Optimization of Arabian‐Shield‐Based Natural Pozzolan and Silica Fume for High‐Performance Concrete Using Statistical Design of Experiments

Abbas, Yassir M.; Khan, M. Iqbal

doi:10.1155/2021/5512666

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…SRs are widely spread in the Arabian Peninsula and have been used as lightweight fine and coarse aggregates [2,3]. The potential of the utilization of the ground SR in concrete as natural Pozzolan has been investigated by many researchers [4][5][6][7][8]. Since ancient Greek and Roman times, natural pozzolanic materials have been utilized as building materials.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the quantity of reactive phase in the pozzolanic material participating in the pozzolanic reaction should be evaluated. The accurate amount of pozzolanic material to be added to consume the calcium hydroxide (CH) liberated during the hydration of Portland cement (PC) can be established by estimating the ratio of reactive and inert silicates in pozzolanic materials [7]. Diatomite, trass, bentonite, and zeolite were used as natural pozzolanic materials with varying pozzolanic reactivity due to their variable amorphous-phase content and specific surface area [9].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Pozzolanic Activity of Ground Scoria Rocks under Low- and High-Pressure (Autoclave) Steam Curing

Fares

Alhozaimy

2022

Materials

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Two sources of natural scoria rocks were procured and ground for use in concrete as natural pozzolans (NP1 and NP2). The evaluation of their pozzolanic reactivity is carried out using different techniques and approaches. The primary goal of employing these techniques is to monitor the amount of portlandite (CH=Ca(OH)2) consumed during steam curing at low or high pressure. The pozzolanicity of NP powders is determined either directly by monitoring CH variation or indirectly by compressive strength and microstructure development. Autoclave curing is known to stimulate the pozzolanicity of the inert siliceous and aluminosiliceous materials under its high-pressure steam conditions. Both steam-curing conditions were applied in this investigation. In this study, X-ray diffraction, scanning electron microscope, thermogravimetric, Fourier transform infrared, and isothermal analyzers were used. It is concluded that the nature and types of minerals in SR determine their pozzolanic reactivity as either low-pressure steam-reactive or high-pressure steam-reactive cementitious materials. Due to the nature of their silicate structures, notably single-chain or 3D-framework structures, plagioclase feldspars (albite-anorthite) minerals are high-pressure steam-reactive minerals, whereas pyroxene (enstatite and diopside) minerals are low-pressure steam-reactive minerals. Using high-pressure steam curing, varied replacement levels of up to 60% were achieved in NP1, with a consistent strength activity index (SAI) of 99%, while an SAI of 79% was obtained with NP2. During low-pressure steam curing, NP1 and NP2 consumed around 72 and 80% of portlandite, respectively, demonstrating their relative pozzolanic reactivity. When compared to the control concrete mix, the strength activity indices of NP1, NP2, and class F fly ash in their normal concrete mixes reached 74.3, 82, and 73.7%, respectively, after 56 days of normal curing conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of Pozzolanic Activity of Ground Scoria Rocks under Low- and High-Pressure (Autoclave) Steam Curing

Fares

Alhozaimy

2022

Materials

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“…For that reason, the effective combination of FA and SF as a partial replacement for cement and an enhancer for strength and durability becomes a common practice [27][28][29][30][31][32][33][34][35]. The ternary combination of SF (10%) with FA increases its compressive strength compared to the reference binary with FA by about 145% [30].…”

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confidence: 99%

Enhancing Cementitious Concrete Durability and Mechanical Properties through Silica Fume and Micro-Quartz

Khan,

Abbas,

Fares

2023

Sustainability

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The existing body of literature has witnessed extensive research efforts dedicated to exploring the impact of supplementary cementitious materials (SCMs) possessing pozzolanic characteristics on concrete. Nevertheless, the holistic concept of micro-scale fillers has frequently been a subject that remains insufficiently explored. This study endeavors to formulate binary cementitious systems that incorporate silica fume (SF) and micro-quartz filler (MQF) to enhance the durability and mechanical properties of cementitious concrete. We systematically investigate the effects of varying replacement levels of SF and MQF, alongside changes in the water-to-binder (w/b) ratio. With w/b ratios spanning 0.25 to 0.40, we explored replacement levels of 8, 10, and 12% (wt.) for SF, and 5, 8, 10, 15, 25, and 35% (wt.) for MQF. The findings revealed a consistent decrease in porosity and permeability as the replacement levels increase. Notably, a marked increase in compressive strength is observed with SF replacement, reaching its peak at an 8% MQF replacement level. Even as MQF replaces 15% of SF, concrete mixtures with 12% SF consistently exhibit superior strength. Importantly, MQF’s ultrafine particle size mirrors SF’s impact on enhancing compressive strength, porosity reduction, and permeability, despite its high crystalline structure. The study employs an analysis of variance (ANOVA) to rigorously assess the influence of each variable on the studied responses.

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Exploring the Potential of Silica Fume and Micro-Quartz for Enhancing the Strength, Durability, and Sustainability of Cementitious Concrete

Khan,

Abbas,

Fares

2023

Preprint

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This study aims to formulate binary cementitious systems containing silica fume (SF) and micro quartz (MQ) to improve cementitious concrete's durability and mechanical properties. In this investigation, we examined the effects of different essential variables, such as the level of SF and MQ replacement and the ratio of the water-binder (w/b). In this study, the w/b ratios were 0.25, 0.3, 0.35, and 0.4. Replacement levels for SF were 8, 10, and 12%, while replacement levels for MQ were 5, 8, 10, 15, 25, and 35%. The porosity and permeability decreased with an increase in replacement levels, regardless of the type of fine material used or the amount of replacement. Meanwhile, the strength increased markedly with SF replacement, reaching its maximum MQ of 25% at the SF level. The strength of the SF mixing was the highest in all mixes, and it remained the highest until 15% of MQ was replaced. The ultrafine size of MQ particles contributes to the improvement of compressive strength, porosity, and permeability in a similar way to SF particles, despite their high crystalline structure. Furthermore, in this study, analysis of variance (ANOVA) was employed to verify the influence of each variable on the studied response.

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Optimization of Arabian‐Shield‐Based Natural Pozzolan and Silica Fume for High‐Performance Concrete Using Statistical Design of Experiments

Cited by 4 publications

References 39 publications

Assessment of Pozzolanic Activity of Ground Scoria Rocks under Low- and High-Pressure (Autoclave) Steam Curing

Assessment of Pozzolanic Activity of Ground Scoria Rocks under Low- and High-Pressure (Autoclave) Steam Curing

Enhancing Cementitious Concrete Durability and Mechanical Properties through Silica Fume and Micro-Quartz

Exploring the Potential of Silica Fume and Micro-Quartz for Enhancing the Strength, Durability, and Sustainability of Cementitious Concrete

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