Hydration Process and Mechanical Properties of Cement Paste With Recycled Concrete Powder and Silica Sand Powder

Topič, Jaroslav; Prošek, Zdeněk

doi:10.14311/app.2017.13.0125

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…Oksri-Nelfia [4] further confirms this fact by testing samples where an inert filler replaced the concrete powder. A similar verification was performed in a previous paper [5] when an inert micro-filler replaced the micronized concrete powder in the form of silica powder.…”

Section: Resultssupporting

confidence: 60%

Micronized Concrete Powder as Mircofiller in Cement Paste: Influence on Hydration and Structure

Topič¹,

Prošek²

2021

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The reuse of old concrete as a coarse and fine recycled aggregate in cement composites is relatively well researched, and therefore a very fine fraction of recycled concrete was used in this paper. When using a very fine fraction of recycled concrete, it is appropriate to focus primarily on less technologically demanding treatment processes with minimal costs and environmental impact. Therefore this paper focus on using the fine fraction of recycled concrete as a microfiller. For this purpose, the material is treated by high-speed milling process and micronized concrete powder (MCP) is produced. Using several micronized concrete powder types that differ by origin, separation process and fineness of grinding should help understand how MCP influences the hydration process and cement paste structure. The samples with 0, 10, 20, 30, 40 and 50 wt. % of MCP were made to determine proper dosage in cement paste. Specific surface, matrix density and DTG analysis of micronized concrete powder were carried out. The calorimetric measurement was used to confirm how microfiller affects the hydration process. Finally, bulk density and porosity measurements were performed to determine the effect of MCP and its amount on the cement paste structure.

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Section: Resultssupporting

confidence: 60%

Micronized Concrete Powder as Mircofiller in Cement Paste: Influence on Hydration and Structure

Topič¹,

Prošek²

2021

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“…Moreover, the more the content is added, the more water is adsorbed, which is not conducive to the hydration reaction; secondly, RCP replaces mineral powder. Because the activity of RCP is lower than that of slag, the compressive strength of the AASR foamed concrete decreases [41]. Although the addition of RCP reduces the compressive strength of the AASR foamed concrete, the 28 d compressive strength of AASR foamed concrete under all RCP replacement rates still meets the standard value (0.6 MPa).…”

Section: Compressive Strengthmentioning

confidence: 94%

Experimental Study on the Application of Recycled Concrete Waste Powder in Alkali-Activated Foamed Concrete

Zhang,

Hao,

Yang

2023

Materials

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The alkali-activated cementitious material was prepared by partially replacing slag with recycled concrete powder (RCP). The influence of RCP substitution rates (10%, 20%, 30%, 40%, and 50% mass fraction) on the performance of alkali-activated slag-RCP-based (AASR) foamed concrete was studied. The fluidity, water absorption, softening coefficient, compressive strength, flexural strength, drying shrinkage, thermal conductivity, and frost resistance of AASR foamed concrete were studied. The results show that the fluidity and softening coefficient of AASR foamed concrete decreases with the increase in RCP content, and the fluidity range is 230–270 mm. Due to the porous structure of the RCP, the water absorption of AASR increases. With the increase in the curing age, the strength of AASR foamed concrete increases. The addition of RCP reduced the mechanical properties of AASR foamed concrete. Compared with the control group, the compressive strength of AASR50 decreased by 66.7% at 28 days, and the flexural strength decreased by 61.5%. However, the 28 d compressive strength of AASR foamed concrete under all RCP replacement rates still meets the standard value (0.6 MPa). The addition of RCP effectively reduces the thermal conductivity of the AASR foamed concrete, and when the RCP content is 50%, the thermal conductivity is lowest, 0.119 W/(m·K); the drying shrinkage of the AASR foamed concrete can be improved by adding RCP, and the drying shrinkage value is lowest when the RCP is 30%, which is 14.7% lower than that of the control group. The frost resistance of AASR foamed concrete decreases with the increase in the RCP content. When the recycled micropowder content is 20–50% and after 25 freeze–thaw cycles, AASR foamed concrete has reached freeze–thaw damage.

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“…Also, the decrease in the amount of reactive constituents per volume of material as a result of the addition of sand reduces the heat release, and brings some change in the microstructural development due to nucleation and other effects (Zeghichi et al, 2014;Topič and Prošek, 2017).…”

Section: Effects Of Sand Additionmentioning

confidence: 99%

Early-age characterisation of Portland cement by impedance spectroscopy

Gallardo

Provis

2022

Advances in Cement Research

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This paper applies alternating current impedance spectroscopy to assess the effect of different sand, anhydrite, and water contents on the electrochemical response of Portland cement in the early stages of hydration. Potential factors that may affect impedance measurements and data interpretation are also discussed, such as the complexity of cement chemical composition, its physical properties and hydration kinetics, and technique limitations. The impedance data obtained are benchmarked against different supporting techniques and literature data, showing a strong relationship among hydration rates as determined by thermochemistry, setting time measurements by physical approaches, pore fluid chemistry, electrical conductivity, and the impedance behaviour observed. The results demonstrate that ACIS is a sensitive technique to assess cement hydration, enabling differentiation of changes in the water and cement content, hydration degree, and microstructural development during the first 24 hours after mixing.

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Hydration Process and Mechanical Properties of Cement Paste With Recycled Concrete Powder and Silica Sand Powder

Cited by 8 publications

References 12 publications

Micronized Concrete Powder as Mircofiller in Cement Paste: Influence on Hydration and Structure

Micronized Concrete Powder as Mircofiller in Cement Paste: Influence on Hydration and Structure

Experimental Study on the Application of Recycled Concrete Waste Powder in Alkali-Activated Foamed Concrete

Early-age characterisation of Portland cement by impedance spectroscopy

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