Influence of blended powders on properties of Ultra-High Strength Fibre Reinforced Self Compacting Concrete subjected to elevated temperatures

Saif, Mohamed S.; Shanour, Ali S.; Abdelaziz, G. E.; Elsayad, Hanaa I.; Shaaban, Ibrahim G.; Tayeh, Bassam A.; Hammad, Mahmoud S.

doi:10.1016/j.cscm.2022.e01793

Cited by 18 publications

(9 citation statements)

References 88 publications

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“…Normal concrete as a building material has appreciable heat resistance with a very low value of thermal conductivity [ 54 ]. However, at elevated temperatures greater than 300 °C, the strength properties of concrete deteriorate, and at 600 °C, concrete loses its structural performance [ 55 , 56 , 57 ]. The deterioration mechanism for concrete exposed to elevated temperature results from a volume change with aggregate expansion (due to heat) versus cement paste shrinkage (due to water evaporation) [ 58 ].…”

Section: Improvement In the Heat Resistance Of Concrete With Nanomate...mentioning

confidence: 99%

An Elucidative Review of the Nanomaterial Effect on the Durability and Calcium-Silicate-Hydrate (C-S-H) Gel Development of Concrete

Al-saffar,

Wong,

Paul

2023

Gels

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Concrete as a building material is susceptible to degradation by environmental threats such as thermal diffusion, acid and sulphate infiltration, and chloride penetration. Hence, the inclusion of nanomaterials in concrete has a positive effect in terms of promoting its mechanical strength and durability performance, as well as resulting in energy savings due to reduced cement consumption in concrete production. This review article discussed the novel advances in research regarding C-S-H gel promotion and concrete durability improvement using nanomaterials. Basically, this review deals with topics relevant to the influence of nanomaterials on concrete’s resistance to heat, acid, sulphate, chlorides, and wear deterioration, as well as the impact on concrete microstructure and chemical bonding. The significance of this review is a critical discussion on the cementation mechanism of nanoparticles in enhancing durability properties owing to their nanofiller effect, pozzolanic reactivity, and nucleation effect. The utilization of nanoparticles enhanced the hydrolysis of cement, leading to a rise in the production of C-S-H gel. Consequently, this improvement in concrete microstructure led to a reduction in the number of capillary pores and pore connectivity, thereby improving the concrete’s water resistance. Microstructural and chemical evidence obtained using SEM and XRD indicated that nanomaterials facilitated the formation of cement gel either by reacting pozzolanically with portlandite to generate more C-S-H gel or by functioning as nucleation sites. Due to an increased rate of C-S-H gel formation, concrete enhanced with nanoparticles exhibited greater durability against heat damage, external attack by acids and sulphates, chloride diffusion, and surface abrasion. The durability improvement following nanomaterial incorporation into concrete can be summarised as enhanced residual mechanical strength, reduced concrete mass loss, reduced diffusion coefficients for thermal and chloride, improved performance against sulphates and acid attack, and increased surface resistance to abrasion.

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Section: Improvement In the Heat Resistance Of Concrete With Nanomate...mentioning

confidence: 99%

An Elucidative Review of the Nanomaterial Effect on the Durability and Calcium-Silicate-Hydrate (C-S-H) Gel Development of Concrete

Al-saffar,

Wong,

Paul

2023

Gels

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“…Increasing the number of shear ties escalates production costs and overall life-cycle expenses [28]. The cohesive properties of the concrete predominantly withstand the forces when stress builds up in the interface [29].…”

Section: Introductionmentioning

confidence: 99%

Effect of Steel Fibers on the Interfacial Shear Strength of Flyash and GGBS based Geopolymer concrete activated with water glass

Sangi,

Bollaprag

2024

Preprint

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Concrete, a fundamental construction material, heavily relies on cement, manufacturing process of cement results in significant CO2 emissions, posing environmental concerns. Hence, exploring substitutes for cement becomes imperative to mitigate CO2 emissions. Geopolymer materials emerge as promising alternatives capable of entirely replacing Ordinary Portland Cement (OPC). However, these materials necessitate activators to initiate the polymerization reaction. While Na2SiO3 and NaOH are commonly utilized as activators, their cost-effectiveness is questionable. Moreover, when Ground Granulated Blast Furnace Slag (GGBS) reacts rapidly with these activators. To address these issues and streamline concrete production, "water glass" is employed as an activator, offering a solution to avoid rapid setting and economize the production process. In other hand the production of mass concrete structures, interfaces and joints critical points where cracks may develop. To ensure monolithic behavior, shear ties were advised at the interface in order to establish strong bond strength. However, the efficiency of construction could be decreased by adding more shear ties. The purpose of this study is to evaluate the interfacial shear strength of Geopolymer concrete(GPC), With the addition of different percentages (0.5,1%, 1.5%, and 2%), and 30mm length of crimpled steel fibers together with shear ties at the interface of push-off specimens. The findings reveal that it is viable to replace two shear ties with one 8mm-2L shear tie and 1% crimped steel fibers of 30mm length.

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“…Recently, researchers have been interested in producing and developing ultra‐high‐performance concrete (UHPC) properties and their applications, 1–3 in addition to studying the possibility of using nanomaterials (NMs) of industrial waste to improve concrete properties and reduce production costs 4–8 . The main distinguishing features are the superior UHPC's mechanical strength, which is not less than 150 MPa; the tensile strength, which is greater than 8 MPa at 28 days test age of; and its ultra‐durability 9,10 .…”

Section: Introductionmentioning

confidence: 99%

Effect of modified nano‐titanium and fly ash on ultra‐high‐performance concrete properties

Ghanim

Amin

Zeyad

et al. 2023

Structural Concrete

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This paper aims to study the effect of using modified nano‐TiO2 with fly ash (FA) on ultra‐high performance concrete's (UHPC) mechanical, transport, and microstructure properties (UHPC). A ball mill was used to disband the nano‐TiO2 and distribute it uniformly within the FA powder. In this research, 20% of the cement weight was replaced by FA, and nano‐TiO2 was added by 0.4%, 0.8%, 1.2%, 1.6%, and 2% of the FA weight. To investigate the effect of the ball mill period on the UHPC properties, periods of 10, 20, 30, and 40 min were applied to a binder of 20% FA and with 6% nano‐TiO2. In addition, a 30‐min ball mill period on a binder of 20% FA and 0.4%, 0.8%, 1.2%, 1.6%, and 2% nano‐TiO2 was also investigated. Tests of compressive strength after 1, 7, 28, and 91 days of curing in tap water, splitting tensile strength, flexural strength, and modulus of elasticity were performed after 28 days of curing in tap water. Tests of chloride permeability, sorptivity coefficient, water permeability, and microstructure were also performed after 28 days of curing in tap water. The results showed that the addition of higher percentages of nano‐TiO2 led to a decrease in workability. The addition of nano‐TiO2 improved the mechanical properties. The highest compressive strength of 208.9 MPa was achieved for the mixture of 20% FA with 1.2% nano‐TiO2 at the age of 28 days. The 30‐min period of application of the ball mill achieved the best performance compared with the other periods. The results of using a ball‐mill to re‐mix nano‐TiO2 between 1.2% and 2% by weight with FA showed impressive comparative results.

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Influence of blended powders on properties of Ultra-High Strength Fibre Reinforced Self Compacting Concrete subjected to elevated temperatures

Cited by 18 publications

References 88 publications

An Elucidative Review of the Nanomaterial Effect on the Durability and Calcium-Silicate-Hydrate (C-S-H) Gel Development of Concrete

An Elucidative Review of the Nanomaterial Effect on the Durability and Calcium-Silicate-Hydrate (C-S-H) Gel Development of Concrete

Effect of Steel Fibers on the Interfacial Shear Strength of Flyash and GGBS based Geopolymer concrete activated with water glass

Effect of modified nano‐titanium and fly ash on ultra‐high‐performance concrete properties

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