Flexural reinforcement of concrete with textile reinforced mortar TRM (original) (raw)
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Textile Reinforced Mortar Based Flexural Strengthening of Reinforced Concrete Beams
Proceedings of International Structural Engineering and Construction, 2020
Strengthening of reinforced concrete (RC) structures is often necessary due to the change of using or to enhance the strength of deteriorated existing RC structures attributed to aging and environmental effects. Interfacial bond between the existing RC member and the strengthening layer is known to be the main factor for any successful strengthening technique. This study investigates the efficiency of utilizing high strength cementitious connectors in preventing the debonding of textile reinforced mortar (TRM) strengthening layer from substrate concrete of RC beams. An experimental program is developed to investigate the effect of strength of mortars and the distribution of cementitious connectors on the behavior of the strengthened beams. TRM comprising eight and sixteen textile basalt fiber layers were utilized in these experiments. The results demonstrate the effectiveness of cementitious connectors on the failure mode of strengthened beams by means of controlling the debonding o...
Flexural Behavior of Textile-Reinforced Concrete
MATEC Web of Conferences, 2016
This paper deals with the flexural behaviour of textile-reinforced concrete (TRC). Two samples of TRC made of high strength reinforcing fabrics made of glass and carbon rovings were produced. Three-point bending test was carried out to examine the flexural performance of the developed samples. The maximum flexural strength and reinforcement efficiency were calculated. Experimental results showed that that all types of applied fabric reinforcement contributed to increases strength as compared to nonreinforced concrete. Furthermore, the deformation behavior of reinforced concrete was analyzed. The advantage is in higher residual load-bearing capacity, which allows maintaining the integrity of the structure.
SP-230: 7th International Symposium on Fiber-Reinforced (FRP) Polymer Reinforcement for Concrete Structures, 2005
(FRP) are investigated in this study in comparison with a new class of materials, textile reinforced mortars (TRM), for shear strengthening and/or seismic retrofitting of concrete structures. Textiles comprise fabric meshes made of long woven, knitted or even unwoven fiber rovings in at least two (typically orthogonal) directions. Mortars-serving as binders-contain polymeric additives in order to have improved strength properties. In this study, experimental investigations were carried out in order to provide a better understanding on the effectiveness of TRM versus FRP jackets as a means of increasing: (i) the axial capacity of concrete through confinement; and (ii) the load-carrying capacity of shear-critical reinforced concrete flexural members. From the results obtained it is strongly believed that the proposed TRM strengthening technique is a viable alternative to the already successful FRP strengthening technique.
Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review
Journal of Composites for Construction, 2019
Textile reinforced mortars (TRM), also known in the international literature as textile reinforced concrete (TRC) or fabric reinforced cementitious matrix (FRCM) materials, have been widely studied during the last two decades as they constitute a promising alternative to the fiber reinforced polymer (FRP) retrofitting solution for strengthening of reinforced concrete members. This paper presents a state-of-the-art review on the strengthening of concrete structures with TRM. First, the tensile and bond behavior of TRM is described. Next, an overview of studies on the use of TRM for flexural, shear, confinement, and seismic retrofitting of concrete or RC members is included, and the key parameters are investigated.
Textile Reinforced Concrete: Design Methodology and Novel Reinforcement
2015
Fibre reinforcement has been used to reinforce concrete members for decades. It has combined well with concrete to help control cracking and increase toughness and other properties such as corrosion resistance. The use of traditional fibre reinforcement has led to the development of a new material called textile reinforcement (multifilament continuous fibre) which can also be used as the main reinforcement instead of steel reinforcement. This study experimentally investigates concrete beams reinforced only with carbon textile material (TRC beams). The tensile strength of textile reinforcement and pull out strength of TRC were measured. Four-point bending tests were performed on 76 beams (small and large scale beams). Several parameters such as volume fraction and reinforcement layout were studied in order to investigate their effect on TRC beam behaviour. The results showed that with the correct layout and geometry of textile reinforcement, these reinforced concrete beams, providing...
An Overview of Strengthening Concrete Members with Textile Reinforced Mortar
Smart Green M aterials, 2024
Textile-reinforced mortar (TRM) or fabric-reinforced concrete has a wide range of applications, including repair work, structural strengthening, ditch lining, erosion control, pipe protection, trackways, flood defenses, roofing, and emergency helicopter landing pads. This paper focuses specifically on structural strengthening, particularly shear strengthening and jacketing. According to the findings, among the materials considered, benzobisoxazole (PBO) proves to be the most effective, enhancing the shear capacity of the members by 43.3%, followed by carbon, basalt, and glass fibers. When using fixed materials for strengthening, a U-shaped configuration is more effective than an S-shaped one, increasing shear capacity by 131% compared to 71% for the S-shape. The results also show that increasing the number of textile layers during the strengthening process boosts the shear capacity of the element. Applying the textile layers directly in a straight pattern provides higher capacity than a spiral application. Furthermore, using epoxy resin as a mortar for TRM results in a greater load capacity for column strengthening. A column strengthened with two layers of textiles had more capacity than one with just a single layer. Additionally, when the mortar contains a cementitious material modified with polymer, the flexural capacity is 5.3% higher than that of textiles using cement alone as the mortar.
Flexural Behavior of a Novel Textile-Reinforced Polymer Concrete
Polymers
Textile reinforced concrete (TRC) has gained attention from the construction industry due to its light weight, high tensile strength, design flexibility, corrosion resistance, and remarkably long service life. Some structural applications that utilize TRC components include precast panels, structural repair, waterproofing elements, and façades. TRC is produced by incorporating textile fabrics into thin cementitious concrete panels. Premature debonding between the textile fabric and concrete due to improper cementitious matrix impregnation of the fibers was identified as a failure-governing mechanism. To overcome this performance limitation, in this study, a novel type of TRC is proposed by replacing the cement binder with a polymer resin to produce textile reinforced polymer concrete (TRPC). The new TRPC is created using a fine-graded aggregate, methyl methacrylate polymer resin, and basalt fiber textile fabric. Four different specimen configurations were manufactured by embedding 0...
2017
Performance degradation of existing RC structures due to aging and environmental effects made strengthening of RC structures a global issue. Bond between the substrate member and new strengthening layer is considered a threshold for any successful strengthening technique. This study explores the efficiency of using cementitious high strength connectors in preventing the debonding of TRM strengthening layer from strengthened RC beams. The experimental program includes two parts. In first part, the effect of strength, ratio, diameter and distribution of connectors, for smooth and rough surfaces, on the tensile bond strength are examined. The applicability of these connectors is investigated in second part by means of RC beams strengthened with TRM comprising four and eight textile basalt fibre layers. The results demonstrate that the inclusion of cementitious connectors changed the failure mode from debonding failure to desired flexural failure. The proposed improvement exhibited incr...
Textile-Reinforced Concrete as a Structural Member: A Review
Buildings
Textile-reinforced concrete (TRC) is a form of reinforced concrete, where conventional reinforcement is replaced with textiles or fibers. The high tenacity of the textile fibers results in flexible and durable concrete structures. The literature has been limited to TRC applications in retrofitting and nonstructural applications. Therefore, this article attempts to detangle the progressive research direction on the usage of TRC as a structural member. For this, (i) a bibliometric study using scientometrics analysis to visualize the keyword network, and (ii) qualitative discussions on identified research areas were performed. The literature was categorized into four main research areas, namely material properties of TRC, composite behavior of TRC, bond-slip relations, and TRC applications as structural elements. In addition, the advantages and disadvantages in the usage of TRC as a structural member are discussed in association with the identified research areas. Furthermore, the arti...
Flexural Performance of Small-Scale Textile-Reinforced Concrete Beams
Crystals
Textile-reinforced concrete (TRC) as a novel high-performance composite material can be used as a strengthening material and component bearing load alone. The flexural performance of TRC beams strengthened with textile reinforcement such as carbon tows was experimentally examined and associated with those of steel-reinforced concrete (SRC) beams. Through four-point bending tests, this research explores the effects of textile layers and dosages of short textile fibre on the flexural strength of concrete beams. A total of 64 prism samples of size 100 mm × 100 mm × 500 mm were made, flexure-strengthened, and tested to evaluate various characteristics and the efficiency of TRC versus SRC beams. TRC beams performed exceptionally well as supporting material in enhancing concrete’s flexural capacity; in addition, TRC’s average ultimate load effectiveness was up to 56% than that of SRC specimens. Furthermore, the maximum deflection was about 37% lesser than SRC beams. The results showed tha...