Choi Se-Jin, Lee Jae-In, Kim Chae-Young, Yoon Joo-Ho, Kim Kwan-Ho
Department of Architectural Engineering, Wonkwang University, 460 Iksan-daero, Iksan 54538, Republic of Korea.
Materials (Basel). 2024 Nov 8;17(22):5449. doi: 10.3390/ma17225449.
Lightweight aggregate concrete can reduce the self-weight of a structure with a low unit weight; however, disadvantages such as reduced strength and brittleness remain. This study evaluated the thermal and mechanical properties of lightweight aggregate cement mortars containing carbon nanotubes (CNTs) and amorphous metallic fibers (AMFs). A thermal property test indicated that the peak temperature of the C1A1 and C1A2 samples using AMFs was approximately 91.5-93.8 °C (approximately 57.2-61.1% higher than the C1A0 sample without AMFs). The time to reach the peak temperature was approximately 15-27 min (21.1-38.0% of that for the C1A0 sample). The 28-day split tensile strength of the sample using 20 kg/m of the AMFs was approximately 3.6-3.8 MPa (approximately 46.1-50.0% higher than that of CNT-only samples). The 56-day flexural strength of the C2A2 sample using 0.2% CNTs and 20 kg/m AMFs was the highest at approximately 11.2 MPa (approximately 24.4% higher than that of the control sample). The results of this study indicate that using CNTs and AMFs can enhance the strength and reduce the brittleness of lightweight aggregate cement mortar. Furthermore, the performance of the cement mortar is significantly improved when combined with AMFs compared to using CNTs alone.
轻骨料混凝土可降低结构自重，单位重量较低；然而，强度降低和脆性等缺点仍然存在。本研究评估了含有碳纳米管（CNTs）和非晶态金属纤维（AMFs）的轻骨料水泥砂浆的热性能和力学性能。热性能测试表明，使用AMFs的C1A1和C1A2样品的峰值温度约为91.5 - 93.8℃（比不含AMFs的C1A0样品高约57.2 - 61.1%）。达到峰值温度的时间约为15 - 27分钟（为C1A0样品的21.1 - 38.0%）。使用20 kg/m AMFs的样品的28天劈裂抗拉强度约为3.6 - 3.8 MPa（比仅含CNTs的样品高约46.1 - 50.0%）。使用0.2% CNTs和20 kg/m AMFs的C2A2样品的56天抗折强度最高，约为11.2 MPa（比对照样品高约24.4%）。本研究结果表明，使用CNTs和AMFs可提高轻骨料水泥砂浆的强度并降低其脆性。此外，与单独使用CNTs相比，与AMFs结合时水泥砂浆的性能有显著改善。
