scholarly journals Structural Performance of Polymer Fiber Reinforced Engineered Cementitious Composites Subjected to Static and Fatigue Flexural Loading

2021 ◽  
Author(s):  
Mohamed A. A. Sherir ◽  
Khandaker M. A. Hossain ◽  
Mohamed Lachemi
Keyword(s):  
Fly Ash ◽  
Strain Hardening ◽  
Fatigue Loading ◽  
Fiber Reinforced Concrete ◽  
Silica Sand ◽  
Cementitious Composites ◽  
Polymer Fiber ◽  
Fiber Reinforced ◽  
Engineered Cementitious Composites ◽  
Cracking Behavior

This paper presents the influence of silica sand, local crushed sand and different supplementary cementing materials (SCMs) to Portland cement (C) ratio (SCM/C) on the flexural fatigue performance of engineered cementitious composites (ECCs). ECC is a micromechanically-based designed high-performance polymer fiber reinforced concrete with high ductility which exhibits strain-hardening and micro-cracking behavior in tension and flexure. The relative high cost remains an obstacle for wider commercial use of ECC. The replacement of cement by SCMs, and the use of local sand aggregates can lower cost and enhance greenness of the ECC. The main variables of this study were: type and size of aggregates (local crushed or standard silica sand), type of SCMs (fly ash “FA” or slag), SCM/cement ratio of 1.2 or 2.2, three fatigue stress levels and number of fatigue cycles up to 1 million. The study showed that ECC mixtures produced with crushed sand (with high volume of fly ash and slag) exhibited strain hardening behavior (under static loading) with deformation capacities comparable with those made with silica sand. Class F-fly ash combined with crushed sand was the best choice (compared to class CI fly ash and slag) in order to enhance the ECC ductility with slag–ECC mixtures producing lowest deflection capacity. FA–ECC mixtures with silica sand developed more damage under fatigue loading due to higher deflection evolution than FA–ECC mixtures with crushed sand.

scholarly journals Structural Performance of Polymer Fiber Reinforced Engineered Cementitious Composites Subjected to Static and Fatigue Flexural Loading

2021 ◽  
Author(s):  
Mohamed A. A. Sherir ◽  
Khandaker M. A. Hossain ◽  
Mohamed Lachemi
Keyword(s):  
Fly Ash ◽  
Strain Hardening ◽  
Fatigue Loading ◽  
Fiber Reinforced Concrete ◽  
Silica Sand ◽  
Cementitious Composites ◽  
Polymer Fiber ◽  
Fiber Reinforced ◽  
Engineered Cementitious Composites ◽  
Cracking Behavior

This paper presents the influence of silica sand, local crushed sand and different supplementary cementing materials (SCMs) to Portland cement (C) ratio (SCM/C) on the flexural fatigue performance of engineered cementitious composites (ECCs). ECC is a micromechanically-based designed high-performance polymer fiber reinforced concrete with high ductility which exhibits strain-hardening and micro-cracking behavior in tension and flexure. The relative high cost remains an obstacle for wider commercial use of ECC. The replacement of cement by SCMs, and the use of local sand aggregates can lower cost and enhance greenness of the ECC. The main variables of this study were: type and size of aggregates (local crushed or standard silica sand), type of SCMs (fly ash “FA” or slag), SCM/cement ratio of 1.2 or 2.2, three fatigue stress levels and number of fatigue cycles up to 1 million. The study showed that ECC mixtures produced with crushed sand (with high volume of fly ash and slag) exhibited strain hardening behavior (under static loading) with deformation capacities comparable with those made with silica sand. Class F-fly ash combined with crushed sand was the best choice (compared to class CI fly ash and slag) in order to enhance the ECC ductility with slag–ECC mixtures producing lowest deflection capacity. FA–ECC mixtures with silica sand developed more damage under fatigue loading due to higher deflection evolution than FA–ECC mixtures with crushed sand.

scholarly journals Fracture Energy, Fatigue and Creep Properties of Engineered Cementitious Composites Incorporating Fly Ash/Slag with Different Aggregates

2021 ◽  
Author(s):  
Mohamed A. A. Sherir
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Creep Behaviour ◽  
Fatigue Loading ◽  
Experimental Results ◽  
Silica Sand ◽  
Cementitious Composites ◽  
Multiple Cracking ◽  
Engineered Cementitious Composites ◽  
Number Of Cycles

This thesis investigates the influence of microsilica sand and local crushed sand, and different supplementary cementing materials on the mechanical properties of engineered cementitious composites (ECCs). ECC is a special type of high performance fiber reinforced cementitious composite with high ductility which exhibits strain-hardening and multiple-cracking behaviours in tension. The use of local aggregates in ECC production can lower its cost to mitigate the obstacles of wider commercial use. The experimental results showed that multiple-cracking behaviour was developed under fatigue loading for fly ash ECC (FA-ECC) mixtures, and the number of cracks was lower at both lower fatigue stress level and higher fatigue number of cycles. FA-ECC mixtures with silica sand exhibited higher deflection evolution under fatigue loading than FA-ECC mixtures with crushed sand. Based on the experimental results on link slab specimens, both FA-ECC mixtures with silica and crushed sands exhibited almost the same creep behaviour.

scholarly journals Fracture Energy, Fatigue and Creep Properties of Engineered Cementitious Composites Incorporating Fly Ash/Slag with Different Aggregates

2021 ◽  
Author(s):  
Mohamed A. A. Sherir
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Creep Behaviour ◽  
Fatigue Loading ◽  
Experimental Results ◽  
Silica Sand ◽  
Cementitious Composites ◽  
Multiple Cracking ◽  
Engineered Cementitious Composites ◽  
Number Of Cycles

This thesis investigates the influence of microsilica sand and local crushed sand, and different supplementary cementing materials on the mechanical properties of engineered cementitious composites (ECCs). ECC is a special type of high performance fiber reinforced cementitious composite with high ductility which exhibits strain-hardening and multiple-cracking behaviours in tension. The use of local aggregates in ECC production can lower its cost to mitigate the obstacles of wider commercial use. The experimental results showed that multiple-cracking behaviour was developed under fatigue loading for fly ash ECC (FA-ECC) mixtures, and the number of cracks was lower at both lower fatigue stress level and higher fatigue number of cycles. FA-ECC mixtures with silica sand exhibited higher deflection evolution under fatigue loading than FA-ECC mixtures with crushed sand. Based on the experimental results on link slab specimens, both FA-ECC mixtures with silica and crushed sands exhibited almost the same creep behaviour.

Bond Characteristics between ECC (Engineered Cementitious Composites) and GFRP Rebars

2012 ◽  
Vol 602-604 ◽  
pp. 1010-1013
Author(s):  
Yun Cheol Choi
Keyword(s):  
Fiber Reinforced Concrete ◽  
Fiber Reinforced Polymers ◽  
Cementitious Composites ◽  
Fiber Reinforced ◽  
Engineered Cementitious Composites ◽  
Bond Slip ◽  
Glass Fiber Reinforced ◽  
Concrete Type ◽  
Gfrp Rebars ◽  
Bond Characteristics

The purpose of this study is to investigate the bond characteristics between ECC(Engineered Cementitious Composites) and GFRP(Glass Fiber Reinforced Polymers) rebars. An experimental study was carried out to investigate the bond-slip properties of the steel and GFRP rebars in ECC which was reinforced with Polyvinyl Alcohol(PVA) fibers. A total of 8 beam specimens, which was designed according to the RILEM guidelines, was tested according to the RILEM guideline. The main objective was evaluating the load versus displacement and load versus slip behavior and the bond strength regarding the influence of the following parameters : concrete type(Normal concrete and fiber reinforced concrete) and bar diameter and type. From the test results, concrete and ECC specimen presented similar behavior for steel reinforced specimen. However, GFRPO reinforced specimen show different behavior with that. Comparative study for test and equations of MC90 was carried out and code provision predicted the bond characteristics conservatively.

scholarly journals Influences of Sodium Lignosulfonate and High-Volume Fly Ash on Setting Time and Hardened State Properties of Engineered Cementitious Composites

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4779
Author(s):  
Anggun Tri Atmajayanti ◽  
Chung-Chan Hung ◽  
Terry Y. P. Yuen ◽  
Run-Chan Shih
Keyword(s):  
Fly Ash ◽  
Setting Time ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
High Volume ◽  
Cementitious Composites ◽  
Sodium Lignosulfonate ◽  
Engineered Cementitious Composites ◽  
Cracking Behavior ◽  
Setting Times

Engineered Cementitious Composites (ECC) exhibit high ductility accompanied by multiple narrow cracking behavior under uniaxial tension. The study experimentally investigated the influence of sodium lignosulfonate and high volumes of fly ash (HVFA) on the properties of fresh and hardened ECC, with the experimental variables including the amounts of fly ash, polyvinyl alcohol (PVA) fibers, and sodium lignosulfonate. The test results were discussed extensively in terms of the initial and final setting times, compressive and tensile behavior, and drying and autogenous shrinkage. The results indicated that the initial and final setting times of ECC were increased along with the sodium lignosulfonate content of up to 1%. The drying shrinkage development was governed by the first 14 days. In addition, the major autogenous shrinkage developed for more than 28 days. The amounts of fly ash, PVA fibers, and sodium lignosulfonate considerably impacted the autogenous shrinkage. Moreover, it was found that the dosage of sodium lignosulfonate at 0.5% of the weight of Portland cement optimally reduced the shrinkage and enhanced the tensile strain capacity for ECC.

scholarly journals Structural Performance And Self-Healing Behaviour Of Engineered Cementitious Composites Subjected To Fatigue Loading

2021 ◽  
Author(s):  
Shirin Ahmad
Keyword(s):  
Fly Ash ◽  
Energy Absorption ◽  
Residual Strength ◽  
Fatigue Loading ◽  
Ash Content ◽  
Evolution Rate ◽  
Cementitious Composites ◽  
Self Healing ◽  
Engineered Cementitious Composites ◽  
Energy Absorbing

This research investigates the effect of fatigue loading on the flexural performance and self-healing behaviour of beams and link slabs made of Engineered Cementitious Composites (ECC). The influences of fly ash content, types/size of sand, MgO agent, fatigue stress level/cycle and age are analyzed based on strength/deflection capacity recovery and residual strength/deflection/energy absorbing capacity. The deflection evolution rate and energy absorption capacity were much higher in ECC link slabs compared to their SCC counterparts. Higher energy absorption and deflection evolution rate were observed in mortar sand based ECC specimens during fatigue loading. ECC link slabs with mortar sand having 55% fly ash content have shown the best self-healing and fatigue performance attaining high residual strength, deflection and energy absorbing capacity of up to 98.3%, 95.4% and 97.1% of control specimens, respectively besides retaining multi-cracking characteristics. This research demonstrates viability of using ECC link slab for construction of joint-free bridges.

scholarly journals Structural Performance And Self-Healing Behaviour Of Engineered Cementitious Composites Subjected To Fatigue Loading

2021 ◽  
Author(s):  
Shirin Ahmad
Keyword(s):  
Fly Ash ◽  
Energy Absorption ◽  
Residual Strength ◽  
Fatigue Loading ◽  
Ash Content ◽  
Evolution Rate ◽  
Cementitious Composites ◽  
Self Healing ◽  
Engineered Cementitious Composites ◽  
Energy Absorbing

This research investigates the effect of fatigue loading on the flexural performance and self-healing behaviour of beams and link slabs made of Engineered Cementitious Composites (ECC). The influences of fly ash content, types/size of sand, MgO agent, fatigue stress level/cycle and age are analyzed based on strength/deflection capacity recovery and residual strength/deflection/energy absorbing capacity. The deflection evolution rate and energy absorption capacity were much higher in ECC link slabs compared to their SCC counterparts. Higher energy absorption and deflection evolution rate were observed in mortar sand based ECC specimens during fatigue loading. ECC link slabs with mortar sand having 55% fly ash content have shown the best self-healing and fatigue performance attaining high residual strength, deflection and energy absorbing capacity of up to 98.3%, 95.4% and 97.1% of control specimens, respectively besides retaining multi-cracking characteristics. This research demonstrates viability of using ECC link slab for construction of joint-free bridges.

scholarly journals Mechanical and Post-Cracking Characteristics of Fiber Reinforced Concrete Containing Copper-Coated Steel and PVA Fibers in 100% Cement and Fly Ash Concrete

2021 ◽  
Vol 11 (3) ◽  
pp. 1048
Author(s):  
Asif Jalal ◽  
Luqmanul Hakim ◽  
Nasir Shafiq
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Fly Ash ◽  
Fiber Reinforced Concrete ◽  
Coated Steel ◽  
Fiber Reinforced ◽  
Cement Concrete ◽  
Cracking Behavior ◽  
Fly Ash Concrete ◽  
Cracking Characteristics

This experimental study investigated the effects of polyvinyl alcohol (PVA) and copper-coated steel (CCS) on the mechanical properties and the post cracking behavior of fiber reinforced concrete (FRC). In designing high-performance concrete mixes, cement replacement materials are the essential ingredients. Therefore, the research objective was to investigate PVA and CCS fiber’s post-cracking performance in 100% cement concrete and concrete with 80% cement and 20% fly ash. The fiber content was fixed as a 0.3% volumetric fraction. CSS fibers required 15% more superplasticizer to achieve the desired slump of fresh concrete than the PVA fibers. Simultaneously, CCS fibers showed a 10% higher compressive strength than the concrete made of PVA fibers. Both fibers exhibited a similar effect in developing tensile and flexural strength. PVA fibers showed a value of 47 Gpa of secant modulus, and CCS fibers resulted in 37 Gpa in 100% cement concrete. In post-cracking behavior, CCS fibers showed better performance than the PVA fibers. The reason for this is that CCS showed 2.3 times the tensile strength of the PVA fibers. In comparing the two concretes, fly ash concrete showed about 10% higher compressive strength at 56 days and about 6% higher tensile and flexural strength. Similarly, fly ash concrete showed more than 15% first crack strength and flexural toughness than the 100% cement concrete in post-cracking behavior. Fiber-reinforced concrete containing PVA or CCS fibers showed enhanced post-cracking characteristics and its use could be preferred in structural applications.

Sign in / Sign up

Export Citation Format

Share Document