Abstract: The light-transmitting cement-based composites (LTCC) is a green building material that integrates the functions of load-bearing, lighting and decoration. It can be used as a building envelope for wall and floor spaces. However, the fiber diameter has a significant effect on the mechanical properties and light transmission properties of the LTCC. However, the relationship between the fiber diameter and the performance of the LTCC is still lacking in systematic research. In this paper, a fiber with a diameter of 0.25—1.00 mm is used. The influence of its diameter on the mechanical properties, light transmission properties and porosity of the LTCC is systematically studied. The results show that when the pressure load direction is perpendicular to the fiber axis, the compressive strength and flexural strength reach 27.22 MPa and 5.43 MPa respectively when the fiber diameter is 0.25 mm, which is an increase of 9.76% and 18.56% compared to the cement matrix. When the direction of the pressure load is parallel to the axial direction of the fiber, the compressive strength and flexural strength reach 30.33 MPa and 2.37 MPa respectively when the fiber diameter is 0.25 mm, which are 22.30% higher and 48.25% lower than that of the cement matrix. The fiber/cement matrix interface effectively hinders the propagation of cracks during fracture and improves the strength of the cement-based composite material, and the smaller the fiber diameter, the more significant the enhancement effect. After the fiber is incorporated, the cement-based composite material becomes an anisotropic material, and the direction of the applied load has a significant effect on its flexural strength. When the load direction is perpendicular to the axial direction of the optical fiber, the incorporation of the optical fiber mainly plays a role of toughening and strengthening, and the flexural strength is improved; when it is parallel to the axial direction of the optical fiber, the interface effectively promotes cracks, then reduces the flexu-ral strength. The light transmittance of the LTCC is less than the theoretical value (1.0%) at 400—800 nm. The inherent loss and interface scatte-ring in the transmission process of light PMMA fiber are important reasons that affect the light transmittance of the composite material.
1 Li Y, Li J Q, Wan Y H, et al. Construction & Building Materials, 2015,96(15),319. 2 Mainini A G, Poli T, Zinzi M, et al. Energy Procedia,2014, 48,1292. 3 Chen Y. Research on the application of transparent concrete materials in architectural design. Master's Thesis, Nanjing University, China, 2011 (in Chinese). 陈瑶. 透明混凝土材料在建筑设计中的应用研究. 硕士学位论文, 南京大学, 2011. 4 Wu Y H. Research on intelligent transparent concrete products and their properties. Master's Thesis, Harbin Institute of Technology, China, 2010 (in Chinese). 吴源华. 智能透明混凝土制品及其性能研究. 硕士学位论文, 哈尔滨工业大学, 2010. 5 Li Y, Xu Z Y. Concrete,2013(4),141(in Chinese). 李悦, 许志远. 混凝土,2013(4),141. 6 Salih S A, Joni H H, Mohamed S A. Engineering and Technology Journal, 2014, 32,2846. 7 Li L, Cai L, Chen H, et al.Tile, 2016(11),62 (in Chinese). 李良, 蔡林, 陈昊,等.砖瓦, 2016(11),62. 8 Zhou Z, Shen J, Jiao S Y, et al.Functional Materials,2016(47),12007 (in Chinese). 周智, 申娟, 焦思雨,等. 功能材料, 2016(47), 12007. 9 Li V C, Maalej M.Cement and Concrete Composites, 1996,18(4), 239. 10 Divanedari H, Eskandari-Naddaf H. Construction and Building Materials, 2020,233,117207. 11 Liu J, Jia Y, Wang J.Fibers and Polymers,2019, 20(9), 1900. 12 Lemeshev D O, Makarov N A, Ikonnikov K I. Glass & Ceramics,2012, 69(5-6), 178. 13 Henriques T D S, Dal Molin D C, Masuero B. Construction and Buil-ding Materials, 2018, 161,305.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2021, Vol. 35 
