Effect of Bonding Interface Treatment on Bonding Property of Modified Supersulfated Cement Mortar

Peng Du1

Feihan Jia1

Xumin Li1

Wenhui Fang1

Yiming Zhou2

Mohamed Elchalakani2

Pengkun Hou1

Jinbang Wang1,3, Email

Zonghui Zhou1, Email

Xin Cheng1

1Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, Engineering Center of Advanced Building Materials of Ministry of Education, University of Jinan, Jinan 250022, China
2School of Civil, Environmental and Mining Engineering, University of Western Australia, WA 6009, Australia
3Shandong Ecological Environment Research Institute Co. Ltd., Jinan 250022, China

Abstract

Supersulfated cement (SSC) is a kind of sustainable low-carbon, less clinker or no clinker cement, which suitable for use as a low grade concrete pavement repair material and has been widely concerned, but it needs to add a certain amount of alkali to activate its higher early strength. Therein, the bonding properties of SSC mortar modified by sodium silicate and high alkali red mud and its influence factors were studied, and influence mechanism was analyzed by simulating the bonding interface. In order to provide a theoretical basis for the application of SSC as low grade pavement repair material. Results show that the bonding strength between modified SSC repair mortar and the old substrate increased when the roughness of old substrate surface increased. When the load was applied, the stress of the bonding interface was significantly greater than the other specimen position and increase of the roughness was advantageous to the interface stress dispersion. Under the same roughness condition, the surface of the old matrix should not be too dry or wet, because the water migration will occur at the bonding interface, which making the W/C near the interface different from other regions, leading to the increase of micro-cracks at the interface and the decrease of bonding strength.

Effect of Bonding Interface Treatment on Bonding Property of Modified Supersulfated Cement Mortar