Experimental Evaluation of Nano Silica Effects to High Performance Concrete Strength in Early Age

Ngo, Van-Thuc; Bui, TienThanh; Lam, Thanh Quang Khai; Nguyen, Thi-Thu-Nga; Nguyen, Van-Hau

doi:10.1088/1757-899x/869/3/032011

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…For instance, the flexural and compressive strengths of concrete grow considerably with the NS ratio from 0 to 1.5%, reaching 19.19% and 20.97%, respectively. Certain studies [50][51][52][53][54][55] also confirmed the tendency of this increase in strength. A previous study reported by Naji Givi et al [51] found that concrete with an NS component of 1.0 ÷ 1.5% has a higher bending strength than control concrete.…”

Section: Compressive Strength and Flexural Strengths At Early Curing Agementioning

confidence: 64%

Mechanical Properties of High Strength Concrete Containing Nano SiO2 Made from Rice Husk Ash in Southern Vietnam

Tran

Phan

2021

Crystals

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This paper presents the experimental results of the production of Nano-SiO2 (NS) from rice husk ash (RHA) and the engineering properties of High Strength Concrete (HSC) containing various NS contents. Firstly, the mesoporous silica nanoparticles were effectively modulated from RHA using NaOH solution, and subsequently precipitated with HCl solution until the pH value reached 3. The optimum synthesis for the manufacture of SiO2 nanoparticles in the weight ratio of RHA/NaOH was 1:2.4, and the product was calcined at 550 °C for 2 h. The EDX, XRD, SEM, TEM, FT-IR, and BET techniques were used to characterize the NS products. Results revealed that the characteristics of the obtained NS were satisfactory for civil engineering materials. Secondly, the HSC was manufactured with the aforementioned NS contents. NS particles were added to HSC at various replacements of 0, 0.5, 1.0, 1.5, 2.0, and 2.5% by the mass of the binder. The water-to-binder ratio was remained at 0.3 for all mixes. The specimens were cured for 3, 7, 28, 25 days under 25 ± 2 °C and a relative humidity of 95% before testing compressive and flexural strengths. Chloride ion permeability was investigated at 28 and 56 days. Results indicated that the addition of NS dramatically enhanced compressive strength, flexural strength, chloride ion resistance, and reduced chloride ion permeability compared to control concrete. The optimal NS content was found at 1.5%, which yielded the highest strength and lowest chloride ion permeability. Next, the development of flexural and compressive strengths with an age curing of 3–28 days can be analytically described by a logarithmic equation with R2 ≥ 0.74. The ACI code was used, and the compressive strength at t-day was determined based on 28 days with R2 ≥ 0.95. The study is expected to solve the redundancy of waste RHA in southern Vietnam by making RHA a helpful additive when producing high-strength concrete and contributing meaningfully to a sustainable environment.

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Section: Compressive Strength and Flexural Strengths At Early Curing Agementioning

confidence: 64%

Mechanical Properties of High Strength Concrete Containing Nano SiO2 Made from Rice Husk Ash in Southern Vietnam

Tran

Phan

2021

Crystals

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“…Steel fber concrete is used quite commonly because they have increased load capacity, reduced the number of cracks, increased construction life, and have good impact resistance. A few studies on nanoconcrete with steel fbers (SFs) looked into the efects of concrete aggregation on increasing concrete tensile strength [1], the enhanced plasticity of concrete with SFs [2], and an observation design was also carried out to consider nanosilica efects on HPC strength at an early age [3], the fracture features of SFs' reinforced concrete beams [4]. A number of scholars have started referring to a series of studies on the RC beams with and without SFs; these studies have constructed a stress strain of the reinforced concrete (RC) beams with SF contents in concrete of 0%, 4%, and 8% by volume.…”

Section: Introductionmentioning

confidence: 99%

The Behavior of RC Beams Strengthened with Steel Fiber Concrete Layer by ANSYS Simulation

Lam¹,

Dung²

2023

Advances in Civil Engineering

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In this study, a double-layer reinforced concrete beam structure was created for the purpose of repairing reinforced concrete beams by pouring a layer of concrete on top of the reinforced concrete beam and then adding fibers to the concrete. Take into consideration the bearing capacity of these double-layer concrete beams as well as the effects that the input parameters have on the stress strain, the propagation of cracks in reinforced concrete beams. The study looks at double-layered reinforced concrete beams, with the steel fiber concrete placed on top of the one containing the normal concrete. This investigation led to the following relationships: load-compressive stress, tensile stress, and vertical displacement at the midpoint of the beam span, as well as a diagram showing how cracks spread in the beams. After getting the experimental results and comparing them with an ANSYS simulation, the diagram was used to figure out the loads at which the beams start to look cracked and the loads at which the beams are damaged. This study investigated the following six cases: how the addition of SFs affects the properties of concrete, the spacing of the stirrups at the ends of the beam should be looked into to see what effects it might have, how the number of tensile steel bars in the beam affects its properties, how the diameter of tensile steel bars affects their properties, how the diameter of compressed steel bars affects the results, and how the thickness of the SFC layer affects the properties of the material. Also, the things that were mentioned would have a big effect on how these double-layer beams in the design work.

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Two-Layered Steel Fiber Concrete Beam with Concrete Grade Change in Layers

Dung¹,

Lam²,

Ngo³

et al. 2021

Resilient Infrastructure

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Experimental Evaluation of Nano Silica Effects to High Performance Concrete Strength in Early Age

Cited by 11 publications

References 17 publications

Mechanical Properties of High Strength Concrete Containing Nano SiO2 Made from Rice Husk Ash in Southern Vietnam

Mechanical Properties of High Strength Concrete Containing Nano SiO2 Made from Rice Husk Ash in Southern Vietnam

The Behavior of RC Beams Strengthened with Steel Fiber Concrete Layer by ANSYS Simulation

Two-Layered Steel Fiber Concrete Beam with Concrete Grade Change in Layers

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