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| 工程水泥基复合材料自愈合过程与产物 | |
| 引用本文： | 阚黎黎,施惠生,瞿广飞,宁平. 工程水泥基复合材料自愈合过程与产物[J]. 同济大学学报(自然科学版), 2011, 39(10): 1517-1523. DOI: 10.3969/j.issn.0253-374x.2011.10.019 |
| 作者姓名： | 阚黎黎 施惠生 瞿广飞 宁平 |
| 作者单位： | 1. 同济大学先进土木工程材料教育部重点实验室,上海 200092;昆明理工大学环境科学与工程学院,云南昆明 650093 2. 同济大学先进土木工程材料教育部重点实验室,上海,200092 3. 昆明理工大学环境科学与工程学院,云南昆明,650093 |
| 基金项目： | 美国国家自然科学基金项目（CMMI 0700219） |
| 摘 要： | 借助环境扫描电镜(ESEM)对纤维表面以及15,30,50μm不同宽度裂缝自愈合产物的生长过程进行了连续观察,结合EDS(energy dispersive spectroscopy)、TEM(transmission electron microscopy,透射电镜)、XRD(X-raydiffraction)及FTIR(fourier transform infrared spectroscopy)等先进研究手段,对工程水泥基复合材料(ECC)裂缝自愈合产物的化学特性进行了分析.结果表明,体系中水泥基材料的进一步水化及C-S-H凝胶和CaCO3晶体的生成是裂缝自愈合的主要原因.宽度15μm裂缝的自愈合产物主要为C-S-H凝胶;宽度30μm裂缝的自愈合产物主要为C-S-H凝胶和CaCO3;观察周期内,宽度50μm形成的自愈合产物量无法填满裂缝.从微观层次上看,宽度30μm以下的裂缝几乎都能完全自愈合.同时,ECC材料中的PVA(聚乙烯醇)纤维有亲水特性,为自愈合产物的形成提供了成核点,有助于ECC材料自愈合产物的形成和生长. |
| 关 键 词： | 工程水泥基复合材料 自愈合 过程 产物 |
| 收稿时间： | 2010-07-06 |
| 修稿时间： | 2011-07-11 |
Self healing Processes and Products of Engineered Cementitious Composites Materials |
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| KAN Lili,SHI Huisheng,QU Guangfei and NING Ping. Self healing Processes and Products of Engineered Cementitious Composites Materials[J]. Journal of Tongji University(Natural Science), 2011, 39(10): 1517-1523. DOI: 10.3969/j.issn.0253-374x.2011.10.019 | |
| Authors: | KAN Lili SHI Huisheng QU Guangfei NING Ping |
| Affiliation: | Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education,Tongji University,Shanghai 200092,China;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education,Tongji University,Shanghai 200092,China;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China |
| Abstract: | The growth processes of self-healing products on 15 μm,30 μm,and 50 μm cracks as well as on fiber surfaces were displayed by means of ESEM.The chemical characterizations of healing products were reported by applying many advanced research technologies such as EDS,TEM,XRD and FTIR.These results suggest that further hydration of cementitious materials and the formation of C-S-H gel and CaCO3 crystals are the main reasons for the self-healing phenomena.C-S-H is the main self-healing product for crack widths of 15 μm,and C-S-H and CaCO3are the main self-healing products for crack widths of 30 μm.Self-healing products couldn’t fill in the crack widths of 50 μm within observation period.At the micro-level,cracks below 30 μm in width can be almost totally healed.Meanwhile,PVA fibers with hydrophilic nature in ECC provide nucleation sites for healing products that may aid in the self-healing of ECC. |
| Keywords: | engineered cementitious composites(ECC) self-healing process product |
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