Author:
Yuan Chengbin,Cai Yu,Gu Qiang,Sang Di
Abstract
AbstractIn order to improve the construction technology level of the connection nodes of prefabricated buildings and improve the mechanical properties, fluidity and economy of the connection mortar, this paper adopts the orthogonal experimental design to improve the cement mortar by adding polymer dispersible polymer powder. A modified high-performance mortar with 1d compressive strength of 11Mpa, 3d compressive strength of 19Mpa, 7d compressive strength of 26Mpa, fluidity of 102 mm and final compressive strength higher than M25 was studied. The factors and levels of the orthogonal test are: mortar ratio 1:3,1:4,1:5; silica powder content of 4%,6%,8%; dispersible polymer powder content of 3%,5%,7%. After research, the optimal mixing ratio of modified high-performance mortar is 1:3, the content of silicon powder is 6%, the content of redispersible latex powder is 3%, the content of early strength water reducing agent is 0.1%, and the content of defoamer is 0.5%. The new modified high-performance cement mortar is characterized by short setting time and high early strength, which provides a new idea for the connecting materials of prefabricated buildings, which is of great significance for improving the integrity of prefabricated buildings and the durability of the connection.
Funder
Jiangsu Provincial Department of water resources
Publisher
Springer Science and Business Media LLC
Subject
Ocean Engineering,Civil and Structural Engineering
Reference28 articles.
1. Bhanja, S., & Sengupta, B. (2003). Modified water–cement ratio law for silica fume concretes. Cement and Concrete Research, 33(3), 447–450.
2. Bhikshma, V., Nitturkar, K., & Venkatesham, Y. (2009). Investigations on mechanical properties of high strength silica fume concrete. Asian Journal of Civil Engineering, 10, 335–346.
3. Cai, Z. and Wang, Z. (1985). Application of orthogonal design in concrete, China Construction Industry Press.
4. Choi, J. Y., Joo, M.-K., & Lho, B. C. (2016). Effects of silica fume content and polymer-binder ratio on properties of ultrarapid-hardening polymer-modified mortars. International Journal of Concrete Structures and Materials, 10(2), 249–256.
5. Do, Jeongyun and Kim, Dookie. (2008). Feasibility study on the utilization as repair grouting of high flowable polymer-modified cement mortar, adding high volume polyacrylic ester (PAE). Journal of Asian Architecture and Building Engineering, 7, 363–370.