Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

Elrahman, Mohamed Abd; Chung, Sang-Yeop; Sikora, Paweł; Rucińska, Teresa; Stephan, Dietmar

doi:10.3390/ma12193078

Cited by 69 publications

(55 citation statements)

References 45 publications

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“…The use of seawater exhibited a noticeable effect on decreasing the water absorption coefficient of mortars containing both types of cements. In addition, the presence of NS in the mixture lead to a further decrement in this parameter, which is in line with the work of other researchers (Du and Pang 2015;Abd Elrahman et al 2019;Tsampali et al 2019). In both .…”

Section: Water Accessible Porosity and Water Sorptivitysupporting

confidence: 91%

“…In the case of pozzolan-blended cement, this effect can only be observed in the early days of hydration. Additionally, the presence of NS has a significant effect on accelerating the early development of the flexural strength of mortars, but, after 28 days of curing the effect is rather limited, within a range of 10% (Skoczylas and Rucińska 2018b;Abd Elrahman et al 2019).…”

Section: Flexural Strengthmentioning

confidence: 99%

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The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

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This study investigates the effects of seawater and nanosilica (3% by weight of cement), on the fresh and hardened properties of cement pastes and mortars produced with two types of low heat cements: Portland pozzolana cement (CEM II) and blast furnace cement (CEM III). The heat of hydration, initial and final setting times, rheological properties, strength development, sorptivity and water accessible porosity of the cement pastes and mortars were determined. The data reveal that cement type has a significant effect on the reaction rate of cement with seawater and nanosilica (NS). Specimens produced with slag-blended cement exhibited a higher cement reaction rate and the composite produced exhibited better mechanical performance, as a result of the additional reaction of alumina rich phases in slag, with seawater. Replacement of freshwater with seawater contributes mostly to a significant improvement of early strength. However, in the case of slag-blended cement, 28 day strength also improved. The incorporation of NS results in additional acceleration of hydration processes, as well as to a decrease in cement setting time. In contrast, the addition of NS results in a noticeable increment in the yield-stress of pastes, with this effect being pronounced when NS is mixed along with seawater. Moreover, the use of seawater and NS has a beneficial effect on microstructure refinement, thus improving the transport properties of cement mortars. Overall, the study has showed that both seawater and NS can be successfully used to accelerate the hydration process of low heat blended cements and to improve the mechanical and transport properties of cement-based composites.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Section: Water Accessible Porosity and Water Sorptivitysupporting

confidence: 91%

Section: Flexural Strengthmentioning

confidence: 99%

The effects of seawater and nanosilica on the performance of blended cements and composites

Sikora

Lootens²,

Liard³

et al. 2020

Appl Nanosci

Self Cite

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“…One of the key factors for optimizing energy efficiency is thermal conductivity. When a building is constructed from materials with high thermal conductivity, a great amount of energy is consumed for cooling and heating [4,5]. To ensure the internal temperature of structures, materials with low thermal conductivity are recommended for constructing concrete structures.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Yang

Park

2020

Materials

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The thermal conductivity of concrete is a key factor for efficient energy consumption in concrete buildings because thermal conductivity plays a significant role in heat transfer through concrete walls. This study investigated the effects of replacing fine aggregates with coal bottom ash (CBA) and the influence of curing age on the thermal properties of high-strength concrete with a compressive strength exceeding 60 MPa. The different CBA aggregate contents included 25%, 50%, 75%, and 100%, and different curing ages included 28 and 56 days. For concrete containing CBA fine aggregate, the thermal and mechanical properties, including the unit weight, thermal conductivity, compressive strength, and ultrasonic velocity, were measured. The experimental results reveal that the unit weight and thermal conductivity of the CBA concrete were highly dependent on the CBA content. The unit weight, thermal conductivity, and compressive strength of the concrete decreased as the CBA content increased. Relationships between the thermal conductivity and the unit weight, thermal conductivity and compressive strength of the CBA concrete were proposed in the form of exponential functions. The equations proposed in this study provided predictions that were in good agreement with the test results. In addition, the test results show that there was an approximately linear relationship between the thermal conductivity and ultrasonic velocity of the CBA concrete.

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“…Numerous studies around the world have been dedicated to research in the field of lightweight aggregate concrete. Consequently, various concrete mixtures with different mechanical properties have been proposed [5][6][7][8][9][10]. However, in most cases, traditional studies usually address the optimization of concrete properties with respect to one or more aspects, such as microstructure, mechanical resistance, and durability [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Deformation Analysis of Reinforced Beams Made of Lightweight Aggregate Concrete

Bačinskas

Rumsys²,

Соколов

et al. 2019

Materials

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In the present trend of constructing taller and longer structures, the application of lightweight aggregate concrete is becoming an increasingly important advanced solution in the modern construction industry. In engineering practice, the analysis of lightweight concrete elements is performed using the same algorithms that are applied for normal concrete elements. As an alternative to traditional engineering methods, nonlinear numerical algorithms based on constitutive material models may be used. The paper presents a comparative analysis of curvature calculations for flexural lightweight concrete elements, incorporating analytical code methods EN 1992-1 and ACI 318-19, as well as a numerical analysis using the constitutive model of cracked tensile lightweight concrete recently proposed by the authors. To evaluate the adequacy of the theoretical predictions, experimental data of 51 lightweight concrete beams of five different programs reported in the literature were collected. A comparison of theoretical and experimental results showed that the most accurate predictions are obtained using numerical analysis and the constitutive model proposed by the authors. In the future, the latter algorithm can be used as a reliable tool for improving the design standard methods or numerical modeling of lightweight concrete elements subjected to short-term loading.

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Influence of Nanosilica on Mechanical Properties, Sorptivity, and Microstructure of Lightweight Concrete

Cited by 69 publications

References 45 publications

The effects of seawater and nanosilica on the performance of blended cements and composites

The effects of seawater and nanosilica on the performance of blended cements and composites

A Study on the Thermal Properties of High-Strength Concrete Containing CBA Fine Aggregates

Deformation Analysis of Reinforced Beams Made of Lightweight Aggregate Concrete

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