Resistance to Internal Damage and Scaling of Concrete Air Entrained By Microspheres

World Multidisciplinary Civil Engineering-Architecture-Urban Planning Symposium - WMCAUS

土木建筑工程

Molendowska, Agnieszka^1 ; Wawrzenczyk, Jerzy^1

Kielce University of Technology, Al. Tysiclecia Pastwa Polskiego 7, Kielce

25-314, Poland^1

关键词: Air void structure;    Freeze-thaw durability;    High strength concretes;    Internal cracking;    Internal damages;    Microsphere sizes;    Polymer microspheres;    Scaling resistance;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/245/2/022046/pdf
DOI  :  10.1088/1757-899X/245/2/022046

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

This paper report the test results of high strength concrete produced with slag cement and air entrained with polymer microspheres in three diameters. The study focused on determining the effects of the microsphere size and quantity on the air void structure and resistance to internal cracking and scaling of the concrete. The resistance to internal cracking was determined in compliance with the requirements of the modified ASTM C666 A method on beam specimens. The scaling resistance in a 3% NaCl solution was determined using the slab test in accordance with PKN-CEN/TS 12390-9:2007. The air void structure parameters were determined to PN-EN 480-11:1998. The study results indicate that the use of microspheres is an effective air entrainment method providing very good air void structure parameters. The results show high freeze-thaw durability of polymer microsphere-based concrete in exposure class XF3. The scaling resistance test confirms that it is substantially more difficult to protect concrete against scaling in the presence of the 3% NaCl solution (exposure class XF4). Concrete scaling is a complex phenomenon controlled by a number of independent factors.