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| Study on Preparation and Properties of Lime Mud Mixed Concrete |
| Received:January 20, 2025 Revised:February 17, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.08.018 |
| Key Words:lime mud compressive strength chloride penetration resistance carbonization resistance solid waste |
| Fund Project:广西重点研发计划项目（AB24010079）；中央引导地方专项（ZY21195043）；中建八局科技研发项目。 |
| Author Name | Affiliation | Postcode | | WEN Hongyu* | Logistics and Infrastructure Department, Guangxi University, Nanning, Guangxi Zhuang Autonomous Region,530004 | 530004 | | PENG Yangfan | College of Civil Engineering, Key Lab of Disaster Prevention and Mitigation and Engineering Safety, Key Lab of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi Zhuang Autonomous Region, 530004 | 530004 | | LIANG Dongjing | China Construction Eighth Engineering Division Co., Ltd., Shanghai, 200122 | 200122 | | HE Sheng* | College of Civil Engineering, Key Lab of Disaster Prevention and Mitigation and Engineering Safety, Key Lab of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning, Guangxi Zhuang Autonomous Region, 530004
Guangxi Bossco Environmental Protection Technology Co., Ltd., Nanning, Guangxi Zhuang Autonomous Region, 530007 | 530007 |
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| Abstract:Lime mud and fly ash were used to replace ordinary portland cement to prepare concrete. According to the chemical composition and physicochemical characteristics of lime mud， planetary ball mill was used to change the particle size and surface area of lime mud， and the prediction model of concrete cube compressive strength under different ages and lime mud content was established. The variation rule of mechanical properties and durability of lime mud concrete under single addition and binary addition with fly ash was studied， and the influence of the amount of lime mud on the compressive strength， chloride ion penetration resistance and carbonization resistance of concrete， and explored the synergistic effect of lime mud and fly ash were analyzed by analyzing the hydration products under the microscopic morphology. The results showed that the early strength of the lime mud concrete mixed with less than 10% was higher than that of ordinary portland cement. When the addition amount was 20%， the lime mud concrete mixed with the concrete had a micro crystallinity effect. As the content of lime mud increased， the microstructure of hydration products of concrete became loose easily. Under the synergistic action of lime mud and fly ash， the compressive strength of concrete under binary addition of lime mud and fly ash （L5F15） could reach 50.47 MPa at 84 days ages， which was 12.7% higher than that under single addition （L20）， and the micro-pores of the cementitious system are obviously reduced. The addition of fly ash could improve the chloride penetration resistance and carbonization resistance of lime mud concrete. The practical prediction model of carbonation depth of lime mud concrete was established， and the correlation was significant. |
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