scholarly journals Bonding capacity of the GFRP-S on strengthened RC beams after sea water immersion

2017 ◽  
Author(s):  
Mufti Amir Sultan ◽  
Rudy Djamaluddin
Keyword(s):  
Sea Water ◽  
Water Immersion ◽  
Rc Beams

Water absorption effect on the in-plane shear properties of jute–glass–carbon-reinforced composites using Iosipescu test

2018 ◽  
Vol 53 (21) ◽  
pp. 3033-3045 ◽  
Author(s):  
MA Abd El-baky ◽  
MA Attia
Keyword(s):  
Water Absorption ◽  
Water Uptake ◽  
Sea Water ◽  
Water Immersion ◽  
Cost Effective ◽  
Stacking Sequence ◽  
Plane Shear ◽  
Noticeable Effect ◽  
Shear Properties ◽  
Glass Carbon

The main objective of the present paper is to study the water absorption of jute–glass–carbon-reinforced epoxy composites and its subsequent effect on the in-plane shear performance of these composites. The effects of the reinforcement hybridization, stacking sequence and relative fabric amounts on the shear behavior of dry and wet conditioned composite specimens are reported and discussed. Composites have been fabricated in inter-ply configuration using the hand lay-up process. The prepared specimens have been subjected to distilled water and sea water immersion at room temperature for 60 days. Results indicated that water uptake of jute-reinforced composite and its hybrids with glass and/or carbon follows Fickian-like behavior. Water uptake induces a significant decrease in the in-plane shear strength. Hybridizing jute fabric with glass and/or carbon fabrics improves the in-plane shear properties of both dry and wet specimens. The stacking sequence and relative fabric amounts have a noticeable effect on the studied shear properties. Also, the hybrid composite with jute as facings and glass as core, JGJ, offers the most balanced set of properties on a cost-effective basis compared to the other studied hybrids.

scholarly journals Tall Wheatgrass (Thinopyrum ponticum): Flood Resilience, Growth Response to Sea Water Immersion, and Its Capacity for Erosion and Flooding Control of Coastal Areas

Environments ◽  
2019 ◽  
Vol 6 (9) ◽  
pp. 103
Author(s):  
Stoyan Vergiev
Keyword(s):  
Growth Response ◽  
Sea Water ◽  
Oxygen Deficiency ◽  
Water Immersion ◽  
Coastal Zone Management ◽  
Mitigation Strategies ◽  
Natural Ecosystems ◽  
Thinopyrum Ponticum ◽  
Zone Management ◽  
Tall Wheatgrass

Integrated coastal zone management proposes nature-based mitigation strategies based on the replacement of artificial coastal stabilization and protection structures with dunes stabilized with plant species. These psammophytes stabilize sands and act as supporters, increasing dunes’ ability to reduce storm damages and effectively minimize erosion with minimal negative impacts to natural ecosystems. That is why searching for native salt-tolerant plants with extensive root systems and studying their capacity for erosion and flooding control is fundamental to the practice of ecologically-sound ecosystem services. The aim of the present study is to define the effects of flooding stress on a number of wheatgrass (Thinopyrum ponticum) plant life aspects (survival ability, viability, and growth response) in order to determine wheatgrass’s capacity as dune stabilizer. Conducted experiments established that T. ponticum was very tolerant to immersion impact and salt and oxygen deficiency stress, and its rhizomes were able to regenerate after 30 days in seawater. The temporal expression of its survival is presented as critical decomposition time (CDT) by linking the maximum duration of floods along the Bulgarian Black Sea Coast and the resilience of tall wheatgrass in flooding simulations. A statistical analysis of the experimental data demonstrated that immersion in sea water increases rhizome viability, biomass, and allocation to root biomass, whereas other factors, such as the duration of immersion, salinity, and temperatures of sea water have no significant effect. According to flood resilience and growth response to sea water submergence, T. ponticum demonstrated high potential to be a dune stabilizer.

scholarly journals Studi Kapasitas Lendutan, Daktalitas, dan Kekakuan pada Balok Beton Bertulang yang Diperkuat GFRP-S dengan Perendaman Air Laut Selama Satu Tahun

2019 ◽  
Vol 5 (2) ◽  
pp. 112
Author(s):  
Asri Mulya Setiawan ◽  
Erniati Bachtiar
Keyword(s):  
Test Object ◽  
Concrete Beam ◽  
Sea Water ◽  
Water Immersion ◽  
Reinforced Concrete Beam ◽  
Test Method ◽  
The Other ◽  
Test Results ◽  
Loading Method ◽  
Simple Supports

This study aims to analyze the deflection capacity, ductality and stiffness of reinforced concrete beam structures reinforced by GFRP with sea water immersion for 1 year. The test method used is a monotonic loading method that uses two simple supports over the test object and is pressed at a constant ramp actuator speed of 0.05 mm / sec until the concrete beam fails. The test results show that BF0 is more ductile compared to BF6 and BF12. This can be seen the existing deflection, where BF0 has a deflection that tends to be larger than the other beams. In BF0 specimens, the load that is able to hold is greater than BN specimens, but the resulting deflection is also greater

scholarly journals GFRP-sheet strengthened RC beams after seawater immersion under monotonic and fatigue loads

2019 ◽  
Vol 276 ◽  
pp. 01029 ◽  
Author(s):  
Arbain Tata ◽  
Anthonius Frederik Raffel ◽  
Muhammad Ihsan ◽  
Rudy Djamaluddin
Keyword(s):  
Concrete Beams ◽  
Sea Water ◽  
Water Immersion ◽  
Reinforced Concrete Beams ◽  
Glass Fibre Reinforced Polymer ◽  
Glass Fibre Reinforced ◽  
Fatigue Loads ◽  
Monotonic Loads ◽  
Flexural Beam ◽  
Gfrp Reinforcement

This study aims to analyse glass fibre reinforced polymer (GFRP) reinforcement on reinforced concrete beams under fatigue and monotonic loads influenced by sea water. The research was conducted in the laboratory on flexural concrete beams with the quality of f´c= 25 MPa. One normal concrete flexural beam (BN) with repetitive load was without seawater and no reinforcement. One flexural beam was without sea water immersion but with GFRP-reinforcement. Another flexural beam reinforced by GFRP sheets is immersed in a pond containing seawater with time variations up to 12 months. The test was performed with a fatigue load of 1.25 Hz frequency to failure. The results showed an increase in capacity due to 58.3% for GFRP-reinforcement. There is a decrease in the capacity of GFRP sheet influenced by seawater immersion. The same trend with the decrease in ductility occurred in the flexural beam to 14% due to seawater immersion. Maximum beam failure repetition occurred at 1,230,000 cycles on beam with reinforcement (BF). The failure occurring in the flexural beam was preceded by the failure of the attachment between the concrete and the GFRP sheet at the load centre (mid of span) slowly to the support until failure (debonding) initialized. The GFRP-S bonding capacity to the concrete skin has decreased in 12 months by 15%. Therefore, there is a significant effect of decreasing strength due to fatigue loads and seawater immersion.

Sea Water Effects on Surface Morphology and Interfacial Bonding of Sugar Palm Fiber to Sago Matrix

2016 ◽  
Vol 724 ◽  
pp. 39-42 ◽  
Author(s):  
H. Mardin ◽  
I.N.G. Wardana ◽  
Kamil Kusno ◽  
Pratikto ◽  
S. Wahyono
Keyword(s):  
Surface Morphology ◽  
Room Temperature ◽  
Sea Water ◽  
Water Immersion ◽  
Fiber Morphology ◽  
Palm Fiber ◽  
Maximum Duration ◽  
Sugar Palm Fiber ◽  
The Matrix ◽  
Water Effects

Effects of sea water immersion for palm fiber in relation to surface morphology, roughness and bonding between the fiber and sago matrix were observed. Duration of immersion varied in 1, 2, 3 and 4 weeks, and then dried at room temperature for 3 hours continued by oven at 80 °C for 6 hours. SEM and roughness arithmetic tests were applied to see surface morphology, roughness and bonding between fiber and the matrix. Result shows fiber morphology and roughness varies by the duration of immersion. The surface roughness increases as immersion continues along with fiber - matrix bonding improvement. The maximum duration of 4 weeks fiber immersion resulted in the best interlocking of matrix and fibers, as the slits between them disappear.

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