Fiber-reinforced concrete is considered to be a material of improved properties and not as reinforced cement concrete whereas reinforcement is provided for the local strengthening of concrete in tension region. Fibers generally used in cement concrete pavements are steel fibers and organic polymer fibers such as polyester or polypropylene. The seminar report and PPT on Fiber Reinforced Concrete explain the amount of fibers added to a concrete mix is expressed as a percentage of the total volume of the composite concrete and fibers , termed "volume fraction" Vf.
Vf typically ranges from 0. View 2 excerpts, cites background and results. Evaluation of maxillary anterior endodontically treated teeth restored with different types of crowns. Highly Influenced. View 5 excerpts, cites results and background. Medicine, Materials Science. The journal of contemporary dental practice. Protection of the remaining tooth structure for long term success after root canal treatment, preserving the ferrule effect around the root and adhesion of root canal post are considered as the most … Expand.
The reinforcement effect of polyethylene fibre and composite impregnated glass fibre on fracture resistance of endodontically treated teeth: An in vitro study. Journal of conservative dentistry : JCD. Clinical, cosmetic and investigational dentistry. View 1 excerpt, cites background. Comparative evaluation of fracture resistance of glass fiber reinforced, carbon, and quartz post in endodontically treated teeth: An in-vitro study.
Materials Science, Medicine. Aim and Objectives: Use of posts improves the physical properties of endodontically-treated teeth. Different post types are developed such as metal, custom-made, carbon, and quartz. A 4-year-old male patient reported to the Department of Pedodontics and Preventive Dentistry with a chief complaint of decayed upper front teeth.
Intraoral examination revealed a complete set of deciduous dentition. It was observed that 55, 52, 51, 61, 62, 65, 71, 72, 73, 74, 75, 81, 82, 83, 84, and 85 were affected by dental caries Figure 1. Intraoral periapical radiographs revealed pulp involvement with 52, 51, 61, and 62 Figure 2. Diet analysis, counseling, and oral prophylaxis were done. Step 1. Endodontic phase. Step 2. Construction of the restoration. An infraorbital block was administered for 61 and 62, and labial and palatal infiltration was carried out for 51 and Gross carious lesions were removed with a no.
Unsupported enamel was not removed so as to preserve as possible. The pulp chamber was opened and working length determination IOPA was taken with a no. The pulp tissue was extirpated using no. After irrigation with copious amounts of 2.
A thick mix of Endofloss paste was then condensed with lentulo spiral into the canal. The obturated material was allowed to set for 10 minutes Figure 4. The post space was prepared 1 week after the endodontic treatment was completed. All visible Endofloss cement on the walls of the post space was removed. This space was rinsed and air dried with oil-free compressed air.
A light-cured bonding agent was brushed on the etched surface and uniformly dispersed by a compressed air blast. It was then light cured with for 20 seconds. The GFRC post was then cured for 20 seconds in order to gain rigidity, before insertion into the post space. Light cured flowable composite resin was then inserted into the canal chamber after which the GFRC post was inserted Figure 5.
The fiber post and composite were then cured with together for 60 seconds. The coronal portion of the glass fibre-reinforced composite post was splayed to increase the surface area for the retention of the core.
The coronal enamel was then etched for 20 seconds, rinsed with water and air dried followed by application of bonding agent—which was then light cured. The coronal post was then covered with the flowable composite for core build up, followed by light curing it for 60 seconds, and finally teeth were restored with hybrid composite.
The final finishing and polishing was done with finishing burs. Occlusal interferences in normal and paranormal mandibular movements were removed Figure 6. Esthetic restoration of primary teeth has long been a special challenge to pediatric dentists. When there is severe loss of coronal tooth structure, the use of posts placed inside the canal after endodontic treatment will give retention, provide stability to the reconstructed crown, and withstand masticatory forces in function.
The mixing is done till to get uniform mix of concrete is obtained. After the casting of column specimen, it was get cured for 28 days in the curing tank. After 28 days of curing, the Pt slab is post tensioned while anchorages and wedge plates are provided at end of the slab. Then tendons are inserted into duct and tightened with the help of anchors.
Hydraulic jack is fixed to the tendons , after that jack is checked for the stability, After fixing the tendons are stressed by applying load to it. The breaking load of tendons is 6KN, so a safe load of 2KN is given to the tendons. By stressing the tendons it is elongated upto 30mm in length. The elongated area is marked with the marker and left for 24hrs to avoid slippage of the tendon. After 24hrs the elongated tendons has been cut down and leaving small length of wire around 20mm. ANSYS Workbench is a software environment for performing structural, thermal, and electromagnetic analyses.
Literature review has been done properly and most the data about Post tensioning of the column and the uses of high performance fiber reinforced concrete in the Post-Tension tchnique has been collected using the literature. PT slab size and properties of steel fibers and HPFRC have been fixed and the calculation of the maximum load has also been done. Using those results analytical design has been done in ANSYS Software, and the results have been obtained in the terms of deflection and maximum stresses.
A series of reinforced concrete PT slab specimens for seismic. The increasing amount of steel fibers in PT slabs results in the increase of both, the punching shear resistance and the energy absorption capacity in comparison to slabs without fibers. The effect of steel fibers on punching shear resistance of higher-strength concrete slabs has shown to be lower than that of lower-strength concrete slabs.
Furthermore, the contribution of the steel fibre was captured by the finite element model due to the implemented tensile behaviour of the SFRC, containing the residual tensile strength. The parameter study of the tensile properties of SFRC showed that the finite element model was relatively sensitive to the tensile model, especially when the strain energy of the system was increased results.
In addition to efficiency and reduced cost during construction, the structure has sufficient ductility in ultimate limit state. Duarte M. Faira et al -Strengthening of flat Slabs with Post-tensioning using anchorages by bonding.
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