Investigation on surface sulfate attack of nanoparticle-modified fly ash concrete

Vishwakarma, Vinita; Uthaman, Sudha; Ramachandran, D.; Kanagasabai, Viswanathan

doi:10.1007/s11356-020-10134-2

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…Lv et al [12] studied the sulfate corrosion resistance and mechanism of silica fume-reinforced cement mortar. Vishwakarma et al [13] separately incorporated fly ash and nano-TiO 2 into concrete to compare and analyze the sulfate erosion resistance and found that the fly ash concrete had better sulfate erosion resistance.…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Energy Evolution Characteristics and Performance Parameter Degradation of Rubber‐Mixed Concrete in Sulfate Attack Environment

Chen¹

2022

Advances in Civil Engineering

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In order to study the sulfate resistance of rubber concrete (RC), the compressive strength test of RC with different contents (0%, 5%, 10%, and 15%) was carried out, and the proportion of RC with standard curing for 28 days was optimized. Sulfate attack test was carried out on the selected RC and compared with normal concrete (NC). The degradation degree was measured from the effective porosity, relative dynamic elastic modulus, SO42− concentration, and SEM microstructure observation after different attack times. The energy analysis method is used to study the evolution law of total strain energy, elastic strain energy, and dissipated strain energy of NC and RC in the process of deformation and failure after different attack times, and the influence of sulfate attack on concrete is explored from the perspective of energy. The results show that with the progress of sulfate attack, the effective porosity of NC and RC both decreases first and then increases, and the relative dynamic elastic modulus increases first and then decreases. Rubber is beneficial to improve the sulfate resistance of concrete, delay the attack of SO42− on concrete, and improve the ductile deformation of concrete. This study can provide a theoretical reference for the application of RC in practical engineering.

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Section: Introductionmentioning

confidence: 99%

[Retracted] Energy Evolution Characteristics and Performance Parameter Degradation of Rubber‐Mixed Concrete in Sulfate Attack Environment

Chen¹

2022

Advances in Civil Engineering

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“…Some scholars believe that hydration products can react with sulfate attack medium to form insoluble gypsum [ 33 ]. When the attack medium is NaSO 4 and the attack age is short, NaOH as a by-product of the reaction can ensure the continuity of high alkalinity in a concrete system [ 34 ], which plays a vital role in the stability of C–S–H at the interface, and improves the performance of the interface area.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study of the Properties of Recycled Concrete Prepared with Nano-SiO2 and CO2 Cured Recycled Coarse Aggregates Subjected to Aggressive Ions Environment

Gao

Gong

et al. 2021

Materials

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This research focused on the modification effects on recycled concrete (RC) prepared with nano-SiO2 and CO2 cured recycled coarse aggregates (RCA) subjected to an aggressive ions environment. For this purpose, RCA was first simply crushed and modified by nano-SiO2 and CO2, respectively, and the compressive strength, ions permeability as well as the macro properties and features of the interface transition zone (ITZ) of RC were investigated after soaking in 3.5% NaCl solution and 5% Na2SO4 solution for 30 days, respectively. The results show that nano-SiO2 modified RC displays higher compressive strength and ions penetration resistance than that treated by carbonation. Besides, we find that ions attack has a significant influence on the microcracks width and micro-hardness of the ITZ between old aggregate and old mortar. The surface topography, elemental distribution and micro-hardness demonstrate that nano-SiO2 curing can significantly decrease the microcracks width as well as Cl− and SO42− penetration in ITZ, thus increasing the micro-hardness, compared with CO2 treatment.

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“…The higher the residual compressive strength of co exposed to sulphate attack, the lower the weight loss. However, a study by Vishwakarma et al [102] reported that when subjec ammonium and sodium sulphate solutions, concrete structures containing nanopa were shown to be less resistant to sulphate attack than fly ash-modified concrete. However, a study by Vishwakarma et al [102] reported that when subjected to ammonium and sodium sulphate solutions, concrete structures containing nanoparticles were shown to be less resistant to sulphate attack than fly ash-modified concrete.…”

Section: Sulphate Resistance Of Concrete Enhanced With Nanomaterialsmentioning

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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Investigation on surface sulfate attack of nanoparticle-modified fly ash concrete

Cited by 15 publications

References 33 publications

[Retracted] Energy Evolution Characteristics and Performance Parameter Degradation of Rubber‐Mixed Concrete in Sulfate Attack Environment

[Retracted] Energy Evolution Characteristics and Performance Parameter Degradation of Rubber‐Mixed Concrete in Sulfate Attack Environment

A Comparative Study of the Properties of Recycled Concrete Prepared with Nano-SiO2 and CO2 Cured Recycled Coarse Aggregates Subjected to Aggressive Ions Environment

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

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