Durability and micro-structure studies on fly ash and silica fume based composite fiber reinforced high-performance concrete

Patil, Sachin; Somasekharaiah, H. M.; Rao, H. Surya Prakash; Ghorpade, Vaishali G.

doi:10.1016/j.matpr.2021.07.247

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Many recent studies have focused on the effect of mineral additions on the Chimical resistance of (HPC) [12][13][14]. It should be noted that there are few studies in the literature that deal with the effect of Algerian ground (NP) and limestone ller (LF) additions on the Chimical resistance of (HPC).…”

Section: Introductionmentioning

confidence: 99%

Effect of mineral additions on the chemical resistance of high-performance concrete

HADJI,

ATTIA,

DOUARA

et al. 2024

Preprint

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The aim of this paper is to assess the effect of the natural pozzolan (NP) and limestone filler (LF) on the Chimical resistance of high-performance concrete (HPC) in an aggressive environment. (NP) and (LF) were used to replace different proportions of cement (PC). HPCC(100%PC), HPC18(10%LF + 90%PC), HPC7(20%NP + 80%PC), and HPC14(5%LF + 10%NP + 85%PC) were mixed, cast, and cured in pure water for 28 days. The sorptivity coefficients S (cm*s-0.5) of these HPCs were then estimated, and the mass change measuring specimens were immersed in three different mediums: pure water, (5%HCl) acid, and (5%H2SO4) acid. Their masses' changes were measured after 30, 90, and 180 days of conservation. The substitution of (PC) by (LF) and (NP) decreased the sorptivity of (HPC) depending on the type and proportion of the mineral addition. In a medium (5%H2SO4), HPC18 and HPC14 exhibited good chemical resistance compared to that of HPC7. In a medium (5%HCl), the mass loss in HPC7 and HPC14 are less than those in HPC18. The mass losses were in the range 3.32-9.63% and 11.22-13.31% in (5%HCl) acid and (5%H2SO4) acid respectively. Which proves that the chimical attac by sulfuric acid is more agressif than that by hydrochloric acide. When a mass of (PC) was replaced by (10%LF), (20%NP) or (5%LF + 10%NP) the sorptivity decreased. The substitution of 10% of the (PC) mass by (LF) increased the HPC resistance against H2SO4 acid chemical attack. However, The substitution of (PC) by (NP) and (LF) reduced the HPC's resistance to hydrochloric acid's chemical attack.

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Section: Introductionmentioning

confidence: 99%

Effect of mineral additions on the chemical resistance of high-performance concrete

HADJI,

ATTIA,

DOUARA

et al. 2024

Preprint

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“…Regarding the effects of nanosilica and microsilica alone and in combination, researchers have shown that the combination of these two additives to the optimal amount in concrete samples increases the compressive strength of the samples in the short and long term. The increase in compressive strength in this case leads to a further decrease in permeability compared to other samples [20]. With the presence of 5; 10; 15; 20; and 30 % microclay compared to the volume of cement used in concrete, the optimal percentage of this additive is determined as 15 % [21].…”

Section: Introductionmentioning

confidence: 99%

Effects of Kortta fibres and microsilica on the mechanical properties of lightweight concrete in oil product environments

Jafari¹,

Rezaei²

2023

ACAE

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Crude oil and its products are strategic and vital goods for most countries in the world. It is necessary to store these products in the production and transfer chain and send them to refineries, ports, and airports for military and national purposes. Lightweight concrete is propounded as a useful replacement for normal concrete due to its low specific weight and acceptable resistance property; however, compared to normal concrete, it is considered to be more permeable, less durable, and less resistant. Therefore, in this study, the reliability of this synthetic material in oil conditions has been investigated. In this regard, two groups of samples were investigated under normal and oil environmental conditions, polymer Kortta fibres with percentages of 0; 0,5; 1,0; 1,5; and 2,0 % and microsilica with percentages of 0 and 15 % by cement weight were incorporated alone and combined. Subsequently, tests were performed on the specimens after 90 days. The results showed that the combination of microsilica and Kortta fibres causes a significant increase in lightweight concrete strength and impermeability.

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“…The strengthened members are frequently located in harmful media and severe environments in the service life stage, causing early degradation and performance deterioration [31]. The durability issue under environmental conditions considering monolithic samples has been observed via experimental investigation in many previous studies [32][33][34][35][36][37]. In the technical literature, few studies have also been found that observed the durability issue on composite (repaired) samples under a freeze-thaw cycle [38][39][40], elevated temperature [41][42][43][44][45], etc.…”

Section: Introductionmentioning

confidence: 99%

Durability Enhancement Effect of Silica Fume on the Bond Behavior of Concrete–PCM Composites under Environmental Conditions

Mizan

Matsumoto

2023

Polymers

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The long-term performance of the concrete–polymer cement mortar (PCM) interface under environmental exposure is crucial to the safety of the PCM overlaying method as the environmental exposure of the repaired structures caused further degradation of the interface, leading to a significant reduction in intended service life. This study investigates the durability enhancement effect of silica fume of the concrete–PCM interface, considering an individual action of elevated temperature (e.g., 60 °C) [constant (short and moderate duration) and cyclic conditions] and moisture content [continuous immersion and wetting/drying (W/D) cycle]. Our previous research confirmed that the use of silica fume forms more C-S-H with strong binding force and enhances the interfacial bonding strength due to the denser microstructure at the interface, and it is expected to be utilized for durability purposes under the aforementioned exposure conditions. Under all elevated temperature exposure conditions, the reduction percentage of the interfacial performance corresponding to the respective reference specimens reduced significantly with the inclusion of silica fume with overlay material. The occurrence of interface fracture at lower load and a greater number of pure interface fracture modes observed in normal PCM specimens compared to modified PCM specimens indicates a positive influence of higher adhesion with better durability of modified PCM overlay with substrate concrete. Under both conditions of moisture content, significant reduction in interfacial strength was observed in normal PCM specimens. In all cases, the reducing ratio of interfacial strength was higher in normal PCM compared to modified PCM, indicating a positive influence of silica fume under moisture content. Furthermore, silica fume inclusion shifts the fracture mode from pure interfacial fracture to composite fracture mode, indicating a positive response of silica fume to improve the resistance of interface fracture under moisture content. Conclusively, the use of silica fume improves concrete–overlay layer adhesion and enhances the bonding durability under environmental exposure.

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Durability and micro-structure studies on fly ash and silica fume based composite fiber reinforced high-performance concrete

Cited by 7 publications

References 8 publications

Effect of mineral additions on the chemical resistance of high-performance concrete

Effect of mineral additions on the chemical resistance of high-performance concrete

Effects of Kortta fibres and microsilica on the mechanical properties of lightweight concrete in oil product environments

Durability Enhancement Effect of Silica Fume on the Bond Behavior of Concrete–PCM Composites under Environmental Conditions

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