硅烷偶联剂改性钢纤维水泥基复合材料弯曲性能研究

摘要/Abstract

摘要： 通过硅烷偶联剂(SCA)对钢纤维进行表面改性,使用扫描电子显微镜和红外光谱仪对改性后的钢纤维进行微观表征,利用弯曲试验和单纤维拔出试验研究了两种SCA(KH560与KH550)改性钢纤维水泥基复合材料的弯曲性能和单纤维的拉拔性能。结果表明,KH560改性钢纤维能提高水泥基复合材料早期的弯曲强度和韧性、单纤维的峰值黏结应力和拔出功,而在后期,KH560劣化了钢纤维-基体界面,对弯曲性能和单纤维的拉拔性能产生了不利影响。KH550则呈现出与KH560相反的规律。KH550与KH560体积比为5∶5和7∶3的改性组能提高钢纤维水泥基复合材料早期和后期的弯曲性能,并有效改善钢纤维-基体界面黏结性能。复合SCA提高了钢纤维表面的粗糙度,并能在钢纤维-SCA-基体界面实现化学键连接。复合SCA有效提高了钢纤维水泥基复合材料的弯曲强度和韧性。

关键词: 硅烷偶联剂, 钢纤维, 弯曲性能, 界面黏结性能, 单纤维拔出, 改性机理

Abstract: The surface of steel fiber was modified by silane coupling agent (SCA), and the modified fiber was characterized by scanning electron microscopy and fourier transform infrared spectroscopy. The flexural properties and single-fiber pull-out properties of two SCA (KH560 and KH550) modified steel fiber cement-based composites were studied by bending tests and single-fiber pull-out tests. The results show that KH560-modified steel fiber can improve the early flexural strength and toughness of cement-based composites, single-fiber peak bonding stress and single-fiber pull-out energy. However, in later stages, KH560 deteriorates the steel fiber-matrix interface, which has a negative effect on flexural properties and single-fiber pull-out behavior. In contrast, KH550-modified fiber shows the opposite effect to that of KH560. The modified group with volume ratio of KH550 and KH560 of 5∶5 and 7∶3 can improve the early and late bending properties of steel fiber cement-based composites, and effectively improve the bonding performance of steel fiber-matrix interface. The composite SCA improves the roughness of steel fiber surface and facilitates chemical bonding at steel fiber-SCA-matrix interface. The composite SCA effectively improves the flexural strength and toughness of steel fiber cement-based composites.

Key words: silane coupling agent, steel fiber, flexural property, interface adhesion performance, single-fiber pull-out, modification mechanism

中图分类号:

TU528.572

孙庭超, 曾德明, 曹明莉. 硅烷偶联剂改性钢纤维水泥基复合材料弯曲性能研究[J]. 硅酸盐通报, 2023, 42(7): 2326-2335.

SUN Tingchao, ZENG Deming, CAO Mingli. Flexural Properties of Silance Coupling Agents Modified Steel Fiber Cement-Based Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2326-2335.

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