Sustainable Blended Cements—Influences of Packing Density on Cement Paste Chemical Efficiency

Knop, Yaniv; Peled, Alva

doi:10.3390/ma11040625

Cited by 13 publications

(4 citation statements)

References 24 publications

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“…This confirms that CWP demonstrates pozzolanic activity. These results are is in agreement with previous studies (Ramachandran and Beaudoin, 2000;MehtaMonteiro); indicating that a second hydration reaction results from the CWP (Schuldyakov et al, 2016;Knop and Peled, 2018). This indicated that the exchange of calcium Hydroxide to C-S-H was promoted due to the high Si provided by CWP.…”

Section: Frattini Testsupporting

confidence: 93%

Eco-friendly concrete using by-products as partial replacement of cement

El-Nadoury

2022

Front. Mater.

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The current challenge facing the construction industry is to produce sustainable concrete at the lowest feasible cost. One obstacle to that is the demand for an excessive amount of cement. The reduction of cement content can be achieved by its partial replacement with by-product materials that attain an appropriate pozzolanic index. Two by-products namely; Ceramic waste powder (CWP) and rice husk ash (RHA) are remarkably formed throughout tiles and rice production. Using these by-products as a partial substitution for cement reduces landfills, the cost of concrete, and climate change due to cement production. This paper investigates the effect of replacing 5%, 15%, 20%, 25%, and 30% of cement with CWP. Varied proportions of RHA; 5%, 10%, 15%, and 25% were added to the mix with the optimum CWP. The concrete mixture was proportioned to produce M35-grade concrete. Properties of concrete were assessed concerning workability, compressive, splitting tensile, and flexural strength. The results are compared to conventional concrete with 0% replacement. Results identified that 20% substitution of cement by CWP is the optimum percentage. It increases the compressive, splitting tensile, and flexural strength by 11%, 20%, and 12.5% respectively. Increasing the percentage up to 30% has minor effect on tensile and flexural strength but has destructive effect on compressive strength. Blending cement with CWP and RHA additionally improves the mechanical properties. The combination of 20% CWP/10% RHA propose superior strength, it increases the compressive, tensile, and flexural strength by 14%, 28%, and 19% compared to the control concrete.

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Section: Frattini Testsupporting

confidence: 93%

Eco-friendly concrete using by-products as partial replacement of cement

El-Nadoury

2022

Front. Mater.

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“…From Table , it is clearly seen that at a lower temperature, the sample contains higher amounts of calcite and anhydrite. The fine calcite powder in the sample can act as nucleation centers and, therefore, increase the rate of the hydration reaction of the cement with water, as was described by Knop et al In addition, the increased amount of anhydrite can also be a reason for the increased compressive strength because of the faster hydration of the anhydrite with water. After 4 h of thermal treatment at 500 °C, the amount of both anhydrite and calcite were at the highest level and, thus, the maximum compressive strength was obtained accordingly.…”

Section: Resultsmentioning

confidence: 87%

Treated Oil Shale Ashes as Cement and Fine Aggregates Substitutes for the Concrete Industry

Nov,

Barak,

Cohen

et al. 2023

ACS Omega

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The increased global demand for energy and the environmental concerns associated with fossil fuels highlight the need for alternative approaches. Fossil fuel combustion, particularly coal and oil shale, contributes to greenhouse gas emissions and generates large amounts of ash residues, posing environmental challenges. This study focuses on the potential of thermal treatment to upgrade oil shale bottom ash (OSBA) for use as a cement replacement in concrete, addressing both the economic viability of oil shale combustion and the environmental issue of ash waste management. The findings have significant implications for improving the economics and environmental sustainability of oil shale combustion in construction. By enhancing the properties of OSBA, this study contributes to the advancement of greener energy solutions and waste management practices in the energy and construction sectors.

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“…Although SCM use for increasing particle density often relies on materials finer than cement, the particle size distribution of the SCMs used shows that all of them were coarser than cement. According to the literature, however, coarser SCMs may still contribute to cement hydration through the filler effect [ 13 , 22 , 42 ]. HCFA is the coarsest material, considering both median particle size diameter d50 and specific surface area.…”

Section: Resultsmentioning

confidence: 99%

Effect of High Calcium Fly Ash, Ladle Furnace Slag, and Limestone Filler on Packing Density, Consistency, and Strength of Cement Pastes

Anastasiou¹

2021

Materials

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Environmental considerations and technical benefits have directed research towards reducing cement clinker content in concrete, and one of the best ways to do this is to replace cement with supplementary cementitious materials. High calcium fly ash, ladle furnace slag, and limestone filler were investigated as supplementary cementitious materials in cement pastes, and binary mixtures were produced at 10%, 20%, and 30% cement replacement rates for each material. The water requirement for maximum packing and for normal consistency were obtained for each paste, and strength development was determined at 3, 7, 28, and 90 days for the 20% replacement rate. Furthermore, two ternary mixtures at 30% cement replacement were also prepared for maximum packing density and tested for compressive strength development. The results showed that high calcium fly ash decreased cement paste packing and increased water demand but contributed to strength development through reactivity. Ladle furnace slag and limestone filler, on the other hand, were less reactive and seemed to contribute to strength development through the filler effect. The ternary paste with 70% cement, 20% high calcium fly ash, and 10% limestone filler showed equivalent strength development to that of the reference cement paste.

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Sustainable Blended Cements—Influences of Packing Density on Cement Paste Chemical Efficiency

Cited by 13 publications

References 24 publications

Eco-friendly concrete using by-products as partial replacement of cement

Eco-friendly concrete using by-products as partial replacement of cement

Treated Oil Shale Ashes as Cement and Fine Aggregates Substitutes for the Concrete Industry

Effect of High Calcium Fly Ash, Ladle Furnace Slag, and Limestone Filler on Packing Density, Consistency, and Strength of Cement Pastes

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