressive and split tensile strength on M30 grade of concrete.Concrete is found to become up to 40% stronger when dunite is used as a cement substitute rather than conventional cement.Test can be carried for 7 and 28 days. Studies based on periodic cement rate records indicate that the dunite powder is less expensive than cement, on average. The substitution of dunite powder will predominate in cement consumption in the future. It enhances, among other things, Split tensile strength, compressive strength.

Research of technical characteristics of glass-fiber concrete

The article examines the technical characteristics of glass fiber reinforced concrete based on experimental research and selection of the optimal composition of fiber reinforced concrete. When selecting the composition, various technologies for introducing fibers, the percentage of fibers introduced, and the characteristics of the sand used were analyzed. The obtained research results allow us to determine the effectiveness of the use of glass fiber reinforced concrete structures in the reconstruction of buildings and structures. In the manufacture of test samples, materials of domestic production were used.

Mechanical and Durability Performances of Alkali-resistant Glass Fiber-reinforced Concrete

Concrete, being the most widely used construction material in the world, lacks strength in direct tension and flexure. Attempts to reinforce concrete in tension include the use of steel rebars to strengthen the tensile side of concrete as well as the use of discrete fibers as a reinforcing medium. The study conducted in this manuscript details the effects of including alkali-resistant glass fibers in concrete. Mechanical strength, such as strength in compression and flexure, chord modulus of elasticity and bond pull-out strength, have been measured along with porosity and resistance to accelerated carbonation. Five different water to binder ratios in a range of 0.4 to 0.6 had been used to prepare the design mix proportions. The optimum fiber dosage was found to be 1.5% by weight of cement used. The same had been adopted in the design mix proportions. The average increase in compressive strength and flexural strength was 13% and 28%, respectively. Alkali-resistant glass fiber concrete showed less resistance to carbonation when compared to control mix. Results indicate that glass fibers play a predominant role in providing flexural strength to concrete. The pull-out strength of fiber was added to extra post-cracking flexural strength. The inclusion of alkali-resistant glass fibers imparted a maximum addition of 44% increase in the flexural strength compared to control concrete. The inclusion of alkali-resistant glass fibers in concrete paves the way for a leaner mix and eradicates the possibility of congestion of steel reinforcement for certain structures. KEYWORDS: Alkali-resistant glass fibers, Accelerated carbonation, Bond strength, Compressive strength, Flexural strength.

Structural performance of prefabricated glass fibre concrete floor panel versus compressed fibre cement floor panel for an optimised volumetric module- A case study

Efficient design with an adequate selection of materials plays a significant role in the serviceability and durability of the volumetric modules in modular construction. Literature and experience indicate that the design life of the volumetric module is heavily dependent on its floor's serviceability. Improper design along with an inadequate selection of material for the floor of the volumetric module can lead to damages to the other structural and non-structural elements such as walls and services etc. This paper aims to present the sustainable, optimised and serviceable structural design for the floor of a volumetric module. A common volumetric module of the modular industry, i.e., a prefabricated bathroom pod is taken as an example to demonstrate the efficacy of sustainable Glass Fibre Concrete (GRC) over the existing Compressed Fibre Cement (CFC) system. The structural analyses and design were carried out using finite element modelling and optimization through Design for manufacture and assembly (DfMA) computations in the current research. The entire modules with GRC and CFC floor panels were subjected to various loading conditions in the numerical models to compare their serviceability. The outcomes of the models revealed the better performance of GRC material over the CFC for the floor of the prefabricated bathroom pod. Moreover, through Design for Assembly (DfA) computations the efficiency in the manufacturing of the module with GRC was proposed. Furthermore, statistical models for the prediction of deflections of the floors and their correlation were developed.

Behavior of GFRP bar-reinforced hollow-core polypropylene fiber and glass fiber concrete columns under axial compression

This study experimentally investigated the behavior of glass fiber-reinforced polymer (GFRP) reinforced hollow-core concrete specimens under concentric axial compression. The effect of the type of concrete (non-fibrous concrete, i.e., normal concrete without the addition of fibers; polypropylene fiber concrete; and glass fiber concrete) and pitches of the GFRP helices on the behavior of GFRP bar-reinforced hollow-core concrete specimens were investigated. The experimental program consisted of seven circular hollow-core specimens with an outer diameter of 214 mm, an inner circular hole diameter of 56 mm, and a height of 850 mm. The failure modes, axial load carrying capacity, and ductility of GFRP bar-reinforced hollow-core concrete specimens were investigated. The experimental results showed that, for a similar amount of reinforcement, the GFRP bar-reinforced hollow-core polypropylene fiber concrete (GFRP–HC–PFC) specimen achieved 2% higher maximum axial load and 19% higher ductility than the GFRP bar-reinforced hollow-core non-fibrous concrete (GFRP–HC–NFC) specimen. For a similar amount of reinforcement, the GFRP bar-reinforced hollow-core glass fiber concrete (GFRP–HC–GFC) specimen achieved 14% lower maximum axial load but 9% higher ductility than the GFRP–HC–NFC specimen. The axial load carrying capacity and ductility of the specimens enhanced with the close pitch of the GFRP helices. A simplified equation was developed for GFRP bar-reinforced hollow-core concrete columns, which predicted the axial load capacity of the specimens with reasonable accuracy.

Experimental Study of Elevated Temperature Effects on Properties of Nano Clay and Glass Fiber Concrete

Concrete is mostly use construction material. Concrete is composite material composed of fine and coarse aggregate bonded together with a cement paste that cure over time. Generally concrete is strong in compression and weak in tension. Concrete is brittle material and will crack when we increasing tensile force. Nano clay are nano-size particles of layered mineral silicates. Adding a nano clay is a could fill the original hydration products pores and colloid capillaries increase the cement paste density of concrete. Alkali-resistant glass fiber has a high degree of corrosion resistance in the environment of cement and other alkaline medium. Glass fiber gives high tensile strength. Objective of research is increase mechanical strength of concrete with use of nano clay (NC) and glass fiber (GF). In present study, Concrete grade use is M30.In study 2% of NC is fix replacement of cement and variation of GF is use 0.5%,1%,1.5% as admixture. Temperature effect give 80℃,180℃,300℃for 3 hours. After adding NC and GF check the difference test result like a slump, Compressive, split tensile and flexural strength test. The specimens will be tested on 3,7, and 28 days.

Application of Glass Fiber Concrete under Thin-Walled Middle Partition Wall Construction in Tunnel

Aiming at the feasibility of applying glass fiber concrete as a new material to tunnel engineering, with the help of a combination of theoretical analysis, laboratory tests and engineering applications, the effect of glass fiber on the mechanical properties of concrete under different dosages and different lengths is studied. By monitoring the cracks in the middle partition wall, and applying the glass fiber to the middle partition wall in Laoshan Tunnel, to achieve the verification of the optimal length and the optimal mixing amount. The main conclusions are: (1) When the length of glass fiber is 12 mm, the tensile and compressive strength reach the maximum value; (2) Determine the optimal volume rate is 1% in order to prevent the concrete cracking effectively; (3) The crack resistance of the mid-board with glass fiber concrete is better than the ordinary concrete, which proves the feasibility of practical application of glass fiber concrete.

Behavior of conventional and fibered concrete shear walls during earthquake, an analytical simulation in SAP2000

The investigation of this paper was about non-liner behavior of shear walls against seismic wave by using conventional and fibered concrete. Case of earthquake study was Iripina 1980, Italy with Ms = 6.9 and fourth kind of shear walls with glass fiber, basalt fiber, steel fiber concrete and conventional concrete shear walls simulated in SAP2000 with dynamic analysis method. Analysis shows that glass fiber concrete and conventional concrete shear walls had similar behavior, also these shear walls had more suitable response. All shear walls behavior were same at the beginning of earthquake but at the end of earthquake basalt and steel fiber concretes had a lot of displacement. Furthermore, behavior of steel fiber concrete shear wall could not return at the last moments of earthquake. Beside modulus of elasticity and compressive strength had most effect on reaction of shear walls such that modulus of elasticity was the cause of doing linear behavior of shear walls during all times of earthquake, on the other hand compressive strength had most efficiently in dissipation energy. Best result in earthquake was with conventional concrete due to modulus of elasticity and compressive strength.

A study on alkali resistant glass fibre concrete and its exposure to elevated temperatures

Purpose: Cement concrete is characterized as brittle in nature, the loading capacity of which is completely lost once failure is initiated. This characteristic, which limits the application of the material, can in one way be overcome by the addition of some small amount of short randomly distributed fibers (steel, glass, synthetic). Design/methodology/approach: The present study deals with the inclusion of alkali resistant glass fibers in concrete by percentage weight of cement. The mechanical properties such as compressive strength and split tensile strength have been studied after exposing the concrete samples to elevated temperatures of up to 500°C. Water binder ratios of 0.4, 0.45, 0.5, 0.55 and 0.6 have been used to prepare design mix proportions of concrete to achieve a characteristic strength of 30 MPa. The depth of carbonation post elevated temperature exposure has been measured by subjecting the concrete samples to an accelerated carbonation (5%) condition in a controlled chamber. Findings: Conclusions have been drawn in accordance to the effect of fiber replacement and temperature increment. The concrete mixes with fiber content of 1% by weight of cement had shown better strength in compression and tension compared to the other dosages and conventional concrete (without fiber). Microcracking due to internal stream pressure reduced the mechanical strengths of concrete at elevated temperatures. Also, from TGA it was observed that the amount of calcium carbonate in samples with fiber added, post carbonation was less than the mixes without fiber in it. Research limitations/implications: The present study has been limited to alkali resistant glass fibers as the conventional glass fibers undergo corrosion due to hydration. Practical implications: The glass fiber reinforced concrete can be used in the building renovation works, water and drainage works, b ridge and tunnel lining panels etc. Originality/value: Based upon the available literature, very seldom the studies are addressing the behaviour of alkali resistant glass fiber concrete and its exposure to elevated temperatures.

ОПТИМИЗАЦИЯ СТРУКТУРЫ ПОЛА ПРОМЫШЛЕННОГО ЗДАНИЯ

When determining the design of the floor, choosing materials and technology of its device, it is advisable to apply a systematic approach that takes into account its stress-strain state. The physical model of the floor of an industrial building in a simplified form is represented as a two-layer slab on an elastic base. The physical model of the floor of an industrial building in a simplified form is represented as a two-layer slab on an elastic base. The deformation of the ground base is inherent in the stress-strain state of the structure, which is manifested through geometric and mechanical characteristics, boundary conditions., glass fiber concrete is proposed as a coating material. It provides the compressive strength inherent in concrete and a proper crack resistance. The mathematical model is based on the S. Germain equation and the Winkler dependence. When solving the optimization problem in a linear elastic formulation, the criterion of the minimum potential energy of deformation is used, which leads to a minimum of material consumption. Its effectiveness is confirmed by comparing the results on a variational basis with the analysis of the regression equation. The modulus of longitudinal elasticity and the thickness of the layer are accepted as variable parameters. The calculation procedure uses a finite-difference analog of the mathematical model. A two-factor experiment is conducted to complete the study, the results of which are in good agreement with the theoretical calculations performed.

Eco-friendly Hybrid Concrete Using Pozzolanic Binder and Glass Fibers

Hybrid Concrete focused on development of buildings, highways, and other structures of civil engineering. In the current study, various mix combinations have been prepared and tested with different percentages of super-plasticizer at different levels of water reduction for obtaining the optimum mix. Further, study on different properties of hybrid concrete and replacement of ordinary portland cement (OPC) with ground granulated blast furnace slag (GGBFS), silica fume (SF) and glass fibers (GF) for obtaining highly cement replaced concrete (HCRC) and glass fiber concrete (GFC). The concrete performance was evaluated based on slump cone test, compressive strength test, split tensile strength test, flexural strength test, water absorption test and ultrasonic pulse velocity test. It was observed from the results that, the best performance of HCRC achieved at 50% GGBFS and 3% silica fume replacement. Further, in the case of GFC, 0.2% of glass fibers showed high performance in terms of split tensile and flexural strength at all ages. The optimized concrete mixtures like HCRC and GFC performed better than the control concrete (CC).

Effect of high temperature on the strength and thermal conductivity of glass fiber concrete

This research selected a water-cement ratio of 0.5 and a slump of 18 cm for an ACI mix design, and used 0.60 and 2.54 cm glass fibers of 0.5%, 1.0% and 1.5% of cement by weight, respectively, to discuss the effect of one hour high temperature (440, 500, 580, 800 and 1000 °C) on the compressive strength and thermal conductivity of concrete. The results show that the additional amount of glass fibers used for enhancing the compressive strength of the concrete should be appropriate. When short glass fiber is added to concrete, the flexural strength of concrete will be reduced when the amount of fiber is too large; when the length of glass fiber added to concrete is long enough, the flexural strength of concrete will increase with the increase of the amount of fiber. Under the effect of high temperature, the residual compressive strength of concrete increases with the amount of glass fibers added and increases with the glass fiber length. The thermal conductivity is lower than the concrete of the control group; the decrement increases with the amount of glass fibers added and increases with the glass fiber length. Temperatures of 400–500 °C have the greatest effect on the decrease of thermal conductivity. Temperatures of 500–580 °C have the second greatest effect on the decrease in thermal conductivity.

Mechanical Properties of Glass Fiber Concrete with Different Dosages of Glass Fiber

Conventional concrete i.e. the concrete generally has low tensile strength with limited ductility and low resistance towards cracking. The micro cracks that are developed internally are inherent among concrete and can be explained with the help of propagation of that micro cracks due to its inferior tensile strength. Different fibers, added at a certain percentage of concrete known to improve the deformation properties of concrete along with the plasticity against crack resistance, such as flexural strength. Mainly concrete & ferroconcrete research has been moved to steel fibers, and glass fibers have recently become more available, with no corrosion problems associated with glass fibers. This article describes an experimental study of the usage of glass fibers in the structural concrete. High-dispersion CEM-FILL fiberglass of 14 μm diameter with an aspect ratio of 857 was used at a dosage of 0.33% to 1% by weight in concrete and its mechanical properties such as compressive strength, flexural strength and modulus of elasticity.

Experimental analysis on supplementary cementitious materials with Alkali Resistant glass fibers

In this work, cement is partially replaced by mineral admixtures like fly ash, ground granulated blast furnace slag (GGBS), silica fume and 0.5% Alkali Resistant (AR) glass fibers are added to the total volume of concrete. Mix design for M40 grade concrete was developed for different proportions 15%, 30%, 45% of cement and strength and durability properties are determined. Strength properties like compressive split tensile, bending for all the proportions is tested and optimum proportion was chosen for beam casting. From the results, it was concluded that 30% replacement of cement is optimum for concrete strength properties. Hence, two beams are casted with different cross sections 150 × 150 mm × 1500 mm, 230 × 230 mm × 1500 mm for 30% replacement of cement with Glass Fiber Concrete (GFC) and two beams are casted with concrete of M40 grade. Beams are tested under two point loading comparing flexural strength, load deflection curves and different types of failures in Glass Fiber Reinforced Beam (GFRB) with conventional beam. Durability test is also done by curing cubes in chemicals like with concentrations of 3.5% NaCl, 5% H2SO4, 3% MgSO4 solutions for 56 days and results are compared between blended and conventional concrete.

To the question of strength and stability increasing of thin retaining walls

The features of structural and technological solutions of strength and stability increasing of thin retaining walls and reinforcement of the backfill soil, dam, and slope are considered. Glassfiber concrete was proposed as the material for the wall which, as compared with ordinary concrete, has enhanced performance characteristics. Despite the variety of solutions for soil reinforcement and ways to minimize horizontal deformations, a new technological solution has been developed to increase the stability of the walls while increasing the additional load on the soil within the pressure prism. It is given the description of this solution and the results of experimental studies in confirmation of the theoretical assumptions about the improvement of the physical and mechanical characteristics of the backfill soil during the construction of retaining walls.