Plasticizer and Superplasticizer Compatibility with Cement with Synthetic and Natural Air-Entraining Admixtures

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

土木建筑工程

laniewska-Piekarczyk, Beata^1 ; Miera, Patrycja^1 ; Szwabowski, Janusz^1

Silesian University of Technology, Akademicka 5 str., Gliwice

44-100, Poland^1

关键词: Air content of concrete;    Air entraining admixtures;    Air-entrained concrete;    Cementitious;    Different effects;    Multicomponents;    Natural air;    Superplasticizers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/245/3/032094/pdf
DOI  :  10.1088/1757-899X/245/3/032094

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

When increasing the degree of fluidity of previously aerated cementitious mixtures, there is a problem of maintaining their correct aeration. Most of the available superplasticizers cause a significant increase of the air content of concrete mixtures. The problem of compatibility of superplasticizer and air-entraining admixture increases in case of multicomponent Portland cement, due to different effects of these additives. It comes down to achieving a compatibility of the three variables mentioned in the title of the paper, due to the required air entrainment and consistency of mixture. Achieving compatibility of such a system requires a series of experimental studies that were presented in the paper together with their resulting indications. In case of previously air-entrained concrete that is made with an air-entraining cement, after the addition of new generation SP occurs very large increase in air entrainment. The air-content of mixture according to EN 480-1 may be higher than 13%.