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

2020 ◽  
Vol 1 (103) ◽  
pp. 5-15
Author(s):  
S. Hussain ◽  
J.S. Yadav
Keyword(s):  
Glass Fiber ◽  
Elevated Temperatures ◽  
Glass Fibers ◽  
Fiber Reinforced Concrete ◽  
Split Tensile Strength ◽  
Conventional Concrete ◽  
Glass Fiber Reinforced ◽  
Fibre Concrete ◽  
Percentage Weight ◽  
Temperature Exposure

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.

scholarly journals Force-Deformation Study on Glass Fiber Reinforced Concrete Slab Incorporating Waste Paper

2022 ◽  
Vol 2022 ◽  
pp. 1-10
Author(s):  
S. Praburanganathan ◽  
N. Sudharsan ◽  
Yeddula Bharath Simha Reddy ◽  
Chukka Naga Dheeraj Kumar Reddy ◽  
L. Natrayan ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Glass Fiber ◽  
Concrete Slab ◽  
Glass Fibers ◽  
Fiber Reinforced Concrete ◽  
Waste Paper ◽  
Fiber Reinforced ◽  
Reinforced Concrete Slab ◽  
Conventional Concrete ◽  
Glass Fiber Reinforced

This study inspects the viability of engaging the discarded paper wastes in concrete by varying the volume proportions from 0%–20% with each 5% increment in replacement of the weight of cement. A physiomechanical study was conducted, and the results were presented. A glass fiber reinforced rectangular slab with a longer span (ly) to shorter span (lx) ratio of (ly: lx) 1.16 was cast with optimum replacement of waste-paper mass and compared the force-deformation characteristics with the conventional concrete slab without waste paper. The optimum percentage of discarded papers for the replacement of cement is 5%. Also, the results imply that the compressive strength at the age of 28 days is 30% improved for the optimum replacement. Based on the outcomes of the investigation, it can be inferred that the compressive strength gets progressively reduced if the volume of the discarded paper gets increases. The incorporation of glass fibers improves the split and flexural strength of the concrete specimens considerably. The ultimate load-carrying capacity of the glass fiber reinforced waste paper incorporated concrete slab measured 42% lower than that of the conventional slab. However, development of the new type of concrete incorporating waste papers is the new trend in ensuring the sustainability of construction materials.

scholarly journals Durability and Physical Properties of Glass Fiber Reinforced Concrete Subjected to Elevated Temperatures

2019 ◽  
Vol 8 (11) ◽  
pp. 3845-3848
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Reinforced Concrete ◽  
Glass Fiber ◽  
Elevated Temperatures ◽  
Glass Fibers ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
The Matrix

Addition of glass fibers into concrete significantly modifies its tensile strength. The fibers are placed at desired locations and orientations by the matrix surrounding it, thereby making the fibers as principal load carrying members and also protecting them from environmental damage. Glass fibers provide resistance to high temperature, and the ease of incorporating them into the matrix either in continuous or discontinuous lengths. In this work, carbonation test representing the durability of Glass Fiber Reinforced Concrete (GFRC) was carried out, and then experimental program determines the properties like compressive strength, split tensile strength and flexural strength of GFRC for 7 days and 28 days of curing, with percentage of fibers in ratios 0.5%, 1%, 1.5%, 2% and performance of GFRC at elevated temperatures of 300°c, 500°c, 700°c, 1000°c are compared with conventional concrete. The results depict that, the residual compressive strength capacity of GFRC is greater than unreinforced concrete both at elevated and normal temperatures.

scholarly journals Effect of Glass Fibers on The Mechanical Behavior As Well As Energy Absorption Capacity and Toughness Indices of Concrete Bridge Decks.

2021 ◽  
Author(s):  
Ahmad Jan ◽  
Zhang Pu ◽  
Kashif Ali Khan ◽  
Izhar Ahmad ◽  
Irshad Khan
Keyword(s):  
Energy Absorption ◽  
Glass Fibers ◽  
Bridge Decks ◽  
Absorption Capacity ◽  
Fiber Reinforced Concrete ◽  
Concrete Bridge ◽  
Energy Absorption Capacity ◽  
Conventional Concrete ◽  
Concrete Bridge Decks ◽  
Glass Fiber Reinforced

Abstract In this study, the incorporation of glass fibers in concrete bridge decks has been studied for improving its mechanical properties as well as energy absorption capacity and toughness indices. The mix proportion of 1:3:2 (cement:sand:aggregate) was selected having water-cement ratio of 0.71. For the manufacturing of glass fiber reinforced concrete (GFRC), the glass fibers (2-inch) were incorporated at a percentage level of 1%, 2%, 3% and 4% by weight of cement in concrete mixes. The findings reveal that the split-tensile and flexural strength of GFRC increases at all the percentage levels, however, the compressive strength of the blended mixes get reduced by increasing the dosage of glass fibers in the concrete. Besides, the energy absorption and toughness indices are also studied for different types of loadings (i.e. compressive, splitting-tensile and flexural loadings) up to a percentage level of 4%. The findings reveal that the split-tensile and flexural energy absorption was increased with the increase in the dosage of glass fibers in comparison with the conventional concrete mixes, however, the compressive energy absorption of the blended mixes get reduced by increasing the dosage of glass fibers in the concrete. Whereas, the toughness indices for compressive, spilt-tensile and flexure was increased while increasing the percentage of glass fibers as compared to the conventional concrete. Among the different percentages of glass fibers, its 4% addition gives better results as compared to 1%, 2% and 3%. Hence, the 4% of GF can be suggested to be the optimum percentage of the fibers for the selected mix-design in controlling the resistance of concrete in the bridge decks. Although, the energy absorption of GFRC is lesser in comparison with the toughness indices, GFRC are appropriate for enhancing ductility and resistance against loadings in concrete bridge decks.

scholarly journals AGEING MODELS AND ACCELERATED AGEING TESTS OF GLASS FIBER REINFORCED CONCRETE

2018 ◽  
Vol 10 (1) ◽  
pp. 10-17
Author(s):  
Rimvydas MOCEIKIS ◽  
Asta KIČAITĖ ◽  
Gintautas SKRIPKIŪNAS ◽  
Aleksandrs KORJAKINS
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Glass Fiber ◽  
Glass Fibers ◽  
Fiber Reinforced Concrete ◽  
Accelerated Ageing ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Corrosion Mechanisms ◽  
Concrete Matrix

Glass fiber reinforced concrete (GRC) is used for 40 years to create world’s most stunning and complex architectural elements due to its high mechanical properties, particularly flexural strength. Yet it is very important to note that any type of glass fibers in the concrete matrix are undergoing complex ageing processes, resulting to significant decrease of initial mechanical characteristics of this composite material under natural weathering conditions. Aspects of GRC durability are mainly dependent from the properties of fibers and interaction between them and concrete matrix. In this article, long term strength retention of this composite material is discussed, existing experimental data of weathering tests presented, and main corrosion mechanisms explained. Lack of knowledge about freeze- thaw resistance of glass fiber reinforced concrete is addressed. Finally, latest attempts of GRC durability improvement are reviewed, such as adding micro fillers, polymers to the concrete matrix and enhancing surface of fibers in Nano scale.

scholarly journals Experimental Study on the Performance of Graded Glass Fiber Reinforced Concrete (G-GRC) Based on Engineering Application

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1149
Author(s):  
Qingbiao Wang ◽  
Hongxu Song ◽  
Yue Li ◽  
Fuqiang Wang ◽  
Zhongjing Hu ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Glass Fiber ◽  
High Performance ◽  
Glass Fibers ◽  
Engineering Application ◽  
Fiber Reinforced Concrete ◽  
High Dispersion ◽  
Fiber Reinforced ◽  
Partition Wall ◽  
Glass Fiber Reinforced

An important way to improve concrete performance is the use of alkali-resistant glass fibers (ARGFs) as reinforcement. This paper is based on the problems of the cracking of the partition wall and lining seepage in Laoshan Tunnel, Qingdao, China. Two types of ARGFs were selected as reinforcement materials for the partition wall and lining concrete: high dispersion (HD) and high performance (HP); and the compressive strength (CS), tensile strength (TS), flexural strength (FS), and impervious performance (IP) of concrete with different gradations of the two types of fibers were investigated. The results show that although the CS of graded glass fiber reinforced concrete (G-GRC) is slightly decreased, the TS, FS, and IP of G-GRC are significantly improved. When the densities of the ARGFs of HD and HP are 0.6 and 5 kg/m3, respectively, G-GRC performs best; additionally, compared with ordinary concrete, the TS, FS, and IP of G-GRC are increased by 15.86%, 14.90%, and 31.58%, respectively. Meanwhile, the tension–compression ratio is increased by 22.29%, and the mechanical properties of concrete are remarkably enhanced. The research results were successfully applied to the construction of the Laoshan tunnel, and good engineering results were obtained.

scholarly journals Glass fiber reinforced concrete (GFRC) - strength and stress strain behavior for different grades of concrete

2018 ◽  
Vol 7 (4.5) ◽  
pp. 707
Author(s):  
Kiran Kumar Poloju ◽  
Chiranjeeevi Rahul ◽  
Vineetha Anil
Keyword(s):  
Reinforced Concrete ◽  
Glass Fiber ◽  
Plain Concrete ◽  
Fiber Reinforced Concrete ◽  
Experimental Program ◽  
Small Scale ◽  
Fiber Reinforced ◽  
Conventional Concrete ◽  
Quality Properties ◽  
Glass Fiber Reinforced

Concrete is a frail building material in strain. Characteristically, because of variety in temperature small cracks will be available in concrete. In addition, solid experiences low rigidity, constrained flexibility and little protection from splitting. Plain concrete will create splits because of plastic shrinkage, drying shrinkage and different reasons also .The advancement of these small scale breaks causes flexible miss happen-ing in concrete. The solid with no fiber is considered as fragile and feeble material. Related to glass fiber use there lies numerous techno efficient inquiries that settles on the decision of GFRC over strengthened cement troublesome. This paper exhibits the change in the mechan-ical quality properties and flexibility properties of Glass Fiber Reinforced Concrete. An Experimental program was done with and without utilizing glass fiber in various rate 0 to 0.09 percentages in conventional concrete keeping in mind the end goal to enhance the mechanical properties, stretch strain conduct and arrangement of splits. In light of the outcomes acquired from the trial comes about the conclusion is that both fiber and cementitious lattice can hold their physical and substance properties and they deliver a blend of properties that can't be accomplished when these segments are acting alone.  

scholarly journals Strength Characteristics of Glass Fiber Reinforced Concrete (GFRC) using Calcium Chloride Integral Curing Method

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3040-3044
Keyword(s):  
Compressive Strength ◽  
Glass Fiber ◽  
Calcium Chloride ◽  
Glass Fibers ◽  
Concrete Surface ◽  
Fiber Reinforced Concrete ◽  
Cold Weather ◽  
Test Results ◽  
Glass Fiber Reinforced ◽  
Curing Method

Concrete is weak in tension and strong in compression. The inclusions of fibers in concrete significantly improves its compressive as well as tensile strength. The use of different types of fibers have shown positive responses among the researchers. It has long been known that curing concrete during cold weather can result in an inferior product with substandard properties. Curing also takes much longer, adding to job costs and extending the time before the concrete surface can be used. There are many accelerators available in the market, but Calcium Chloride continues to be one of the most preferred one. In this study, Alkali resistant glass fibers (0%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5% and 4%) were used in the concrete M30 mix. The optimum glass fiber percentage that can be added to the concrete is found by comparing both tensile and compressive strength of the GFRC. Trial mixes of normal M30 concrete by adding different percentages of Calcium Chloride (0%, 0.5%, 1%, 1.5%, 2%, and 2.5%) as curing agent is also prepared. The optimum percentage of calcium chloride that can be added to the concrete is found by comparing the compressive strength of the con- crete. The compressive strength of the GFRC using calcium chloride integral cur- ing is found after 7, 14 and 28 days. The test results are then compared with GFRC using normal curing.

scholarly journals Mechanical and thermal behaviors comparison of basalt and glass fibers reinforced concrete with two different fiber length distributions

2017 ◽  
Vol 3 (4) ◽  
pp. 155
Author(s):  
Sadık Alper Yıldızel
Keyword(s):  
Heat Transfer ◽  
Reinforced Concrete ◽  
Glass Fiber ◽  
Fiber Length ◽  
Glass Fibers ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced

This paper deals with the mechanical and thermal behavior of glass and basalt fiber reinforced concrete. Two different composites were studied containing either basalt or glass fibers. Fiber ratios were selected as 1%, 1.25% and 1.5% for glass fiber; 0.3%, 0.4% and 0.5% for basalt fibers. Fiber length was preferred as 12 mm and 24 mm. The addition of basalt fiber had very limited effect on the compressive, flexure and thermal conductivity properties compared to the glass fiber reinforced composite. The results also showed that composites having fibers with the length of 12 mm had better mechanical properties. Heat transfer simulation of the composites were also conducted. It was obtained that both fibers with the length of 12 mm had very close results on the heat transfer studies.

scholarly journals A Fatigue Damage Model for Life Prediction of Injection-Molded Short Glass Fiber-Reinforced Thermoplastic Composites

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2250
Author(s):  
Mohammad Amjadi ◽  
Ali Fatemi
Keyword(s):  
Injection Molding ◽  
Glass Fiber ◽  
Fatigue Damage ◽  
Life Prediction ◽  
Glass Fibers ◽  
Damage Model ◽  
Fiber Reinforced ◽  
Short Glass Fiber ◽  
Glass Fiber Reinforced ◽  
Short Glass

Short glass fiber-reinforced (SGFR) thermoplastics are used in many industries manufactured by injection molding which is the most common technique for polymeric parts production. Glass fibers are commonly used as the reinforced material with thermoplastics and injection molding. In this paper, a critical plane-based fatigue damage model is proposed for tension–tension or tension–compression fatigue life prediction of SGFR thermoplastics considering fiber orientation and mean stress effects. Temperature and frequency effects were also included by applying the proposed damage model into a general fatigue model. Model predictions are presented and discussed by comparing with the experimental data from the literature.

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