Analysis of the Impact of Fly Ashes on the Structure of SCC Concrete Aeration

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

土木建筑工程;文学

Zielinski, Krzysztof^1 ; Witkowski, Pawel^2

Pozna University of Technology, Institute of Structural Engineering, Poland, ul. Piotrowo 5, Pozna

60-965, Poland^1

Lafarge Cement S.A., ul. Dziadoszaska 10, Pozna

61-248, Poland^2

关键词: Air content;    Fresh concrete mixes;    Hardened concrete;    Large amounts;    Physical and mechanical properties;    Pressure methods;    Spacing factor;    Unit prices;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/471/3/032025/pdf
DOI  :  10.1088/1757-899X/471/3/032025

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The paper presents the results of tests of the impact of fly ash admixture on the structure of aeration and on selected physical and mechanical properties of self-compacting concrete (SCC) concrete mix. The effects were compared to those obtained for SCC concrete made solely with the use of Portland cement. Tests were performed on a fresh concrete mix (spread, viscosity and air content by pressure method). The aeration parameters of the fresh concrete mix were determined by Air Void Analyser (AVA) method (total air content A, micropores content A300 and spacing factor L). For hardened concretes, the following characteristics were determined: compressive strength (after 2, 7, 28 and 56 days), water absorption, water tightness and frost resistance. Unit prices were also calculated (for prices in Poland) for SCC concrete made solely with the use of Portland cement and separately with the use of fly ash admixture. The analysis of the results demonstrated that the addition of a large amount of fly ashes to SCC concrete clearly has a negative impact on the stability and quality of its aeration characteristics and, as a consequence, significantly reduces its frost resistance and thus durability. The unit price calculated for SCC concretes made with the use of fly ash is clearly lower than of concretes made solely with the use of Portland cement, but in many cases this does not justify the use of fly ash.