Carbonation curing of industrial solid waste‐based aerated concretes

Ruonan Guo, Qiyang Chen, Hao Huang, Xutao Hu and Tao Wang

Greenhouse Gases: Science and Technology, 2019, vol. 9, issue 2, 433-443

Abstract: Mineral carbonation for concrete curing is a promising route to large‐scale CO2 sequestration and the economic production of building materials. In this work, the carbonation curing of a kind of lightweight concrete, aerated concrete, was comprehensively studied. Three typical industrial wastes – fly ash, blast furnace slag, and red mud – were employed to replace part of the cement and to reduce the carbon footprint of products. The effects of carbonation curing time, pressure, and water‐to‐solids ratio on the CO2 uptake and compressive strength were investigated. Aerated concrete with red mud showed the highest CO2 uptake capacity, followed by concrete with fly ash, and concrete with blast furnace slag. The main crystalline carbonation products, needle‐like calcite and rod‐like aragonite, were observed to be embedded in the surface of fly ash and blast‐furnace‐slag‐based specimens. The orderly structures of carbonated crystals, as well as the reduction of mesoscale porosity (

Date: 2019
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https://doi.org/10.1002/ghg.1862

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Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:9:y:2019:i:2:p:433-443

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