Investigation of the efficacy of nano-silica on mechanical properties of Green-Engineered Cementitious Composite (GECC) containing high volume natural zeolite

Strain-hardening cementitious composite (SHCC) is a kind of construction material that exhibits multiple cracking and strain-hardening behaviors. The partial replacement of cement with fly ash is beneficial to the formation of the tensile strain-hardening property of SHCC, the increase of environmental greenness, and the decrease of hydration heat, as well as the material cost. This study aimed to develop a sustainable construction material using a high dosage of fly ash (no less than 70% of the binder material by weight). Based on the micromechanics analysis and particle size distribution (PSD) optimization, six mixes with different fly ash to cement ratios (2.4–4.4) were designed. The mechanical properties of the developed high-volume fly ash SHCCs (HVFA-SHCCs) were investigated through tensile tests, compressive tests, and flexural tests. Test results showed that all specimens exhibited multiple cracking and strain-hardening behaviors under tension or bending, and the compressive strength of the designed mixes exceeded 30MPa at 28 days, which is suitable for structural applications. Fly ash proved to be beneficial in the improvement of tensile and flexural ductility, but an extremely high volume of fly ash can provide only limited improvement. The HVFA-SHCC mix FA3.2 (with fly ash to binder ratio of about 76% by weight) designed in this study is suggested for structural applications.

Download Full-text

Effect of Different Cooling Regimes on the Mechanical Properties of Cementitious Composites Subjected to High Temperatures

The Scientific World JOURNAL ◽

10.1155/2014/289213 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Jiangtao Yu ◽

Wenfang Weng ◽

Kequan Yu

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Scanning Electron Microscopy ◽

High Temperature ◽

Significant Influence ◽

Microstructural Characterization ◽

Cementitious Composite ◽

Engineered Cementitious Composite ◽

Before And After ◽

Scanning Electron

The influence of different cooling regimes (quenching in water and cooling in air) on the residual mechanical properties of engineered cementitious composite (ECC) subjected to high temperature up to 800°C was discussed in this paper. The ECC specimens are exposed to 100, 200, 400, 600, and 800°C with the unheated specimens for reference. Different cooling regimens had a significant influence on the mechanical properties of postfire ECC specimens. The microstructural characterization was examined before and after exposure to fire deterioration by using scanning electron microscopy (SEM). Results from the microtest well explained the mechanical properties variation of postfire specimens.

Download Full-text

Mechanical Properties and Shear Strengthening Capacity of High Volume Fly Ash-Cementitious Composite

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/310/1/012063 ◽

2018 ◽

Vol 310 ◽

pp. 012063 ◽

Cited By ~ 1

Author(s):

Aswin K Joseph ◽

K B Anand

Keyword(s):

Mechanical Properties ◽

Fly Ash ◽

High Volume ◽

Cementitious Composite ◽

Shear Strengthening ◽

High Volume Fly Ash

Download Full-text

Mechanical Properties and Applications of Engineered Cementitious Composites (ECC)

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.2889 ◽

2013 ◽

Vol 405-408 ◽

pp. 2889-2892 ◽

Cited By ~ 1

Author(s):

Zhi Qin Zhao ◽

Ren Juan Sun ◽

Zi Qiang Feng ◽

Shan Shan Wei ◽

Da Wei Huang

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Bending Strength ◽

Construction Material ◽

Shear Load ◽

High Ductility ◽

Cementitious Composite ◽

Engineered Cementitious Composite ◽

Scale Field ◽

Reinforced Cement

Engineered Cementitious Composite (ECC) is a fiber reinforced cement based composite material, which systematically designed on the basis of micromechanics and engineered to achieve high ductility under tensile and shear load. The article introduced the development of ECC as advanced construction material, shown different mechanical properties of ECC, tensile strength, compressive strength, bending strength, shear strength. And in light of recent and future full-scale field applications of ECC were also summarized.

Download Full-text

Effect of Fibre Types on the Tensile Behaviour of Engineered Cementitious Composites

Frontiers in Materials ◽

10.3389/fmats.2021.775188 ◽

2021 ◽

Vol 8 ◽

Author(s):

Mingzhang Lan ◽

Jian Zhou ◽

Mingfeng Xu

Keyword(s):

Mechanical Properties ◽

Experimental Result ◽

Tensile Behaviour ◽

Cementitious Composites ◽

Matrix Interface ◽

Cementitious Composite ◽

Engineered Cementitious Composite ◽

Fibre Bridging ◽

The Difference ◽

Fibre Matrix

Engineered cementitious composite (ECC) is a group of ultra-ductile fibre-reinforced cementitious composites, characterised by high ductility and moderate content of short discontinuous fibre. The unique tensile strain-hardening behaviour of ECC results from a deliberate design based on the understanding of micromechanics between fibre, matrix, and fibre–matrix interface. To investigate the effect of fibre properties on the tensile behaviour of ECCs is, therefore, the key to understanding the composite mechanical behaviour of ECCs. This paper presents a study on the fibre-bridging behaviour and composite mechanical properties of ECCs with three types of fibres, including oil-coated polyvinyl alcohol (PVA) fibre, untreated PVA fibre, and polypropylene (PP) fibre. The experimental result reveals that various fibres with different properties result in difference in the fibre-bridging behaviour and composite mechanical properties of ECCs. The difference in the composite mechanical properties of ECCs with different fibres was interpreted by analysing the fibre-bridging behaviour.

Download Full-text

The mechanical properties of engineered cementitious composites containing limestone powder replaced by microsilica sand

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2012-0281 ◽

2013 ◽

Vol 40 (2) ◽

pp. 151-157 ◽

Cited By ~ 16

Author(s):

Kazim Turk ◽

Serhat Demirhan

Keyword(s):

Mechanical Properties ◽

Silica Sand ◽

Limestone Powder ◽

Experimental Program ◽

Cementitious Composite ◽

Engineered Cementitious Composite ◽

Four Levels ◽

Positive Effect ◽

Composite Properties ◽

Reference Mixture

In this study, an experimental program is conducted to understand the effect of the limestone powder (LSP) content replaced by silica sand on the composite properties. For this purpose, five different engineered cementitious composite (ECC) mixtures were adopted: ECC mixture with only silica sand (SS) for control purposes and four ECC mixtures in which SS is partially replaced by four levels of replacements (25%, 50%, 75%, and 100% by weight of total SS) of LSP. The properties of ECC mixtures produced were investigated for the ages of 3, 28, and 90 days. It was concluded that the mechanical properties of the ECC mixtures with LSP were in general higher than the reference mixture with only SS for all curing ages. Increase in the LSP content had a positive effect on the performance of the compressive strength, fracture toughness, and flexural strength at the ages of 3 and 28 days while this was not valid at the age of 90 days when compared to the reference mixture. Also, the ductility of the ECC beams strongly depends on the LSP content and specimen age.

Download Full-text

Experimental Investigation on the Mechanical Properties and Microstructure of Basalt Fiber Reinforced Engineered Cementitious Composite

Materials ◽

10.3390/ma13173796 ◽

2020 ◽

Vol 13 (17) ◽

pp. 3796

Author(s):

Qiang Du ◽

Changlu Cai ◽

Jing Lv ◽

Jiao Wu ◽

Ting Pan ◽

...

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Flexural Strength ◽

Basalt Fiber ◽

Sem Analysis ◽

Splitting Tensile Strength ◽

Cementitious Composite ◽

Fiber Reinforced ◽

Bond Quality ◽

Engineered Cementitious Composite

This study investigated fundamental mechanical properties of a basalt fiber reinforced engineered cementitious composite (BF-ECC) with different volume fractions of basalt fiber (BF), water–binder ratio (W/B) and fly ash (FA) content. The compressive strength, splitting tensile strength, flexural strength and static modulus of BF-ECC were studied at 3, 28 and 56 days, respectively, to explore their development along the ages. Furthermore, the scanning electron microscopy (SEM) analysis was conducted to evaluate the microstructure of BF-ECC. Experiment results demonstrated that bond quality between the BF and the matrix is good, which leads to a significant increase in the flexural strength and splitting tensile strength. The pozzolanic effect of FA obviously improved the splitting tensile and flexural strength of BF-ECC after 56 days of curing, and the appropriate content of the FA content in the BF-ECC ranges from 50% to 60%.

Download Full-text

Chemical attack on concrete containing a high volume of crumb rubber as a partial replacement to fine aggregate in engineered cementitious composite (ECC)

Canadian Journal of Civil Engineering ◽

10.1139/cjce-2020-0343 ◽

2021 ◽

Author(s):

Wesam Salah Alaloul ◽

Muhammad Ali Musarat ◽

Sani Haruna ◽

Bassam Tayeh ◽

Muhammad Nurzahin Bin Norizan

Keyword(s):

Compressive Strength ◽

High Volume ◽

Crumb Rubber ◽

Cementitious Materials ◽

Partial Replacement ◽

Fine Aggregate ◽

Cementitious Composite ◽

Conventional Concrete ◽

Engineered Cementitious Composite ◽

Chemical Attack

This research has been conducted where the focus is on the chemical attack towards the Engineered Cementitious Composite (ECC) containing a high volume of the crumb rubber in terms of durability, behaviour, and comparison with conventional concrete. Two variables have been considered in developing rubberized ECC mixtures, i.e. the amount of crumb rubber as a replacement to fine aggregate by volume of 0-30% and PVA fibres by volume of 0-2% to cementitious materials. The resistance properties of ECC incorporating crumb rubber were investigated for 13 different variable combinations developed by Response Surface Methodology (RSM). The experimental results revealed that the presence of crumb rubber in the ECC matrix enhanced the resistance of the ECC in both acidic and sulphate environments. It was also revealed that by incorporating 15% of crumb rubber, the loss of compressive strength significantly reduced from 38% to 15%

Download Full-text