Physical and Chemical Actions of Nano-Mineral Additives on Properties of High-Volume Fly Ash Engineered Cementitious Composites

Al-Najjar, Y.; Yeşilmen, Seda; Al-Dahawi, Ali; Şahmaran, Mustafa; Yıldırım, Gürkan; Lachemi, Mohamed; Amleh, Lamya

doi:10.14359/51689114

Cited by 17 publications

(14 citation statements)

References 41 publications

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“…Nano silica (NS) ordered from Norway was used as a partial replacement to improve the chemical resistance of the GPC (Lloyd and Rangan, 2010). Previous studies reported the use of NS in NC specimens due to its beneficial effect on the durability and mechanical performance (Al-Najjar et al, 2016; Yeşilmen et al, 2015; Yıldırım et al, 2018). It was also reported by Adak et al (2014) that addition of 6% NS increased the compressive strength of GPC.…”

Section: Experimental Studiesmentioning

confidence: 99%

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

Alzeebaree

Çevik

Mohammedameen

et al. 2019

Advances in Structural Engineering

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In the study, mechanical properties and durability performance of confined/unconfined geopolymer concrete and ordinary concrete specimens were investigated under ambient and seawater environments. Some of the specimens were confined by carbon fiber and basalt fiber–reinforced polymer fabric materials with one layer and three layers under chloride and ambient environments to observe mechanical strength contribution and durability performances of these hybrid types of materials. These fiber-reinforced polymer fabric materials were also evaluated in terms of retrofit purposes especially in the marine structures. In addition, microstructural evaluation is also conducted using scanning electron microscope on geopolymer concrete and ordinary concrete specimens to observe the amount of deterioration in microscale due to the chloride attacks. Results indicated that confined specimens exhibited enhanced strength, ductility, and durability properties than unconfined specimens, and the degree of the enhancement depended on the fiber-reinforced polymer confinement type and the number of fiber-reinforced polymer layer. Specimens confined by carbon fabrics with three layers showed superior mechanical properties and durability performance against chloride attack, while specimens confined by basalt fabrics with one layer exhibited low performance, and unconfined specimens showed the worst performance. Both fiber-reinforced polymer fabric materials can be utilized as retrofit materials in structural elements against chloride attacks. The results also pointed out that seawater attack reduced the ductility performance of the geopolymer concrete and ordinary concrete specimens. Furthermore, geopolymer concrete specimens were found more durable than the ordinary concrete specimens, and both types of concretes exhibited similar fracture properties, indicating that geopolymer concrete can be utilized for structural elements instead of ordinary concretes.

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Section: Experimental Studiesmentioning

confidence: 99%

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

Alzeebaree

Çevik

Mohammedameen

et al. 2019

Advances in Structural Engineering

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“…With specified cementitious matrix and PVA fiber, balance within hydrated cement paste matrix and fiber–matrix interface characteristics plays a pivotal role in the behavior of ECC under loading conditions 12,13 . Therefore, more densified and compacted microstructure and fiber–matrix interface (namely, a higher packing density achieved by mineral additions, additional hydration products, and so on) promote the higher flexural performance of engineered cementitious composites 14–16 …”

Section: Introductionmentioning

confidence: 99%

Effect of different nanosized limestone formations on fiber‐matrix interface properties of engineered cementitious composites

Demirhan

2022

Structural Concrete

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Eight different ECC mixtures were produced by the utilization of three types of nanosized limestone formations as uncoated nanosized calcite (UNC), nano-CaCO 3 (NCC), and coated nanosized calcite (CNC) and also two aggregate to binder volume fractions (A/B) of 0.36 and 0.45. Mechanical properties in terms of compressive strength and flexural characteristics (flexural strength, mid-span beam deflection, and flexural toughness) were investigated at the curing ages of 7, 28, and 90 days. It was revealed that ECC mixtures modified by nanomaterials exhibited better mechanical and flexural properties regardless of curing age and type of nanosized limestone formation. ECC mixtures modified by UNC showed better contributions. Both parameters, namely curing ECC samples in air conditions and utilization of low water to binder ratio in the production of ECC mixtures, were seen as key-determinant factors through reported results. Thus, these two variables drive the nanosized limestone formations to behave mainly as a filler material instead of exhibiting the expected mechanism.

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“…Nanomaterials have excellent physical and chemical properties and have been widely used in the field of cementitious composites [ 8 , 9 , 10 , 11 ]. Nanomaterials not only improve the macroscopic properties of cement mortars, but also regulate the crystalline morphology of cement hydration products through nucleation [ 12 ], thus achieving control of the hydration process of cement.…”

Section: Introductionmentioning

confidence: 99%

“…Non-covalent bonding modification can also be used to improve the dispersion of graphene by surface modification of graphene. Non-covalent bonding modification maintains the original structure and anisotropy of graphene as much as possible, which is more beneficial than covalent bonding modification for the application of graphene in various materials [ 8 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

Zhang

Wang

et al. 2021

Materials

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Graphene’s outstanding properties make it a potential material for reinforced cementitious composites. However, its shortcomings, such as easy agglomeration and poor dispersion, severely restrict its application in cementitious materials. In this paper, a highly dispersible graphene (TiO2-RGO) with better dispersibility compared with graphene oxide (GO) is obtained through improvement of the graphene preparation method. In this study, both GO and TiO2-RGO can improve the pore size distribution of cement mortars. According to the results of the mercury intrusion porosity (MIP) test, the porosity of cement mortar mixed with GO and TiO2-RGO was reduced by 26% and 40%, respectively, relative to ordinary cement mortar specimens. However, the TiO2-RGO cement mortars showed better pore size distribution and porosity than GO cement mortars. Comparative tests on the strength and durability of ordinary cement mortars, GO cement mortars, and TiO2-RGO cement mortars were conducted, and it was found that with the same amount of TiO2-RGO and GO, the TiO2-RGO cement mortars have nearly twice the strength of GO cement mortars. In addition, it has far higher durability, such as impermeability and chloride ion penetration resistance, than GO cement mortars. These results indicate that TiO2-RGO prepared by titanium dioxide (TiO2) intercalation can better improve the strength and durability performance of cement mortars compared to GO.

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Physical and Chemical Actions of Nano-Mineral Additives on Properties of High-Volume Fly Ash Engineered Cementitious Composites

Cited by 17 publications

References 41 publications

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

Mechanical performance of FRP-confined geopolymer concrete under seawater attack

Effect of different nanosized limestone formations on fiber‐matrix interface properties of engineered cementitious composites

Effect of High-Dispersible Graphene on the Strength and Durability of Cement Mortars

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