Microstructure and Mechanical Properties of a Steel _ Cement Mortar Interface Zone in Concrete Modified with Mineral Additives and Chemical Admixtures

3rd World Multidisciplinary Civil Engineering, Architecture, Urban Planning Symposium

土木建筑工程;文学

Jasiczak, Jozef^1 ; Januszewski, Mariusz^2

Institute of Structural Engineering, Poznan University of Technology, Piotrowo 5, Poznan

60-965, Poland^1

Division of Civil Engineering and Building Materials, Koszalin University of Technology, Sniadeckich 2, Koszalin

75-453, Poland^2

关键词: Chemical admixture;    Contemporary models;    Crystalline phase;    Microstructure and mechanical properties;    Mineral additives;    Nitrogen atmospheres;    Scanning microscope;    Technical literature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/471/2/022039/pdf
DOI  :  10.1088/1757-899X/471/2/022039

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The Zimbelmann's model presenting the interface layer of aggregate and cement paste is often published in technical literature. It is also known as the border zone of steel fibre and cement concrete presented by A. Bentur, S. Diamond, S. Mindess in 1985, and W. Kurdowski in 1991.The authors of this article have conducted a wide range of research regarding the contact layer of steel and cement mortar in reinforced concrete. Fifteen composition variants with various cements have been analysed, including those modified with additives and chemical admixtures. Adhesive forces of mortar to steel, as well as the contact microstructure have been specified. The microstructure was tested on specially prepared samples made of steel pipes filled with cement mortar. Fractures of the samples were prepared in a liquid nitrogen atmosphere and the contact of steel and paste was estimated under a scanning microscope at a magnification of 1000-10000. A contemporary model of cement interface was developed, consisting of a preliminary phase of CSH, crystalline phase of Ca (OH)2 and ettringite phase. The pull on strength, thickness of CSH layer and its porosity depend on the composition of cement in a specific phase and the use of w/c additives and admixtures.