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.

Mechanical Properties of Modified Engineered Cementitious Composites (MECC) Incorporating Marble Dust

2021 ◽  
Vol 9 (8) ◽  
pp. 1140-1146
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Bottom Surface ◽  
Cementitious Composites ◽  
Strength Development ◽  
Shape Effect ◽  
Main Concern ◽  
Engineered Cementitious Composites ◽  
Flexure Strength ◽  
Marble Dust

Engineered cementitious composites (ECC) are a type of high-performance fiber reinforced cementitious composite. ECC has different applications in the construction field due to its inherent characteristics of high tensile strain. The main concern regarding ECC is its high cost. The content of cement is high contributing to its cost. In this research work, the cement in ECC is replaced with marble dust and its mechanical properties such as compressive strength and flexure strength have been assessed. For this purpose, both cubes and cylinders were tested at different test ages for finding the compressive strength development with time and observe the shape effect of specimens on the compressive strength of ECC mixes. Beam members were tested for finding the flexure strength of ECC mixes. Deflection gauge was also installed at the mid span on the bottom surface of the beams to find the maximum mid span deflection before failure. The compression test results of both cylinders and cubes revealed that using of marble dust has negative effect on the compressive strength of ECC. The flexure strength result showed that marble dust can be used up to some extent replacing cement will increase the flexure strength. The result of mid span deflection suggests that by incorporating marble dust in ECC, its ductility increases.

Mechanical Performances of Green Engineered Cementitious Composites Incorporating Various Types of Sand

2019 ◽  
Vol 821 ◽  
pp. 512-517
Author(s):  
Siong Wee Lee ◽  
Chai Lian Oh ◽  
Mohd Raizamzamani Md Zain ◽  
Norrul Azmi Yahya ◽  
Azerai Ali Rahman
Keyword(s):  
Compressive Strength ◽  
Recycled Concrete ◽  
Cementitious Composites ◽  
Flexural Stress ◽  
Engineered Cementitious Composites ◽  
River Sand ◽  
Granulated Blast Furnace Slag ◽  
In Series ◽  
Mechanical Performances ◽  
Flexural Tests

This paper evaluates the mechanical performances of green engineered cementitious composites (ECC) by means of compressive strength and flexural behaviour. Green ECC made of cement, ground granulated blast-furnace slag (GGBS), river sand or recycled concrete fine (RCF), polypropylene (PP) fiber, water and superplasticizer (SP) was employed in this study. Compression test result implies that green ECC incorporating either sieved river sand or sieved RCF (below 600 μm) in series G60 and G70 exhibited greater compressive strength compared with green ECC with unsieved river sand. In series G80, compressive strength of green ECC was not affected by RCF content. Flexural stress-mid deflection curves demonstrated that all green ECC specimens performed more ductile compared to normal concrete as they undergone large deformation capacity after the first cracking strength. Both compression and flexural tests suggested that mixture G80SRCF0.4 containing large amount of sieved RCF and least amount of cement is the best green ECC mixture in this study.

scholarly journals Development of Engineered Cementitious Composites Using Sea Sand and Metakaolin

2021 ◽  
Vol 8 ◽  
Author(s):  
Qiyao Yao ◽  
Zuo Li ◽  
Chenyu Lu ◽  
Linxin Peng ◽  
Yuejing Luo ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fracture Energy ◽  
Tensile Strain ◽  
Chloride Ions ◽  
Silica Sand ◽  
Cementitious Composites ◽  
Engineered Cementitious Composites ◽  
Strain Capacity ◽  
Sea Sand ◽  
Tensile Strain Capacity

The present study investigates the possibility of using sea sand, instead of silica sand, in producing engineered cementitious composites (ECCs) and the optimal mix proportion, mechanical behavior, and erosive effect of chloride ions on sea sand ECCs (SECCs). Nine groups of SECC specimens were prepared based on the orthogonal test design, and these cured for the uniaxial tensile, uniaxial compression, and fracture energy tests. The roundness and sphericity of sea sand and silica sand were quantified by digital microscopy. The microstructure and composition of SECCs were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The mix proportions of SECCs with a tensile strain capacity more than 2% and a compressive strength more than 60 MPa were obtained. The factor analysis of these serial tests revealed that the contents of both fly ash and sea sand have a significant effect on the compressive strength and tensile strain capacity of SECCs. The fracture energy test revealed that the matrix fracture toughness of SECCs significantly increases with the increase in sea sand content. The XRD analysis revealed that the addition of metakaolin can enhance the ability of SECCs to bind chloride ions, and with the increase in chloride ion content, the ability of SECCs to bind chloride ions would improve. The results of the present study provide further evidence of the feasibility of using sea sand in the production of ECCs, in order to meet the requirements of diverse concrete components on ductility and durability.

scholarly journals Non Destructive Studies on Engineered Cementitious Composites using Microsilica & Polypropylene Fibre

2019 ◽  
Vol 8 (2S5) ◽  
pp. 18-21
Keyword(s):  
Compressive Strength ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Mineral Admixture ◽  
Cementitious Composites ◽  
Engineered Cementitious Composites ◽  
Polypropylene Fibres ◽  
Curing Regimes ◽  
Non Destructive

This study focuses on assessing the durability property of engineered cementitious composites using Ultrasonic pulse velocity method (direct and semi direct) to compute the compressive strength. Even the effect of mineral admixture on the mortar properties for different curing regimes shall be determined using this method. Mortar specimens containing microsilica in different percentages ranging from 5% to 25%, replacing portland cement by weight and adding polypropylene fibres ranging from 0.5% to 2% are chosen for evaluation. 20% of microsilica and 2% of polypropylene fibres induced to increase the range of UPV from 3463 m/s to 3505 m/s for 7 and 28 day curing regimes and also the compressive strength significantly improved for the above constituent. However there was a marginal decrease in the compressive strength and UPV outcomes when cement is replaced by microsilica greater than 20%. A relationship had been framed between ultrasound pulse velocity and compressive strength.

Compressive behavior of steel spiral confined engineered cementitious composites in circular columns

2020 ◽  
Vol 23 (14) ◽  
pp. 3075-3088
Author(s):  
Wei Hou ◽  
Guan Lin ◽  
Xiaomeng Li ◽  
Pandeng Zheng ◽  
Zixiong Guo
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
Uniaxial Tensile ◽  
Cementitious Composites ◽  
Test Results ◽  
Cementitious Composite ◽  
Compression Tests ◽  
Compressive Behavior ◽  
Engineered Cementitious Composites ◽  
Engineered Cementitious Composite

Extensive research has been conducted on the uniaxial tensile and compressive behavior of engineered cementitious composites. Despite the high tensile ductility and high toughness of engineered cementitious composites, transverse steel reinforcement is still necessary for high-performance structural members made of engineered cementitious composites. However, very limited research has been concerned with the compressive behavior of steel-confined engineered cementitious composites. This article presents the results of axial compression tests on a series of circular engineered cementitious composite columns confined with steel spirals. The test variables included the engineered cementitious composite compressive strength, the spiral pitch, and the spiral yield stress. The test results show that steel-confined engineered cementitious composites in the test columns exhibited a very ductile behavior; the steel spiral confinement contributed effectively to the enhancement of both strength and ductility of engineered cementitious composites. The test results were then interpreted by comparing them with the predictions from some existing models. It was found that the existing models previously developed for confined concrete failed to predict the compressive strength of steel-confined engineered cementitious composites with sufficient accuracy. New fitting equations for the compressive properties of steel-confined engineered cementitious composites were then obtained on the basis of the test results of this study as well as those from an existing study.

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.

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