| 摘要: |
| 采用高吸水性树脂（SAP）作为混凝土内养护材料，通过纳米压痕试验，研究了养护龄期和SAP掺量对内养护混凝土孔洞界面微观力学的影响，借助扫描电镜与能谱分析（SEM-EDS）表征混凝土的内部物相及化学组成.结果表明：随着养护龄期的增加，SAP释水界面的弹性模量和硬度提高；掺入SAP后，混凝土中的水化产物分布更加均匀；随着养护龄期的增加，水化产物含量逐渐增大，界面更加致密；SEM-EDS测试结果与力学性能相吻合，说明SAP对高强混凝土具有积极影响. |
| 关键词: 高强混凝土 内养护 高吸水性树脂 微观特征 纳米压痕 SEM-EDS |
| DOI：10.3969/j.issn.1007-9629.2023.07.001 |
| 分类号:TU528.31 |
| 基金项目:国家自然科学基金资助项目（52109154）；河南省自然科学基金资助项目（202300410270） |
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| Microscopic Quantitative Characterization and Analysis of Internal Curing Effect of High Strength Concrete |
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GUO Lixia1,2,3, WU Zheng1, ZHONG Ling1,2,3, ZHANG Fangfang1, LUO Yun4
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1.School of Water Conservancy， North China University of Water Resources and Electric Power， Zhengzhou 450046， China;2.Henan Water Valley Research Institute， Zhengzhou 450046， China;3.Henan Key Laboratory of Water Environment Simulation and Treatment， North China University of Water Resources and Electric Power， Zhengzhou 450002， China;4.Xinyang Hydrological and Water Resources Survey Bureau of Henan Province， Xinyang 464000， China
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| Abstract: |
| Super absorbent polymer （SAP） was used as the internal curing material for concrete. Through the nanoindentation test， the effects of curing age and SAP content on the micromechanics of the cavity interface of the internally cured concrete were studied， and the internal phase and chemical composition of the concrete were characterized by scanning electron microscope and energy dispersive spectroscopy （SEM-EDS）. The results show that the elastic modulus and hardness of the SAP water release interface increase with the increase of curing age. After adding SAP， the distribution of hydration products in concrete becomes more uniform. As the curing age increases， the content of hydration products gradually increases， and the interface becomes denser. The SEM-EDS test results are consistent with the test of mechanical properties， indicating that SAP has a positive impact on high-strength concrete. |
| Key words: high strength concrete internal curing super absorbent polymer（SAP） microscopic feature nanoindentation SEM-EDS |
