The effect of chemical- versus microbial-induced calcium carbonate mineralization on the enhancement of fine recycled concrete aggregate: A comparative study

Sonmez, Merve; İlcan, Hüseyin; Dundar, Burak; Yıldırım, Gürkan; Erşan, Yusuf Çağatay; Şahmaran, Mustafa

doi:10.1016/j.jobe.2021.103316

Cited by 10 publications

(1 citation statement)

References 63 publications

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“…The underlying mechanism of RFA morphology is associated with the microstructure forming processes during carbonation. During gas-solid carbonation, the calcite and silica gels located inside the RFAs matrix would react with the diffused CO2, contributing to the refined pore structure and drop of porosity [103]. The internal precipitation of RFAs can be described by the shrinking core model (Fig.…”

Section: Morphologymentioning

confidence: 99%

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Zhang

Chen

Wang

et al. 2023

Cement and Concrete Composites

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Section: Morphologymentioning

confidence: 99%

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Zhang

Chen

Wang

et al. 2023

Cement and Concrete Composites

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Microbial Induced Calcium Carbonate Precipitation (MICP) Treatments for the Reduction of Water Absorption of Recycled Mixed Aggregates

Nagy,

Zentner,

Kustermann

2023

RILEM Bookseries

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Preparation of artificial aggregate using waste concrete powder and CO2 fixed by microorganisms

Zhang

Qian

Xie

2022

Clean Techn Environ Policy

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High carbon emissions, shortage of natural aggregates and environmental pollution of waste concrete powder (WCP) have become three imperative crises faced by the traditional concrete industry. The waste concrete crushed to prepare aggregates always has poor mechanical properties and low utilization of waste powder. In this paper, WCP was used to prepare arti cial aggregates by cold-bonding disk granulation. And a novel approach for strengthening mechanical properties and improving CO 2 sequestration of arti cial aggregates was proposed based on using microorganisms. The microorganism enhanced the mechanical properties, porosity and microstructure of arti cial aggregates. The apparent density, crushing strength and water absorption of arti cial aggregates were increased to 2620 kg/m 3 , 9.1 MPa and 4.8 %, respectively. It showed a denser microstructure because more mineralization products with well crystallization reduced the porosity from 20.98 % to 13.88 %. The CO 2 xation of arti cial aggregates increased from 7.39 wt. % to 16.00 wt. % due to the existence of microorganism. The compressive strength of concrete indicated that arti cial aggregate could substitute the nature aggregates partially without affecting its strength, and the better rate should be controlled within 50 wt. %. This method has obvious effect on waste resource utilization and CO 2 emission reduction, displayed good potential for future applications.

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The effect of chemical- versus microbial-induced calcium carbonate mineralization on the enhancement of fine recycled concrete aggregate: A comparative study

Cited by 10 publications

References 63 publications

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Roles of carbonated recycled fines and aggregates in hydration, microstructure and mechanical properties of concrete: A critical review

Microbial Induced Calcium Carbonate Precipitation (MICP) Treatments for the Reduction of Water Absorption of Recycled Mixed Aggregates

Preparation of artificial aggregate using waste concrete powder and CO2 fixed by microorganisms

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