scholarly journals Investigation of Flexural Behavior of Engineered Cementitious Composites

2018 ◽  
Vol 7 (1) ◽  
pp. 84-87
Author(s):  
V. Selvapriya .
Keyword(s):  
Construction Industry ◽  
Drying Shrinkage ◽  
Fiber Reinforced Concrete ◽  
Flexural Behavior ◽  
Cementitious Composites ◽  
Volume Changes ◽  
Engineered Cementitious Composites ◽  
New Class ◽  
Micro Cracks ◽  
New Material

Traditional concrete is brittle, rigid and less durable. The search for the new material in construction industry results in the development of new class of Fiber Reinforced Concrete (FRC), known as Engineered Cementitious Composites (ECC). They impart ductility and durability to the structure. In concrete structural cracks develop even before loading, particularly due to drying shrinkage or other causes of volume changes. When loaded, the micro cracks propagate and open up, and owing to the effect of stress concentration, additional cracks form in places of minor defects. The development of micro cracks is the main cause of inelastic deformation in concrete. This paper deals with flexural behavior of ECC.

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 Self-Healing Concrete Mix-Design Based on Engineered Cementitious Composites Principles

Proceedings ◽  
2020 ◽  
Vol 63 (1) ◽  
pp. 5
Author(s):  
Tudor Panfil Toader ◽  
Anamaria Cătălina Mircea
Keyword(s):  
Construction Industry ◽  
Raw Materials ◽  
Mix Design ◽  
Cementitious Composites ◽  
Self Healing ◽  
Engineered Cementitious Composites ◽  
Concrete Mix Design ◽  
External Agents ◽  
Concrete Mix ◽  
Healing Property

Concrete is the most used material in the construction industry, being prone to cracking. Following the action of aggressive external agents, through cracks, access routes to the embedded reinforcement are created. By enclosing in concrete various materials that can induce the self-healing property, by taking actions when the cracks appear, the access of the external aggressive agents to the reinforcement can be stopped, therefore creating more durable materials. The aim of the research is to design a micro concrete with self-healing properties, based on Engineered Cementitious Composites principles from the literature and using local raw materials.

Effects of Gradation of Sand on the Mechanical Properties of Engineered Cementitious Composites

2011 ◽  
Vol 250-253 ◽  
pp. 374-378
Author(s):  
Ying Zi Yang ◽  
Yan Yao ◽  
Yu Zhu
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Peak Load ◽  
Drying Shrinkage ◽  
Bending Test ◽  
Cementitious Composites ◽  
Paper Test ◽  
Engineered Cementitious Composites ◽  
Load Peak ◽  
Fineness Modulus

Four-point bending test was employed to investigate the effects of gradation of sand on the mechanical properties of Engineered Cementitious Composites (ECC). The characteristics of ECC such as mid-span deflection, first cracking load, peak load and fracture toughness were obtained from the load-deflection curve. Effects of gradation of sand on fresh properties, compressive strength, flexural strength and drying shrinkage of ECC were also discussed in this paper. Test results shown that when the fineness modulus of sand in ECC was 1.0, the mid-span deflection and fracture toughness of ECC increased nearly 1.5 times and 2 times that of ECC with the sand fineness modulus of 2.97, respectively. With the sand getting finer, the more superplascitizer is needed and the crack width of ECC becomes smaller. The drying shrinkage of ECC with 2.97 and 1.0 fineness modulus of sand at 24 days was 8×10-4 and 15.6×10-4, respectively.

scholarly journals The Effect of Elevated Temperature on Engineered Cementitious Composite Microstructural Behavior: An Overview

2022 ◽  
Vol 30 (1) ◽  
pp. 433-449
Author(s):  
Mohamad Hakimin Khazani ◽  
Oh Chai Lian ◽  
Lee Siong Wee ◽  
Mohd Raizamzamani Md Zain ◽  
Norrul Azmi Yahya
Keyword(s):  
Compressive Strength ◽  
Elevated Temperature ◽  
Cementitious Composites ◽  
Engineered Cementitious Composites ◽  
Scientific Publications ◽  
The Past ◽  
Micro Cracks ◽  
Bibliographic Data ◽  
Literature Reviews ◽  
Microstructural Behavior

This paper discusses the quantitative bibliographic data derived from scientific publications on Engineered Cementitious Composites (ECC) subjected to elevated temperature, the influence of elevated temperature on the mechanical properties, particularly the compressive strength and microstructure behavior of Engineered Cementitious Composites (ECC) mixtures based on the review of previous pieces of literature. Systematic literature reviews were employed as the methodology in this study. The age of related publications selected to be reviewed was limited to publications for the past ten years, 2010 to December 2020. It was found from available research that exposure of the ECC specimen at the elevated temperature starting from 200oC significantly reduced the compressive strength when the temperature increases, melting of fiber and increase of porosity causes the dramatically increase micro-cracks.

Shrinkage Characteristics of Green Engineered Cementitious Composites with Varying Palm Oil Fuel Ash Contents and Water-Binder Ratios

2012 ◽  
Vol 626 ◽  
pp. 245-249 ◽  
Author(s):  
Nurdeen M. Altwair ◽  
M.A. Megat Johari ◽  
Syed Fuad Saiyid Hashim
Keyword(s):  
Palm Oil ◽  
Drying Shrinkage ◽  
Shrinkage Strain ◽  
Extensive Study ◽  
Cementitious Composites ◽  
Engineered Cementitious Composites ◽  
Palm Oil Fuel Ash ◽  
Fuel Ash ◽  
The Matrix ◽  
Oil Fuel

The present paper is a part of an extensive study on green palm oil fuel ash engineered cementitious composites conducted at Universiti Sains Malaysia. It specifically investigates the effects of waterbinder ratio (w/b) and palm oil fuel ash (POFA) on the drying shrinkage of engineered cementitious composites (ECCs). W/b values of 0.33, 0.36, and 0.38 were selected. ECC mixes were proportioned to have various ratios of POFA ranging from 0 to 1.2 from the mass of cement. The drying shrinkage measurements were taken at 4, 11, 18, 25, 57, and 90 days. The experimental results show that w/b has a significant effect on the drying shrinkage of the ECC mixtures. Drying shrinkage is remarkably reduced with a decrease in the w/b. The results also showed that drying shrinkage of the composites is considerably reduced when POFA is used in the matrix. The measured drying shrinkage strain at 90 days is only 920×10-6 µε to 1216×10-6 µε for ECC mixtures with high POFA content. The shrinkage strain of the ECC mixtures without POFA at 90 days is nearly 1597×10-6 µε to 1910×10-6 µε.

scholarly journals Properties of Rubberized Engineered Cementitious Composites Containing Nano-Silica

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3765
Author(s):  
Rubendran Loganathan ◽  
Bashar S. Mohammed
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Flexural Strength ◽  
Drying Shrinkage ◽  
Poisson's Ratio ◽  
Cementitious Composites ◽  
Nano Silica ◽  
Engineered Cementitious Composites ◽  
Direct Tensile ◽  
Direct Tensile Strength

To avoid explosive spalling during elevated temperature, crumb rubber (CR) is being added to the manufacturing of engineered cementitious composites (ECC). However, the addition of CR particles adversely affects the mechanical properties of ECC. Therefore, to overcome this issue, nano-silica (NS) is added into rubberized ECC mixture as cementitious material additives. Response surface methodology (RSM) has been utilized to optimize the mixtures of the rubberized ECC with variables: CR (0, 2.5, and 5 vol.%), polyvinyl alcohol (PVA) fiber (0, 1, and 2 vol.%), NS (0, 1, and 2 vol.%), and fly ash (0, 25, and 50 vol.%). The experimentally measured responses are flexural strength, direct tensile strength, elastic modulus, Poisson’s ratio, creep, and drying shrinkage. Mathematical models to predict the targeted responses have been developed using RSM. As a result, a high correlation between the factors and responses has been exhibited by the developed models and the accuracy of fit, where less than 9.38% of the variation was found between the predicted and validated results. The experimental results revealed that the rubberized ECC with the incorporation of nano-silica exhibited a higher compressive strength, direct tensile strength, flexural strength, elastic modulus, Poisson’s ratio, and lower drying shrinkage.

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.

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