Study of low-cement concrete mix-design through particle packing techniques

Londero, Carolina; Klein, Nayara Soares; Mazer, Wellington

doi:10.1016/j.jobe.2021.103071

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…Liu [26] researched the validity of Dewar's particle packing theory for recycled concrete aggregate and suggested that while the amount of powder has a limited influence on the packing density, the fine particles in the aggregate could have an important influence on the void ratio in the concrete mix. Londero [27] investigated a low-cement concrete mix by examining cyclic interactions and found that it was possible to reduce 40% of the cement consumption by applying particle packing techniques, leading to 28-day compressive and tensile strengths of 31 MPa and 2.9 MPa, respectively. With the help of the hot-pressing method and by optimizing insulating particle packing, Wei et al [28] showed that the lightweight cementitious composites from glass, fly ash, cement, and silica fume have excellent mechanical properties and outstanding thermal insulation, with reasonable flexural strength, compressive strength, and thermal conductivity.…”

Section: Previous Studiesmentioning

confidence: 99%

Influence of Optimum Particle Packing on the Macro and Micro Properties of Sustainable Concrete

Abushama,

Tamimi,

Tabsh

et al. 2023

Sustainability

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In this research, the possibility of making eco-friendly concrete from available materials in the local United Arab Emirates (UAE) market was investigated. Supplementary cementitious materials, such as ground granulated blast-furnace slag (GGBS) and silica fume (SF), were utilized for decreasing the cement quantity, enhancing the particle size distribution and improving packing. In sum, 130 concrete specimens—cubes, cylinders, and prisms—from 10 different concrete mixes were tested to determine the enhancement levels in the fresh and hard properties of new concrete. The results showed the improved particle packing of the concrete, especially within the region of sizes 100–10,000 microns, produced by the Elkem Materials Mix Analyser (EMMA), closely matching the Andreassen theoretical model. The green concrete incorporating SF and GGBS possessed air content in the range 1.0–1.4% and compressive strength that is on average 11% higher than the well-packed concrete that did not contain SF or GGBS. Compared to the ACI 318 code’s predictions, the experimental findings of the optimally packed concrete’s moduli of rupture and elasticity were under-estimated by 55–69% and 0.8–8.8%, respectively. The rapid chloride permeability test (RCPT) showed results as low as 392 coulombs for mixes with supplementary cementitious materials, indicating very low chloride permeability. Microstructural analysis using a scanning electron microscope (SEM) demonstrated that concrete with supplementary materials has fewer voids, more homogeneous integration of ingredients, and an abundance of C-S-H products that supported the RCPT findings and tests of mechanical properties. The study demonstrated a significant decrease in carbon dioxide (CO2) emissions of concrete utilizing GGBS and SF and the financial feasibility of eco-friendly concrete in the UAE.

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Section: Previous Studiesmentioning

confidence: 99%

Influence of Optimum Particle Packing on the Macro and Micro Properties of Sustainable Concrete

Abushama,

Tamimi,

Tabsh

et al. 2023

Sustainability

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“…Many alternatives have been proposed to make the concrete and cement industries more sustainable, such as the use of supplementary cementitious materials (SCM) [9]- [11], recycled concrete [9] and the optimization of the mixing design process [12]. Mehta [6] presents three tools to achieve sustainability in concrete and cement industries: (1) to consume less concrete in new structures, (2) to consume less cement in concrete mixtures and (3) to consume less clinker for making cements, as seen in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Reduction of the environmental impacts of reinforced concrete columns by increasing the compressive strength: a life cycle approach

Alievi

Santoro

Kripka

2022

Rev. IBRACON Estrut. Mater.

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The building industry is one of the greatest environmental impact causers in the planet. Cement is the second most used material in the world and the consumption of concrete ranges between 20 to 30 Gt yearly. This demand for the materials ten ds to increase for the next 100 years. The increase of concrete strength to reduce the material consumption is one of the options proposed in literature to reduce the environmental impacts in building industry. However, few studies have been carried about the actual advantages of this strategy in building production. In this paper, a 15-storey reinforced concrete building was designed with three different concrete grades for its columns: 30 MPa, 40 MPa and 50 MPa. The results for the volume of concrete and the amount of reinforcing steel to produce the columns were used to perform a cradle-to-gate life cycle assessment (LCA) to determine the alternative with less environmental impacts in the production stage. Results indicate an advantage to adopt higher strength concretes in columns to reduce environmental impacts and the consumption of materials. Direct effects of higher strength in concretes made possible to reduce the consumption of concrete by 15%. There was also a significant reduction caused by indirect effects of higher strengths in concrete, with the reducing of steel consumption up to 22%. With the combination of the direct and indirect effects of higher compressive strengths, it was possible to reduce the environmental impacts of reinforced concrete in all categories studied in the LCA.

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“…Among the used packing methods, the Alfred model (modified Andreassen method) is one of the most accepted, being used to define the volume of solid materials and the best packing density of the mixture [9], [10]. Although the concept of packing materials is already used, more studies are needed to analyze the mechanical and durability properties of concrete, highlighting the application of this methodology [11].…”

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confidence: 99%

Concrete mix design method for durability based on particle packing concept

Silva,

Cabral

et al. 2024

Rev. IBRACON Estrut. Mater.

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Concrete presents complex behavior, being a difficult material to define the ideal proportion of its constituents. To overcome this challenge, many mix design methods have been developed over time. However, most of these methods do not consider durability parameters during the procedure. Thus, the objective of this article is to present a mix design method for concrete, with properties of workability (slump rating from 50 mm to 220 mm), axial compressive strength (class of 25MPa to 55MPa), and durability as response parameters. From the application of the proposed method, it was possible to create mix design and performance diagrams. It was noticed that all concretes fell into the pre-established consistency class and presented axial compressive strength results close to the predetermined values. Moreover, it was possible to obtain indications of the material's durability.

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Study of low-cement concrete mix-design through particle packing techniques

Cited by 7 publications

References 17 publications

Influence of Optimum Particle Packing on the Macro and Micro Properties of Sustainable Concrete

Influence of Optimum Particle Packing on the Macro and Micro Properties of Sustainable Concrete

Reduction of the environmental impacts of reinforced concrete columns by increasing the compressive strength: a life cycle approach

Concrete mix design method for durability based on particle packing concept

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