Influence of Eco-Friendly Mineral Additives on Early Age Compressive Strength and Temperature Development of High-Performance Concrete

World Multidisciplinary Earth Sciences Symposium 2017

Kaszynska, Maria^1 ; Skibicki, Szymon^1

West Pomeranian University of Technology, Al. Piastów 17, Szczecin

70-310, Poland^1

关键词: Compressive strength of concrete;    Constant temperature;    Early age strengths;    Elevated temperature;    Maximum temperature;    Pozzolanic additives;    Temperature development;    Water/binder ratios;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/4/042060/pdf
DOI  :  10.1088/1755-1315/95/4/042060

来源: IOP

【 摘 要 】

High-performance concrete (HPC) which contains increased amount of both higher grade cement and pozzolanic additives generates more hydration heat than the ordinary concrete. Prolonged periods of elevated temperature influence the rate of hydration process in result affecting the development of early-age strength and subsequent mechanical properties. The purpose of the presented research is to determine the relationship between the kinetics of the heat generation process and the compressive strength of early-age high performance concrete. All mixes were based on the Portland Cement CEM I 52.5 with between 7.5% to 15% of the cement mass replaced by the silica fume or metakaolin. Two characteristic for HPC water/binder ratios of w/b = 0.2 and w/b = 0.3 were chosen. A superplasticizer was used to maintain a 20-50 mm slump. Compressive strength was determined at 8h, 24h, 3, 7 and 28 days on 10x10x10 cm specimens that were cured in a calorimeter in a constant temperature of T = 20°C. The temperature inside the concrete was monitored continuously for 7 days. The study determined that the early-age strength (t