玻璃纤维-水泥浆界面区微观结构对GFRC复合材料长期耐久性的意义

"SP-126: Durability of Concrete: Second International Conference, Montreal, Canada 1991" Pub Date : 1991-08-01 DOI:10.14359/2388

M. Kawamura, S. Igarashi

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引用次数: 0

摘要

对预拌法生产的玻璃纤维增强砂浆和混凝土的长期耐久性进行了研究。在水泥浆体中嵌入玻璃纤维束周围区域进行了显微硬度测量和定量背散射电子图像(BSE)分析。讨论了GFR砂浆抗弯强度和韧性随龄期的变化与界面区微观结构特征的关系。GFR砂浆的韧性随龄期的增加而降低，这是由于紧靠钢绞线附近和距界面70 ~ 100微米处的显微硬度增加所致。在距界面70 ~ 100微米处的凝固以及玻璃丝间隙水化产物的形成与GFRC复合材料韧性的降低有关。

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Significance of Microstructure of the Glass Fiber-Cement Paste Interfacial Zone in Long-Term Durability of GFRC Composites

The long-term durability of glass fiber reinforced (GRF) mortars and concretes manufactured by the pre-mixing method was investigated. Microhardness measurements and the quantitative back scattered electron image (BSE) analysis were made in the regions around glass fiber strands embedded in the cement paste. Changes of flexural strength and toughness in the GFR mortars with age were discussed being related to the features of microstructure in the interfacial regions. The toughness of the GFR mortars decreased with age n response to the increase in microhardness at the immediate vicinity of strands and around 70-100 micrometers from the interface. The solidification in the regions around 70-100 micrometes from interface as well as the formation of the hydration products in the spaces among the glass filaments appear to relate to reduction in toughness in GFRC composites.

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"SP-126: Durability of Concrete: Second International Conference, Montreal, Canada 1991"

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