| 环氧树脂-混凝土的早龄期压缩性能 |
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| 引用本文： | 黄钰桐,马东鹏,廖雨田,刘逸平,蒋震宇,汤立群. 环氧树脂-混凝土的早龄期压缩性能[J]. 复合材料学报, 2019, 36(12): 2735-2744. DOI: 10.13801/j.cnki.fhclxb.20190729.003 |
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| 作者姓名： | 黄钰桐 马东鹏 廖雨田 刘逸平 蒋震宇 汤立群 |
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| 作者单位： | 华南理工大学 土木与交通学院, 广州 510641 |
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| 基金项目： | 国家自然科学基金（11772132；11772131；11772134） |
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| 摘 要： | 环氧树脂-混凝土是混合环氧树脂、固化剂和骨料后养护成型的一种新型聚合物混凝土，早期强度增长快是其优异性能之一。本文通过对不同养护龄期的环氧树脂-混凝土进行单轴压缩试验，研究其早龄期压缩性能。试验结果表明，在养护龄期的最初24 h内环氧树脂-混凝土压缩强度迅速增大，养护24 h的压缩强度达50.3 MPa。基于环氧树脂-混凝土的强度增长机制和养护72 h后压缩强度趋于稳定的现象，建立了一种基于环氧树脂n级固化反应的环氧树脂-混凝土早龄期压缩强度预测模型，该模型比普通水泥混凝土经典的CEB-FIP、ACI 209强度预测模型具有更好的预测效果。基于压缩强度预测和实验结果，建立了考虑龄期的环氧树脂-混凝土单轴压缩本构模型，该模型能较好地预测环氧树脂-混凝土早龄期压缩应力-应变关系。
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| 关 键 词： | 环氧树脂-混凝土 早龄期 单轴压缩 本构模型 压缩强度 n级固化模型 |
| 收稿时间： | 2019-04-26 |
Compressive properties of epoxy resin-concrete at early-age |
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| Affiliation: | School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China |
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| Abstract: | Epoxy resin-concrete is a new type of polymer concrete prepared by mixing epoxy resin, curing agent and aggregate. Fast growth of early strength is one of its excellent properties. In this paper, the uniaxial compression tests of epoxy resin-concrete at different ages were carried out to study the early compressive performance of epoxy resin-concrete. Test results show that the compressive strength of epoxy resin-concrete increases rapidly during the first 24 h curing age, and the compressive strength after curing 24 h can achieve 50.3 MPa. Considering the strength growth mechanism of epoxy resin-concrete and the stability of compressive strength after curing 72 h, a prediction model of early compressive strength of epoxy resin-concrete based on a nth order curing model for epoxy resin was established. The model has better prediction results compared with the classic CEB-FIP and ACI 209 models forconventional cement concrete. Based on the prediction model and experimental results of compressive strength, a uniaxial compression constitutive model of epoxy resin-concrete was established. This model can predict the compressive stress-strain relationship of epoxy resin-concrete at early-age. |
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