Wang Dawei, Liu Runqing, Wang Song, Ma Xin
School of Materials Science and Engineering, Shenyang Ligong University, Shenyang 110159, China.
Materials (Basel). 2024 Aug 14;17(16):4037. doi: 10.3390/ma17164037.
Amorphous alloy fiber has the advantages of high tensile strength and high corrosion resistance compared with steel fiber, but its interfacial bonding with cement matrix is poor and requires surface modification treatment. In this study, the surface modification of amorphous alloy fiber was carried out by using silane coupling agent KH-550 solution, and its effect on the mechanical properties of ultra-high-performance concrete was investigated. The results showed that the amorphous alloy fibers modified with 15% concentration silane coupling agent KH-550 solution can effectively improve the mechanical properties of the ultra-high-performance concrete, where the interfacial bond strength with the cement matrix reached 3.29 MPa and the roughness reached 3.85. The compressive strength, flexural strength, tensile strength, and peak stress of the ultra-high-performance concrete mixed with modified amorphous alloy fibers could reach up to 133.6 MPa, 25.5 MPa, 8.32 MPa, and 114.26 MPa, respectively, which were 2.9%, 6.3%, 10.9%, and 4.3% higher than those of the ultra-high-performance concrete with unmodified amorphous alloy fibers. As the surface of the fiber was modified, its properties changed and the bonding effect with the cement matrix was better, which in turn improved the mechanical properties of the ultra-high-performance concrete.
与钢纤维相比，非晶合金纤维具有抗拉强度高和耐腐蚀性强的优点，但其与水泥基体的界面粘结性较差，需要进行表面改性处理。本研究采用硅烷偶联剂KH-550溶液对非晶合金纤维进行表面改性，并研究其对超高性能混凝土力学性能的影响。结果表明，用浓度为15%的硅烷偶联剂KH-550溶液改性的非晶合金纤维能有效提高超高性能混凝土的力学性能，其与水泥基体的界面粘结强度达到3.29MPa，粗糙度达到3.85。掺加改性非晶合金纤维的超高性能混凝土的抗压强度、抗折强度、抗拉强度和峰值应力分别可达133.6MPa、25.5MPa、8.32MPa和114.26MPa，分别比未改性非晶合金纤维的超高性能混凝土提高了2.9%、6.3%、10.9%和4.3%。由于纤维表面得到改性，其性能发生变化，与水泥基体的粘结效果更好，进而提高了超高性能混凝土的力学性能。
