Materials Reports  2019, Vol. 33 Issue (Z2): 300-303 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on Carbon Sequestration Characteristics Enhancing by Carbonation Reactionof CO2 for Foamed Concrete Block with Alkali Leaching |
| REN Guohong1, LIAO Hongqiang1, CHENG Fangqin1, YAN Zhihua2
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1 Institute of Resources and Environment Engineering, Shanxi University, Taiyuan 030006;
2 Changzhi Yangbao, Thermoelectric Fly Ash Comprehensive Utilization Limited, Changzhi 046000 |
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Abstract The foaming concrete and CO2 carbonation reaction can not only improve the concrete performance but also achieve the effect of reducing the mineralization of CO2. The effects of CO2 reaction time on the compressive strength of foamed concrete blocks after immersion in unsoaked, water immersed and calcium carbide slag were investigated. XRD, TGA and SEM were used to analyze the mineral composition of the test blocks. The thermogravimetric properties and micromorphology characteristics were characterized. The results show that the compressive strength of the foamed concrete test block increases with the increase of carbonation reaction time, and the strength of the test block of alkali leaching is up to 6.5 MPa, which is lower than that of the uncarbonated reaction test. The block strength increases by 80.6%. The results of SEM analysis show that the pore wall structure of the foamed concrete test block changes significantly with the prolongation of the carbonation reaction time. The whole process shows the transformation process of “grain-like compaction and granulation looseness”, which may lead to the compressive strength of the test block. The intrinsic cause of the phenomenon of “first increase and then decrease” occurs with the prolongation of carbonation time. The TGA curve results show that when the test block reaches the highest compressive strength, the CO2 can be fixed at 37 kg per ton of foamed concrete. Under the premise of not reducing the strength of the test block, the CO2 can be fixed at 61 kg per ton of foamed concrete.
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Published: 25 November 2019
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| Fund:This work was financially supported by Shanxi Province Key Research and Development (MC2016-02). |
About author:: Guohong Ren, from September 2016 to July 2019, studied at Shanxi University to study the recycling of solid waste.
Hongqiang Liao, postdoctoral fellow at Tsinghua University, professor-level senior engineer. A well-known expert in the field of energy conservation and environmental protection and solid waste recycling in China. He entered Peking University and Shanxi University to engage in the development and application of new techno-logies for energy conservation, environmental protection and solid waste utilization, took charge of the national “Eleventh Five-Year” science and technology support project, the national “Twelfth Five-Year” technology support project. |
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